TP-AGB stars and stellar population properties of a post-starburst galaxy at z ∼ 2 through optical and near-infrared spectroscopy with JWST

Astronomy & Astrophysics EDP Sciences 699 (2025) a203

Authors:

Davide Bevacqua, Paolo Saracco, Francesco La Barbera, Guido De Marchi, Roberto De Propris, Fabio R Ditrani, Anna R Gallazzi, Giovanna Giardino, Danilo Marchesini, Anna Pasquali, Tim D Rawle, Chiara Spiniello, Alexandre Vazdekis, Stefano Zibetti

Abstract:

We present a detailed optical and near-IR (NIR) spectral analysis of J-138717, a post-starburst galaxy at z = 1.8845 observed with JWST/NIRSpec, for which we derive a stellar mass of 3.5±0.2×10 10 M ⊙ and a stellar velocity dispersion of 198±10 km s −1 . We estimate an age of ∼0.9 Gyr and a subsolar metallicity (between −0.4 and −0.2 dex). We find generally consistent results when we fit the optical and NIR wavelength ranges separately or with different model libraries. The reconstruction of the star formation history indicates that the galaxy assembled most of its mass quickly and then quenched rapidly, ∼0.4 Gyr before the observation. Line diagnostics suggest that the weak emission is probably powered by residual star formation (star formation rate ∼0.2 M ⊙ yr −1 ) or a low-luminosity active galactic nucleus, without strong evidence for outflows in ionized or neutral gas. We performed a detailed study of the NIR spectral indices by comparing observations with predictions of several current stellar population models. This is unprecedented at this high redshift. In particular, the analysis of several CO and CN features argues against a strong contribution of thermally pulsating (TP) asymptotic giant branch (AGB) stars. The observations agree better with models that include very little contribution from TP-AGB stars, but they are also consistent with a mild contribution from TP-AGB stars when a younger age, consistent with the fits, is assumed. The analysis of other NIR spectral indices shows that current models struggle to reproduce the observations. This highlights the need for improved stellar population models in the NIR, especially at young ages and low metallicities. This is most relevant for studying high-redshift galaxies in the era of the JWST.

Galaxy Zoo CEERS: Bar Fractions Up to z ∼ 4.0

The Astrophysical Journal American Astronomical Society 987:1 (2025) 74

Authors:

Tobias Géron, RJ Smethurst, Hugh Dickinson, LF Fortson, Izzy L Garland, Sandor Kruk, Chris Lintott, Jason Shingirai Makechemu, Kameswara Bharadwaj Mantha, Karen L Masters, David O’Ryan, Hayley Roberts, BD Simmons, Mike Walmsley, Antonello Calabrò, Rimpei Chiba, Luca Costantin, Maria R Drout, Francesca Fragkoudi, Yuchen Guo, BW Holwerda, Shardha Jogee, Anton M Koekemoer, Ray A Lucas

Abstract:

We study the evolution of the bar fraction in disk galaxies between 0.5 < z < 4.0 using multiband colored images from JWST Cosmic Evolution Early Release Science Survey (CEERS). These images were classified by citizen scientists in a new phase of the Galaxy Zoo (GZ) project called GZ CEERS. Citizen scientists were asked whether a strong or weak bar was visible in the host galaxy. After considering multiple corrections for observational biases, we find that the bar fraction decreases with redshift in our volume-limited sample (n = 398); from 25−4+6 % at 0.5 < z < 1.0 to 3−1+6 % at 3.0 < z < 4.0. However, we argue it is appropriate to interpret these fractions as lower limits. Disentangling real changes in the bar fraction from detection biases remains challenging. Nevertheless, we find a significant number of bars up to z = 2.5. This implies that disks are dynamically cool or baryon dominated, enabling them to host bars. This also suggests that bar-driven secular evolution likely plays an important role at higher redshifts. When we distinguish between strong and weak bars, we find that the weak bar fraction decreases with increasing redshift. In contrast, the strong bar fraction is constant between 0.5 < z < 2.5. This implies that the strong bars found in this work are robust long-lived structures, unless the rate of bar destruction is similar to the rate of bar formation. Finally, our results are consistent with disk instabilities being the dominant mode of bar formation at lower redshifts, while bar formation through interactions and mergers is more common at higher redshifts.

Improved reconstruction of highly boosted τ-lepton pairs in the ττ→(μνμντ)(hadrons+ντ) decay channels with the ATLAS detector

European Physical Journal C Springer Nature 85:6 (2025) 706

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, A Aggarwal, C Agheorghiesei, F Ahmadov, S Ahuja, X Ai, G Aielli, A Aikot, M Ait Tamlihat, B Aitbenchikh, M Akbiyik, TPA Åkesson, AV Akimov, D Akiyama, NN Akolkar, S Aktas, GL Alberghi, J Albert, P Albicocco, GL Albouy, S Alderweireldt, ZL Alegria, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, F Alfonsi, M Algren, M Alhroob, B Ali, HMJ Ali, S Ali, SW Alibocus, M Aliev, G Alimonti, W Alkakhi, C Allaire, BMM Allbrooke, JS Allen, JF Allen, CA Allendes Flores, PP Allport, A Aloisio, F Alonso, C Alpigiani, ZMK Alsolami, A Alvarez Fernandez, M Alves Cardoso, MG Alviggi, M Aly, Y Amaral Coutinho, A Ambler, C Amelung, M Amerl, CG Ames, D Amidei, B Amini, K Amirie, A Amirkhanov, SP Amor Dos Santos, KR Amos, D Amperiadou, S An, V Ananiev, C Anastopoulos, T Andeen, JK Anders, AC Anderson, A Andreazza, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, E Antipov, M Antonelli, F Anulli, M Aoki, T Aoki, MA Aparo, L Aperio Bella, C Appelt, A Apyan, SJ Arbiol Val, C Arcangeletti, ATH Arce, J-F Arguin, S Argyropoulos, J-H Arling, O Arnaez, H Arnold, G Artoni, H Asada, K Asai, S Asai, NA Asbah, RA Ashby Pickering, AM Aslam, K Assamagan, R Astalos, KSV Astrand, S Atashi, RJ Atkin, H Atmani, PA Atmasiddha, K Augsten, AD Auriol, VA Austrup, G Avolio, K Axiotis, G Azuelos, D Babal, H Bachacou, K Bachas, A Bachiu, E Bachmann, A Badea, TM Baer, P Bagnaia, M Bahmani, D Bahner, K Bai, JT Baines, L Baines, OK Baker, E Bakos, D Bakshi Gupta, LE Balabram Filho, V Balakrishnan, R Balasubramanian, EM Baldin, P Balek, E Ballabene, F Balli, LM Baltes, WK Balunas, J Balz, I Bamwidhi, E Banas, M Bandieramonte, A Bandyopadhyay, S Bansal, L Barak, M Barakat, EL Barberio, D Barberis, M Barbero, MZ Barel, T Barillari, M-S Barisits, T Barklow, P Baron, DA Baron Moreno, A Baroncelli, AJ Barr, JD Barr, F Barreiro, J Barreiro Guimarães da Costa, MG Barros Teixeira, S Barsov, F Bartels, R Bartoldus, AE Barton, P Bartos, A Basan, M Baselga, S Bashiri, A Bassalat, MJ Basso, S Bataju, R Bate, RL Bates, S Batlamous, M Battaglia, D Battulga, M Bauce, M Bauer, P Bauer, LT Bazzano Hurrell, JB Beacham, T Beau, JY Beaucamp, PH Beauchemin, P Bechtle, HP Beck, K Becker, AJ Beddall, VA Bednyakov, CP Bee, LJ Beemster, M Begalli, M Begel, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, P Bellos, K Beloborodov, D Benchekroun, F Bendebba, Y Benhammou, KC Benkendorfer, L Beresford, M Beretta, E Bergeaas Kuutmann, N Berger, B Bergmann, J Beringer, G Bernardi, C Bernius, FU Bernlochner, F Bernon, A Berrocal Guardia, T Berry, P Berta, A Berthold, S Bethke, A Betti, AJ Bevan, NK Bhalla, S Bharthuar, S Bhatta, DS Bhattacharya, P Bhattarai, ZM Bhatti, KD Bhide, VS Bhopatkar, RM Bianchi, G Bianco, O Biebel, M Biglietti, CS Billingsley, Y Bimgdi, M Bindi, A Bingham, A Bingul, C Bini, GA Bird, M Birman, M Biros, S Biryukov, T Bisanz, E Bisceglie, JP Biswal, D Biswas, I Bloch, A Blue, U Blumenschein, J Blumenthal, VS Bobrovnikov, M Boehler, B Boehm, D Bogavac, AG Bogdanchikov, LS Boggia, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, M Boonekamp, AG Borbély, IS Bordulev, G Borissov, D Bortoletto, D Boscherini, M Bosman, K Bouaouda, N Bouchhar, L Boudet, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, IR Boyko, L Bozianu, J Bracinik, N Brahimi, G Brandt, O Brandt, B Brau, JE Brau, R Brener, L Brenner, R Brenner, S Bressler, G Brianti, D Britton, D Britzger, I Brock, R Brock, G Brooijmans, AJ Brooks, EM Brooks, E Brost, LM Brown, LE Bruce, TL Bruckler, PA Bruckman de Renstrom, B Brüers, A Bruni, G Bruni, D Brunner, M Bruschi, N Bruscino, T Buanes, Q Buat, D Buchin, AG Buckley, O Bulekov, BA Bullard, S Burdin, CD Burgard, AM Burger, B Burghgrave, O Burlayenko, J Burleson, JTP Burr, JC Burzynski, EL Busch, V Büscher, PJ Bussey, JM Butler, CM Buttar, JM Butterworth, W Buttinger, CJ Buxo Vazquez, AR Buzykaev, S Cabrera Urbán, L Cadamuro, D Caforio, H Cai, Y Cai, Y Cai, VMM Cairo, O Cakir, N Calace, P Calafiura, G Calderini, P Calfayan, G Callea, LP Caloba, D Calvet, S Calvet, R Camacho Toro, S Camarda, D Camarero Munoz, P Camarri, MT Camerlingo, D Cameron, C Camincher, M Campanelli, A Camplani, V Canale, AC Canbay, E Canonero, J Cantero, Y Cao, F Capocasa, M Capua, A Carbone, R Cardarelli, JCJ Cardenas, MP Cardiff, G Carducci, T Carli, G Carlino, JI Carlotto, BT Carlson, EM Carlson, J Carmignani, L Carminati, A Carnelli, M Carnesale, S Caron, E Carquin, IB Carr, S Carrá, G Carratta, AM Carroll, MP Casado, M Caspar, FL Castillo, L Castillo Garcia, V Castillo Gimenez, NF Castro, A Catinaccio, JR Catmore, T Cavaliere, V Cavaliere, LJ Caviedes Betancourt, YC Cekmecelioglu, E Celebi, S Cella, V Cepaitis, K Cerny, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, B Cervato, A Cervelli, G Cesarini, SA Cetin, PM Chabrillat, J Chan, WY Chan, JD Chapman, E Chapon, B Chargeishvili, DG Charlton, C Chauhan, Y Che, S Chekanov, SV Chekulaev, GA Chelkov, B Chen, B Chen, H Chen, H Chen, J Chen, J Chen, M Chen, S Chen, SJ Chen, X Chen, X Chen, Y Chen, CL Cheng, HC Cheng, S Cheong, A Cheplakov, E Cheremushkina, E Cherepanova, R Cherkaoui El Moursli, E Cheu, K Cheung, L Chevalier, V Chiarella, G Chiarelli, N Chiedde, G Chiodini, AS Chisholm, A Chitan, M Chitishvili, MV Chizhov, K Choi, Y Chou, EYS Chow, KL Chu, MC Chu, X Chu, Z Chubinidze, J Chudoba, JJ Chwastowski, D Cieri, KM Ciesla, V Cindro, A Ciocio, F Cirotto, ZH Citron, M Citterio, DA Ciubotaru, A Clark, PJ Clark, N Clarke Hall, C Clarry, SE Clawson, C Clement, Y Coadou, M Cobal, A Coccaro, RF Coelho Barrue, R Coelho Lopes De Sa, S Coelli, LS Colangeli, B Cole, J Collot, P Conde Muiño, MP Connell, SH Connell, EI Conroy, F Conventi, HG Cooke, AM Cooper-Sarkar, FA Corchia, A Cordeiro Oudot Choi, LD Corpe, M Corradi, F Corriveau, A Cortes-Gonzalez, MJ Costa, F Costanza, D Costanzo, BM Cote, J Couthures, G Cowan, K Cranmer, L Cremer, D Cremonini, S Crépé-Renaudin, F Crescioli, M Cristinziani, M Cristoforetti, V Croft, JE Crosby, G Crosetti, A Cueto, H Cui, Z Cui, WR Cunningham, F Curcio, JR Curran, P Czodrowski, MJ Da Cunha Sargedas De Sousa, JV Da Fonseca Pinto, C Da Via, W Dabrowski, T Dado, S Dahbi, T Dai, D Dal Santo, C Dallapiccola, M Dam, G D’amen, V D’Amico, J Damp, JR Dandoy, D Dannheim, M Danninger, V Dao, G Darbo, SJ Das, F Dattola, S D’Auria, A D’Avanzo, T Davidek, I Dawson, HA Day-hall, K De, C De Almeida Rossi, R De Asmundis, N De Biase, S De Castro, N De Groot, P de Jong, H De la Torre, A De Maria, A De Salvo, U De Sanctis, F De Santis, A De Santo, JB De Vivie De Regie, J Debevc, DV Dedovich, J Degens, AM Deiana, J Del Peso, L Delagrange, F Deliot, CM Delitzsch, M Della Pietra, D Della Volpe, A Dell’Acqua, L Dell’Asta, M Delmastro, CC Delogu, PA Delsart, S Demers, M Demichev, SP Denisov, H Denizli, L D’Eramo, D Derendarz, F Derue, P Dervan, K Desch, C Deutsch, FA Di Bello, A Di Ciaccio, L Di Ciaccio, A Di Domenico, C Di Donato, A Di Girolamo, G Di Gregorio, A Di Luca, B Di Micco, R Di Nardo, KF Di Petrillo, M Diamantopoulou, FA Dias, T Dias Do Vale, MA Diaz, AR Didenko, M Didenko, EB Diehl, S Díez Cornell, C Diez Pardos, C Dimitriadi, A Dimitrievska, A Dimri, J Dingfelder, T Dingley, I-M Dinu, SJ Dittmeier, F Dittus, M Divisek, B Dixit, F Djama, T Djobava, C Doglioni, A Dohnalova, Z Dolezal, K Domijan, KM Dona, M Donadelli, B Dong, J Donini, A D’Onofrio, M D’Onofrio, J Dopke, A Doria, N Dos Santos Fernandes, P Dougan, MT Dova, AT Doyle, MA Draguet, MP Drescher, E Dreyer, I Drivas-koulouris, M Drnevich, M Drozdova, D Du, TA du Pree, F Dubinin, M Dubovsky, E Duchovni, G Duckeck, OA Ducu, D Duda, A Dudarev, ER Duden, M D’uffizi, L Duflot, M Dührssen, I Duminica, AE Dumitriu, M Dunford, S Dungs, K Dunne, A Duperrin, H Duran Yildiz, M Düren, A Durglishvili, D Duvnjak, BL Dwyer, GI Dyckes, M Dyndal, BS Dziedzic, ZO Earnshaw, GH Eberwein, B Eckerova, S Eggebrecht, E Egidio Purcino De Souza, LF Ehrke, G Eigen, K Einsweiler, T Ekelof, PA Ekman, S El Farkh, Y El Ghazali, H El Jarrari, A El Moussaouy, V Ellajosyula, M Ellert, F Ellinghaus, N Ellis, J Elmsheuser, M Elsawy, M Elsing, D Emeliyanov, Y Enari, I Ene, S Epari, PA Erland, D Ernani Martins Neto, M Errenst, M Escalier, C Escobar, E Etzion, G Evans, H Evans, LS Evans, A Ezhilov, S Ezzarqtouni, F Fabbri, L Fabbri, G Facini, V Fadeyev, RM Fakhrutdinov, D Fakoudis, S Falciano, LF Falda Ulhoa Coelho, F Fallavollita, G Falsetti, J Faltova, C Fan, KY Fan, Y Fan, Y Fang, M Fanti, M Faraj, Z Farazpay, A Farbin, A Farilla, T Farooque, JN Farr, SM Farrington, F Fassi, D Fassouliotis, M Faucci Giannelli, WJ Fawcett, L Fayard, P Federic, P Federicova, OL Fedin, M Feickert, L Feligioni, DE Fellers, C Feng, Z Feng, MJ Fenton, L Ferencz, RAM Ferguson, P Fernandez Martinez, MJV Fernoux, J Ferrando, A Ferrari, P Ferrari, R Ferrari, D Ferrere, C Ferretti, MP Fewell, D Fiacco, F Fiedler, P Fiedler, S Filimonov, A Filipčič, EK Filmer, F Filthaut, MCN Fiolhais, L Fiorini, WC Fisher, T Fitschen, PM Fitzhugh, I Fleck, P Fleischmann, T Flick, M Flores, LR Flores Castillo, L Flores Sanz De Acedo, FM Follega, N Fomin, JH Foo, A Formica, AC Forti, E Fortin, AW Fortman, L Fountas, D Fournier, H Fox, P Francavilla, S Francescato, S Franchellucci, M Franchini, S Franchino, D Francis, L Franco, V Franco Lima, L Franconi, M Franklin, G Frattari, YY Frid, J Friend, N Fritzsche, A Froch, D Froidevaux, JA Frost, Y Fu, S Fuenzalida Garrido, M Fujimoto, KY Fung, E Furtado De Simas Filho, M Furukawa, J Fuster, A Gaa, A Gabrielli, A Gabrielli, P Gadow, G Gagliardi, LG Gagnon, S Gaid, S Galantzan, J Gallagher, EJ Gallas, AL Gallen, BJ Gallop, KK Gan, S Ganguly, Y Gao, A Garabaglu, FM Garay Walls, B Garcia, C García, A Garcia Alonso, AG Garcia Caffaro, JE García Navarro, M Garcia-Sciveres, GL Gardner, RW Gardner, N Garelli, RB Garg, JM Gargan, CA Garner, CM Garvey, VK Gassmann, G Gaudio, V Gautam, P Gauzzi, J Gavranovic, IL Gavrilenko, A Gavrilyuk, C Gay, G Gaycken, EN Gazis, A Gekow, C Gemme, MH Genest, AD Gentry, S George, WF George, T Geralis, AA Gerwin, P Gessinger-Befurt, ME Geyik, M Ghani, K Ghorbanian, A Ghosal, A Ghosh, A Ghosh, B Giacobbe, S Giagu, T Giani, A Giannini, SM Gibson, M Gignac, DT Gil, AK Gilbert, BJ Gilbert, D Gillberg, G Gilles, L Ginabat, DM Gingrich, MP Giordani, PF Giraud, G Giugliarelli, D Giugni, F Giuli, I Gkialas, LK Gladilin, C Glasman, G Glemža, M Glisic, I Gnesi, Y Go, M Goblirsch-Kolb, B Gocke, D Godin, B Gokturk, S Goldfarb, T Golling, MGD Gololo, D Golubkov, JP Gombas, A Gomes, G Gomes Da Silva, AJ Gomez Delegido, R Gonçalo, L Gonella, A Gongadze, F Gonnella, JL Gonski, RY González Andana, S González de la Hoz, R Gonzalez Lopez, C Gonzalez Renteria, MV Gonzalez Rodrigues, R Gonzalez Suarez, S Gonzalez-Sevilla, L Goossens, B Gorini, E Gorini, A Gorišek, TC Gosart, AT Goshaw, MI Gostkin, S Goswami, CA Gottardo, SA Gotz, M Gouighri, AG Goussiou, N Govender, RP Grabarczyk, I Grabowska-Bold, K Graham, E Gramstad, S Grancagnolo, CM Grant, PM Gravila, FG Gravili, HM Gray, M Greco, MJ Green, C Grefe, AS Grefsrud, IM Gregor, KT Greif, P Grenier, SG Grewe, AA Grillo, K Grimm, S Grinstein, J-F Grivaz, E Gross, J Grosse-Knetter, L Guan, JGR Guerrero Rojas, G Guerrieri, R Gugel, JAM Guhit, A Guida, E Guilloton, S Guindon, F Guo, J Guo, L Guo, L Guo, Y Guo, A Gupta, R Gupta, S Gurbuz, SS Gurdasani, G Gustavino, P Gutierrez, LF Gutierrez Zagazeta, M Gutsche, C Gutschow, C Gwenlan, CB Gwilliam, ES Haaland, A Haas, M Habedank, C Haber, HK Hadavand, A Hadef, AI Hagan, JJ Hahn, EH Haines, M Haleem, J Haley, GD Hallewell, L Halser, K Hamano, M Hamer, EJ Hampshire, J Han, L Han, L Han, S Han, K Hanagaki, M Hance, DA Hangal, H Hanif, MD Hank, JB Hansen, PH Hansen, D Harada, T Harenberg, S Harkusha, ML Harris, YT Harris, J Harrison, NM Harrison, PF Harrison, NM Hartman, NM Hartmann, RZ Hasan, Y Hasegawa, F Haslbeck, S Hassan, R Hauser, CM Hawkes, RJ Hawkings, Y Hayashi, D Hayden, C Hayes, RL Hayes, CP Hays, JM Hays, HS Hayward, F He, M He, Y He, Y He, NB Heatley, V Hedberg, AL Heggelund, C Heidegger, KK Heidegger, J Heilman, S Heim, T Heim, JG Heinlein, JJ Heinrich, L Heinrich, J Hejbal, A Held, S Hellesund, CM Helling, S Hellman, RCW Henderson, L Henkelmann, AM Henriques Correia, H Herde, Y Hernández Jiménez, LM Herrmann, T Herrmann, G Herten, R Hertenberger, L Hervas, ME Hesping, NP Hessey, J Hessler, M Hidaoui, N Hidic, E Hill, SJ Hillier, JR Hinds, F Hinterkeuser, M Hirose, S Hirose, D Hirschbuehl, TG Hitchings, B Hiti, J Hobbs, R Hobincu, N Hod, MC Hodgkinson, BH Hodkinson, A Hoecker, DD Hofer, J Hofer, M Holzbock, LBAH Hommels, BP Honan, JJ Hong, J Hong, TM Hong, BH Hooberman, WH Hopkins, MC Hoppesch, Y Horii, ME Horstmann, S Hou, MR Housenga, AS Howard, J Howarth, J Hoya, M Hrabovsky, T Hryn’ova, PJ Hsu, S-C Hsu, T Hsu, M Hu, Q Hu, S Huang, X Huang, Y Huang, Y Huang, Y Huang, Y Huang, Z Huang, Z Hubacek, M Huebner, F Huegging, TB Huffman, M Hufnagel Maranha De Faria, CA Hugli, M Huhtinen, SK Huiberts, R Hulsken, CE Hultquist, N Huseynov, J Huston, J Huth, R Hyneman, G Iacobucci, G Iakovidis, L Iconomidou-Fayard, JP Iddon, P Iengo, R Iguchi, Y Iiyama, T Iizawa, Y Ikegami, D Iliadis, N Ilic, H Imam, G Inacio Goncalves, SA Infante Cabanas, T Ingebretsen Carlson, JM Inglis, G Introzzi, M Iodice, V Ippolito, RK Irwin, M Ishino, W Islam, C Issever, S Istin, H Ito, R Iuppa, A Ivina, V Izzo, P Jacka, P Jackson, CS Jagfeld, G Jain, P Jain, K Jakobs, T Jakoubek, J Jamieson, W Jang, M Javurkova, P Jawahar, L Jeanty, J Jejelava, P Jenni, CE Jessiman, C Jia, H Jia, J Jia, X Jia, Z Jia, C Jiang, Q Jiang, S Jiggins, J Jimenez Pena, S Jin, A Jinaru, O Jinnouchi, P Johansson, KA Johns, JW Johnson, FA Jolly, DM Jones, E Jones, KS Jones, P Jones, RWL Jones, TJ 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Koeck, PT Koenig, T Koffas, O Kolay, I Koletsou, T Komarek, K Köneke, AXY Kong, T Kono, N Konstantinidis, P Kontaxakis, B Konya, R Kopeliansky, S Koperny, K Korcyl, K Kordas, A Korn, S Korn, I Korolkov, N Korotkova, B Kortman, O Kortner, S Kortner, WH Kostecka, VV Kostyukhin, A Kotsokechagia, A Kotwal, A Koulouris, A Kourkoumeli-Charalampidi, C Kourkoumelis, E Kourlitis, O Kovanda, R Kowalewski, W Kozanecki, AS Kozhin, VA Kramarenko, G Kramberger, P Kramer, MW Krasny, A Krasznahorkay, AC Kraus, JW Kraus, JA Kremer, T Kresse, L Kretschmann, J Kretzschmar, K Kreul, P Krieger, K Krizka, K Kroeninger, H Kroha, J Kroll, J Kroll, KS Krowpman, U Kruchonak, H Krüger, N Krumnack, MC Kruse, O Kuchinskaia, S Kuday, S Kuehn, R Kuesters, T Kuhl, V Kukhtin, Y Kulchitsky, S Kuleshov, M Kumar, N Kumari, P Kumari, A Kupco, T Kupfer, A Kupich, O Kuprash, H Kurashige, LL Kurchaninov, O Kurdysh, YA Kurochkin, A Kurova, M Kuze, AK Kvam, J Kvita, NG Kyriacou, LAO Laatu, C Lacasta, F Lacava, H Lacker, D 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Zhong, B Zhou, H Zhou, N Zhou, Y Zhou, Y Zhou, Y Zhou, CG Zhu, J Zhu, X Zhu, Y Zhu, Y Zhu, X Zhuang, K Zhukov, NI Zimine, J Zinsser, M Ziolkowski, L Živković, A Zoccoli, K Zoch, TG Zorbas, O Zormpa, W Zou, L Zwalinski

Neutrino interaction vertex reconstruction in DUNE with Pandora deep learning

The European Physical Journal C SpringerOpen 85:6 (2025) 697

Authors:

A Abed Abud, R Acciarri, MA Acero, MR Adames, G Adamov, M Adamowski, D Adams, M Adinolfi, C Adriano, A Aduszkiewicz, J Aguilar, F Akbar, F Alemanno, NS Alex, K Allison, M Alrashed, A Alton, R Alvarez, T Alves, A Aman, H Amar, P Amedo, J Anderson, C Andreopoulos, F Azfar

Abstract:

The Pandora Software Development Kit and algorithm libraries perform reconstruction of neutrino interactions in liquid argon time projection chamber detectors. Pandora is the primary event reconstruction software used at the Deep Underground Neutrino Experiment, which will operate four large-scale liquid argon time projection chambers at the far detector site in South Dakota, producing high-resolution images of charged particles emerging from neutrino interactions. While these high-resolution images provide excellent opportunities for physics, the complex topologies require sophisticated pattern recognition capabilities to interpret signals from the detectors as physically meaningful objects that form the inputs to physics analyses. A critical component is the identification of the neutrino interaction vertex. Subsequent reconstruction algorithms use this location to identify the individual primary particles and ensure they each result in a separate reconstructed particle. A new vertex-finding procedure described in this article integrates a U-ResNet neural network performing hit-level classification into the multi-algorithm approach used by Pandora to identify the neutrino interaction vertex. The machine learning solution is seamlessly integrated into a chain of pattern-recognition algorithms. The technique substantially outperforms the previous BDT-based solution, with a more than 20% increase in the efficiency of sub-1 cm vertex reconstruction across all neutrino flavours.

The Simons Observatory: validation of reconstructed power spectra from simulated filtered maps for the small aperture telescope survey

Journal of Cosmology and Astroparticle Physics IOP Publishing 2025:06 (2025) 055

Authors:

Carlos Hervías-Caimapo, Kevin Wolz, Adrien La Posta, Susanna Azzoni, David Alonso, Kam Arnold, Carlo Baccigalupi, Simon Biquard, Michael L Brown, Erminia Calabrese, Yuji Chinone, Samuel Day-Weiss, Jo Dunkley, Rolando Dünner, Josquin Errard, Giulio Fabbian, Ken Ganga, Serena Giardiello, Emilie Hertig, Kevin M Huffenberger, Bradley R Johnson, Baptiste Jost, Reijo Keskitalo, Theodore S Kisner

Abstract:

We present a transfer function-based method to estimate angular power spectra from filtered maps for cosmic microwave background (CMB) surveys. This is especially relevant for experiments targeting the faint primordial gravitational wave signatures in CMB polarisation at large scales, such as the Simons Observatory (SO) small aperture telescopes. While timestreams can be filtered to mitigate the contamination from low-frequency noise, usual methods that calculate the mode coupling at individual multipoles can be challenging for experiments covering large sky areas or reaching few-arcminute resolution. The method we present here, although approximate, is more practical and faster for larger data volumes. We validate it through the use of simulated observations approximating the first year of SO data, going from half-wave plate-modulated timestreams to maps, and using simulations to estimate the mixing of polarisation modes induced by an example of time-domain filtering. We show its performance through an example null test and with an end-to-end pipeline that performs inference on cosmological parameters, including the tensor-to-scalar ratio r. The performance demonstration uses simulated observations at multiple frequency bands. We find that the method can recover unbiased parameters for our simulated noise levels.