Modeling of the HERMES submillimeter source lensed by a dark matter dominated foreground group of galaxies

Astrophysical Journal 738:2 (2011)

Authors:

R Gavazzi, A Cooray, A Conley, JE Aguirre, A Amblard, R Auld, A Beelen, A Blain, R Blundell, J Bock, CM Bradford, C Bridge, D Brisbin, D Burgarella, P Chanial, E Chapin, N Christopher, DL Clements, P Cox, SG Djorgovski, CD Dowell, S Eales, L Earle, TP Ellsworth-Bowers, D Farrah, A Franceschini, H Fu, J Glenn, EA González Solares, M Griffin, MA Gurwell, M Halpern, E Ibar, RJ Ivison, M Jarvis, J Kamenetzky, S Kim, M Krips, L Levenson, R Lupu, A Mahabal, PD Maloney, C Maraston, L Marchetti, G Marsden, H Matsuhara, AMJ Mortier, E Murphy, BJ Naylor, R Neri, HT Nguyen, SJ Oliver, A Omont, MJ Page, A Papageorgiou, CP Pearson, I Pérez-Fournon, M Pohlen, N Rangwala, JI Rawlings, G Raymond, D Riechers, G Rodighiero, IG Roseboom, M Rowan-Robinson, B Schulz, D Scott, KS Scott, P Serra, N Seymour, DL Shupe, AJ Smith, M Symeonidis, KE Tugwell, M Vaccari, E Valiante, I Valtchanov, A Verma, JD Vieira, L Vigroux, L Wang, J Wardlow, D Wiebe, G Wright, CK Xu, G Zeimann, M Zemcov, J Zmuidzinas

Abstract:

We present the results of a gravitational lensing analysis of the bright z s = 2.957 submillimeter galaxy (SMG) HERMES found in the Herschel/SPIRE science demonstration phase data from the Herschel Multi-tiered Extragalactic Survey (HerMES) project. The high-resolution imaging available in optical and near-IR channels, along with CO emission obtained with the Plateau de Bure Interferometer, allows us to precisely estimate the intrinsic source extension and hence estimate the total lensing magnification to be μ = 10.9 ± 0.7. We measure the half-light radius R eff of the source in the rest-frame near-UV and V bands that characterize the unobscured light coming from stars and find R eff, * = [2.0 ± 0.1] kpc, in good agreement with recent studies on the SMG population. This lens model is also used to estimate the size of the gas distribution (Reff, gas = [1.1 ± 0.5] kpc) by mapping back in the source plane the CO (J = 5 → 4) transition line emission. The lens modeling yields a relatively large Einstein radius R Ein = 4.″10 ± 0″.02, corresponding to a deflector velocity dispersion of [483 ± 16] km s -1. This shows that HERMES is lensed by a galaxy group-size dark matter halo at redshift z l ∼ 0.6. The projected dark matter contribution largely dominates the mass budget within the Einstein radius with f dm(< R Ein) ∼ 80%. This fraction reduces to f dm(< R eff, G1 ≃ 4.5 kpc) ∼ 47% within the effective radius of the main deflecting galaxy of stellar mass M *, G1 = [8.5 ± 1.6] × 1011 M ⊙. At this smaller scale the dark matter fraction is consistent with results already found for massive lensing ellipticals at z ∼ 0.2 from the Sloan Lens ACS Survey. © 2011. The American Astronomical Society. All rights reserved.

Measurement of the inelastic proton-proton cross-section at root s=7 TeV with the ATLAS detector

Nature Communications Springer Nature 2 (2011) 463

Authors:

K Cranmer, F Crescioli, PVM Da Silvaa, C Da Via, W Davey, T Davidek, N Davidson, R Davidson, R De Asmundis, S De Castro, PEDCF Salgado, J De Graat, U De Sanctis, A De Santo, JBDV De Regie, S Dean, J Degenhardt, PA Delsart, C Deluca, D Derendarz, JE Derkaouid, A Dewhurst, B Dewilde, J Ernwein, S Errede

Abstract:

The dependence of the rate of proton–proton interactions on the centre-of-mass collision energy, √s, is of fundamental importance for both hadron collider physics and particle astrophysics. The dependence cannot yet be calculated from first principles; therefore, experimental measurements are needed. Here we present the first measurement of the inelastic proton–proton interaction cross-section at a centre-of-mass energy, √s, of 7 TeV using the ATLAS detector at the Large Hadron Collider. Events are selected by requiring hits on scintillation counters mounted in the forward region of the detector. An inelastic cross-section of 60.3±2.1 mb is measured for ξ>5×10−6, where ξ is calculated from the invariant mass, MX, of hadrons selected using the largest rapidity gap in the event. For diffractive events, this corresponds to requiring at least one of the dissociation masses to be larger than 15.7 GeV.

A new model for the infrared emission of IRAS F10214+4724

Proceedings of the International Astronomical Union 7:S284 (2011) 205-209

Authors:

A Efstathiou, N Christopher, A Verma, R Siebenmorgen

Abstract:

We present a new model for the infrared emission of the high redshift hyperluminous infrared galaxy IRAS F10214+4724 which takes into account recent photometric data from Spitzer and Herschel that sample the peak of its spectral energy distribution. We first demonstrate that the combination of the AGN tapered disc and starburst models of Efstathiou and coworkers, while able to give an excellent fit to the average spectrum of type 2 AGN measured by Spitzer, fails to match the spectral energy distribution of IRAS F10214+4724. This is mainly due to the fact that the ν S ν distribution of the galaxy falls very steeply with increasing frequency (a characteristic of heavy absorption by dust) but shows a silicate feature in emission. We propose a model that assumes two components of emission: clouds that are associated with the narrow-line region and a highly obscured starburst. The emission from the clouds must suffer significantly stronger gravitational lensing compared to the emission from the torus to explain the observed spectral energy distribution. © 2012 International Astronomical Union.

Properties of jets measured from tracks in proton-proton collisions at center-of-mass energy s=7 TeV with the ATLAS detector

Physical Review D American Physical Society (APS) 84:5 (2011) 054001

Authors:

G Aad, B Abbott, J Abdallah, AA Abdelalim, A Abdesselam, O Abdinov, B Abi, M Abolins, H Abramowicz, H Abreu, E Acerbi, BS Acharya, DL Adams, TN Addy, J Adelman, M Aderholz, S Adomeit, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, T Akdogan, TPA Åkesson, G Akimoto, AV Akimov, A Akiyama, MS Alam, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, M Aliyev, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, MG Alviggi, K Amako, P Amaral, C Amelung, VV Ammosov, A Amorim, G Amorós, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, M-L Andrieux, XS Anduaga, A Angerami, F Anghinolfi, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, S Aoun, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, JP Archambault, S Arfaoui, J-F Arguin, E Arik, M Arik, AJ Armbruster, O Arnaez, C Arnault, A Artamonov, G Artoni, D Arutinov, S Asai, R Asfandiyarov, S Ask, B Åsman, L Asquith, K Assamagan, A Astbury, A Astvatsatourov, G Atoian, B Aubert, B Auerbach, E Auge, K Augsten, M Aurousseau, N Austin, G Avolio, R Avramidou, D Axen, C Ay, G Azuelos, Y Azuma, MA Baak, G Baccaglioni, C Bacci, AM Bach, H Bachacou, K Bachas, G Bachy, M Backes, M Backhaus, E Badescu, P Bagnaia, S Bahinipati, Y Bai, DC Bailey, T Bain, JT Baines, OK Baker, MD Baker, S Baker, E Banas, P Banerjee, Sw Banerjee, D Banfi, A Bangert, V Bansal, HS Bansil, L Barak, SP Baranov, A Barashkou, A Barbaro Galtieri, T Barber, EL Barberio, D Barberis, M Barbero, DY Bardin, T Barillari, M Barisonzi, T Barklow, N Barlow, BM Barnett, RM Barnett, A Baroncelli, G Barone, AJ Barr, F Barreiro, J Barreiro Guimarães da Costa, P Barrillon, R Bartoldus, AE Barton, D Bartsch, V Bartsch, RL Bates, L Batkova, JR Batley, A Battaglia, M Battistin, G Battistoni, F Bauer, HS Bawa, B Beare, T Beau, PH Beauchemin, R Beccherle, P Bechtle, HP Beck, M Beckingham, KH Becks, AJ Beddall, A Beddall, S Bedikian, VA Bednyakov, CP Bee, M Begel, S Behar Harpaz, PK Behera, M Beimforde, C Belanger-Champagne, PJ Bell, WH Bell, G Bella, L Bellagamba, F Bellina, M Bellomo, A Belloni, O Beloborodova, K Belotskiy, O Beltramello, S Ben Ami, O Benary, D Benchekroun, C Benchouk, M Bendel, BH Benedict, N Benekos, Y Benhammou, DP Benjamin, M Benoit, JR Bensinger, K Benslama, S Bentvelsen, D Berge, E Bergeaas Kuutmann, N Berger, F Berghaus, E Berglund, J Beringer, K Bernardet, P Bernat, R Bernhard, C Bernius, T Berry, A Bertin, F Bertinelli, F Bertolucci, MI Besana, N Besson, S Bethke, W Bhimji, RM Bianchi, M Bianco, O Biebel, SP Bieniek, K Bierwagen, J Biesiada, M Biglietti, H Bilokon, M Bindi, S Binet, A Bingul, C Bini, C Biscarat, U Bitenc, KM Black, RE Blair, J-B Blanchard, G Blanchot, T Blazek, C Blocker, J Blocki, A Blondel, W Blum, U Blumenschein, GJ Bobbink, VB Bobrovnikov, SS Bocchetta, A Bocci, CR Boddy, M Boehler, J Boek, N Boelaert, S Böser, JA Bogaerts, A Bogdanchikov, A Bogouch, C Bohm, V Boisvert, T Bold, V Boldea, NM Bolnet, M Bona, VG Bondarenko, M Boonekamp, G Boorman, CN Booth, S Bordoni, C Borer, A Borisov, G Borissov, I Borjanovic, S Borroni, K Bos, D Boscherini, M Bosman, H Boterenbrood, D Botterill, J Bouchami, J Boudreau, EV Bouhova-Thacker, C Bourdarios, N Bousson, A Boveia, J Boyd, IR Boyko, NI Bozhko, I Bozovic-Jelisavcic, J Bracinik, A Braem, P Branchini, GW Brandenburg, A Brandt, G Brandt, O Brandt, U Bratzler, B Brau, JE Brau, HM Braun, B Brelier, J Bremer, R Brenner, S Bressler, D Breton, D Britton, FM Brochu, I Brock, R Brock, TJ Brodbeck, E Brodet, F Broggi, C Bromberg, G Brooijmans, WK Brooks, G Brown, H Brown, PA Bruckman de Renstrom, D Bruncko, R Bruneliere, S Brunet, A Bruni, G Bruni, M Bruschi, T Buanes, F Bucci, J Buchanan, NJ Buchanan, P Buchholz, RM Buckingham, AG Buckley, SI Buda, IA Budagov, B Budick, V Büscher, L Bugge, D Buira-Clark, O Bulekov, M Bunse, T Buran, H Burckhart, S Burdin, T Burgess, S Burke, E Busato, P Bussey, CP Buszello, F Butin, B Butler, JM Butler, CM Buttar, JM Butterworth, W Buttinger, T Byatt, S Cabrera Urbán, D Caforio, O Cakir, P Calafiura, G Calderini, P Calfayan, R Calkins, LP Caloba, R Caloi, D Calvet, S Calvet, R Camacho Toro, P Camarri, M Cambiaghi, D Cameron, S Campana, M Campanelli, V Canale, F Canelli, A Canepa, J Cantero, L Capasso, MDM Capeans Garrido, I Caprini, M Caprini, D Capriotti, M Capua, R Caputo, C Caramarcu, R Cardarelli, T Carli, G Carlino, L Carminati, B Caron, S Caron, GD Carrillo Montoya, AA Carter, JR Carter, J Carvalho, D Casadei, MP Casado, M Cascella, C Caso, AM Castaneda Hernandez, E Castaneda-Miranda, V Castillo Gimenez, NF Castro, G Cataldi, F Cataneo, A Catinaccio, JR Catmore, A Cattai, G Cattani, S Caughron, D Cauz, P Cavalleri, D Cavalli, M Cavalli-Sforza, V Cavasinni, F Ceradini, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, SA Cetin, F Cevenini, A Chafaq, D Chakraborty, K Chan, B Chapleau, JD Chapman, JW Chapman, E Chareyre, DG Charlton, V Chavda, CA Chavez Barajas, S Cheatham, S Chekanov, SV Chekulaev, GA Chelkov, MA Chelstowska, C Chen, H Chen, S Chen, T Chen, X Chen, S Cheng, A Cheplakov, VF Chepurnov, R Cherkaoui El Moursli, V Chernyatin, E Cheu, SL Cheung, L Chevalier, G Chiefari, L Chikovani, JT Childers, A Chilingarov, G Chiodini, MV Chizhov, G Choudalakis, S Chouridou, IA Christidi, A Christov, D Chromek-Burckhart, ML Chu, J Chudoba, G Ciapetti, K Ciba, AK Ciftci, R Ciftci, D Cinca, V Cindro, MD Ciobotaru, C Ciocca, A Ciocio, M Cirilli, M Ciubancan, A Clark, PJ Clark, W Cleland, JC Clemens, B Clement, C Clement, RW Clifft, Y Coadou, M Cobal, A Coccaro, J Cochran, P Coe, JG Cogan, J Coggeshall, E Cogneras, CD Cojocaru, J Colas, AP Colijn, C Collard, NJ Collins, C Collins-Tooth, J Collot, G Colon, P Conde Muiño, E Coniavitis, MC Conidi, M Consonni, V Consorti, S Constantinescu, C Conta, F Conventi, J Cook, M Cooke, BD Cooper, AM Cooper-Sarkar, NJ Cooper-Smith, K Copic, T Cornelissen, M Corradi, F Corriveau, A Cortes-Gonzalez, G Cortiana, G Costa, MJ Costa, D Costanzo, T Costin, D Côté, R Coura Torres, L Courneyea, G Cowan, C Cowden, BE Cox, K Cranmer, F Crescioli, M Cristinziani, G Crosetti, R Crupi, S Crépé-Renaudin, C-M Cuciuc, C Cuenca Almenar, T Cuhadar Donszelmann, M Curatolo, CJ Curtis, P Cwetanski, H Czirr, Z Czyczula, S D’Auria, M D’Onofrio, A D’Orazio, PVM Da Silva, C Da Via, W Dabrowski, T Dai, C Dallapiccola, M Dam, M Dameri, DS Damiani, HO Danielsson, D Dannheim, V Dao, G Darbo, GL Darlea, C Daum, JP Dauvergne, W Davey, T Davidek, N Davidson, R Davidson, E Davies, M Davies, AR Davison, Y Davygora, E Dawe, I Dawson, JW Dawson, RK Daya, K De, R de Asmundis, S De Castro, PE De Castro Faria Salgado, S De Cecco, J de Graat, N De Groot, P de Jong, C De La Taille, H De la Torre, B De Lotto, L De Mora, L De Nooij, M De Oliveira Branco, D De Pedis, A De Salvo, U De Sanctis, A De Santo, J De Vivie De B. Regie, S Dean, DV Dedovich, J Degenhardt, M Dehchar, C Del Papa, J Del Peso, T Del Prete, M Deliyergiyev, A Dell’Acqua, L Dell’Asta, M Della Pietra, D della Volpe, M Delmastro, P Delpierre, N Delruelle, PA Delsart, C Deluca, S Demers, M Demichev, B Demirkoz, J Deng, SP Denisov, D Derendarz, JE Derkaoui, F Derue, P Dervan, K Desch, E Devetak, PO Deviveiros, A Dewhurst, B DeWilde, S Dhaliwal, R Dhullipudi, A Di Ciaccio, L Di Ciaccio, A Di Girolamo, B Di Girolamo, S Di Luise, A Di Mattia, B Di Micco, R Di Nardo, A Di Simone, R Di Sipio, MA Diaz, F Diblen, EB Diehl, J Dietrich, TA Dietzsch, S Diglio, K Dindar Yagci, J Dingfelder, C Dionisi, P Dita, S Dita, F Dittus, F Djama, T Djobava, MAB do Vale, A Do Valle Wemans, TKO Doan, M Dobbs, R Dobinson, D Dobos, E Dobson, M Dobson, J Dodd, C Doglioni, T Doherty, Y Doi, J Dolejsi, I Dolenc, Z Dolezal, BA Dolgoshein, T Dohmae, M Donadelli, M Donega, J Donini, J Dopke, A Doria, A Dos Anjos, M Dosil, A Dotti, MT Dova, JD Dowell, AD Doxiadis, AT Doyle, Z Drasal, J Drees, N Dressnandt, H Drevermann, C Driouichi, M Dris, J Dubbert, T Dubbs, S Dube, E Duchovni, G Duckeck, A Dudarev, F Dudziak, M Dührssen, IP Duerdoth, L Duflot, M-A Dufour, M Dunford, H Duran Yildiz, R Duxfield, M Dwuznik, F Dydak, D Dzahini, M Düren, WL Ebenstein, J Ebke, S Eckert, S Eckweiler, K Edmonds, CA Edwards, NC Edwards, W Ehrenfeld, T Ehrich, T Eifert, G Eigen, K Einsweiler, E Eisenhandler, T Ekelof, M El Kacimi, M Ellert, S Elles, F Ellinghaus, K Ellis, N Ellis, J Elmsheuser, M Elsing, D Emeliyanov, R Engelmann, A Engl, B Epp, A Eppig, J Erdmann, A Ereditato, D Eriksson, J Ernst, M Ernst, J Ernwein, D Errede, S Errede, E Ertel, M Escalier, C Escobar, X Espinal Curull, B Esposito, F Etienne, AI Etienvre, E Etzion, D Evangelakou, H Evans, L Fabbri, C Fabre, RM Fakhrutdinov, S Falciano, Y Fang, M Fanti, A Farbin, A Farilla, J Farley, T Farooque, SM Farrington, P Farthouat, P Fassnacht, D Fassouliotis, B Fatholahzadeh, A Favareto, L Fayard, S Fazio, R Febbraro, P Federic, OL Fedin, W Fedorko, M Fehling-Kaschek, L Feligioni, D Fellmann, CU Felzmann, C Feng, EJ Feng, AB Fenyuk, J Ferencei, J Ferland, W Fernando, S Ferrag, J Ferrando, V Ferrara, A Ferrari, P Ferrari, R Ferrari, A Ferrer, ML Ferrer, D Ferrere, C Ferretti, A Ferretto Parodi, M Fiascaris, F Fiedler, A Filipčič, A Filippas, F Filthaut, M Fincke-Keeler, MCN Fiolhais, L Fiorini, A Firan, G Fischer, P Fischer, MJ Fisher, SM Fisher, M Flechl, I Fleck, J Fleckner, P Fleischmann, S Fleischmann, T Flick, LR Flores Castillo, MJ Flowerdew, M Fokitis, T Fonseca Martin, DA Forbush, A Formica, A Forti, D Fortin, JM Foster, D Fournier, A Foussat, AJ Fowler, K Fowler, H Fox, P Francavilla, S Franchino, D Francis, T Frank, M Franklin, S Franz, M Fraternali, S Fratina, ST French, F Friedrich, R Froeschl, D Froidevaux, JA Frost, C Fukunaga, E Fullana Torregrosa, J Fuster, C Gabaldon, O Gabizon, T Gadfort, S Gadomski, G Gagliardi, P Gagnon, C Galea, EJ Gallas, MV Gallas, V Gallo, BJ Gallop, P Gallus, E Galyaev, KK Gan, YS Gao, VA Gapienko, A Gaponenko, F Garberson, M Garcia-Sciveres, C García, JE García Navarro, RW Gardner, N Garelli, H Garitaonandia, V Garonne, J Garvey, C Gatti, G Gaudio, O Gaumer, B Gaur, L Gauthier, IL Gavrilenko, C Gay, G Gaycken, J-C Gayde, EN Gazis, P Ge, CNP Gee, DAA Geerts, Ch Geich-Gimbel, K Gellerstedt, C Gemme, A Gemmell, MH Genest, S Gentile, M George, S George, P Gerlach, A Gershon, C Geweniger, H Ghazlane, P Ghez, N Ghodbane, B Giacobbe, S Giagu, V Giakoumopoulou, V Giangiobbe, F Gianotti, B Gibbard, A Gibson, SM Gibson, LM Gilbert, M Gilchriese, V Gilewsky, D Gillberg, AR Gillman, DM Gingrich, J Ginzburg, N Giokaris, R Giordano, FM Giorgi, P Giovannini, PF Giraud, D Giugni, M Giunta, P Giusti, BK Gjelsten, LK Gladilin, C Glasman, J Glatzer, A Glazov, KW Glitza, GL Glonti, J Godfrey, J Godlewski, M Goebel, T Göpfert, C Goeringer, C Gössling, T Göttfert, S Goldfarb, D Goldin, T Golling, SN Golovnia, A Gomes, LS Gomez Fajardo, R Gonçalo, J Goncalves Pinto Firmino Da Costa, L Gonella, A Gonidec, S Gonzalez, S González de la Hoz, ML Gonzalez Silva, S Gonzalez-Sevilla, JJ Goodson, L Goossens, PA Gorbounov, HA Gordon, I Gorelov, G Gorfine, B Gorini, E Gorini, A Gorišek, E Gornicki, SA Gorokhov, VN Goryachev, B Gosdzik, M Gosselink, MI Gostkin, I Gough Eschrich, M Gouighri, D Goujdami, MP Goulette, AG Goussiou, C Goy, I Grabowska-Bold, V Grabski, P Grafström, C Grah, K-J Grahn, F Grancagnolo, S Grancagnolo, V Grassi, V Gratchev, N Grau, HM Gray, JA Gray, E Graziani, OG Grebenyuk, D Greenfield, T Greenshaw, ZD Greenwood, K Gregersen, IM Gregor, P Grenier, J Griffiths, N Grigalashvili, AA Grillo, S Grinstein, YV Grishkevich, J-F Grivaz, J Grognuz, M Groh, E Gross, J Grosse-Knetter, J Groth-Jensen, K Grybel, VJ Guarino, D Guest, C Guicheney, A Guida, T Guillemin, S Guindon, H Guler, J Gunther, B Guo, J Guo, A Gupta, Y Gusakov, VN Gushchin, A Gutierrez, P Gutierrez, N Guttman, O Gutzwiller, C Guyot, C Gwenlan, CB Gwilliam, A Haas, S Haas, C Haber, R Hackenburg, HK Hadavand, DR Hadley, P Haefner, F Hahn, S Haider, Z Hajduk, H Hakobyan, J Haller, K Hamacher, P Hamal, A Hamilton, S Hamilton, H Han, L Han, K Hanagaki, M Hance, C Handel, P Hanke, JR Hansen, JB Hansen, JD Hansen, PH Hansen, P Hansson, K Hara, GA Hare, T Harenberg, S Harkusha, D Harper, RD Harrington, OM Harris, K Harrison, J Hartert, F Hartjes, T Haruyama, A Harvey, S Hasegawa, Y Hasegawa, S Hassani, M Hatch, D Hauff, S Haug, M Hauschild, R Hauser, M Havranek, BM Hawes, CM Hawkes, RJ Hawkings, D Hawkins, T Hayakawa, D Hayden, HS Hayward, SJ Haywood, E Hazen, M He, SJ Head, V Hedberg, L Heelan, S Heim, B Heinemann, S Heisterkamp, L Helary, M Heller, S Hellman, D Hellmich, C Helsens, RCW Henderson, M Henke, A Henrichs, AM Henriques Correia, S Henrot-Versille, F Henry-Couannier, C Hensel, T Henß, CM Hernandez, Y Hernández Jiménez, R Herrberg, AD Hershenhorn, G Herten, R Hertenberger, L Hervas, NP Hessey, A Hidvegi, E Higón-Rodriguez, D Hill, JC Hill, N Hill, KH Hiller, S Hillert, SJ Hillier, I Hinchliffe, E Hines, M Hirose, F Hirsch, D Hirschbuehl, J Hobbs, N Hod, MC Hodgkinson, P Hodgson, A Hoecker, MR Hoeferkamp, J Hoffman, D Hoffmann, M Hohlfeld, M Holder, SO Holmgren, T Holy, JL Holzbauer, Y Homma, TM Hong, L Hooft van Huysduynen, T Horazdovsky, C Horn, S Horner, K Horton, J-Y Hostachy, S Hou, MA Houlden, A Hoummada, J Howarth, DF Howell, I Hristova, J Hrivnac, I Hruska, T Hryn’ova, PJ Hsu, S-C Hsu, GS Huang, Z Hubacek, F Hubaut, F Huegging, TB Huffman, EW Hughes, G Hughes, RE Hughes-Jones, M Huhtinen, P Hurst, M Hurwitz, U Husemann, N Huseynov, J Huston, J Huth, G Iacobucci, G Iakovidis, M Ibbotson, I Ibragimov, R Ichimiya, L Iconomidou-Fayard, J Idarraga, M Idzik, P Iengo, O Igonkina, Y Ikegami, M Ikeno, Y Ilchenko, D Iliadis, D Imbault, M Imhaeuser, M Imori, T Ince, J Inigo-Golfin, P Ioannou, M Iodice, G Ionescu, A Irles Quiles, K Ishii, A Ishikawa, M Ishino, R Ishmukhametov, C Issever, S Istin, AV Ivashin, W Iwanski, 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The star-formation histories of early-type galaxies from ATLAS3D

Proceedings of the International Astronomical Union 7:S284 (2011) 244-247

Authors:

RM McDermid, K Alatalo, L Blitz, M Bois, F Bournaud, M Bureau, M Cappellari, AF Crocker, RL Davies, TA Davis, PT De Zeeuw, PA Duc, E Emsellem, S Khochfar, D KrajnoviÄ, H Kuntschner, PY Lablanche, R Morganti, T Naab, T Oosterloo, M Sarzi, N Scott, P Serra, AM Weijmans, LM Young

Abstract:

We present an exploration of the integrated stellar populations of early-type galaxies (ETGs) from the ATLAS3D survey. We use two approaches: firstly the application of line-indices interpreted through single stellar population (SSP) models, which provide a single value of age, metallicity and abundance ratio. And secondly, by fitting a linear combination of SSP spectra to our data, smoothly weighted in the free parameters of age and metallicity, thereby inferring a star-formation history of these galaxies. Despite the significant differences in these approaches, we obtain generally consistent results, such that galaxies that are more massive appear older with enhanced abundance ratios using line indices, and have shorter star-formation histories weighted to early times. We highlight two limitations of the index-SSP approach. Firstly the SSP-equivalent ages belie the fact that ETGs are overwhelmingly composed of ancient stars. Secondly, the young stellar contributions implied in our star formation histories are required to obtain realistic UV-optical colours. We remark that, even fitting solar-abundance models, we can recover a star-formation duration that correlates with the measured alpha-enhancement, in agreement with other recent work. © 2012 International Astronomical Union.