Indications of suppression of excited Υ states in Pb-Pb collisions at √(s(NN))=2.76 TeV.

Phys Rev Lett 107:5 (2011) 052302

Authors:

S Chatrchyan, V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Erö, C Fabjan, M Friedl, R Frühwirth, VM Ghete, J Hammer, S Hänsel, M Hoch, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, M Krammer, D Liko, I Mikulec, M Pernicka, B Rahbaran, H Rohringer, R Schöfbeck, J Strauss, A Taurok, F Teischinger, P Wagner, W Waltenberger, G Walzel, E Widl, C-E Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Bansal, L Benucci, EA De Wolf, X Janssen, J Maes, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, H Van Haevermaet, P Van Mechelen, N Van Remortel, F Blekman, S Blyweert, J D'Hondt, O Devroede, R Gonzalez Suarez, A Kalogeropoulos, M Maes, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, O Charaf, B Clerbaux, G De Lentdecker, V Dero, APR Gay, GH Hammad, T Hreus, PE Marage, L Thomas, C Vander Velde, P Vanlaer, V Adler, A Cimmino, S Costantini, M Grunewald, B Klein, J Lellouch, A Marinov, J McCartin, D Ryckbosch, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, N Zaganidis, S Basegmez, G Bruno, J Caudron, L Ceard, E Cortina Gil, J De Favereau De Jeneret, C Delaere, D Favart, A Giammanco, G Grégoire, J Hollar, V Lemaitre, J Liao, O Militaru, C Nuttens, S Ovyn, D Pagano, A Pin, K Piotrzkowski, N Schul, N Beliy, T Caebergs, E Daubie, GA Alves, L Brito, D De Jesus Damiao, ME Pol, MHG Souza, WL Aldá Júnior, W Carvalho, EM Da Costa, C De Oliveira Martins, S Fonseca De Souza, L Mundim, H Nogima, V Oguri, WL Prado Da Silva, A Santoro, SM Silva Do Amaral, A Sznajder, CA Bernardes, FA Dias, TR Fernandez Perez Tomei, EM Gregores, C Lagana, F Marinho, PG Mercadante, SF Novaes, Sandra S Padula, N Darmenov, V Genchev, P Iaydjiev, S Piperov, M Rodozov, S Stoykova, G Sultanov, V Tcholakov, R Trayanov, A Dimitrov, R Hadjiiska, A Karadzhinova, V Kozhuharov, L Litov, M Mateev, B Pavlov, P Petkov, JG Bian, GM Chen, HS Chen, CH Jiang, D Liang, S Liang, X Meng, J Tao, J Wang, J Wang, X Wang, Z Wang, H Xiao, M Xu, J Zang, Z Zhang, Y Ban, S Guo, Y Guo, W Li, Y Mao, SJ Qian, H Teng, B Zhu, W Zou, A Cabrera, B Gomez Moreno, AA Ocampo Rios, AF Osorio Oliveros, JC Sanabria, N Godinovic, D Lelas, K Lelas, R Plestina, D Polic, I Puljak, Z Antunovic, M Dzelalija, V Brigljevic, S Duric, K Kadija, S Morovic, A Attikis, M Galanti, J Mousa, C Nicolaou, F Ptochos, PA Razis, M Finger, M Finger, Y Assran, A Ellithi Kamel, S Khalil, MA Mahmoud, A Hektor, M Kadastik, M Müntel, M Raidal, L Rebane, A Tiko, V Azzolini, P Eerola, G Fedi, S Czellar, J Härkönen, A Heikkinen, V Karimäki, R Kinnunen, MJ Kortelainen, T Lampén, K Lassila-Perini, S Lehti, T Lindén, P Luukka, T Mäenpää, E Tuominen, J Tuominiemi, E Tuovinen, D Ungaro, L Wendland, K Banzuzi, A Karjalainen, A Korpela, T Tuuva, D Sillou, M Besancon, S Choudhury, M Dejardin, D Denegri, B Fabbro, JL Faure, F Ferri, S Ganjour, FX Gentit, A Givernaud, P Gras, G Hamel de Monchenault, P Jarry, E Locci, J Malcles, M Marionneau, L Millischer, J Rander, A Rosowsky, I Shreyber, M Titov, P Verrecchia, S Baffioni, F Beaudette, L Benhabib, L Bianchini, M Bluj, C Broutin, P Busson, C Charlot, T Dahms, L Dobrzynski, S Elgammal, R Granier de Cassagnac, M Haguenauer, P Miné, C Mironov, C Ochando, P Paganini, D Sabes, R Salerno, Y Sirois, C Thiebaux, B Wyslouch, A Zabi, J-L Agram, J Andrea, D Bloch, D Bodin, J-M Brom, M Cardaci, EC Chabert, C Collard, E Conte, F Drouhin, C Ferro, J-C Fontaine, D Gelé, U Goerlach, S Greder, P Juillot, M Karim, A-C Le Bihan, Y Mikami, P Van Hove, F Fassi, D Mercier, C Baty, S Beauceron, N Beaupere, M Bedjidian, O Bondu, G Boudoul, D Boumediene, H Brun, J Chasserat, R Chierici, D Contardo, P Depasse, H El Mamouni, J Fay, S Gascon, B Ille, T Kurca, T Le Grand, M Lethuillier, L Mirabito, S Perries, V Sordini, S Tosi, Y Tschudi, P Verdier, D Lomidze, G Anagnostou, S Beranek, M Edelhoff, L Feld, N Heracleous, O Hindrichs, R Jussen, K Klein, J Merz, N Mohr, A Ostapchuk, A Perieanu, F Raupach, J Sammet, S Schael, D Sprenger, H Weber, M Weber, B Wittmer, M Ata, E Dietz-Laursonn, M Erdmann, T Hebbeker, C Heidemann, A Hinzmann, K Hoepfner, T Klimkovich, D Klingebiel, P Kreuzer, D Lanske, J Lingemann, C Magass, M Merschmeyer, A Meyer, P Papacz, H Pieta, H Reithler, SA Schmitz, L Sonnenschein, J Steggemann, D Teyssier, M Bontenackels, M Davids, M Duda, G Flügge, H Geenen, M Giffels, W Haj Ahmad, D Heydhausen, F Hoehle, B Kargoll, T Kress, Y Kuessel, A Linn, A Nowack, L Perchalla, O Pooth, J Rennefeld, P Sauerland, A Stahl, M Thomas, D Tornier, MH Zoeller, M Aldaya Martin, W Behrenhoff, U Behrens, M Bergholz, A Bethani, K Borras, A Cakir, A Campbell, E Castro, D Dammann, G Eckerlin, D Eckstein, A Flossdorf, G Flucke, A Geiser, J Hauk, H Jung, M Kasemann, I Katkov, P Katsas, C Kleinwort, H Kluge, A Knutsson, M Krämer, D Krücker, E Kuznetsova, W Lange, W Lohmann, R Mankel, M Marienfeld, I-A Melzer-Pellmann, AB Meyer, J Mnich, A Mussgiller, J Olzem, A Petrukhin, D Pitzl, A Raspereza, A Raval, M Rosin, R Schmidt, T Schoerner-Sadenius, N Sen, A Spiridonov, M Stein, J Tomaszewska, R Walsh, C Wissing, C Autermann, V Blobel, S Bobrovskyi, J Draeger, H Enderle, U Gebbert, M Görner, T Hermanns, K Kaschube, G Kaussen, H Kirschenmann, R Klanner, J Lange, B Mura, S Naumann-Emme, F Nowak, N Pietsch, C Sander, H Schettler, P Schleper, E Schlieckau, M Schröder, T Schum, H Stadie, G Steinbrück, J Thomsen, C Barth, J Bauer, J Berger, V Buege, T Chwalek, W De Boer, A Dierlamm, G Dirkes, M Feindt, J Gruschke, C Hackstein, F Hartmann, M Heinrich, H Held, KH Hoffmann, S Honc, JR Komaragiri, T Kuhr, D Martschei, S Mueller, Th Müller, M Niegel, O Oberst, A Oehler, J Ott, T Peiffer, G Quast, K Rabbertz, F Ratnikov, N Ratnikova, M Renz, C Saout, A Scheurer, P Schieferdecker, F-P Schilling, G Schott, HJ Simonis, FM Stober, D Troendle, J Wagner-Kuhr, T Weiler, M Zeise, V Zhukov, EB Ziebarth, G Daskalakis, T Geralis, S Kesisoglou, A Kyriakis, D Loukas, I Manolakos, A Markou, C Markou, C Mavrommatis, E Ntomari, E Petrakou, L Gouskos, TJ Mertzimekis, A Panagiotou, E Stiliaris, I Evangelou, C Foudas, P Kokkas, N Manthos, I Papadopoulos, V Patras, FA Triantis, A Aranyi, G Bencze, L Boldizsar, C Hajdu, P Hidas, D Horvath, A Kapusi, K Krajczar, F Sikler, GI Veres, G Vesztergombi, N Beni, J Molnar, J Palinkas, Z Szillasi, V Veszpremi, P Raics, ZL Trocsanyi, B Ujvari, SB Beri, V Bhatnagar, N Dhingra, R Gupta, M Jindal, M Kaur, JM Kohli, MZ Mehta, N Nishu, LK Saini, A Sharma, AP Singh, J Singh, SP Singh, S Ahuja, BC Choudhary, P Gupta, S Jain, A Kumar, A Kumar, M Naimuddin, K Ranjan, RK Shivpuri, S Banerjee, S Bhattacharya, S Dutta, B Gomber, S Jain, R Khurana, S Sarkar, RK Choudhury, D Dutta, S Kailas, V Kumar, P Mehta, AK Mohanty, LM Pant, P Shukla, T Aziz, M Guchait, A Gurtu, M Maity, D Majumder, G Majumder, K Mazumdar, GB Mohanty, A Saha, K Sudhakar, N Wickramage, S Banerjee, S Dugad, NK Mondal, H Arfaei, H Bakhshiansohi, SM Etesami, A Fahim, M Hashemi, H Hesari, A Jafari, M Khakzad, A Mohammadi, M Mohammadi Najafabadi, S 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Shin, V Timciuc, P Traczyk, J Veverka, R Wilkinson, Y Yang, RY Zhu, B Akgun, R Carroll, T Ferguson, Y Iiyama, DW Jang, SY Jun, YF Liu, M Paulini, J Russ, H Vogel, I Vorobiev, JP Cumalat, ME Dinardo, BR Drell, CJ Edelmaier, WT Ford, A Gaz, B Heyburn, E Luiggi Lopez, U Nauenberg, JG Smith, K Stenson, KA Ulmer, SR Wagner, SL Zang, L Agostino, J Alexander, D Cassel, A Chatterjee, N Eggert, LK Gibbons, B Heltsley, K Henriksson, W Hopkins, A Khukhunaishvili, B Kreis, G Nicolas Kaufman, JR Patterson, D Puigh, A Ryd, M Saelim, E Salvati, X Shi, W Sun, WD Teo, J Thom, J Thompson, J Vaughan, Y Weng, L Winstrom, P Wittich, A Biselli, G Cirino, D Winn, S Abdullin, M Albrow, J Anderson, G Apollinari, M Atac, JA Bakken, LAT Bauerdick, A Beretvas, J Berryhill, PC Bhat, I Bloch, F Borcherding, K Burkett, JN Butler, V Chetluru, HWK Cheung, F Chlebana, S Cihangir, W Cooper, DP Eartly, VD Elvira, S Esen, I Fisk, J Freeman, Y Gao, E Gottschalk, D Green, K Gunthoti, O Gutsche, J Hanlon, RM Harris, J Hirschauer, B Hooberman, H Jensen, M Johnson, U Joshi, R Khatiwada, B Klima, K Kousouris, S Kunori, S Kwan, C Leonidopoulos, P Limon, D Lincoln, R Lipton, J Lykken, K Maeshima, JM Marraffino, D Mason, P McBride, T Miao, K Mishra, S Mrenna, Y Musienko, C Newman-Holmes, V O'Dell, R Pordes, O Prokofyev, N Saoulidou, E Sexton-Kennedy, S Sharma, WJ Spalding, L Spiegel, P Tan, L Taylor, S Tkaczyk, L Uplegger, EW Vaandering, R Vidal, J Whitmore, W Wu, F Yang, F Yumiceva, JC Yun, D Acosta, P Avery, D Bourilkov, M Chen, S Das, M De Gruttola, GP Di Giovanni, D Dobur, A Drozdetskiy, RD Field, M Fisher, Y Fu, IK Furic, J Gartner, J Hugon, B Kim, J Konigsberg, A Korytov, A Kropivnitskaya, T Kypreos, JF Low, K Matchev, G Mitselmakher, L Muniz, C Prescott, R Remington, A Rinkevicius, M Schmitt, B Scurlock, P Sellers, N Skhirtladze, M Snowball, D Wang, J Yelton, M Zakaria, V Gaultney, LM Lebolo, S Linn, P Markowitz, G Martinez, JL Rodriguez, T Adams, A Askew, J Bochenek, J Chen, B Diamond, SV Gleyzer, J Haas, S Hagopian, V Hagopian, M Jenkins, KF Johnson, H Prosper, L Quertenmont, S Sekmen, V Veeraraghavan, MM Baarmand, B Dorney, S Guragain, M Hohlmann, H Kalakhety, R Ralich, I Vodopiyanov, MR Adams, IM Anghel, L Apanasevich, Y Bai, VE Bazterra, RR Betts, J Callner, R Cavanaugh, C Dragoiu, L Gauthier, CE Gerber, DJ Hofman, S Khalatyan, GJ Kunde, F Lacroix, M Malek, C O'Brien, C Silkworth, C Silvestre, A Smoron, D Strom, N Varelas, U Akgun, EA Albayrak, B Bilki, W Clarida, F Duru, CK Lae, E McCliment, J-P Merlo, H Mermerkaya, A Mestvirishvili, A Moeller, J Nachtman, CR Newsom, E Norbeck, J Olson, Y Onel, F Ozok, S Sen, J Wetzel, T Yetkin, K Yi, BA Barnett, B Blumenfeld, A Bonato, C Eskew, D Fehling, G Giurgiu, AV Gritsan, ZJ Guo, G Hu, P Maksimovic, S Rappoccio, M Swartz, NV Tran, A Whitbeck, P Baringer, A Bean, G Benelli, O Grachov, RP Kenny Iii, M Murray, D Noonan, S Sanders, JS Wood, V Zhukova, AF Barfuss, T Bolton, I Chakaberia, A Ivanov, S Khalil, M Makouski, Y Maravin, S Shrestha, I Svintradze, Z Wan, J Gronberg, D Lange, D Wright, A Baden, M Boutemeur, SC Eno, D Ferencek, JA Gomez, NJ Hadley, RG Kellogg, M Kirn, Y Lu, AC Mignerey, K Rossato, P Rumerio, F Santanastasio, A Skuja, J Temple, MB Tonjes, SC Tonwar, E Twedt, B Alver, G Bauer, J Bendavid, W Busza, E Butz, IA Cali, M Chan, V Dutta, P Everaerts, G Gomez Ceballos, M Goncharov, KA Hahn, P Harris, Y Kim, M Klute, Y-J Lee, W Li, C Loizides, PD Luckey, T Ma, S Nahn, C Paus, D Ralph, C Roland, G Roland, M Rudolph, GSF Stephans, F Stöckli, K Sumorok, K Sung, D Velicanu, EA Wenger, S Xie, M Yang, Y Yilmaz, AS Yoon, M Zanetti, SI Cooper, P Cushman, B Dahmes, A De Benedetti, PR Dudero, G Franzoni, A Gude, J Haupt, K Klapoetke, Y Kubota, J Mans, N Pastika, V Rekovic, R Rusack, M Sasseville, A Singovsky, N Tambe, LM Cremaldi, R Godang, R Kroeger, L Perera, R Rahmat, DA Sanders, D Summers, K Bloom, S Bose, J Butt, DR Claes, A Dominguez, M Eads, J Keller, T Kelly, I Kravchenko, J Lazo-Flores, H Malbouisson, S Malik, GR Snow, U Baur, A Godshalk, I Iashvili, S Jain, A Kharchilava, A Kumar, SP Shipkowski, K Smith, J Zennamo, G Alverson, E Barberis, D Baumgartel, O Boeriu, M Chasco, S Reucroft, J Swain, D Trocino, D Wood, J Zhang, A Anastassov, A Kubik, N Odell, RA Ofierzynski, B Pollack, A Pozdnyakov, M Schmitt, S Stoynev, M Velasco, S Won, L Antonelli, D Berry, A Brinkerhoff, M Hildreth, C Jessop, DJ Karmgard, J Kolb, T Kolberg, K Lannon, W Luo, S Lynch, N Marinelli, DM Morse, T Pearson, R Ruchti, J Slaunwhite, N Valls, M Wayne, J Ziegler, B Bylsma, LS Durkin, J Gu, C Hill, P Killewald, K Kotov, TY Ling, M Rodenburg, G Williams, N Adam, E Berry, P Elmer, D Gerbaudo, V Halyo, P Hebda, A Hunt, J Jones, E Laird, D Lopes Pegna, D Marlow, T Medvedeva, M Mooney, J Olsen, P Piroué, X Quan, B Safdi, H Saka, D Stickland, C Tully, JS Werner, A Zuranski, JG Acosta, XT Huang, A Lopez, H Mendez, S Oliveros, JE Ramirez Vargas, A Zatserklyaniy, E Alagoz, VE Barnes, G Bolla, L Borrello, D Bortoletto, M De Mattia, A Everett, AF Garfinkel, L Gutay, Z Hu, M Jones, O Koybasi, M Kress, AT Laasanen, N Leonardo, C Liu, V Maroussov, P Merkel, DH Miller, N Neumeister, I Shipsey, D Silvers, A Svyatkovskiy, HD Yoo, J Zablocki, Y Zheng, P Jindal, N Parashar, C Boulahouache, KM Ecklund, FJM Geurts, BP Padley, R Redjimi, J Roberts, J Zabel, B Betchart, A Bodek, YS Chung, R Covarelli, P de Barbaro, R Demina, Y Eshaq, H Flacher, A Garcia-Bellido, P Goldenzweig, Y Gotra, J Han, A Harel, DC Miner, D Orbaker, G Petrillo, W Sakumoto, D Vishnevskiy, M Zielinski, A Bhatti, R Ciesielski, L Demortier, K Goulianos, G Lungu, S Malik, C Mesropian, O Atramentov, A Barker, D Duggan, Y Gershtein, R Gray, E Halkiadakis, D Hidas, D Hits, A Lath, S Panwalkar, R Patel, K Rose, S Schnetzer, S Somalwar, R Stone, S Thomas, G Cerizza, M Hollingsworth, S Spanier, ZC Yang, A York, R Eusebi, W Flanagan, J Gilmore, A Gurrola, T Kamon, V Khotilovich, R Montalvo, I Osipenkov, Y Pakhotin, J Pivarski, A Safonov, S Sengupta, A Tatarinov, D Toback, M Weinberger, N Akchurin, C Bardak, J Damgov, C Jeong, K Kovitanggoon, SW Lee, T Libeiro, P Mane, Y Roh, A Sill, I Volobouev, R Wigmans, E Yazgan, E Appelt, E Brownson, D Engh, C Florez, W Gabella, M Issah, W Johns, P Kurt, C Maguire, A Melo, P Sheldon, B Snook, S Tuo, J Velkovska, MW Arenton, M Balazs, S Boutle, B Cox, B Francis, J Goodell, R Hirosky, A Ledovskoy, C Lin, C Neu, R Yohay, S Gollapinni, R Harr, PE Karchin, P Lamichhane, M Mattson, C Milstène, A Sakharov, M Anderson, M Bachtis, JN Bellinger, D Carlsmith, S Dasu, J Efron, L Gray, KS Grogg, M Grothe, R Hall-Wilton, M Herndon, A Hervé, P Klabbers, J Klukas, A Lanaro, C Lazaridis, J Leonard, R Loveless, A Mohapatra, F Palmonari, D Reeder, I Ross, A Savin, WH Smith, J Swanson, M Weinberg, CMS Collaboration

Abstract:

A comparison of the relative yields of Υ resonances in the μ(+)μ(-) decay channel in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair of 2.76 TeV is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4  GeV/c and pseudorapidity below 2.4, the double ratio of the Υ(2S) and Υ(3S) excited states to the Υ(1S) ground state in Pb-Pb and pp collisions, [Υ(2S+3S)/Υ(1S)](Pb-Pb)/[Υ(2S+3S)/Υ(1S)](pp), is found to be 0.31(-0.15)(+0.19)(stat)±0.03(syst). The probability to obtain the measured value, or lower, if the true double ratio is unity, is calculated to be less than 1%.

Limits on anomalous trilinear gauge couplings in Zγ events from pp̄ collisions at √s=1.96TeV

Physical Review Letters 107:5 (2011)

Authors:

T Aaltonen, B Lvarez González, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, A Apresyan, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, B Auerbach, A Aurisano, F Azfar, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barria, P Bartos, M Bauce, G Bauer, F Bedeschi, D Beecher, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, I Bizjak, KR Bland, B Blumenfeld, A Bocci, A Bodek, D Bortoletto, J Boudreau, A Boveia, B Brau, L Brigliadori, A Brisuda, C Bromberg, E Brucken, M Bucciantonio, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, A Canepa, B Carls, D Carlsmith, R Carosi, S Carrillo, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, V Cavaliere, M Cavalli-Sforza, A Cerri, L Cerrito, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, WH Chung, YS Chung, CI Ciobanu, MA Ciocci, A Clark, G Compostella, ME Convery, J Conway, M Corbo, M Cordelli, CA Cox, DJ Cox, F Crescioli, C Cuenca Almenar, J Cuevas, R Culbertson

Abstract:

Using Zγ candidate events collected by the CDF detector at the Tevatron Collider, we search for potential anomalous (non-standard-model) couplings between the Z boson and the photon. Zγ couplings vanish at tree level and are heavily suppressed at higher orders; hence any evidence of couplings indicates new physics. Measurements are performed using data corresponding to an integrated luminosity of 4.9fb-1 in the Z→νν̄ decay channel and 5.1fb-1 in the Z→l +l- (l=μ, e) decay channels. The combination of these measurements provides the most stringent limits to date on Zγ trilinear gauge couplings. Using an energy scale of Λ=1.5TeV to allow for a direct comparison with previous measurements, we find limits on the CP-conserving parameters that describe Zγ couplings to be |h3γ,Z|<0.022 and |h4γ,Z|<0.0009. These results are consistent with standard model predictions. © 2011 American Physical Society.

Galaxy Zoo: dust and molecular gas in early-type galaxies with prominent dust lanes

ArXiv 1107.5306 (2011)

Authors:

Sugata Kaviraj, Yuan-Sen Ting, Martin Bureau, Stanislav S Shabala, R Mark Crockett, Joseph Silk, Chris Lintott, Arfon Smith, William C Keel, Karen L Masters, Kevin Schawinski, Steven P Bamford

Abstract:

We study dust and associated molecular gas in 352 nearby early-type galaxies (ETGs) with prominent dust lanes. 65% of these `dusty ETGs' (D-ETGs) are morphologically disturbed, suggesting a merger origin. This is consistent with the D-ETGs residing in lower density environments compared to the controls drawn from the general ETG population. 80% of D-ETGs inhabit the field (compared to 60% of the controls) and <2% inhabit clusters (compared to 10% of the controls). Compared to the controls, D-ETGs exhibit bluer UV-optical colours (indicating enhanced star formation) and an AGN fraction that is more than an order of magnitude greater (indicating higher incidence of nuclear activity). The clumpy dust mass residing in large-scale features is estimated, using the SDSS r-band images, to be 10^{4.5}-10^{6.5} MSun. A comparison to the total (clumpy + diffuse) dust masses- calculated using the far-IR fluxes of 15% of the D-ETGs that are detected by the IRAS- indicates that only ~20% of the dust resides in these large-scale features. The dust masses are several times larger than the maximum value expected from stellar mass loss, ruling out an internal origin. The dust content shows no correlation with the blue luminosity, indicating that it is not related to a galactic scale cooling flow. No correlation is found with the age of the recent starburst, suggesting that the dust is accreted directly in the merger rather than being produced in situ by the triggered star formation. Using molecular gas-to-dust ratios of ETGs in the literature we estimate that the median current and initial molecular gas fraction are ~1.3% and ~4%, respectively. Recent work suggests that the merger activity in nearby ETGs largely involves minor mergers (mass ratios between 1:10 and 1:4). If the IRAS-detected D-ETGs form via this channel, then the original gas fractions of the accreted satellites are 20%-44%. [Abridged]

Galaxy Zoo: dust lane early-type galaxies are tracers of recent, gas-rich minor mergers

ArXiv 1107.531 (2011)

Authors:

Stanislav S Shabala, Yuan-Sen Ting, Sugata Kaviraj, Chris Lintott, R Mark Crockett, Joseph Silk, Marc Sarzi, Kevin Schawinski, Steven P Bamford, Edd Edmondson

Abstract:

We present the second of two papers concerning the origin and evolution of local early-type galaxies exhibiting dust features. We use optical and radio data to examine the nature of active galactic nucleus (AGN) activity in these objects, and compare these with a carefully constructed control sample. We find that dust lane early-type galaxies are much more likely to host emission-line AGN than the control sample galaxies. Moreover, there is a strong correlation between radio and emission-line AGN activity in dust lane early-types, but not the control sample. Dust lane early-type galaxies show the same distribution of AGN properties in rich and poor environments, suggesting a similar triggering mechanism. By contrast, this is not the case for early-types with no dust features. These findings strongly suggest that dust lane early-type galaxies are starburst systems formed in gas-rich mergers. Further evidence in support of this scenario is provided by enhanced star formation and black hole accretion rates in these objects. Dust lane early-types therefore represent an evolutionary stage between starbursting and quiescent galaxies. In these objects, the AGN has already been triggered but has not as yet completely destroyed the gas reservoir required for star formation.

The unusual radio transient in M82: an SS 433 analogue?

(2011)

Authors:

Tana Joseph, Thomas Maccarone, Robert Fender