The SAURON project - XVIII. The integrated UV-line-strength relations of early-type galaxies

Monthly Notices of the Royal Astronomical Society 414:3 (2011) 1887-1902

Authors:

M Bureau, H Jeong, SK Yi, K Schawinski, RCW Houghton, RL Davies, R Bacon, M Cappellari, PT de Zeeuw, E Emsellem, J Falc贸n-Barroso, D Krajnovi膰, H Kuntschner, RM McDermid, RF Peletier, M Sarzi, YJ Sohn, D Thomas, RCE van den Bosch, G van de Ven

Abstract:

Using far-ultraviolet (FUV) and near-ultraviolet (NUV) photometry from guest investigator programmes on the Galaxy Evolution Explorer (GALEX) satellite, optical photometry from the MDM Observatory and optical integral-field spectroscopy from SAURON, we explore the UV-line-strength relations of the 48 nearby early-type galaxies in the SAURON sample. Identical apertures are used for all quantities, avoiding aperture mismatch. We show that galaxies with purely old stellar populations show well-defined correlations of the integrated FUV -V and FUV - NUV colours with the integrated Mg b and H尾 absorption line-strength indices, strongest for FUV - NUV. Correlations with the NUV -V colour, Fe5015 index and stellar velocity dispersion 蟽 are much weaker. These correlations put stringent constraints on the origin of the UV-upturn phenomenon in early-type galaxies and highlight its dependence on age and metallicity. In particular, despite recent debate, we recover the negative correlation between FUV -V colour and Mg line strength originally publicized by Burstein et al., which we refer to as the 'Burstein relation', suggesting a positive dependence of the UV upturn on metallicity. We argue that the scatter in the correlations is real and present mild evidence that a strong UV excess is preferentially present in slow-rotating galaxies. We also demonstrate that most outliers in the correlations are galaxies with current or recent star formation, some at very low levels. We believe that this sensitivity to weak star formation, afforded by the deep and varied data available for the SAURON sample, explains why our results are occasionally at odds with other recent but shallower surveys. This is supported by the analysis of a large, carefully crafted sample of more distant early-type galaxies from the Sloan Digital Sky Survey (SDSS), more easily comparable with current and future large surveys. 漏 2011 The Authors Monthly Notices of the Royal Astronomical Society 漏 2011 RAS.

The dependence of star formation activity on environment and stellar mass at z鈭 1 from the HiZELS-H伪 survey

Monthly Notices of the Royal Astronomical Society 411:1 (2011) 675-692

Authors:

D Sobral, PN Best, I Smail, JE Geach, M Cirasuolo, T Garn, GB Dalton

Abstract:

This paper presents an environment and stellar mass study of a large sample of star-forming H伪 emitters at z= 0.84 from the High-z Emission Line Survey (HiZELS), over 1.3 deg2 split over two fields (COSMOS and UKIDSS UDS). By taking advantage of a truly panoramic coverage of a wide range of environments, from the field to a rich cluster, it is shown that both stellar mass and environment play crucial roles in determining the properties of star-forming galaxies. Specific star formation rates (sSFRs) decline with stellar mass in all environments, and the fraction of H伪 star-forming galaxies declines sharply from 鈮40 per cent for galaxies with masses around 1010M鈯 to effectively zero above 1011.5M鈯, confirming that mass-downsizing is generally in place by z鈭 1. The fraction of star-forming galaxies is also found to fall sharply as a function of local environmental density from 鈮40 per cent in the field to approaching zero at rich group/cluster densities. When star formation does occur in such high density regions, it is found to be mostly dominated by potential mergers and, indeed, if only non-merging star-forming galaxies are considered, then the environment and mass trends are even stronger and are qualitatively similar at all masses and environments, respectively, as in the local Universe. The median SFR of H伪 emitters at z= 0.84 is found to increase with density for both field and intermediate (group or cluster outskirts) densities; this is clearly seen as a change in the faint-end slope of the H伪 luminosity function from steep (伪鈮-1.9), in poor fields, to shallow (伪鈮-1.1) in groups and clusters. Interestingly, the relation between median SFR and environment is only found for low- to moderate-mass galaxies (with stellar masses below about 1010.6M鈯), and is not seen for the most massive star-forming galaxies. Overall, these observations provide a detailed view over a sufficiently large range of mass and environment to reconcile previous observational claims: stellar mass is the primary predictor of star formation activity at z鈭 1, but the environment, while initially enhancing the median SFR of (lower mass) star-forming galaxies, is ultimately responsible for suppressing star formation activity in all galaxies above surface densities of 10-30 Mpc-2 (group and cluster environments). 漏 2010 The Authors. Journal compilation 漏 2010 RAS.

The planetary nebulae population in the central regions of M32: The SAURON view

Monthly Notices of the Royal Astronomical Society 415:3 (2011) 2832-2843

Authors:

M Sarzi, GA Mamon, M Cappellari, E Emsellem, R Bacon, RL Davies, P Tim de Zeeuw

Abstract:

Extragalactic planetary nebulae (PNe) are not only useful as distance signposts or as tracers of the dark matter content of their host galaxies, but constitute also good indicators of the main properties of their parent stellar populations. Yet, so far, the properties of PNe in the optical regions of galaxies where stellar population gradients can be more extreme have remained largely unexplored, mainly because the detection of PNe with narrow-band imaging or slitless spectroscopy is considerably hampered by the presence of a strong stellar background. Integral field spectroscopy (IFS) can overcome this limitation, and here we present a study of the PN population in the nearby compact elliptical M32. Using SAURON data taken with just two 10-min-long pointings we have doubled the number of known PNe within the effective radius of M32, detecting PNe five times fainter than previously found in narrow-band images that collected nearly the same number of photons. We have carefully assessed the incompleteness limit of our survey, and accounting for it across the entire range of luminosity values spanned by our detected PNe, we could conclude despite having at our disposal only 15 sources that the central PNe population of M32 is consistent with the generally adopted shape for the PNe Luminosity Function and its typical normalization observed in early-type galaxies. Furthermore, owing to the proximity of M32 and to ultraviolet images taken with the Hubble Space Telescope, we could identify the most likely candidates for the central star of a subset of our detected PNe and conclude that these stars are affected by substantial amounts of circumstellar dust extinction, a finding that could reconcile the intriguing discrepancy previously reported in M32 between the model predictions and the observations for the later stages of stellar evolution. Considering the modest time investment on a 4-m-class telescope that delivered these results, this study illustrates the potential of future IFS investigations for the central PNe population of early-type galaxies, either with existing SAURON data for many more, albeit more distant, objects, or from campaigns that will use the future generations of integral field spectrographs that will be mounted on 8-m-class telescopes, such as MUSE on the Very Large Telescope. 漏 2011 The Authors Monthly Notices of the Royal Astronomical Society 漏 2011 RAS.

A parametric physical model for the intracluster medium and its use in joint SZ/X-ray analyses of galaxy clusters

\mnras 410 (2011) 341-358

Authors:

JR Allison, AC Taylor, ME Jones, S Rawlings, ST Kay

Search for quark contact interactions in dijet angular distributions in pp collisions at s=7 TeV measured with the ATLAS detector

Physics Letters B Elsevier 694:4-5 (2011) 327-345

Authors:

ATLAS Collaboration, G Aad, B Abbott, J Abdallah, AA Abdelalim, A Abdesselam, O Abdinov, B Abi, M Abolins, H Abramowicz, H Abreu, E Acerbi, BS Acharya, M Ackers, DL Adams, TN Addy, J Adelman, M Aderholz, S Adomeit, C Adorisio, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, H Ahmed, M Ahsan, G Aielli, T Akdogan, TPA 脜kesson, G Akimoto, AV Akimov, A Aktas, MS Alam, MA Alam, S Albrand, M Aleksa, IN Aleksandrov, M Aleppo, 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, J Alonso, MG Alviggi, K Amako, P Amaral, G Ambrosio, C Amelung, VV Ammosov, A Amorim, G Amor贸s, N Amram, C Anastopoulos, T Andeen, CF Anders, KJ Anderson, A Andreazza, V Andrei, M-L Andrieux, XS Anduaga, A Angerami, F Anghinolfi, N Anjos, A Annovi, A Antonaki, M Antonelli, S Antonelli, J Antos, B Antunovic, F Anulli, S Aoun, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, JP Archambault, S Arfaoui, J-F Arguin, T Argyropoulos, E Arik, M Arik, AJ Armbruster, KE Arms, SR Armstrong, O Arnaez, C Arnault, A Artamonov, D Arutinov, M Asai, S Asai, R Asfandiyarov, S Ask, B 脜sman, D Asner, 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, E Badescu, P Bagnaia, Y Bai, DC Bailey, T Bain, JT Baines, OK Baker, MD Baker, S Baker, F Baltasar Dos Santos Pedrosa, E Banas, P Banerjee, Sw Banerjee, D Banfi, A Bangert, V Bansal, SP Baranov, S 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, M Barone, AJ Barr, F Barreiro, J Barreiro Guimar茫es da Costa, P Barrillon, R Bartoldus, D Bartsch, RL Bates, L Batkova, JR Batley, A Battaglia, M Battistin, G Battistoni, F Bauer, HS Bawa, M Bazalova, B Beare, T Beau, PH Beauchemin, R Beccherle, P Bechtle, GA Beck, HP Beck, M Beckingham, KH Becks, AJ Beddall, A Beddall, VA Bednyakov, C Bee, M Begel, S Behar Harpaz, PK Behera, M Beimforde, C Belanger-Champagne, B Belhorma, PJ Bell, WH Bell, G Bella, L Bellagamba, F Bellina, G Bellomo, M Bellomo, A Belloni, K Belotskiy, O Beltramello, S Ben Ami, O Benary, D Benchekroun, C Benchouk, M Bendel, BH Benedict, N Benekos, Y Benhammou, GP Benincasa, DP Benjamin, M Benoit, JR Bensinger, K Benslama, S Bentvelsen, M Beretta, 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, S Bertolucci, MI Besana, N Besson, S Bethke, W Bhimji, RM Bianchi, M Bianco, O Biebel, J Biesiada, M Biglietti, H Bilokon, M Binder, M Bindi, S Binet, A Bingul, C Bini, C Biscarat, R Bischof, U Bitenc, KM Black, RE Blair, J-B Blanchard, G Blanchot, C Blocker, J Blocki, A Blondel, W Blum, U Blumenschein, C Boaretto, GJ Bobbink, A Bocci, D Bocian, R Bock, CR Boddy, M Boehler, J Boek, N Boelaert, S B枚ser, JA Bogaerts, A Bogouch, C Bohm, J Bohm, V Boisvert, T Bold, V Boldea, VG Bondarenko, M Bondioli, M Boonekamp, G Boorman, CN Booth, P Booth, JRA 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 Boulahouache, C Bourdarios, A Boveia, J Boyd, IR Boyko, NI Bozhko, I Bozovic-Jelisavcic, S Braccini, J Bracinik, A Braem, E Brambilla, 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, ND Brett, PG Bright-Thomas, D Britton, FM Brochu, I Brock, R Brock, TJ Brodbeck, E Brodet, F Broggi, C Bromberg, G Brooijmans, WK Brooks, G Brown, E Brubaker, 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, IA Budagov, B Budick, V B眉scher, L Bugge, D Buira-Clark, EJ Buis, 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, T Byatt, J Caballero, S Cabrera Urb谩n, M Caccia, D Caforio, O Cakir, P Calafiura, G Calderini, P Calfayan, R Calkins, LP Caloba, R Caloi, D Calvet, S Calvet, A Camard, P Camarri, M Cambiaghi, D Cameron, J Cammin, S Campana, M Campanelli, V Canale, F Canelli, A Canepa, J Cantero, L Capasso, MDM Capeans Garrido, I Caprini, M Caprini, M Caprio, D Capriotti, M Capua, R Caputo, C Caramarcu, R Cardarelli, T Carli, G Carlino, L Carminati, B Caron, S Caron, C Carpentieri, GD Carrillo Montoya, S Carron Montero, 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, A Cavallari, P Cavalleri, D Cavalli, M Cavalli-Sforza, V Cavasinni, A Cazzato, F Ceradini, C Cerna, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, M Cervetto, SA Cetin, F Cevenini, A Chafaq, D Chakraborty, K Chan, JD Chapman, JW Chapman, E Chareyre, DG Charlton, V Chavda, S Cheatham, S Chekanov, SV Chekulaev, GA Chelkov, H Chen, L Chen, S Chen, T Chen, X Chen, S Cheng, A Cheplakov, VF Chepurnov, R Cherkaoui El Moursli, V Tcherniatine, D Chesneanu, E Cheu, SL Cheung, L Chevalier, F Chevallier, V Chiarella, 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, AK Ciftci, R Ciftci, D Cinca, V Cindro, MD Ciobotaru, C Ciocca, A Ciocio, M Cirilli, M Citterio, A Clark, PJ Clark, W Cleland, JC Clemens, B Clement, C Clement, RW Clifft, Y Coadou, M Cobal, A Coccaro, J Cochran, P Coe, S Coelli, J Coggeshall, E Cogneras, CD Cojocaru, J Colas, B Cole, AP Colijn, C Collard, NJ Collins, C Collins-Tooth, J Collot, G Colon, R Coluccia, G Comune, P Conde Mui帽o, E Coniavitis, MC Conidi, M Consonni, S Constantinescu, C Conta, F Conventi, J Cook, M Cooke, BD Cooper, AM Cooper-Sarkar, NJ Cooper-Smith, K Copic, T Cornelissen, M Corradi, S Correard, F Corriveau, A Corso-Radu, A Cortes-Gonzalez, G Cortiana, G Costa, MJ Costa, D Costanzo, T Costin, D C么t茅, R Coura Torres, L Courneyea, G Cowan, C Cowden, BE Cox, K Cranmer, J Cranshaw, M Cristinziani, G Crosetti, R Crupi, S Cr茅p茅-Renaudin, C Cuenca Almenar, T Cuhadar Donszelmann, S Cuneo, M Curatolo, CJ Curtis, P Cwetanski, H Czirr, Z Czyczula, S D'Auria, M D'Onofrio, A D'Orazio, A Da Rocha Gesualdi Mello, PVM Da Silva, C Da Via, W Dabrowski, A Dahlhoff, T Dai, C Dallapiccola, SJ Dallison, CH Daly, M Dam, M Dameri, DS Damiani, HO Danielsson, R Dankers, D Dannheim, V Dao, G Darbo, GL Darlea, C Daum, JP Dauvergne, W Davey, T Davidek, N Davidson, R Davidson, M Davies, AR Davison, 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, E De La Cruz-Burelo, C De La Taille, B De Lotto, L De Mora, L De Nooij, M De Oliveira Branco, D De Pedis, P de Saintignon, A De Salvo, U De Sanctis, A De Santo, JB De Vivie De Regie, G De Zorzi, S Dean, G Dedes, DV Dedovich, PO Defay, J Degenhardt, M Dehchar, M Deile, C Del Papa, J Del Peso, T Del Prete, 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, W Deng, SP Denisov, C Dennis, JE Derkaoui, F Derue, P Dervan, K Desch, PO Deviveiros, A Dewhurst, B DeWilde, S Dhaliwal, R Dhullipudi, A Di Ciaccio, L Di Ciaccio, A Di Domenico, A Di Girolamo, B Di Girolamo, S Di Luise, A Di Mattia, R Di Nardo, A Di Simone, R Di Sipio, MA Diaz, MM Diaz Gomez, F Diblen, EB Diehl, H Dietl, J Dietrich, TA Dietzsch, S Diglio, K Dindar Yagci, J Dingfelder, C Dionisi, P Dita, S Dita, F Dittus, F Djama, R Djilkibaev, T Djobava, MAB do Vale, A Do Valle Wemans, TKO Doan, M Dobbs, R Dobinson, D Dobos, E Dobson, M Dobson, J Dodd, OB Dogan, 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, A Doxiadis, AT Doyle, Z Drasal, J Drees, N Dressnandt, H Drevermann, C Driouichi, M Dris, JG Drohan, J Dubbert, T Dubbs, S Dube, E Duchovni, G Duckeck, A Dudarev, F Dudziak, M D眉hrssen, IP Duerdoth, L Duflot, M-A Dufour, M Dunford, H Duran Yildiz, A Dushkin, R Duxfield, M Dwuznik, F Dydak, D Dzahini, M D眉ren, WL Ebenstein, J Ebke, S Eckert, S Eckweiler, K Edmonds, CA Edwards, I Efthymiopoulos, K Egorov, 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, R Ely, D Emeliyanov, R Engelmann, A Engl, B Epp, A Eppig, J Erdmann, A Ereditato, D Eriksson, I Ermoline, 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, VN Evdokimov, L Fabbri, C Fabre, K Facius, RM Fakhrutdinov, S Falciano, AC Falou, Y Fang, M Fanti, A Farbin, A Farilla, J Farley, T Farooque, SM Farrington, P Farthouat, D Fasching, P Fassnacht, D Fassouliotis, B Fatholahzadeh, L Fayard, S Fazio, R Febbraro, P Federic, OL Fedin, I Fedorko, W Fedorko, M Fehling-Kaschek, L Feligioni, CU Felzmann, C Feng, EJ Feng, AB Fenyuk, J Ferencei, D Ferguson, J Ferland, B Fernandes, 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, F Ferro, M Fiascaris, F Fiedler, A Filip膷i膷, A Filippas, F Filthaut, M Fincke-Keeler, MCN Fiolhais, L Fiorini, A Firan, G Fischer, P Fischer, MJ Fisher, SM Fisher, J Flammer, M Flechl, I Fleck, J Fleckner, P Fleischmann, S Fleischmann, T Flick, LR Flores Castillo, MJ Flowerdew, F F枚hlisch, M Fokitis, T Fonseca Martin, J Fopma, 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, M Franklin, S Franz, M Fraternali, S Fratina, J Freestone, ST French, 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, M Garcia-Sciveres, C Garc铆a, JE Garc铆a Navarro, RW Gardner, N Garelli, H Garitaonandia, V Garonne, J Garvey, C Gatti, G Gaudio, O Gaumer, B Gaur, V Gautard, P Gauzzi, IL Gavrilenko, C Gay, G Gaycken, J-C Gayde, EN Gazis, P Ge, CNP Gee, Ch Geich-Gimbel, K Gellerstedt, C Gemme, MH Genest, S Gentile, F Georgatos, 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, GF Gieraltowski, LM Gilbert, M Gilchriese, O Gildemeister, V Gilewsky, D Gillberg, AR Gillman, DM Gingrich, J Ginzburg, N Giokaris, MP Giordani, R Giordano, FM Giorgi, P Giovannini, PF Giraud, P Girtler, D Giugni, P Giusti, BK Gjelsten, LK Gladilin, C Glasman, J Glatzer, A Glazov, KW Glitza, GL Glonti, KG Gnanvo, J Godfrey, J Godlewski, M Goebel, T G枚pfert, C Goeringer, C G枚ssling, T G枚ttfert, V Goggi, S Goldfarb, D Goldin, T Golling, NP Gollub, SN Golovnia, A Gomes, LS Gomez Fajardo, R Gon莽alo, L Gonella, C Gong, A Gonidec, S Gonzalez, S Gonz谩lez de la Hoz, ML Gonzalez Silva, B Gonzalez-Pineiro, S Gonzalez-Sevilla, JJ Goodson, L Goossens, PA Gorbounov, HA Gordon, I Gorelov, G Gorfine, B Gorini, E Gorini, A Gori拧ek, E Gornicki, SA Gorokhov, BT Gorski, VN Goryachev, B Gosdzik, M Gosselink, MI Gostkin, M Gouan猫re, I Gough Eschrich, M Gouighri, D Goujdami, MP Goulette, AG Goussiou, C Goy, I Grabowska-Bold, V Grabski, P Grafstr枚m, C Grah, K-J Grahn, F Grancagnolo, S Grancagnolo, V Grassi, V Gratchev, N Grau, HM Gray, JA Gray, E Graziani, OG Grebenyuk, B Green, D Greenfield, T Greenshaw, ZD Greenwood, IM Gregor, P Grenier, A Grewal, E Griesmayer, J Griffiths, N Grigalashvili, AA Grillo, K Grimm, S Grinstein, YV Grishkevich, J-F Grivaz, LS Groer, J Grognuz, M Groh, E Gross, J Grosse-Knetter, J Groth-Jensen, M Gruwe, K Grybel, VJ Guarino, C Guicheney, A Guida, T Guillemin, S Guindon, H Guler, J Gunther, B 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, G Haboubi, R Hackenburg, HK Hadavand, DR Hadley, C Haeberli, P Haefner, R H盲rtel, F Hahn, S Haider, Z Hajduk, H Hakobyan, J Haller, GD Hallewell, K Hamacher, A Hamilton, S Hamilton, H Han, L Han, K Hanagaki, M Hance, C Handel, P Hanke, CJ Hansen, JR Hansen, JB Hansen, JD Hansen, PH Hansen, T Hansl-Kozanecka, P Hansson, K Hara, GA Hare, T Harenberg, R Harper, RD Harrington, OM Harris, K Harrison, JC Hart, J Hartert, F Hartjes, T Haruyama, A Harvey, S Hasegawa, Y Hasegawa, K Hashemi, S Hassani, M Hatch, D Hauff, S Haug, M Hauschild, R Hauser, M Havranek, BM Hawes, CM Hawkes, RJ Hawkings, D Hawkins, T Hayakawa, HS Hayward, SJ Haywood, E Hazen, M He, SJ Head, V Hedberg, L Heelan, S Heim, B Heinemann, S Heisterkamp, L Helary, M Heldmann, M Heller, S Hellman, C Helsens, T Hemperek, RCW Henderson, PJ Hendriks, M Henke, A Henrichs, AM Henriques Correia, S Henrot-Versille, F Henry-Couannier, C Hensel, T Hen脽, Y Hern谩ndez Jim茅nez, AD Hershenhorn, G Herten, R Hertenberger, L Hervas, NP Hessey, A Hidvegi, E Hig贸n-Rodriguez, D Hill, JC Hill, N Hill, KH Hiller, S Hillert, SJ Hillier, I Hinchliffe, D Hindson, 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, TI Hollins, A Holmes, SO Holmgren, T Holy, JL Holzbauer, RJ Homer, Y Homma, T Horazdovsky, C Horn, S Horner, K Horton, J-Y Hostachy, T Hott, S Hou, MA Houlden, A Hoummada, DF Howell, 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, T Isobe, C Issever, S Istin, Y Itoh, AV Ivashin, W Iwanski, H Iwasaki, JM Izen, V Izzo, B Jackson, JN Jackson, P Jackson, MR Jaekel, M Jahoda, V Jain, K Jakobs, S Jakobsen, J Jakubek, DK Jana, E Jankowski, E Jansen, A Jantsch, M Janus, 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Abstract:

Dijet angular distributions from the first LHC pp collisions at center-of-mass energy s=7聽TeV have been measured with the ATLAS detector. The dataset used for this analysis represents an integrated luminosity of 3.1聽pb鈭1. Dijet 蠂 distributions and centrality ratios have been measured up to dijet masses of 2.8 TeV, and found to be in good agreement with Standard Model predictions. Analysis of the 蠂 distributions excludes quark contact interactions with a compositeness scale 螞 below 3.4 TeV, at 95% confidence level, significantly exceeding previous limits.