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Ultra-deep catalog of X-ray groups in the Extended Chandra Deep Field South

Finoguenov, A. and Tanaka, M. and Cooper, M. and Allevato, V. and Cappelluti, N. and Choi, A. and Heymans, C. and Bauer, F. E. and Ziparo, F. and Ranalli, P. and Silverman, J. and Brandt, W. N. and Xue, Y. Q. and Mulchaey, J. and Howes, L. and Schmid, C. and Wilman, D. and Comastri, A. and Hasinger, G. and Mainieri, V. and Luo, B. and Tozzi, P. and Rosati, P. and Capak, P. and Popesso, P. (2015) Ultra-deep catalog of X-ray groups in the Extended Chandra Deep Field South. Astronomy and Astrophysics, 576 . Art. No. A130. ISSN 0004-6361.

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Aims. We present the detection, identification and calibration of extended sources in the deepest X-ray dataset to date, the Extended Chandra Deep Field South (ECDF-S). Methods. Ultra-deep observations of ECDF-S with Chandra and XMM-Newton enable a search for extended X-ray emission down to an unprecedented flux of 2 × 10^(-16) ergs s^(-1) cm^(-2). By using simulations and comparing them with the Chandra and XMM data, we show that it is feasible to probe extended sources of this flux level, which is 10 000 times fainter than the first X-ray group catalogs of the ROSAT all sky survey. Extensive spectroscopic surveys at the VLT and Magellan have been completed, providing spectroscopic identification of galaxy groups to high redshifts. Furthermore, available HST imaging enables a weak-lensing calibration of the group masses. Results. We present the search for the extended emission on spatial scales of 32′′ in both Chandra and XMM data, covering 0.3 square degrees and model the extended emission on scales of arcminutes. We present a catalog of 46 spectroscopically identified groups, reaching a redshift of 1.6. We show that the statistical properties of ECDF-S, such as log  N − log  S and X-ray luminosity function are broadly consistent with LCDM, with the exception that dn/dz/dΩ test reveals that a redshift range of 0.2 < z < 0.5 in ECDF-S is sparsely populated. The lack of nearby structure, however, makes studies of high-redshift groups particularly easier both in X-rays and lensing, due to a lower level of clustered foreground. We present one and two point statistics of the galaxy groups as well as weak-lensing analysis to show that the detected low-luminosity systems are indeed low-mass systems. We verify the applicability of the scaling relations between the X-ray luminosity and the total mass of the group, derived for the COSMOS survey to lower masses and higher redshifts probed by ECDF-S by means of stacked weak lensing and clustering analysis, constraining any possible departures to be within 30% in mass. Conclusions. Ultra-deep X-ray surveys uniquely probe the low-mass galaxy groups across a broad range of redshifts. These groups constitute the most common environment for galaxy evolution. Together with the exquisite data set available in the best studied part of the Universe, the ECDF-S group catalog presented here has an exceptional legacy value.

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Additional Information:© 2015 ESO. Article published by EDP Sciences. Received 14 November 2013; Accepted 31 January 2015; Published online 17 April 2015. This work has been partially supported through a SAO grant SP1-12006B to UMBC. W.N.B. thanks Chandra grant SP1-12007A and NASA ADP grant NNX10AC99G. A.F. and V.A. wish to acknowledge Finnish Academy award, decision 266918. M.T. acknowledges support by KAKENHI No. 23740144. P.R. acknowledges a grant from the Greek General Secretariat of Research and Technology in the framework of the programme Support of Postdoctoral Researchers. A.C. and C.H. acknowledge support from the European Research Council under the EC FP7 grant number 240185. J.S.M. acknowledges partial support from Chandra grant SP1-12006A. C.S. acknowledges support by DLR grants 50QR1103 and 50QR0803. Y.Q.X. acknowledges support of the Thousand Young Talents program (KJ2030220004), the 973 Program (2015CB857004), the USTC startup funding (ZC9850290195), the National Natural Science Foundation of China (NSFC-11473026, 11421303), and the Strategic Priority Research Program “The Emergence of Cosmological Structures” of the Chinese Academy of Sciences (XDB09000000). F.E.B. acknowledges support from Basal-CATA PFB-06/2007, CONICYT-Chile (FONDECYT 1141218, ALMA-CONICYT 31100004, Gemini-CONICYT 32120003, “EMBIGGEN” Anillo ACT1101), and Project IC120009 “Millennium Institute of Astrophysics (MAS)” of Iniciativa Científica Milenio del Ministerio de Economía, Fomento y Turismo.
Funding AgencyGrant Number
Smithsonian Astrophysical Observatory (SAO)SP1-12006B
Chandra X-ray Center grantSP1-12007A
Academy of Finland266918
Japan Society for the Promotion of Science (JSPS)23740144
Greek General Secretariat of Research and TechnologyUNSPECIFIED
European Research Council EC FP7240185
Chandra X-ray Center grantSP1-12006A
Deutsches Zentrum für Luft- und Raumfahrt (DLR)50QR1103
Deutsches Zentrum für Luft- und Raumfahrt (DLR)50QR0803
Thousand Young Talents programKJ2030220004
National Basic Research Program of China 973 Program2015CB857004
National Natural Science Foundation of China11473026
National Natural Science Foundation of China11421303
Chinese Academy of SciencesXDB09000000
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1141218
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)31100004
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)32120003
Iniciativa Científica Milenio (ICM) del Ministerio de EconomíaIC120009
Subject Keywords:gravitational lensing: weak; X-rays: galaxies: clusters; large-scale structure of Universe
Record Number:CaltechAUTHORS:20150810-103143722
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Official Citation:A. Finoguenov, M. Tanaka, M. Cooper, V. Allevato, N. Cappelluti, A. Choi, C. Heymans, F. E. Bauer, F. Ziparo, P. Ranalli, J. Silverman, W. N. Brandt, Y. Q. Xue, J. Mulchaey, L. Howes, C. Schmid, D. Wilman, A. Comastri, G. Hasinger, V. Mainieri, B. Luo, P. Tozzi, P. Rosati, P. Capak and P. Popesso A&A 576 A130 (2015) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59351
Deposited By: Tony Diaz
Deposited On:10 Aug 2015 18:53
Last Modified:10 Aug 2015 18:53

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