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http://hdl.handle.net/20.500.12386/30330
Title: | Chandra centres for COSMOS X-ray galaxy groups: differences in stellar properties between central dominant and offset brightest group galaxies | Authors: | Gozaliasl, Ghassem Finoguenov, Alexis Tanaka, Masayuki Dolag, Klaus Montanari, Francesco Kirkpatrick, Charles C. Vardoulaki, Eleni Khosroshahi, Habib G. Salvato, Mara Laigle, Clotilde McCracken, Henry J. Ilbert, Olivier CAPPELLUTI, Nico Daddi, Emanuele Hasinger, Guenther Capak, Peter Scoville, Nick Z. Toft, Sune Civano, Francesca Griffiths, Richard E. Balogh, Michael Li, Yanxia Ahoranta, Jussi Mei, Simona IOVINO, Angela Henriques, Bruno M. B. Erfanianfar, Ghazaleh |
Issue Date: | 2019 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 483 | Issue: | 3 | First Page: | 3545 | Abstract: | We present the results of a search for galaxy clusters and groups in the ∼2 deg^2 of the COSMOS field using all available X-ray observations from the XMM-Newton and Chandra observatories. We reach an X-ray flux limit of 3× 10^{-16} erg cm^{-2 s}^{-1} in the 0.5-2 keV range, and identify 247 X-ray groups with M_{ 200c}=8× 10^{12}-3× 10^{14} M_{☉} at a redshift range of 0.08 ≤ z < 1.53, using the multiband photometric redshift and the master spectroscopic redshift catalogues of the COSMOS. The X-ray centres of groups are determined using high-resolution Chandra imaging. We investigate the relations between the offset of the brightest group galaxies (BGGs) from halo X-ray centre and group properties and compare with predictions from semi-analytic models and hydrodynamical simulations. We find that BGG offset decreases with both increasing halo mass and decreasing redshift with no strong dependence on the X-ray flux and SNR. We show that the BGG offset decreases as a function of increasing magnitude gap with no considerable redshift-dependent trend. The stellar mass of BGGs in observations extends over a wider dynamic range compared to model predictions. At z < 0.5, the central dominant BGGs become more massive than those with large offsets by up to 0.3 dex, in agreement with model prediction. The observed and predicted log-normal scatter in the stellar mass of both low- and large-offset BGGs at fixed halo mass is ∼0.3 dex. | URI: | http://hdl.handle.net/20.500.12386/30330 | URL: | https://academic.oup.com/mnras/article/483/3/3545/5211093?login=true | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty3203 | Bibcode ADS: | 2019MNRAS.483.3545G | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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sty3203-compr.pdf | PDF editoriale | 1.53 MB | Adobe PDF | View/Open |
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