Chandra centres for COSMOS X-ray galaxy groups : differences in stellar properties between central dominant and offset brightest group galaxies

Show full item record



Permalink

http://hdl.handle.net/10138/300793

Citation

Gozaliasl , G , Finoguenov , A , Tanaka , M , Dolag , K , Montanari , F , Kirkpatrick , C C , Vardoulaki , E , Khosroshahi , H G , Salvato , M , Laigle , C , McCracken , H J , Ilbert , O , Cappelluti , N , Daddi , E , Hasinger , G , Capak , P , Scoville , N Z , Toft , S , Civano , F , Griffiths , R E , Balogh , M , Li , Y , Ahoranta , J , Mei , S , Iovino , A , Henriques , B M B & Erfanianfar , G 2019 , ' Chandra centres for COSMOS X-ray galaxy groups : differences in stellar properties between central dominant and offset brightest group galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 483 , no. 3 , pp. 3545-3565 . https://doi.org/10.1093/mnras/sty3203

Title: Chandra centres for COSMOS X-ray galaxy groups : differences in stellar properties between central dominant and offset brightest group galaxies
Author: 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
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Particle Physics and Astrophysics
Date: 2019-03
Language: eng
Number of pages: 21
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/300793
Abstract: We present the results of a search for galaxy clusters and groups in the ∼2 deg2 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 M200c = 8 × 1012-3 × 1014M 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.
Subject: galaxies: clusters: general
galaxies: evolution
galaxies: groups: general
galaxies: statistics
galaxies: stellar content
X-rays: galaxies: clusters
STAR-FORMATION RATES
HALO MASS RELATION
CLUSTER GALAXIES
DARK-MATTER
PHOTOMETRIC REDSHIFTS
PLANCK COSMOLOGY
FOSSIL GROUPS
EVOLUTION
SIMULATIONS
I.
115 Astronomy, Space science
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
sty3203.pdf 11.72Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record