Journal
ASTROPHYSICAL JOURNAL
Volume 776, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/776/2/72
Keywords
galaxies: evolution; galaxies: groups: general; galaxies: structure; surveys
Categories
Funding
- Swiss National Science Foundation
- ESO Large Program [177.A-0680]
- National Aeronautics and Space Administration
- National Science Foundation
- STFC [ST/I001166/1, ST/I00162X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001166/1, ST/I00162X/1] Funding Source: researchfish
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We present structural measurements for the galaxies in the 0.05 < z < 0.0585 groups of the Zurich Environmental Study, aimed at establishing how galaxy properties depend on four environmental parameters: group halo mass (M-GROUP), group-centric distance (R/R-200), ranking into central or satellite, and large-scale structure density (delta(LSS)). Global galaxy structure is quantified both parametrically and non-parametrically. We correct all these measurements for observational biases due to point-spread function blurring and surface brightness effects as a function of galaxy size, magnitude, steepness of light profile, and ellipticity. Structural parameters are derived also for bulges, disks, and bars. We use the galaxy bulge-to-total ratios (B/T) together with the calibrated non-parametric structural estimators to implement a quantitative morphological classification that maximizes purity in the resulting morphological samples. We investigate how the concentration C of satellite galaxies depends on galaxy mass for each Hubble type and on M-GROUP, R/R-200, and delta(LSS). At galaxy masses M >= 10(10) M-circle dot, the concentration of disk satellites increases with increasing stellar mass separately within each morphological bin of B/T. The known increase in concentration with stellar mass for disk satellites is thus due, at least in part, to an increase in galaxy central stellar density at constant B/T. The correlation between concentration and galaxy stellar mass becomes progressively steeper for later morphological types. The concentration of disk satellites shows a barely significant dependence on delta(LSS) or R/R-200. The strongest environmental effect is found with group mass for >10(10) M-circle dot disk-dominated satellites, which are similar to 10% more concentrated in high mass groups than in lower mass groups.
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