2016ApJ...833..178V -
Astrophys. J., 833, 178-178 (2016/December-3)
The Grism Lens-Amplified Survey from Space (GLASS). VII. The diversity of the distribution of star formation in cluster and field galaxies at 0.3 <= z <= 0.7.
VULCANI B., TREU T., SCHMIDT K.B., MORISHITA T., DRESSLER A., POGGIANTI B.M., ABRAMSON L., BRADAC M., BRAMMER G.B., HOAG A., MALKAN M., PENTERICCI L. and TRENTI M.
Abstract (from CDS):
Exploiting the slitless spectroscopy taken as part of the Grism Lens-Amplified Survey from Space (GLASS), we present an extended analysis of the spatial distribution of star formation in 76 galaxies in 10 clusters at 0.3<z<0.7. We use 85 foreground and background galaxies in the same redshift range as a field sample. The samples are well matched in stellar mass (108-1011 M☉) and star formation rate (0.5-50 M☉ yr–1). We visually classify galaxies in terms of broad band morphology, Hα morphology, and likely physical process acting on the galaxy. Most Hα emitters have a spiral morphology (41% ± 8% in clusters, 51% ± 8% in the field), followed by mergers/interactions (28% ± 8%, 31% ± 7%, respectively) and early-type galaxies (remarkably as high as 29% ± 8% in clusters and 15% ± 6% in the field). A diversity of Hα morphologies is detected, suggesting a diversity of physical processes. In clusters, 30% ± 8% of the galaxies present a regular morphology, mostly consistent with star formation diffused uniformly across the stellar population (mostly in the disk component, when present). The second most common morphology (28% ± 8%) is asymmetric/jellyfish, consistent with ram-pressure stripping or other non-gravitational processes in 18% ± 8% of the cases. Ram-pressure stripping appears significantly less prominent in the field (2% ± 2%), where the most common morphology/mechanism appears to be consistent with minor gas-rich mergers or clump accretion. This work demonstrates that while environment-specific mechanisms affect galaxy evolution at this redshift, they are diverse and their effects are subtle. A full understanding of this complexity requires larger samples and detailed and spatially resolved physical models.
Abstract Copyright:
© 2016. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: clusters: general - galaxies: evolution - galaxies: formation - galaxies: general - galaxies: star formation - galaxies: star formation
VizieR on-line data:
<Available at CDS (J/ApJ/833/178): table1.dat table3.dat>
Nomenclature:
[TSB2015] GLASS ANNNN-NNNNN, [TSB2015] GLASS RXJHHMM-NNNNN, [TSB2015] GLASS MACSHHMM-NNNNN, N=162.
Simbad objects:
172
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