The effect of the environment on the structure, morphology and star formation history of intermediate-redshift galaxies
Gray, Meghan E.
Rudnick, Gregory H.
Oxford University Press
Scholarly/refereed, publisher version
© 2018 Oxford University Press.
MetadataShow full item record
With the aim of understanding the effect of the environment on the star formation history and morphological transformation of galaxies, we present a detailed analysis of the colour, morphology and internal structure of cluster and field galaxies at 0.4 ≤ z ≤ 0.8. We use the Hubble Space Telescope data for over 500 galaxies from the ESO Distant Cluster Survey to quantify how the galaxies’ light distribution deviate from symmetric smooth profiles. We visually inspect the galaxies’ images to identify the likely causes for such deviations. We find that the residual flux fraction (RFF), which measures the fractional contribution to the galaxy light of the residuals left after subtracting a symmetric and smooth model, is very sensitive to the degree of structural disturbance but not the causes of such disturbance. On the other hand, the asymmetry of these residuals (Ares) is more sensitive to the causes of the disturbance, with merging galaxies having the highest values of Ares. Using these quantitative parameters, we find that, at a fixed morphology, cluster and field galaxies show statistically similar degrees of disturbance. However, there is a higher fraction of symmetric and passive spirals in the cluster than in the field. These galaxies have smoother light distributions than their star-forming counterparts. We also find that while almost all field and cluster S0s appear undisturbed, there is a relatively small population of star-forming S0s in clusters but not in the field. These findings are consistent with relatively gentle environmental processes acting on galaxies infalling on to clusters.
Kshitija Kelkar, Meghan E. Gray, Alfonso Aragón-Salamanca, Gregory Rudnick, Bo Milvang-Jensen, Pascale Jablonka, Tim Schrabback; The effect of the environment on the structure, morphology and star formation history of intermediate-redshift galaxies, Monthly Notices of the Royal Astronomical Society, Volume 469, Issue 4, 21 August 2017, Pages 4551–4564, https://doi.org/10.1093/mnras/stx1155
Items in KU ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.
We want to hear from you! Please share your stories about how Open Access to this item benefits YOU.
Showing items related by title, author, creator and subject.
ALMA Observations of Gas-rich Galaxies in z ~ 1.6 Galaxy Clusters: Evidence for Higher Gas Fractions in High-density Environments Noble, Allison; McDonald, Michael; Muzzin, Adam; Nantais, J.; Rudnick, Gregory H.; van Kampen, Eelco; Webb, T. M. A.; Wilson, G.; Yee, H. K. C.; Boone, Kyle; Cooper, Michael C.; DeGroot, A.; Delahaye, A.; Demarco, Ricardo; Foltz, R.; Hayden, Brian; Lidman, Chris; Manilla-Robles, A.; Perlmutter, S. (American Astronomical Society, 2017-06-20)We present ALMA CO (2–1) detections in 11 gas-rich cluster galaxies at z ~ 1.6, constituting the largest sample of molecular gas measurements in z > 1.5 clusters to date. The observations span three galaxy clusters, derived ...
Unveiling the Nature of Submillimeter Galaxy SXDF 850.6 Hatsukade, B.; Iono, D.; Akiyama, Toru; Yoshikawa, M.; Dunlop, J. S.; Ivison, R. J.; Peck, A. B.; Ikarashi, S.; Biggs, A. D.; Ezawa, H.; Hanami, H.; Ho, P.; Hughes, D. H.; Kawabe, R.; Kohno, K.; Matsushita, S.; Nakanishi, K.; Padilla, N.; Petitpas, G.; Tamura, Y.; Wagg, J.; Wilner, D. J.; Wilson, Graham Wallace; Yamada, T.; Yun, M. S. (American Astronomical Society, 2010-03-10)We present an 880 μm Submillimeter Array (SMA) detection of the submillimeter galaxy SXDF 850.6. SXDF 850.6 is a bright source (S 850 μm = 8 mJy) detected in the SCUBA Half Degree Extragalactic Survey and has multiple ...
AzTEC half square degree survey of the SHADES fields — II. Identifications, redshifts and evidence for large-scale structure Michałowski, Michał J.; Dunlop, J. S.; Ivison, R. J.; Cirasuolo, M.; Caputi, K. I.; Aretxaga, I.; Arumugam, V.; Austermann, J. E.; Chapin, Edward L.; Chapman, S. C.; Coppin, K. E. K.; Egami, E.; Hughes, D. H.; Ibar, E.; Mortier, A. M. J.; Schael, A. M.; Scott, K. S.; Smail, Ian; Targett, T. A.; Wagg, J.; Wilson, Graham Wallace; Xu, L.; Yun, M. S. (Oxford University Press, 2013-01-07)The Astronomical Thermal Emission Camera (AzTEC) 1.1 mm survey of the two SCUBA HAlf Degree Extragalactic Survey (SHADES) fields is the largest (0.7 deg(2)) blank-field millimetre-wavelength (mm-wavelength) survey undertaken ...