Spectroscopy of Luminous Compact Blue Galaxies in Distant Clusters II. Physical Properties of dE Progenitor Candidates

Abstract

Luminous Compact Blue Galaxies (LCBGs) are an extreme star-bursting population of galaxies that were far more common at earlier epochs than today. Based on spectroscopic and photometric measurements of LCBGs in massive (M >10^15 M_sun), intermediate redshift (0.5 < z < 0.9) galaxy clusters, we present their rest-frame properties including star-formation rate, dynamical mass, size, luminosity, and metallicity. The appearance of these small, compact galaxies in clusters at intermediate redshift helps explain the observed redshift evolution in the size-luminosity relationship among cluster galaxies. In addition, we find the rest-frame properties of LCBGs appearing in galaxy clusters are indistinguishable from field LCBGs at the same redshift. Up to 35% of the LCBGs show significant discrepancies between optical and infrared indicators of star formation, suggesting that star formation occurs in obscured regions. Nonetheless, the star formation for LCBGs shows a decrease toward the center of the galaxy clusters. Based on their position and velocity, we estimate that up to 10% of cluster LCBGs are likely to merge with another cluster galaxy. Finally, the observed properties and distributions of the LCBGs in these clusters lead us to conclude that we are witnessing the quenching of the progenitors of dwarf elliptical galaxies that dominate the number density of present-epoch galaxy clusters.

37 pages, 8 figures. Accepted for publication in ApJ

References in corpus (15)

• Astropy: A Community Python Package for Astronomy
• Strangulation in Galaxy Groups
• High velocity outflows from young star-forming galaxies in the UKIDSS Ultra-Deep Survey
• The relation between stellar populations, structure and environment for dwarf elliptical galaxies from the MAGPOP-ITP
• On the Origin of Dwarf Elliptical Galaxies: The Fundamental Plane
• Enhanced mergers of galaxies in low-redshift clusters
• The Red Sequence Luminosity Function in Massive Intermediate Redshift Galaxy Clusters
• Luminous Compact Blue Galaxies up to z~1 in the HST Ultra Deep Field: I. Small galaxies, or blue centers of massive disks?
• Dwarf galaxies in the Perseus Cluster: further evidence for a disc origin for dwarf ellipticals
• The sizes of disc galaxies in intermediate-redshift clusters
• Planetary nebulae: the universal mass-metallicity relation for Local Group dwarf galaxies and the chemistry of NGC 205
• Unravelling the morphologies of Luminous Compact Galaxies using the HST/ACS GOODS survey
• Spatial and Kinematic Distributions of Transition Populations in Intermediate Redshift Galaxy Clusters
• Stellar Populations Found in the Central kpc of Four Luminous Compact Blue Galaxies at Intermediate Redshift
• The Far-Infrared-Radio Correlation in MS0451-03

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• Cluster Mass Calibration at High Redshift: HST Weak Lensing Analysis of 13 Distant Galaxy Clusters from the South Pole Telescope Sunyaev-Zel'dovich Survey
• The evolution of galaxy scaling relations in clusters at 0.5<z<1.5
• Star-forming Galaxies in Intermediate Redshift Clusters: Stellar vs. Dynamical Masses of Luminous Compact Blue Galaxies
• The Evolution of the Luminosity Function for Luminous Compact Blue Galaxies to z=1