The Fastest Galaxy Evolution in an Unbiased Compact Group Sample with WISE
arXiv:1701.01102 · doi:10.3847/1538-4357/835/2/280
Abstract
We study the mid-infrared (MIR) properties of galaxies in compact groups and their environmental dependence using the \textit{Wide-field Infrared Survey Explorer (WISE)} data. We use a volume-limited sample of 670 compact groups and their 2175 member galaxies with and , drawn from \citet{sohn+16}, which were identified using a friends-of-friends algorithm. Among the 2175 galaxies, 1541 galaxies are detected at \textit{WISE} 12 $\micron$ with a signal-to-noise ratio greater than 3. Among the 1541 galaxies, 433 AGN-host galaxies are identified by using both optical and MIR classification scheme. Using the remaining 1108 non-AGN galaxies, we find that the MIR colors of compact group early-type galaxies are on average bluer than those of cluster early-type galaxies. When compact groups have both early- and late-type member galaxies, the MIR colors of the late-type members in those compact groups are bluer than the MIR colors of cluster late-type galaxies. As compact groups are located in denser regions, they tend to have larger early-type galaxy fractions and bluer MIR color galaxies. These trends are also seen for neighboring galaxies around compact groups. However, compact group member galaxies always have larger early-type galaxy fractions and bluer MIR colors than their neighboring galaxies. Our findings suggest that the properties of compact group galaxies depend on both internal and external environments of compact groups, and that galaxy evolution is faster in compact groups than in the central regions of clusters.
17 pages, 14 figures, 3 tables, accepted for publication in ApJ
References in corpus (19)
- The Host Galaxies and Classification of Active Galactic Nuclei
- K-corrections and filter transformations in the ultraviolet, optical, and near infrared
- Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation
- Powerful High Velocity-Dispersion Molecular Hydrogen Associated with an Intergalactic Shock Wave in Stephan's Quintet
- Compact groups in theory and practice - III. Compact groups of galaxies in the Sixth Data Release of the Sloan Digital Sky Survey
- The Infrared Properties of Hickson Compact Groups
- Transformation of Morphology and Luminosity Classes of the SDSS Galaxies
- Catching Quenching Galaxies: The Nature of the WISE Infrared Transition Zone
- Evidence for tidal interaction and merger as the origin of galaxy morphology evolution in compact groups
- Truncated Star Formation in Compact Groups of Galaxies: A Stellar Population Study
- Where are compact groups in the local Universe?
- Galaxy Interactions in Compact Groups II: abundance and kinematic anomalies in HCG 91c
- Galaxy evolution in the mid-infrared green valley: a case of the A2199 supercluster
- Uncovering the Near-IR Dwarf Galaxy Population of the Coma Cluster with Spitzer IRAC
- Intragroup and Galaxy-Linked Diffuse X-ray Emission in Hickson Compact Groups
- A View of Point Sources in Hickson Compact Groups: High AGN fraction but a dearth of strong AGNs
- Studying the evolution of galaxies in compact groups over the past 3 Gyr. I. The nuclear activity
- Some Like It Hot: Linking Diffuse X-ray Luminosity, Baryonic Mass, and Star Formation Rate in Compact Groups of Galaxies
- Comparing galaxy populations in compact and loose groups of galaxies III. Effects of environment on star formation