The properties of radio and mid-infrared detected galaxies and the effect of environment on the co-evolution of AGN and star formation at z ∼ 1
| Autor: | Lu Shen, Brian C. Lemaux, Roy R. Gal, Adam Tomczak, Gordon K. Squires, Debora Pelliccia, Po-Feng Wu, Denise Hung, Christopher D. Fassnacht, N. Miller, Lori M. Lubin, Dale D. Kocevski, John McKean |
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| Přispěvatelé: | Astronomy |
| Rok vydání: | 2020 |
| Předmět: |
Active galactic nucleus
Astrophysics::High Energy Astrophysical Phenomena galaxies: active FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences infrared: galaxies Luminosity 0103 physical sciences Cluster (physics) Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics radio continuum: galaxies Luminous infrared galaxy Physics 010308 nuclear & particles physics Star formation Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Redshift galaxies: clusters: general Space and Planetary Science galaxies: star formation Astrophysics of Galaxies (astro-ph.GA) Orbital motion galaxies: evolution |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, 494(4), 5374-5395. Oxford University Press |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staa1005 |
| Popis: | In this study we investigate 179 radio-IR galaxies drawn from a sample of spectroscopically-confirmed galaxies that are detected in radio and mid-infrared (MIR) in the redshift range of $0.55 \leq z \leq 1.30$ in the Observations of Redshift Evolution in Large Scale Environments (ORELSE) survey. We constrain the Active Galactic Nuclei (AGN) contribution in the total IR luminosity (f$_{\text{AGN}}$), and estimate the AGN luminosity (L$_{\text{AGN}}$) and the star formation rate (SFR) using the CIGALE Spectral Energy Distribution (SED) fitting routine. Based on the f$_{\text{AGN}}$ and radio luminosity, radio-IR galaxies are split into: galaxies that host either high or low f$_{\text{AGN}}$ AGN (high-/low-f$_{\text{AGN}}$), and star forming galaxies with little to no AGN activity (SFGs). We study the colour, stellar mass, radio luminosity, L$_{\text{AGN}}$ and SFR properties of the three radio-IR sub-samples, comparing to a spec-IR sample drawn from spectroscopically-confirmed galaxies that are also detected in MIR. No significant difference between radio luminosity of these sub-samples was found, which could be due to the combined contribution of radio emission from AGN and star formation. We find a positive relationship between L$_{\text{AGN}}$and specific SFR (sSFR) for both AGN sub-samples, strongly suggesting a co-evolution scenario of AGN and SF in these galaxies. A toy model is designed to demonstrate this co-evolution scenario, where we find that, in almost all cases, a rapid quenching timescale is required, which we argue is a signature of AGN quenching. The environmental preference for intermediate/infall regions of clusters/groups remains across the co-evolution scenario, which suggests that galaxies might be in an orbital motion around the cluster/group during the scenario. |
| Databáze: | OpenAIRE |
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