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Publication . Preprint . Article . 2018

The Spitzer-IRAC/MIPS Extragalactic Survey (SIMES). II. Enhanced Nuclear Accretion Rate in Galaxy Groups at z~0.2

Ivano Baronchelli; G. Rodighiero; Harry I. Teplitz; Claudia Scarlata; Alberto Franceschini; S. Berta; Laia Barrufet; +18 Authors
Open Access

For a sample of star forming galaxies in the redshift interval 0.15$<$z$<$0.3, we study how both the relative strength of the AGN infra-red emission, compared to that due to the star formation (SF), and the numerical fraction of AGNs, change as a function of the total stellar mass of the hosting galaxy group (M$^{*}_{\mathrm{group}}$), between $10^{10.25}$ and $10^{11.9}$M$_{\odot}$. Using a multi-component SED fitting analysis, we separate the contribution of stars, AGN torus and star formation to the total emission at different wavelengths. This technique is applied to a new multi-wavelength data-set in the SIMES field (23 not redundant photometric bands), spanning the wavelength range from the UV (GALEX) to the far-IR (Herschel) and including crucial AKARI and WISE mid-IR observations (4.5 \mu m$<\lambda<$24 \mu m), where the BH thermal emission is stronger. This new photometric catalog, that includes our best photo-z estimates, is released through the NASA/IPAC Infrared Science Archive (IRSA). Groups are identified through a friends of friends algorithm ($\sim$62% purity, $\sim$51% completeness). We identified a total of 45 galaxies requiring an AGN emission component, 35 of which in groups and 10 in the field. We find BHAR$\propto ($M$^{*}_{\mathrm{group}})^{1.21\pm0.27}$ and (BHAR/SFR)$\propto ($M$^{*}_{\mathrm{group}})^{1.04\pm0.24}$ while, in the same range of M$^{*}_{\mathrm{group}}$, we do not observe any sensible change in the numerical fraction of AGNs. Our results indicate that the nuclear activity (i.e. the BHAR and the BHAR/SFR ratio) is enhanced when galaxies are located in more massive and richer groups.

Comment: 31 pages, 23 figures

Subjects by Vocabulary

arXiv: Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics::Galaxy Astrophysics Astrophysics::Earth and Planetary Astrophysics Astrophysics::Solar and Stellar Astrophysics Astrophysics::High Energy Astrophysical Phenomena High Energy Physics::Experiment

Microsoft Academic Graph classification: Physics Stellar mass Galaxy group Galaxy Star formation Luminous infrared galaxy Astrophysics Redshift Spectral energy distribution Active galactic nucleus


Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics, submillimeter: galaxies, quasars: supermassive black holes, infrared: galaxies, galaxies: evolution, galaxies: groups: general, galaxies: star formation, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Space and Planetary Science, Astronomy and Astrophysics, Astrophysics of Galaxies (astro-ph.GA), Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph]

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Funded by
Herschel Extragalactic Legacy Project
  • Funder: European Commission (EC)
  • Project Code: 607254
  • Funding stream: FP7 | SP1 | SPA