Actions
  • shareshare
  • link
  • cite
  • add
add
auto_awesome_motion View all 15 versions
Publication . Preprint . Article . 2018

The Spitzer-IRAC/MIPS Extragalactic Survey (SIMES): II enhanced nuclear accretion rate in galaxy groups at z$\sim$0.2

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

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::High Energy Astrophysical Phenomena Astrophysics::Earth and Planetary Astrophysics Astrophysics::Solar and Stellar Astrophysics High Energy Physics::Experiment

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

Subjects

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

131 references, page 1 of 14

Aird, J., Coil, A. L., & Georgakakis, A. 2017a, MNRAS, 465, 3390

-. 2017b, ArXiv e-prints, arXiv:1705.01132

Alexander, D. M., Smail, I., Bauer, F. E., et al. 2005, Nature, 434, 738

Alexander, D. M., Bauer, F. E., Brandt, W. N., et al. 2011, ApJ, 738, 44

Barnes, J. E., & Hernquist, L. 1992, ARA&A, 30, 705

Barnes, J. E., & Hernquist, L. E. 1991, ApJL, 370, L65

Baronchelli, I., Scarlata, C., Rodighiero, G., et al. 2016a, ApJS, 223, 1

-. 2016b, VizieR Online Data Catalog, 222

Berta, S., Lutz, D., Santini, P., et al. 2013, A&A, 551, A100

B´ethermin, M., Wang, L., Dor´e, O., et al. 2013, A&A, 557, A66

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