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Title:
Black hole growth and stellar assembly at high-z
Authors:
Polletta, M.
Affiliation:
AA(Institut d'Astrophysique de Paris (IAP), 98bis boulevard Arago, 75014 Paris, France ; INAF - IASF Milano, via E. Bassini 15, 20133 Milan, Italy)
Publication:
Astronomy and Astrophysics, Volume 480, Issue 3, 2008, pp.L41-L45 (A&A Homepage)
Publication Date:
03/2008
Origin:
EDP Sciences
Keywords:
galaxies: active, galaxies: evolution, galaxies: high-redshift, quasars: general, infrared: galaxies
DOI:
10.1051/0004-6361:20079200
Bibliographic Code:
2008A&A...480L..41P

Abstract

Context: Observations indicate a strong link between star formation and black hole (BH) growth, but some questions remain unanswered: whether both activities are coeval or whether one precedes the other, what their characteristic timescales are, and what kinds of physical processes are responsible for this interplay.
Aims: We examine stellar and BH masses (M* and M_BH) in z ˜2 active systems at the peak of their AGN or star formation activity to investigate how they are linked and whether AGN radiative or else radio power provides a feedback mechanism that regulates the stellar growth in these systems.
Methods: We analyze the infrared (IR) spectral energy distributions of radio, sub-millimeter and mid-IR selected AGNs at z˜1-3 and constrain their stellar and AGN luminosities using AGN and host-galaxy templates.
Results: We find evidence of increasing stellar light, thereby decreasing the AGN mid-IR power going from mid-IR selected AGNs, to radio galaxies, and to sub-millimeter AGNs. This trend can be explained by either decreasing Eddington ratios or increasing offsets from the local M_BH-M* relation. All systems are characterized by high star formation rates regardless of their different AGN powers, thus neither AGN radiative power nor AGN-driven radio activity seems to influence the star formation rate in the selected AGNs. We discuss two possible evolutionary scenarios that might link these three AGN classes.
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