Inferences on the Relations Between Central Black Hole Mass and Total Galaxy Stellar Mass in the High-Redshift Universe - Sorbonne Université Access content directly
Journal Articles The Astrophysical journal letters Year : 2016

Inferences on the Relations Between Central Black Hole Mass and Total Galaxy Stellar Mass in the High-Redshift Universe

Abstract

At the highest redshifts, $z\gt 6$, several tens of luminous quasars have been detected. The search for fainter active galactic nucleus (AGN), in deep X-ray surveys, has proven less successful, with few candidates to date. An extrapolation of the relationship between black hole (BH) and bulge mass would predict that the sample of $z\gt 6$ galaxies host relatively massive BHs ($\gt {10}^{6}\;{M}_{\odot }$), if one assumes that total stellar mass is a good proxy for bulge mass. At least a few of these BHs should be luminous enough to be detectable in the 4Ms CDFS. The relation between BH and stellar mass defined by local moderate-luminosity AGNs in low-mass galaxies, however, has a normalization that is lower by approximately an order of magnitude compared to the BH–bulge mass relation. We explore how this scaling changes the interpretation of AGNs in the high-z universe. Despite large uncertainties, driven by those in the stellar mass function, and in the extrapolation of local relations, one can explain the current non-detection of moderate-luminosity AGNs in Lyman Break Galaxies if galaxies below ${10}^{11}\;{M}_{\odot }$ are characterized by the low-normalization scaling, and, even more so, if their Eddington ratio is also typical of moderate-luminosity AGNs rather than luminous quasars. AGNs being missed by X-ray searches due to obscuration or instrinsic X-ray weakness also remain a possibility.

Dates and versions

hal-01304259 , version 1 (19-04-2016)

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Marta Volonteri, Amy E. Reines. Inferences on the Relations Between Central Black Hole Mass and Total Galaxy Stellar Mass in the High-Redshift Universe. The Astrophysical journal letters, 2016, 820 (1), pp.L6. ⟨10.3847/2041-8205/820/1/L6⟩. ⟨hal-01304259⟩
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