2009A&A...496L...9M


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET01:55:26

2009A&A...496L...9M - Astronomy and Astrophysics, volume 496, L9-12 (2009/3-3)

Broad HI absorption in the candidate binary black hole 4C37.11 (B2 0402+379).

MORGANTI R., EMONTS B. and OOSTERLOO T.

Abstract (from CDS):

We report the discovery of extremely broad 21-cm HI absorption (FWZI∼1600km/s) detected with the Westerbork Synthesis Radio Telescope in the radio source 4C37.11 (B2 0402+379). This object has been claimed to host a supermassive binary black hole (Rodriguez et al. 2006). The main features in the absorption profile are two components, separated by ∼1100km/s. The HI absorption in 4C37.11 is unusual because it is the first case where broad absorption is found to be centred on the systemic velocity of the host galaxy and not asymmetric and blueshifted as seen in all other galaxies with broad HI absorption. Given the large width of the absorption, we suggest that a possible explanation for the extreme properties of the HI absorption is that it is the kinematical signature of a binary black hole. If this interpretation is correct, the combined black-hole mass derived from the absorption profile is consistent with that derived from the luminosity of the spheroid. If the broad absorption is indeed due to a binary black hole, this finding confirms the importance of the gaseous component in the merging process of supermassive black holes.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: 4C37.11 (B2 0402+379) - galaxies: ISM

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 75 PaG 02 57 41.64 +06 01 28.0           ~ 285 1
2 ICRF J040549.2+380332 SyG 04 05 49.2627587 +38 03 32.234373   18.5 18.5     ~ 123 3
3 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1497 2
4 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2136 2

    Equat.    Gal    SGal    Ecl

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2020.11.28-01:55:26

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