2017A&A...607L...7M


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.23CET18:28:56

2017A&A...607L...7M - Astronomy and Astrophysics, volume 607, L7-7 (2017/11-1)

Exhaustion of the gas next to the supermassive black hole of M31.

MELCHIOR A.-L. and COMBES F.

Abstract (from CDS):

New observations performed at the IRAM Plateau de Bure reveal the absence of molecular gas next to the black hole of the Andromeda galaxy. We derived a 3σ upper limit on the molecular gas mass of 4300M for a line width of 1000km/s. This is compatible with infra-red observations, which reveal a hole in the dust emission next to the black hole. Some gas from stellar feedback is expected from the old eccentric stellar disc population, but it is not accreted close to the black hole. This absence of gas explains the absence of stellar formation observed in this region, contrary to what is observed next to Sgr A* in the Milky Way. Either the gas has been swallowed by the black hole, or a feedback mechanism has pushed the gas outside the central 1 pc. Nevertheless, we detect a small clump of gas with a very low velocity dispersion at 2.4'' from the black hole. It is probable that this clumpy gas is seen in projection, as it does not follow the rotation of the disc surrounding the black hole, its velocity dispersion is ten times lower than the expected velocity gradient, and the tidal shear from the black hole requires a gas density for this clump that is not compatible with our observations.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: individual: M31 - galaxies: kinematics and dynamics - ISM: molecules - submillimeter: ISM - submillimeter: ISM

Simbad objects: 6

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Number of rows : 6

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 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2025 2
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11088 1
3 [LFG93] P3 PoG 00 42 44.34 +41 16 08.5           ~ 16 1
4 NAME P2B Cluster PoG 00 42 44.34 +41 16 08.5           ~ 38 0
5 [LFG93] P1 PoG 00 42 44.37 +41 16 08.9           ~ 37 0
6 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3534 3

    Equat.    Gal    SGal    Ecl

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2020.11.23-18:28:56

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