2001A&A...375L..18C


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET22:37:09

2001A&A...375L..18C - Astronomy and Astrophysics, volume 375, L18-21 (2001/8-3)

The stellar winds of Galactic Centre and the low accretion rate of Sgr A*.

COKER R.F.

Abstract (from CDS):

An attempt is made to reconcile the large wind-loss rates of stars in the Galactic Centre (GC) with the predicted low accretion rate for Sgr A*, the putative blackhole at the heart of the Milky Way. It is found that, independent of the details of the accretion, the bound but unaccreted gas has been accumulating in the potential well of Sgr A* for ≲103yrs and thus is not in equilibrium. Otherwise, the gas flows of the region would be visible in both the IR and X-ray. It appears that the blackhole was more active in the recent past due to the passing of a supernova blast shock but is presently in a short-lived dormant phase. The extended low frequency radio emission from the central parsec should visibily increase over the next few decades, as the shock passes completely in front of the absorbing gas and dust near Sgr A*. The GC may become more active in ≲105yrs due to either another supernova or sufficient accumulation of stellar winds in the central arcsecond.

Abstract Copyright:

Journal keyword(s): hydrodynamics - ISM: structure - stars: winds, outflows - galaxy: centre - accretion

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Sgr A-W HII 17 35 23.7 -29 01 09           ~ 4 0
2 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 338 0
3 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 296 0
4 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3342 3
5 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11246 0
6 GCIRS 16C WR* 17 45 40.12 -29 00 27.6           Ofpe/WN9 163 1
7 NAME Sgr A-E Rad 17 45 41.131 -29 04 36.43           ~ 72 0
8 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 620 0
9 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 435 0
10 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1879 1

    Equat.    Gal    SGal    Ecl

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2020.02.17-22:37:09

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