2013A&A...558A..32C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST13:52:15

2013A&A...558A..32C - Astronomy and Astrophysics, volume 558A, 32-32 (2013/10-1)

Echoes of multiple outbursts of Sagittarius A* revealed by Chandra.

CLAVEL M., TERRIER R., GOLDWURM A., MORRIS M.R., PONTI G., SOLDI S. and TRAP G.

Abstract (from CDS):

The relatively rapid spatial and temporal variability of the X-ray radiation from some molecular clouds near the Galactic center shows that this emission component is due to the reflection of X-rays generated by a source that was luminous in the past, most likely the central supermassive black hole, Sagittarius A*. Studying the evolution of the molecular cloud reflection features is therefore a key element in reconstructing Sgr A*'s past activity. The aim of the present work is to study this emission on small angular scales in order to characterize the source outburst on short time scales. We use Chandra high-resolution data collected from 1999 to 2011 to study the most rapid variations detected so far, those of clouds between 5' and 20' from Sgr A* toward positive longitudes. Our systematic spectral-imaging analysis of the reflection emission, notably of the Fe Kα line at 6.4keV and its associated 4-8keV continuum, allows us to characterize the variations down to a 15'' angular scale and a 1-year time scale. We reveal for the first time abrupt variations of only a few years and, in particular, a short peaked emission, with a factor of 10 increase followed by a comparable decrease, which propagates along the dense filaments of one cloud. This 2-year peaked feature contrasts with the slower 10-year linear variations we reveal in all the other molecular structures of the region. Based on column density constraints, we argue that these two different behaviors are unlikely to be due to the same illuminating event. The variations likely stem from a highly variable active phase of Sgr A* which occurred sometime within the past few hundred years, and is characterized by at least two luminous outbursts with typical time scales of a few years and during which the Sgr A* luminosity went up to at least 1039erg/s.

Abstract Copyright:

Journal keyword(s): Galaxy: center - X-rays: ISM - ISM: clouds

CDS comments: Br1 and Br2 are bridge 1 and bridge 2 from 2010ApJ...714..732P, not in SIMBAD.

Simbad objects: 17

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Number of rows : 17

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 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1699 1
2 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1764 0
3 NAME Sgr C MoC 17 44 36.3 -29 28 13           ~ 308 0
4 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 916 0
5 NAME Fermi Bubbles bub 17 45 -29.0           ~ 270 0
6 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3446 3
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
8 PSR J1745-2900 Psr 17 45 40.1640 -29 00 29.818           ~ 218 0
9 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 629 0
10 [CWP2012b] A X 17 45 52.398 -28 56 38.15           ~ 11 0
11 [CWP2012b] B1 X 17 45 59.592 -28 57 10.09           ~ 11 0
12 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 597 0
13 GAL 000.11-00.11 MoC 17 46 18 -28 54.0           ~ 56 0
14 NAME Sgr B MoC 17 47 02 -28 25.4           ~ 189 0
15 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1909 1
16 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1097 2
17 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2281 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-13:52:15

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