2010A&A...524A..69D


Query : 2010A&A...524A..69D

2010A&A...524A..69D - Astronomy and Astrophysics, volume 524, A69-69 (2010/12-1)

A four-year baseline Swift study of enigmatic X-ray transients located near the Galactic Center.

DEGENAAR N. and WIJNANDS R.

Abstract (from CDS):

We report on continued monitoring observations of the Galactic center carried out by the X-ray telescope aboard the Swift satellite in 2008 and 2009. This campaign revealed activity of the five known X-ray transients AX J1745.6-2901, CXOGC J174535.5-290124, GRS 1741-2853, XMM J174457-2850.3 and CXOGC J174538.0-290022. All these sources are known to undergo very faint X-ray outbursts with 2-10keV peak luminosities of L_X, peak_∼1034–36erg/s, although the two confirmed neutron star low-mass X-ray binaries AX J1745.6-2901 and GRS 1741-2853 can also become brighter (L_X, peak_∼1036–37erg/s). We discuss the observed long-term lightcurves and X-ray spectra of these five enigmatic transients. In 2008, AX J1745.6-2901 returned to quiescence following an unusually long accretion outburst of more than 1.5 years. GRS 1741-2853 was active in 2009 and displayed the brightest outburst ever recorded for this source, reaching up to a 2-10keV luminosity of LX∼1x1037 (D/7.2kpc)2erg/s. This system appears to undergo recurrent accretion outbursts approximately every 2 years. Furthermore, we find that the unclassified transient XMM J174457-2850.3 becomes bright only during short episodes (days) and is often found active in between quiescence (LX∼1032erg/s) and its maximum outburst luminosity of LX∼1036erg/s. CXOGC J174535.5-290124 and CXOGC J174538.0-290022, as well as three other very-faint X-ray transients that were detected by Swift monitoring observations in 2006, have very low time-averaged mass-accretion rates of <{dot}(M)>long≲2x10–12M/yr. Despite having obtained two years of new data in 2008 and 2009, no new X-ray transients were detected.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - stars: neutron - accretion, accretion disks - Galaxy: center - X-rays: general

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 CXOGC J174457.4-285021 X 17 44 57.34 -28 50 20.3           ~ 36 0
2 2XMM J174502.1-285450 LXB 17 45 02.33 -28 54 49.7           ~ 127 0
3 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 933 0
4 CXOU J174535.5-290124 X 17 45 35.58 -29 01 24.1           ~ 19 0
5 [SKM2002] 27 LXB 17 45 35.65 -29 01 34.0           ~ 173 1
6 CXOGC J174538.0-290022 X 17 45 38.07 -29 00 22.3           ~ 21 0
7 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13083 0
8 CXOGC J174540.0-290005 X 17 45 40.0 -29 00 05           ~ 22 1
9 CXOGC J174540.0-290031 LXB 17 45 40.03 -29 00 31.0           ~ 37 0
10 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3928 3
11 SSTGLMC G359.7741-00.1691 X 17 45 44.54 -29 13 01.5           ~ 7 0
12 SWIFT J174553.7-290347 X 17 45 53.79 -29 03 47.8           ~ 5 1
13 CXOGC J174553.8-290346 X 17 45 53.85 -29 03 46.8           ~ 4 1
14 CXOGC J174554.3-285454 smm 17 45 54.46 -28 54 55.0           ~ 17 1
15 SWIFT J174622.1-290634 X 17 46 22.14 -29 06 34.7           ~ 4 0

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2022.08.09-03:04:34

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