2001A&A...380..251G


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.08CEST10:47:40

2001A&A...380..251G - Astronomy and Astrophysics, volume 380, 251-257 (2001/12-2)

ROSAT/Chandra observations of a bright transient in M 81.

GHOSH K.K., SWARTZ D.A., TENNANT A.F. and WU K.

Abstract (from CDS):

We present a 10-year X-ray light curve and the spectra of a peculiar X-ray transient in the spiral galaxy M 81. The source was below the detection limit of ROSAT PSPC before 1993, but it brightened substantially in 1993, with luminosities exceeding the Eddington limit of a 1.5-M compact accretor. It then faded and was not firmly detected in the ROSAT HRI and PSPC observations after 1994. The Chandra image obtained in 2000 May, however, shows an X-ray source at its position within the instrumental uncertainties. The Chandra source is coincident with a star-like object in the Digitized-Sky-Survey. A Hubble image suggests that the optical object may be extended. While these three observations could be of the same object, which may be an X-ray binary containing a black-hole candidate, the possibility that the ROSAT and Chandra sources are two different objects in a dense stellar environment cannot be ruled out. The Hubble data suggests that the optical object may be a globular cluster yet to be identified.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - X-rays: galaxies - black hole physics - stars: binaries: close - clusters: general globular

CDS comments: Source P33 = [IW2001] P33.

Simbad objects: 18

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Number of rows : 18

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 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11302 1
2 1A 0620-00 HXB 06 22 44.5420315454 -00 20 44.289428950 10.60 11.40 11.2     K3V-K7V 1052 0
3 [RW2000] NGC 3031 X-2 X 09 55 01.0 +69 07 41           ~ 2 0
4 [CFT2001] 40 GlC 09 55 02.1636611373 +69 05 37.752240759   19.06 18.16   17.08 ~ 10 0
5 [RW2000] NGC 3031 X-3 X 09 55 03.0 +68 56 15           ~ 2 0
6 [PR95] 50548 GlC 09 55 09.86 +69 04 08.0   18.29 17.53   16.42 ~ 5 0
7 [LB2005] NGC 3031 X13 X 09 55 12.84 +69 08 27.7           ~ 3 0
8 [PR95] 50658 ? 09 55 16.061 +69 05 15.86   16.8 15.91     ~ 2 0
9 [IW2001] H16 X 09 55 21.884 +69 06 37.67     17.14     ~ 4 0
10 [PR95] 50777 GlC 09 55 21.97 +69 06 38.0   17.79 16.92   15.77 ~ 10 0
11 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1287 1
12 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4059 5
13 V* GU Mus HXB 11 26 26.5947467816 -68 40 32.888148788           K3V-K7V 677 1
14 [BWC2008] U35 ULX 13 25 19.87 -43 03 17.1           ~ 18 1
15 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4094 3
16 V* BR Cir HXB 15 20 40.85 -57 10 00.1   21.4 21.4     ~ 735 1
17 V* QZ Vul HXB 20 02 49.58 +25 14 11.3   19.64 18.2     K3V-K6V 400 0
18 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1126 0

    Equat.    Gal    SGal    Ecl

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2021.05.08-10:47:40

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