2003ApJ...590L..13K

Query : 2003ApJ...590L..13K

2003ApJ...590L..13K - Astrophys. J., 590, L13-L16 (2003/June-2)

A luminous recurrent supersoft X-ray source in NGC 300.

KONG A.K.H. and DI STEFANO R.

Abstract (from CDS):

We report the results of XMM-Newton observations for an especially luminous supersoft X-ray source (SSS) with a bolometric luminosity of 1039 ergs.s–1 in the spiral galaxy NGC 300. The source was detected as an SSS in 1992 and disappeared in subsequent X-ray observations. The source was active again during recent XMM-Newton observations. It appeared to be very soft (kT∼60 eV) and very luminous (∼1038-1039 ergs.s–1). The two XMM-Newton observations also reveal that the source went from a ``high'' state to a ``low'' state in 6 days. We also found a 5.4 hr periodicity during the low state. We consider white dwarf, black hole, and neutron star models in order to explain the nature of the source.

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Journal keyword(s): Galaxies: Individual: NGC Number: NGC 300 - X-Rays: Binaries - X-Rays: Galaxies

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 - 2026 		#notes
1 2E 0035.4-7229 XB* 00 37 19.6683991960 -72 14 13.187852739   20.0 20.2     ~ 104 0
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 Bol 375 GlC 00 45 45.5769690648 +41 39 42.248420640 18.80 18.317 17.471 16.958 16.386 ~ 61 0
4 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
5 [BL97] N300-S21 SR? 00 55 07.22 -37 39 14.7           ~ 2 0
6 [PGF2001] AS 99 As* 00 55 08.8 -37 39 33           ~ 2 0
7 [BL97] N300-H20 HII 00 55 08.85 -37 39 27.4           ~ 7 0
8 [BL97] N300-S23 SR? 00 55 09.17 -37 39 32.2           ~ 2 0
9 [WMR2006] NGC300 XMM4 X 00 55 10.7 -37 38 55           ~ 13 1
10 [PFP2004] J005512.3-373908 HII 00 55 12.2 -37 39 07           ~ 4 0
11 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
12 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 895 0
13 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
14 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
15 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2

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