A BeppoSAX view of transient black hole candidates in quiescence

被引:14
作者
Campana, S
Parmar, AN
Stella, L
机构
[1] Osservatorio Astron Brera, I-23807 Merate, Lecco, Italy
[2] European Space Agcy, ESTEC, Dept Space Sci, Div Astrophys, NL-2200 AG Noordwijk, Netherlands
[3] Osservatorio Astron Roma, I-00040 Rome, Italy
关键词
binaries : general; black hole physics; X-rays : stars;
D O I
10.1051/0004-6361:20010490
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report BeppoSAX observations of five transient black hole candidates during their quiescent phase. We confirm that these sources are X-ray faint, improving on and complementing existing upper limits. We derive 1-10 keV upper limits for GRO J0422+32, GRS 1009-45, 4U 1630-47 and XTE J1748-288, which range from 2 x 10(32) erg s(-1) to 5 x 10(34) erg s(-1). We positively detect GS 2023+338. Its X-ray spectrum can be fit by a power law (photon index Gamma = 1.9) or a thermal bremsstrahlung (with k T-br = 7 keV), converting in both cases to a 1-10 keV unabsorbed luminosity of similar to 10(33) erg s(-1). These values are comparable to the ones derived during an ASCA observation in 1994, indicating that the source remains stable over a similar to5 yr baseline.
引用
收藏
页码:241 / 244
页数:4
相关论文
共 29 条
[1]   ASCA observations of transient x-ray sources in quiescence [J].
Asai, K ;
Dotani, T ;
Hoshi, R ;
Tanaka, Y ;
Robinson, CR ;
Terada, K .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 1998, 50 (06) :611-619
[2]   ASCA observations of soft X-ray transients in quiescence: X1608-52 and Cen X-4 [J].
Asai, K ;
Dotani, T ;
Mitsuda, K ;
Hoshi, R ;
Vaughan, B ;
Tanaka, Y ;
Inoue, H .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 1996, 48 (02) :257-263
[3]   Coronal X-ray emission from the stellar companions to transiently accreting black holes [J].
Bildsten, L ;
Rutledge, RE .
ASTROPHYSICAL JOURNAL, 2000, 541 (02) :908-917
[4]   The medium-energy concentrator spectrometer on board the BeppoSAX X-ray astronomy satellite [J].
Boella, G ;
Chiappetti, L ;
Conti, G ;
Cusumano, G ;
DelSordo, S ;
LaRosa, G ;
Maccarone, MC ;
Mineo, T ;
Molendi, S ;
Re, S ;
Sacco, B ;
Tripiciano, M .
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1997, 122 (02) :327-340
[5]   BeppoSAX, the wide band mission for X-ray astronomy [J].
Boella, G ;
Butler, RC ;
Perola, GC ;
Piro, L ;
Scarsi, L ;
Bleeker, JAM .
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1997, 122 (02) :299-307
[6]   On the bolometric quiescent luminosity and luminosity swing of black hole candidate and neutron star low-mass X-ray transients [J].
Campana, S ;
Stella, L .
ASTROPHYSICAL JOURNAL, 2000, 541 (02) :849-859
[7]  
Campana S, 2000, ASTRON ASTROPHYS, V358, P583
[8]   Aquila X-1 from outburst to quiescence: The onset of the propeller effect and signs of a turned-on rotation-powered pulsar [J].
Campana, S ;
Stella, L ;
Mereghetti, S ;
Colpi, M ;
Tavani, M ;
Ricci, D ;
Dal Fiume, D ;
Belloni, T .
ASTROPHYSICAL JOURNAL, 1998, 499 (01) :L65-L68
[9]  
CAMPANA S, 1998, A A REV, V8, P269
[10]  
DellaValle M, 1997, ASTRON ASTROPHYS, V318, P179