2001A&A...372..241C


Query : 2001A&A...372..241C

2001A&A...372..241C - Astronomy and Astrophysics, volume 372, 241-244 (2001/6-2)

A BeppoSAX view of transient black hole candidates in quiescence.

CAMPANA S., PARMAR A.N. and STELLA L.

Abstract (from CDS):

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 1-10keV upper limits for GRO J0422+32, GRS 1009-45, 4U 1630-47 and XTE J1748-288, which range from 2x1032erg/s to 5x1034erg/s. We positively detect GS 2023+338. Its X-ray spectrum can be fit by a power law (photon index Γ=1.9) or a thermal bremsstrahlung (with kTbr=7keV), converting in both cases to a 1-10keV unabsorbed luminosity of ∼1033erg/s. These values are comparable to the ones derived during an ASCA observation in 1994, indicating that the source remains stable over a ∼5 yr baseline.

Abstract Copyright:

Journal keyword(s): binaries: general - black hole physics - X-rays: stars

Simbad objects: 5

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Number of rows : 5
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 V* V518 Per HXB 04 21 42.7231318463 +32 54 26.936934166 13.00 13.50 13.2     M4.5V 628 1
2 V* MM Vel HXB 10 13 36.4107940553 -45 04 32.555813596   14.84 14.71     G5V-M0V 187 0
3 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 443 0
4 AX J1748.0-2829 LXB 17 48 05.060 -28 28 25.80     13.60     ~ 175 0
5 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1134 0

    Equat.    Gal    SGal    Ecl

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2021.07.25-18:19:47

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