SIMBAD references

2001ApJ...553L..47G - Astrophys. J., 553, L47-L50 (2001/May-3)

New evidence for black hole event horizons from Chandra.

GARCIA M.R., McCLINTOCK J.E., NARAYAN R., CALLANAN P., BARRET D. and MURRAY S.S.

Abstract (from CDS):

Previously we claimed that black hole X-ray novae (BHXNs) in quiescence are much less luminous than equivalent neutron star X-ray novae (NSXNs). This claim was based on the quiescent detection of a single short-period BHXN (A0620-00, Porb=7.8 hr) and two longer period BHXNs (GRO J1655-40, Porb=62.9 hr; V404 Cygni, Porb=155.3 hr), along with sensitive upper limits. Here we announce the detection of two more short-period BHXNs (GRO J0422+32, Porb=5.1 hr; GS 2000+25, Porb=8.3 hr), an upper limit for a third that is improved by 2 orders of magnitude (4U 1543-47, Porb=27.0 hr), and a new, much lower quiescent measurement of GRO J1655-40. Taken together, these new Chandra Advanced CCD Imaging Spectrometer measurements confirm that the quiescent X-ray luminosities of BHXNs are significantly lower than those of NSXNs. We argue that this provides strong evidence for the existence of event horizons in BHXNs.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Close - Black Hole Physics - Stars: Individual: Alphanumeric: A0620-00 - Stars: Individual: Alphanumeric: GRO J0422+32 - Stars: Individual: Alphanumeric: GRO J1655-40 - Stars: Individual: Alphanumeric: GS 2000+25 - Stars: Individual: Constellation Name: V404 Cygni - Stars: Individual: Alphanumeric: 4U 1543-47 - Stars: Neutron - X-Rays: Stars

Simbad objects: 14

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