A Good Long Look at the Black Hole Candidates LMC X-1 and LMC X-3

Details A Good Long Look at the Black Hole Candidates LMC X-1 and LMC X-3 A Good Long Look at the Black Hole Candidates LMC X-1 and LMC X-3

2000-05-24

arxiv.org/abs/astro-ph/0005487v2

Mon.Not.Roy.Astron.Soc. 320 (2001) 316

Astronomy and Astrophysics

Astrophysics

MNRAS, in press, clearified discussion, esp. on Fe line

Scientific paper

10.1046/j.1365-8711.2001.03984.x

We present results from 170ksec long RXTE observations of LMC X-1 and LMC X-3, taken in 1996 December, where their spectra can be described by a disc black body plus an additional soft (Gamma~2.8) high-energy power-law (detected up to 50keV in LMC X-3). These observations, as well as archival ASCA observations, constrain any narrow Fe line present in the spectra to have an equivalent width <90eV, broad lines (~150eV EW, \sigma ~ 1keV) are permitted. We also study the variability of LMC X-1. Its X-ray power spectral density (PSD) is approximately f^{-1} between 10^{-3} and 0.3Hz with a rms variability of ~7%. Above 5keV the PSD shows evidence of a break at f > 0.2Hz, possibly indicating an outer disc radius of ~1000GM/c^2 in this likely wind-fed system. Furthermore, the coherence function between variability in the > 5keV band and variablity in the lower energy bands is extremely low. We discuss the implications of these observations for the mechanisms.

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