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25 April 2024 |
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A Good Long Look at the Black Hole Candidates LMC X-1 and LMC X-3 | | M. A. Nowak
; J. Wilms
; W. A. Heindl
; K. Pottschmidt
; J. B. Dove
; M. C. Begelman
; | | Date: |
24 May 2000 | | Journal: | Mon.Not.Roy.Astron.Soc. 320 (2001) 316 | | Subject: | astro-ph | | Affiliation: | 4,5), M. C. Begelman(1,6) ( JILA, IAA Tuebingen, Astronomie, CASS, UCSD, CASA CU Boulder Metropolitan State College of Denver, APS, CU Boulder | | Abstract: | 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. | | Source: | arXiv, astro-ph/0005487 | | Services: | Forum | Review | PDF | Favorites | |
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