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The X-ray Outburst of H1743-322: High-Frequency QPOs with a 3:2 Frequency Ratio | | Ronald A. Remillard
; Jeffrey E. McClintock
; Jerome A. Orosz
; Alan M. Levine
; | | Date: |
1 Jul 2004 | | Subject: | astro-ph | | Affiliation: | MIT), Jeffrey E. McClintock (CFA), Jerome A. Orosz (SDSU), and Alan M. Levine (MIT | | Abstract: | We observed the 2003 X-ray outburst of H1743-322 in a series of 130 pointed observation with RXTE. We searched individual observations for high-frequency QPOs (HFQPOs) and found only weak or marginal detections near 240 and 160 Hz. We next grouped the observations in several different ways and computed the average power-density spectra (PDS) in a search for further evidence of HFQPOs. This effort yielded two significant results for those observations defined by the presence of low-frequency QPOs (0.1-20 Hz) and an absence of ``band-limited’’ power continua: (1) The 9 time intervals with the highest 7-35 keV count rates yielded an average PDS with a QPO at $166 pm 5$ Hz. ($4.1 sigma$; 3--35 keV); and (2) a second group with lower 7-35 keV count rates (26 intervals) produced an average PDS with a QPO at $242 pm 3$ Hz ($6.0 sigma$; 7--35 keV). The ratio of these two frequencies is $1.46 pm 0.05$. This finding is consistent with results obtained for three other black hole systems that exhibit commensurate HFQPOs in a 3:2 ratio. Furthermore, the occurrence of H1743-322’s slower HFQPO at times of higher X-ray luminosity closely resembles the behavior of XTE J1550-564 and GRO J1655-40. We discuss our results in terms of a resonance model that invokes frequencies set by general relativity for orbital motions near a black-hole event horizon. | | Source: | arXiv, astro-ph/0407025 | | Services: | Forum | Review | PDF | Favorites | |
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