A Long, Hard Look at the Low-Hard State in Accreting Black Holes
| dc.creator | Miller, J. M. | |
| dc.creator | Homan, J. | |
| dc.creator | Steeghs, D. | |
| dc.creator | Rupen, M. | |
| dc.creator | Hunstead, R. W. | |
| dc.creator | Wijnands, R. | |
| dc.creator | Charles, P. A. | |
| dc.creator | Fabian, A. C. | |
| dc.date | 2006-02-28 | |
| dc.date | 2006-08-25 | |
| dc.date.accessioned | 2026-07-07T10:43:39Z | |
| dc.date.available | 2026-07-07T10:43:39Z | |
| dc.description | We present the first results of coordinated multi-wavelength observations of the Galactic black hole GX 339-4 in a canonical low-hard state, obtained during its 2004 outburst. XMM-Newton observed the source for 2 revolutions, or approximately 280 ksec; RXTE monitored the source throughout this long stare. The resulting data offer the best view yet obtained of the inner accretion flow geometry in the low-hard state, which is thought to be analogous to the geometry in low-luminosity active galactic nuclei. The XMM-Newton spectra clearly reveal the presence of a cool accretion disk component, and a relativistic Fe K emission line. The results of fits made to both components strongly suggest that a standard thin disk remains at or near to the innermost stable circular orbit, at least in bright phases of the low-hard state. These findings indicate that potential links between the inner disk radius and the onset of a steady compact jet, and the paradigm of a radially-recessed disk in the low-hard state, do not hold universally. The results of our observations can best be explained if a standard thin accretion disk fuels a corona which is closely related to, or consistent with, the base of a compact jet. In a brief examination of archival data, we show that Cygnus X-1 supports this picture of the low/hard state. We discuss our results within the context of disk-jet connections and prevailing models for accretion onto black holes. | |
| dc.description | 13 pages, 10 figures (6 in color), ApJ, in press | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0602633 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0602633 | |
| dc.identifier | Astrophys.J.653:525-535,2006 | |
| dc.identifier | doi:10.1086/508644 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/182315 | |
| dc.subject | Astrophysics | |
| dc.title | A Long, Hard Look at the Low-Hard State in Accreting Black Holes | |
| dc.type | text |