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Long-term Multi-wavelength Observations of GRS 1758-258 and the ADAF Model | | John W. Keck
; William W. Craig
; Charles J. Hailey
; Fiona Harrison
; Jae Sub Hong
; Steven M. Kahn
; Philip M. Lubin
; Ryan McLean
; Michael J. Pivovaroff
; Michael Seiffert
; Ron Wurtz
; Klaus P. Ziock
; | | Date: |
7 Aug 2001 | | Journal: | Astrophys.J. 563 (2001) 301 | | Subject: | astro-ph | | Affiliation: | Columbia Astrophysics Laboratory, Lawrence Livermore National Laboratory, Space Radiation Laboratory, UC Santa Barbara | | Abstract: | We present a long-term multi-wavelength light curve of Galactic black hole candidate GRS 1758-258 by combining previously published and archival data from GRANAT, ROSAT, CGRO, RXTE, SAX, ASCA, EXOSAT, and the VLA. In addition we include first spectral results from the balloon-borne Gamma-ray Arcminute Telescope Imaging System (GRATIS). In light of divergent analyses of the 1991-1993 ROSAT observations, we have re-analyzed these data; we find the soft X-rays track the hard X-rays, and that the fits require no black-body component-- indicating that GRS 1758-258 did not go to the high state in 1993. We offer an interpretation based on the ADAF model for a system with mdot ltsim mdot_crit. We find the 1990-1993 coeval hard and soft X-ray observations support the ADAF predictions. We discuss a new way to constrain black-hole mass with spectral data and the ADAF theory, and apply this technique to GRS 1758-258 to find M_1 gtsim 8--9 M_sol at an assumed distance of 8.5 kpc. Further investigations of the ADAF model allow us to evaluate the model critically against the data and flux-flux diagram of Barret, McClintock & Grindlay (1996) and to understand the limits of the latter’s ``X-ray burster box.’’ | | Source: | arXiv, astro-ph/0108111 | | Services: | Forum | Review | PDF | Favorites | |
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