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Radio and X-Ray Observations of the 1998 Outburst of the Recurrent X-Ray Transient 4U 1630-47
journal contribution
posted on 2023-05-16, 11:48 authored by Hjellming, RM, Rupen, MP, Mioduszewski, AJ, Kuulkers, E, McCollough, M, Harmon, BA, Buxton, M, Sood, R, Tzioumis, A, Rayner, DP, Dieters, S, Durouchoux, PWe report radio (NRAO VLA and Australia Telescope Compact Array), soft X-ray (Rossi X-Ray Timing Explorer ASM), and hard X-ray (Compton Gamma Ray Observatory BATSE) observations of a 1998 outburst in the recurring X-ray transient 4U 1630-47, where radio emission was detected for the first time. The radio observations identify the position of 4U 1630-47 to within 1″. Because the radio emission is optically thin with a spectral index of ∼-0.8 during the rise, peak, and decay of the initial radio event, the emission is probably coming from an optically thin radio jet ejected over a period of time. The 20-100 keV emission first appeared 1998 January 28 (MJD 50841), the 2-12 keV emission first appeared 1998 February 3 (MJD 50847), and the first radio emission was detected 1998 February 12.6 (MJD 50856.6). The rise of the radio emission probably began about 1998 February 7 (MJD 50851) when the X-rays were in a very hard fluctuating-hardness state, just before changing to a softer, more stable hardness state.
History
Publication title
The Astrophysical JournalVolume
514Pagination
383-387ISSN
0004-637XDepartment/School
School of Natural SciencesPublisher
The University of Chicago PressPlace of publication
ChicagoRepository Status
- Restricted