Accretion states of the Galactic microquasar GRS 1758-258
We present the results of a radio and X-ray study of the Galactic microquasar GRS 1758−258, using unpublished archival data and new observations. We focus in particular on the 2000–2002 state transitions, and on its more quiet behaviour in 2008–2009. Our spectral and timing analysis of the XMM–Newto...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
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Wiley-Blackwell Publishing Ltd.
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/40861 |
| _version_ | 1848755984503144448 |
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| author | Soria, Roberto Broderick, J. Hao, J. Hannikainen, D. Mehdipour, M. Pottschmidt, K. Zhang, S. |
| author_facet | Soria, Roberto Broderick, J. Hao, J. Hannikainen, D. Mehdipour, M. Pottschmidt, K. Zhang, S. |
| author_sort | Soria, Roberto |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present the results of a radio and X-ray study of the Galactic microquasar GRS 1758−258, using unpublished archival data and new observations. We focus in particular on the 2000–2002 state transitions, and on its more quiet behaviour in 2008–2009. Our spectral and timing analysis of the XMM–Newton data shows that the source was in the canonical intermediate, soft and hard states in 2000 September 19, 2001 March 22 and 2002 September 28, respectively. We estimate the disc size, luminosity and temperature, which are consistent with a black hole mass ~10 M\astrosun. There is much overlap between the range of total X-ray luminosities (on average ~0.02L Edd) in the hard and soft states, and probably between the corresponding mass accretion rates; in fact, the hard state is often more luminous. The extended radio lobes seen in 1992 and 1997 are still present in 2008–2009. The 5-GHz radio core flux density has shown variability between ~0.1 and 0.5 mJy over the last two decades. This firmly places GRS 1758−258 in the radio-quiet sequence of Galactic black holes, in the radio/X-ray plane. We note that this dichotomy is similar to the dichotomy between the radio/X-ray sequences of Seyfert and radio galaxies. We propose that the different radio efficiency of the two sequences is due to relativistic electron/positron jets in radio-loud black holes, and subrelativistic, thermally dominated outflows in radio-quiet sources. |
| first_indexed | 2025-11-14T09:04:59Z |
| format | Journal Article |
| id | curtin-20.500.11937-40861 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:04:59Z |
| publishDate | 2011 |
| publisher | Wiley-Blackwell Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-408612017-09-13T15:59:55Z Accretion states of the Galactic microquasar GRS 1758-258 Soria, Roberto Broderick, J. Hao, J. Hannikainen, D. Mehdipour, M. Pottschmidt, K. Zhang, S. We present the results of a radio and X-ray study of the Galactic microquasar GRS 1758−258, using unpublished archival data and new observations. We focus in particular on the 2000–2002 state transitions, and on its more quiet behaviour in 2008–2009. Our spectral and timing analysis of the XMM–Newton data shows that the source was in the canonical intermediate, soft and hard states in 2000 September 19, 2001 March 22 and 2002 September 28, respectively. We estimate the disc size, luminosity and temperature, which are consistent with a black hole mass ~10 M\astrosun. There is much overlap between the range of total X-ray luminosities (on average ~0.02L Edd) in the hard and soft states, and probably between the corresponding mass accretion rates; in fact, the hard state is often more luminous. The extended radio lobes seen in 1992 and 1997 are still present in 2008–2009. The 5-GHz radio core flux density has shown variability between ~0.1 and 0.5 mJy over the last two decades. This firmly places GRS 1758−258 in the radio-quiet sequence of Galactic black holes, in the radio/X-ray plane. We note that this dichotomy is similar to the dichotomy between the radio/X-ray sequences of Seyfert and radio galaxies. We propose that the different radio efficiency of the two sequences is due to relativistic electron/positron jets in radio-loud black holes, and subrelativistic, thermally dominated outflows in radio-quiet sources. 2011 Journal Article http://hdl.handle.net/20.500.11937/40861 10.1111/j.1365-2966.2011.18714.x Wiley-Blackwell Publishing Ltd. fulltext |
| spellingShingle | Soria, Roberto Broderick, J. Hao, J. Hannikainen, D. Mehdipour, M. Pottschmidt, K. Zhang, S. Accretion states of the Galactic microquasar GRS 1758-258 |
| title | Accretion states of the Galactic microquasar GRS 1758-258 |
| title_full | Accretion states of the Galactic microquasar GRS 1758-258 |
| title_fullStr | Accretion states of the Galactic microquasar GRS 1758-258 |
| title_full_unstemmed | Accretion states of the Galactic microquasar GRS 1758-258 |
| title_short | Accretion states of the Galactic microquasar GRS 1758-258 |
| title_sort | accretion states of the galactic microquasar grs 1758-258 |
| url | http://hdl.handle.net/20.500.11937/40861 |