Broad absorption-line time variability in the QSO CSO 203
We present spectroscopy of the BALQSO CSO 203 during four epochs over a 17-month time span. These data show three distinct levels in the broad absorption lines (BALs) of Si IV 1397A and C IV 1549A. We also note possible variations in the N V 1240A and Al III 1857A absorption troughs. A broad-band mo...
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| Veröffentlicht in: | The Astrophysical journal 1992-09, Vol.397 (1), p.81-87 |
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| container_title | The Astrophysical journal |
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| creator | Barlow, Thomas A. Junkkarinen, Vesa T. Burbidge, E. M. Weymann, Ray J. Morris, Simon L. Korista, Kirk T. |
| description | We present spectroscopy of the BALQSO CSO 203 during four epochs over a 17-month time span. These data show three distinct levels in the broad absorption lines (BALs) of Si IV 1397A and C IV 1549A. We also note possible variations in the N V 1240A and Al III 1857A absorption troughs. A broad-band monitoring effort during this period shows that the continuum level remained constant to within 10 percent. We argue that the triggering mechanism for the absorption-line changes is most likely synchronous with the continuum source photons; however, no correlation with the central source has yet been found. The observed variations are consistent with changes in the ionization level in the broad absorption-line region (BALR). We discuss possible mechanisms for these changes and the implications for the structure of the BALR. |
| doi_str_mv | 10.1086/171768 |
| format | Article |
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The observed variations are consistent with changes in the ionization level in the broad absorption-line region (BALR). We discuss possible mechanisms for these changes and the implications for the structure of the BALR.</description><subject>Astronomy</subject><subject>Astrophysics</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Quasars</subject><subject>Quasars. Active or peculiar galaxies, objects, and systems</subject><subject>Stellar systems. Galactic and extragalactic objects and systems. 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We argue that the triggering mechanism for the absorption-line changes is most likely synchronous with the continuum source photons; however, no correlation with the central source has yet been found. The observed variations are consistent with changes in the ionization level in the broad absorption-line region (BALR). We discuss possible mechanisms for these changes and the implications for the structure of the BALR.</abstract><cop>Legacy CDMS</cop><pub>University of Chicago Press</pub><doi>10.1086/171768</doi><tpages>7</tpages></addata></record> |
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| ispartof | The Astrophysical journal, 1992-09, Vol.397 (1), p.81-87 |
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| source | NASA Technical Reports Server; Alma/SFX Local Collection |
| subjects | Astronomy Astrophysics Earth, ocean, space Exact sciences and technology Quasars Quasars. Active or peculiar galaxies, objects, and systems Stellar systems. Galactic and extragalactic objects and systems. The universe |
| title | Broad absorption-line time variability in the QSO CSO 203 |
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