VELOCITY STRUCTURE AND VARIABILITY OF [O III] EMISSION IN BLACK HOLE HOST GLOBULAR CLUSTER RZ2109
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States)
- School of Physics and Astronomy, University of Southampton, Southampton, Hampshire S017 1BJ (United Kingdom)
We present a multi-facility study of the optical spectrum of the extragalactic globular cluster RZ2109, which hosts a bright black hole X-ray source. The optical spectrum of RZ2109 shows strong and very broad [O III] {lambda}{lambda}4959, 5007 emission in addition to the stellar absorption lines typical of a globular cluster. We use observations over an extended period of time to constrain the variability of these [O III] emission lines. We find that the equivalent width of the lines is similar in all of the data sets; the change in L[O III] {lambda}5007 is {approx}<10% between the first and last observations, which were separated by 467 days. The velocity profile of the line also shows no significant variability over this interval. Using a simple geometric model, we demonstrate that the observed [O III] {lambda}5007 line velocity structure can be described by a two-component model with most of the flux contributed by a bipolar conical outflow of about 1600 km s{sup -1}, and the remainder from a Gaussian component with an FWHM of several hundred km s{sup -1}.
- OSTI ID:
- 21587466
- Journal Information:
- Astrophysical Journal, Vol. 739, Issue 2; Other Information: DOI: 10.1088/0004-637X/739/2/95; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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