Velocity Structure and Variability of [O III] Emission in Black Hole Host Globular Cluster RZ2109

Abstract

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]λλ4959,5007 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 datasets; the change in L[O III]λ5007 is \ltsim 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]λ5007 line velocity structure can be described by a two component model with most of the flux contributed by a bipolar conical outflow of about 1,600 km/s, and the remainder from a Gaussian component with a FWHM of several hundred km/s.

20 pages, 6 figures, 1 table. ApJ accepted

References in corpus (7)

• Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting
• Very Broad [O III]4959,5007 Emission from the NGC 4472 Globular Cluster RZ2109 and Implications for the Mass of Its Black Hole X-ray Source
• [OIII] 5007 Emission from the Black-Hole X-ray Binary in a NGC 4472 Globular Cluster
• Shrinking the Braneworld: Black Hole in a Globular Cluster
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• Multi-epoch spectroscopy of the globular cluster black hole in NGC 4472
• Broad and Luminous [OIII] and [NII] in Globular Cluster ULXs

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