Other
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..204z&link_type=abstract
NOAO Proposal ID #2009A-0204
Other
Scientific paper
We propose to obtain GMOS spectra of the black hole-hosting globular cluster RZ2109. X-ray observations have shown that this globular cluster in the Virgo elliptical NGC 4472 hosts the only known black-hole X-ray binary in a globular cluster. Recently, we used exploratory Keck LRIS exposures at low spectral resolution (R ~ 400) to show that this globular cluster source has remarkably broad [OIII]4959, 5007 lines, with velocity widths of approximately 2,000km/s . Further, no other strong emission lines are observed, suggesting a large [OIII]/H(beta) ratio. Here we propose to obtain deep GMOS spectroscopy at significantly higher spectral resolution. We will use these data to - 1) determine the line profile of the broad [OIII]4959, 5007 lines. This is key for understanding the geometry of the [OIII] emitting region, 2) significantly improve the determination of the Balmer emission line luminosity and velocity width, using the higher spectral resolution and signal-to-noise to better characterize the underlying stellar Balmer absorption from the globular cluster stars, -3) either measure or place much more stringent limits on the line luminosities for other key diagnostic lines, such as [OIII]4363, and -4) test for variability in the [OIII]4959, 5007 emission lines by comparing the proposed data with the earlier exploratory observations.
Kundu Arunav
Maccarone Tom
Rhode Katherine
Salzer John Joseph
Steele Matthew
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