Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21941501i&link_type=abstract
American Astronomical Society, AAS Meeting #219, #415.01
Astronomy and Astrophysics
Astronomy
Scientific paper
In previous studies, we have presented evidence that the ultraluminous X-ray source CXOJ033831.8-352604 within a luminous globular cluster of the Fornax elliptical galaxy NGC1399 represented the aftermath of a tidal disruption event by an intermediate-mass black hole within the globular cluster. This intriguing source exhibited X-ray variability, and more importantly, strong [O III] and [N II] emission that we postulate emanates from the X-ray photoionization of the debris from a disrupted white dwarf or horizontal branch star that was town apart by the IMBH. Here, we present Gemini GMOS spectra of the source to search for [O II] emission from the line-emitting debris. We also determine an X-ray spectrum for the source from a long archival XMM-Newton observation. Finally, we compare our line ratios to a suite of tailored simulations of the tidal disruption of a horizontal branch star by a 100 solar mass black hole and find good agreement, supporting our IMBH-tidal disruption scenario.
Chiboucas Kristin
Clausen Drew
Dupke Renato
Eracleous Michael
Irwin Jimmy
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