Broad [OIII] in the globular cluster RZ 2109: X-ray ionized nova ejecta?

Abstract

We study the possibility that the very broad (~1500 km/s) and luminous (L_5007 ~ 1.4e37 erg/s) [OIII] line emission observed in the globular cluster RZ 2109 might be explained with the photoionization of nova ejecta by the bright (L_X ~ 4e39 erg/s) X-ray source hosted in the same globular cluster. We find that such scenario is plausible and explains most of the features of the RZ 2109 spectrum (line luminosity, absence of H emission lines, peculiar asymmetry of the line profile); on the other hand, it requires the nova ejecta to be relatively massive (>~ 0.5e-3 Msun}), and the nova to be located at a distance <~ 0.1 pc from the X-ray source. We also predict the time evolution of the RZ 2109 line emission, so that future observations can be used to test this scenario.

11 pages, 2 figures, 6 tables; accepted for publication on MNRAS

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Cited by in corpus (8)

• Tidal Disruptions of White Dwarfs: Theoretical Models and Observational Prospects
• Supersoft X-rays reveal a classical nova in the M 31 globular cluster Bol 126
• A variable ultraluminous X-ray source in a globular cluster in NGC 4649
• Luminous [O III] and [N II] from Tidally Disrupted Horizontal Branch Stars
• Spatially resolved spectroscopy of the globular cluster RZ 2109 and the nature of its black hole
• Slow Decline and Rise of the Broad [OIII] Emission Line in Globular Cluster Black Hole Candidate RZ2109
• Recurrent X-ray flares of the black hole candidate in the globular cluster RZ 2109 in NGC 4472
• An Extreme Ultra-Compact X-ray Binary in a Globular Cluster: Multi-Wavelength Observations of RZ2109 Explored in a Triple System Framework