Journal Article

Broad [O <span class="smallCaps">iii</span>] in the globular cluster RZ 2109: X-ray ionized nova ejecta

E. Ripamonti and M. Mapelli

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 2, pages 1144-1153
Published in print June 2012 | ISSN: 0035-8711
Published online June 2012 | e-ISSN: 1365-2966 | DOI:
Broad [O iii] in the globular cluster RZ 2109: X-ray ionized nova ejecta

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We study the possibility that the very broad (∼1500 km s−1) and luminous (L5007∼ 1.4 × 1037 erg s−1) [O iii] line emission observed in the globular cluster RZ 2109 might be explained with the photoionization of nova ejecta by the bright (LX∼ 4 × 1039 erg s−1) 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 (≳0.5 × 10−3 M), 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.

Keywords: novae, cataclysmic variables; ISM: jets and outflows; galaxies: individual: NGC 4472; galaxies: star clusters: individual: RZ 2109; X-rays: binaries

Journal Article.  6121 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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