SIMBAD references

2007ApJ...668..124A - Astrophys. J., 668, 124-129 (2007/October-2)

Optical spectroscopy of the environment of a ULX in NGC 7331.

ABOLMASOV P.K., SWARTZ D.A., FABRIKA S., GHOSH K.K., SHOLUKHOVA O. and TENNANT A.F.

Abstract (from CDS):

Optical photometric and spectroscopic data are presented that show an association of an ultraluminous X-ray source in NGC 7331 with a young star cluster of mass M=(1.1±0.2)x105 M and age tc=4.25±0.25 Myr. If the ULX is part of the bright stellar cluster, then the mass of the progenitor of the compact accretor must have been ≳40-50 M in order to already have evolved through the supernova stage into a compact object. The companion star is also probably an evolved massive star. The emission-line spectrum of the nebula surrounding the cluster can be interpreted as being a result of photoionization by the cluster OB stars with an additional source of shock excitation producing strong [S II], [O I], and N II lines. This additional source appears to be as much as 5 times more powerful than the supernovae and stellar winds in the cluster can provide for. Additional mechanical energy input associated with the ULX itself can help explain the residual shock-excited line luminosities of the emission region.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 7331 - Galaxies: Star Clusters - Line: Formation - X-Rays: Binaries - X-Rays: Galaxies - X-rays: individual (CXOU J223706 (read: CXOU J223706.6+342620))

Simbad objects: 12

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2020.10.23-03:18:19

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