paper

High Resolution Imaging of the HeII lambda 4686 Emission Line Nebula Associated with the Ultraluminous X-Ray Source in Holmberg II

arXiv:astro-ph/0407031 · doi:10.1111/j.1365-2966.2004.08020.x

Abstract

We present Hubble Space Telescope images of the He{\sc iii} region surrounding the bright X-ray source in the dwarf irregular galaxy Holmberg II. Using {\it Chandra}, we find a position for the X-ray source of 08h 19m 28.98s, +70\arcdeg 42\arcmin 19.\arcsec3 (J2000) with an uncertainty of 0.6. We identify a bright, point-like optical counterpart centered in the nebula with the X-ray source. The optical magnitude and color of the counterpart are consistent with a star with spectral type between O4V and B3 Ib at a distance of 3.05 Mpc or reprocessed emission from an X-ray illuminated accretion disk. The nebular He{\sc ii} luminosity is . The morphology of the He{\sc ii}, H, and [O{\sc i}] emission are consistent with being due to X-ray photoionization and are inconsistent with narrow beaming of the X-ray emission. A spectral model consisting of a multicolor disk blackbody with inverse-Compton emission from a hot corona gives a good fit to X-ray spectra obtained with XMM-Newton. Using the fitted X-ray spectrum, we calculate the relation between the He{\sc ii} and X-ray luminosity and find that the He{\sc ii} flux implies a lower bound on the X-ray luminosity in the range 4 to if the extrapolation of the X-ray spectrum between 54 eV and 300 eV is accurate. A compact object mass of at least 25 to would be required to avoid violating the Eddington limit.

7 pages, one color figure; published in MNRAS

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