English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

(abridged) In this paper, we examined XMM Newton EPIC spectra of 14ultra-luminous X-ray sources (ULXs)in addition to the XMM RGS spectra of twosources (Holmberg II X-1 and Holmberg IX X-1). We determined oxygen and ironabundances of the host galaxy's interstellar medium (ISM) using K-shell (O) andL-shell (Fe) X-ray photo-ionization edges towards these ULXs. We found that theoxygen abundances closely matched recent solar abundances for all of oursources, implying that ULXs live in similar local environments despite the widerange of galaxy host properties. Also, we compare the X-ray hydrogen columndensities (n_H) for 8 ULX sources with column densities obtained from radio H Iobservations. The X-ray model n_H values are in good agreement with the H I n_Hvalues, implying that the hydrogen absorption towards the ULXs is not local tothe source (with the exception of the source M81 XMM1). In order to obtain thecolumn density and abundance values, we fit the X-ray spectra of the ULXs witha combined power law and one of several accretion disk models. We tested theabundances obtained from the XSPEC models bbody, diskbb, grad, and diskpn alongwith a power law, finding that the abundances were independent of the thermalmodel used. We comment on the physical implications of these different modelfits. We also note that very deep observations allow a breaking of thedegeneracy noted by Stobbart et al. (2006) favoring a high mass solution forthe absorbed grad + power law model.Comment: 18 pages, accepted to Ap

Elemental Abundances of Nearby Galaxies through High Signal‐to‐Noise RatioXMM‐NewtonObservations of Ultraluminous X‐Ray Sources