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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present the largest-scale comparison to date between observedextragalactic X-ray binary (XRB) populations and theoretical models of theirproduction. We construct observational X-ray luminosity functions (oXLFs) usingChandra observations of 12 late-type galaxies from the Spitzer Infrared NearbyGalaxy Survey (SINGS). For each galaxy, we obtain theoretical XLFs (tXLFs) bycombining XRB synthetic models, constructed with the population synthesis codeStarTrack, with observational star formation histories (SFHs). We identifyhighest-likelihood models both for individual galaxies and globally, averagedover the full galaxy sample. Individual tXLFs successfully reproduce about halfof oXLFs, but for some galaxies we are unable to find underlying sourcepopulations, indicating that galaxy SFHs and metallicities are not well matchedand/or XRB modeling requires calibration on larger observational samples. Giventhese limitations, we find that best models are consistent with a product ofcommon envelope ejection efficiency and central donor concentration ~=0.1, anda 50% uniform -- 50% "twins" initial mass-ratio distribution. We present anddiscuss constituent subpopulations of tXLFs according to donor, accretor andstellar population characteristics. The galaxy-wide X-ray luminosity due tolow-mass and high-mass XRBs, estimated via our best global model tXLF, followsthe general trend expected from the L_x - star formation rate and L_x - stellarmass relations of Lehmer et al 2010. Our best models are also in agreement withmodeling of the evolution both of XRBs over cosmic time and of the galaxy X-rayluminosity with redshift.

Modeling X-ray binary evolution in normal galaxies: Insights from SINGS