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

Ultra-luminous X-ray sources are extragalactic objects located outside thenucleus of the host galaxy with bolometric luminosities >10^39 erg s^-1. Theseextreme luminosities - if the emission is isotropic and below the theoretical(i.e. Eddington) limit, where the radiation pressure is balanced by thegravitational pressure - imply the presence of an accreting black hole with amass of ~10^2-10^5 times that of the Sun. The existence of such intermediatemass black holes is in dispute, and though many candidates have been proposed,none are widely accepted as definitive. Here we report the detection of avariable X-ray source with a maximum 0.2-10 keV luminosity of up to 1.2 x 10^42erg s^-1 in the edge-on spiral galaxy ESO 243-49, with an implied conservativelower limit of the mass of the black hole of ~500 Msun. This finding presentsthe strongest observational evidence to date for the existence of intermediatemass black holes, providing the long sought after missing link between thestellar mass and super-massive black hole populations.

An Intermediate-mass Black Hole of Over 500 Solar Masses in the Galaxy ESO 243-49