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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We have analyzed a 90 ksec long observation of the bright nucleus of M33 madewith Chandra/ACIS. We detected low-amplitude (~sim10%) highly significantvariability on timescales of ~5000 sec. We also find associated spectralvariability. The two main spectral components (a power-law with \Gamma~2 and amulticolor disk -MCD- with kT~0.9-1.2 keV) vary in relative flux. The MCDtemperature also increases with increasing MCD flux. The pattern of variabilityis reminiscent of (but not identical to) galactic black hole binaries. A ~5M$_{\odot}$ accreting black hole may explain this source.Comment: Accepted for publication on The Astrophysical Journal. 14 pages, 5  figure

Spectral Variability of the Nucleus of M33 in aChandra/ACIS Observation