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

A likely tidal disruption of a star by the intermediate-mass black hole(IMBH) of a dwarf galaxy was recently identified in association with Abell1795. Without deep spectroscopy for this very faint object, however, thepossibility of a more massive background galaxy or even a disk-instabilityflare from a weak AGN could not be dismissed. We have now obtained 8 hours ofGemini spectroscopy which unambiguously demonstrate that the host galaxy isindeed an extremely low-mass $(M_\ast\sim 3\times 10^8\; {\rm M}_{\odot})$galaxy in Abell 1795, comparable to the least-massive galaxies determined tohost IMBHs via other studies. We find that the spectrum is consistent with theX-ray flare being due to a tidal disruption event rather than an AGN flare. Wealso set improved limits on the black hole mass $({\rm log}[M_{\bullet}/{\rmM}_{\odot}] \sim 5.3 - 5.7)$ and infer a 15-year X-ray variability of a factorof $> 10^4$. The confirmation of this galaxy-black hole system provides aglimpse into a population of galaxies that is otherwise difficult to study, dueto the galaxies' low masses and intrinsic faintness, but which may be importantcontributors to the tidal disruption rate.

Deep Spectroscopy of the $M_V\sim -14.8$ Host Galaxy of a Tidal Disruption Flare in A1795