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 a novel strategy to uncover the Galactic population of quiescentblack holes (BHs). This is based on a new concept, the photometric massfunction (PMF), which opens up the possibility of an efficient identificationof dynamical BHs in large fields-of-view. This exploits the width of the discHalpha emission line, combined with orbital period information. We here showthat Halpha widths can be recovered using a combination of customized Halphafilters. By setting a width cut-off at 2200 km/s we are able to cleanly removeother Galactic populations of Halpha emitters, including ~99.9% of cataclysmicvariables (CVs). Only short period (Porb<2.1 h) eclipsing CVs and AGNs willcontaminate the sample but these can be easily flagged through photometricvariability and, in the latter case, also mid-IR colours. We also describe thestrategy of a deep (r=22) Galactic plane survey based on the concept of PMFs:HAWKs, the HAlpha-Width Kilo-deg Survey. We estimate that ~800 sqr deg arerequired to unveil ~50 new dynamical BHs, a three-fold improvement over theknown population. For comparison, a century would be needed to produce anenlarged sample of 50 dynamical BHs from X-ray transients at the currentdiscovery rate.

Hibernating black holes revealed by photometric mass functions