SIMBAD references

2006MNRAS.372.1531S - Mon. Not. R. Astron. Soc., 372, 1531-1539 (2006/November-2)

A ultraluminous X-ray source associated with a cloud collision in M 99.


Abstract (from CDS):

The Sc galaxy M99 in the Virgo Cluster has been strongly affected by tidal interactions and recent close encounters, responsible for an asymmetric spiral pattern and a high star formation rate. Our XMM-Newton study shows that the inner disc is dominated by hot plasma at kT ~ 0.30 keV, with a total X-ray luminosity of ~1041erg/s in the 0.3-12 keV band. At the outskirts of the galaxy, away from the main star-forming regions, there is an ultraluminous X-ray source (ULX) with an X-ray luminosity of ~2x1040erg/s and a hard spectrum well fitted by a power law of photon index Γ ~ 1.7. This source is close to the location where a massive Hi cloud appears to be falling on to the M99 disc at a relative speed of >100km/s. We suggest that there may be a direct physical link between fast cloud collisions and the formation of bright ULXs, which may be powered by accreting black holes with masses ∼100M. External collisions may trigger large-scale dynamical collapses of protoclusters, leading to the formation of very massive (≳200M) stellar progenitors; we argue that such stars may later collapse into massive black holes if their metal abundance is sufficiently low.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): black hole physics - galaxies: individual: NGC4254 - radio lines: galaxies - X-rays: binaries - X-rays: galaxies

Nomenclature: Table 1: [SW2006b] N (Nos 1-5).

CDS comments: Fig.4: Small young clusters of OB stars are not identified in SIMBAD.

Simbad objects: 38

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