SIMBAD references

2005ApJ...630..228K - Astrophys. J., 630, 228-237 (2005/September-1)

M74 X-1 (CXOU J013651.1+154547): an extremely variable ultraluminous X-ray source.


Abstract (from CDS):

Ultraluminous X-ray sources (ULXs) have been described variously as the most luminous normal X-ray binaries, hypernovae, and ``intermediate-mass'' black holes with masses of hundreds to thousands of solar masses. We present results on M74 X-1 (CXOU J013651.1+154547), a ULX in the nearby spiral galaxy M74 (NGC 628), from observations by Chandra and XMM-Newton. M74 X-1 is a persistent source that exhibits extreme variability and changes in spectral state on timescales of several thousand seconds. Its variability timescales and behavior resemble some Galactic microquasars. This suggests that the emission mechanism may be related to relativistically beamed jets and that M74 X-1 could be an extragalactic ``microblazar''–a microquasar whose jet axis is aligned with our line of sight. We also note that its spectrum is consistent with the presence of a low-temperature disk blackbody component, which, assuming it is due to radiation from an accretion disk, could indicate that M74 X-1 contains an intermediate-mass black hole.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 628 - Galaxies: Individual: Messier Number: M74 - X-Rays: Individual: Alphanumeric: CXOU J013651.1+154547

Nomenclature: [KKG2005] M74 X-N (No. 1).

CDS comments: Parag. 4.1 : IRAS 13244-3809 is a misprint for 13224-3809

Simbad objects: 18

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