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An Off-Nucleus Nonstellar Black Hole in the Seyfert Galaxy NGC 5252
- Source :
- NASA Astrophysics Data System
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Abstract
- We report the discovery of a ultraluminous X-ray source (ULX; CXO J133815.6+043255) in NGC 5252. This ULX is an off-nuclear point-source, which is 22$^{\prime\prime}$ away from the center of NGC 5252, and has an X-ray luminosity of 1.5 $\times$ $10^{40}$erg s$^{-1}$. It is one of the rare examples of ULX, which exhibits clear counterparts in radio, optical, UV bands. Follow-up optical spectrum of the ULX shows strong emission lines. The redshift of [O III] emission line coincides with the systematic velocity of NGC 5252, suggesting the ULX is gravitationally bound to NGC 5252. The flux of [O III] appears to be correlated with both X-ray and radio luminosity in the same manner as ordinary AGNs, indicating that the [O III] emission is intrinsically associated with the ULX. Based on the multiwavelength data, we argue that the ULX is unlikely to be a background AGN. A more likely option is an accreting BH with a black hole mass of $\geq 10^4M_\odot$, which might be a stripped remnant of a merging dwarf galaxy.<br />To appear in ApJ
- Subjects :
- Physics
galaxie [X-rays]
Astrophysics::High Energy Astrophysical Phenomena
Center (category theory)
Doubly ionized oxygen
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
black hole physic
Astrophysics - Astrophysics of Galaxies
Galaxy
Redshift
Luminosity
Black hole
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
individual (NGC 5252) [galaxies]
Astrophysics::Solar and Stellar Astrophysics
Emission spectrum
Astrophysics::Galaxy Astrophysics
Dwarf galaxy
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- NASA Astrophysics Data System
- Accession number :
- edsair.doi.dedup.....044479f6f452c40e169b77f53b4542f0