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The nature of ultraluminous X-ray sources in NGC 4565
Wu, H; Xue, SJ; Xia, XY; Deng, ZG; Mao, S
AbstractWe report the optical identifications of two X-ray-luminous point sources in the spiral galaxy NGC 4565 based on archive data of Chandra and the Hubble Space Telescope. The central X-ray point source, RX J1236.3+2559, is found to be the nucleus of NGC 4565 with an X-ray luminosity of L-X approximate to 4.3 x 10(39) ergs s(-1). We show that its multiband properties are consistent with its being a low-luminosity active galactic nucleus. A faint optical counterpart with B approximate to 25.1 and I approximate to 24.0 was identified for the off-nucleus X-ray point source, RX J1236.2+2558. Its extinction-corrected B magnitude is estimated to be 24.5. The X-ray to optical flux ratio (f(X)/f(B)) is about 540. From the optical and X-ray properties, we argue that RX J1236.2+2558 is an ultraluminous X-ray compact source with L-X approximate to 6.5 x 10(39) ergs s(-1). The source is probably located in a faint globular cluster at the outer edge of NGC 4565's bulge.
KeywordGalaxies : Individual (Ngc 4565) Galaxies : Nuclei X-rays : Galaxies
Indexed BySCI
WOS IDWOS:000177804800011
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Tianjin Normal Univ, Dept Phys, Tianjin 300074, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China
4.Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
Recommended Citation
GB/T 7714
Wu, H,Xue, SJ,Xia, XY,et al. The nature of ultraluminous X-ray sources in NGC 4565[J]. ASTROPHYSICAL JOURNAL,2002,576(2):738-744.
APA Wu, H,Xue, SJ,Xia, XY,Deng, ZG,&Mao, S.(2002).The nature of ultraluminous X-ray sources in NGC 4565.ASTROPHYSICAL JOURNAL,576(2),738-744.
MLA Wu, H,et al."The nature of ultraluminous X-ray sources in NGC 4565".ASTROPHYSICAL JOURNAL 576.2(2002):738-744.
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