2003/12/31 by Zhongli Zhang, T. Kiang, Haiguang Xu +2 · 12 citations
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Elliptical galaxy #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Luminosity #Physics #Point source #X-ray #astro-ph
paper · pdf · doi:10.1088/1009-9271/4/3/221
published in 天文和天体物理学研究：英文版 4(3), 221-230 · 11 pages, 6 figures
openalex publication_date 2004/06/01 · arxiv created 2004/06/02 · arxiv updated 2013/03/11 · openalex created_date 2017/05/12 · openalex updated_date 2026/08/05
With the Chandra pointing observation of about 50 ks, we have detected 41 point sources in the X-ray relatively faint elliptical galaxy NGC 1407, most of which appear to be low mass X-ray binaries. In luminosity flux units, these resolved point sources contribute about 17.8 % of the total emission of the galaxy in 0.3–10 keV. Of the remaining diffuse emission, about 53.4 % (or 43.9 % of total) may arise from unresolved point sources. We find six ultraluminous X-ray sources with luminosities above 10 39 erg s −1 . This number is less than has been found in NGC 720, but more than in NGC 4697 and NGC 1553, so suggesting a possible correlation between the number of ULXs and the total X-ray luminosity of early-type galaxies. A central point-like source is detected whose luminosity (2.36 ± 0.14 × 10 39 erg s −1 ) is the highest among all resolved sources. However, because of its relatively low hardness ratio, we speculate that it is not likely to be a low luminosity AGN.