Long-term X-ray variability of ultraluminous X-ray sources
نویسندگان
چکیده
منابع مشابه
Ultraluminous X-ray Sources
The Chandra X-Ray Observatory was used to image the collisional ring galaxy Arp 147 for 42 ks. We detect nine X-ray sources with luminosities in the range of (1.4–7) × 1039 erg s−1 (assuming that the sources emit isotropically) in or near the blue knots of star formation associated with the ring. A source with an X-ray luminosity of 1.4 × 1040 erg s−1 is detected in the nuclear region of the in...
متن کاملX-ray Monitoring of Ultraluminous X-ray Sources
X-ray monitoring observations were performed with the Swift observatory of the ultraluminous Xray sources Holmberg IX X-1, NGC 5408 X-1, and NGC 4395 X-2 and also of the nuclear X-ray source in NGC 4395. Holmberg IX X-1 remains in the hard X-ray spectral state as its flux varies by a factor of 7 up to an (isotropic) luminosity of 2.8 × 10 erg s. This behavior may suggest an unusually massive co...
متن کاملX-ray observations of ultraluminous X-ray sources
Ultraluminous X-ray sources (ULXs) are amongst the most intriguing of X-ray source classes. Their extreme luminosities greater than 10 erg s in the 0.3 – 10 keV band alone suggest either the presence of black holes larger than those regularly encountered in our own Galaxy (the Galactic centre excepted), or sources apparently radiating well above the Eddington limit. We review the insights affor...
متن کاملX-ray Time and Spectral Variability as Probes of Ultraluminous X-ray Sources
Title of dissertation: X-RAY TIME AND SPECTRAL VARIABILITY AS PROBES OF ULTRALUMINOUS X-RAY SOURCES Dheeraj Ranga Reddy Pasham, Doctor of Philosophy, 2014 Dissertation directed by: Professor Coleman Miller Department of Astronomy A long-standing debate in the field of ultraluminous X-ray sources (ULXs: luminosities & 3×1039 ergs s) is whether these objects are powered by stellarmass black holes...
متن کاملVariability of ultraluminous X-ray sources in the Cartwheel Ring
The Cartwheel is one of the most outstanding examples of a dynamically perturbed galaxy where star formation is occurring inside the ring–like structure. In previous studies with Chandra, we detected 16 Ultra Luminous X-ray sources lying along the southern portion of the ring. Their Luminosity Function is consistent with them being in the high luminosity tail of the High Mass X-ray Binaries dis...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2015
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stv2025