Results 121 to 130 of about 389,006 (267)
THE ULTRALUMINOUS X-RAY SOURCES NGC 1313 X-1 AND X-2: A BROADBAND STUDY WITH NuSTAR AND XMM-Newton [PDF]
, 2013 We present the results of NuSTAR and XMM-Newton observations of the two ultraluminous X-ray sources: NGC 1313 X-1 and X-2. The combined spectral bandpass of the two satellites enables us to produce the first spectrum of X-1 between 0.3 and 30 keV, while ...
M. Bachetti +18 more
semanticscholar +1 more source
Multiwavelength Observations of Ultraluminous X-Ray Sources [PDF]
Chinese Journal of Astronomy and Astrophysics, 2005 to appear in the Chinese Journal of Astronomy & ...
openaire +3 more sources
Soft X-Ray Transients as Ultraluminous X-Ray Sources [PDF]
Publications of the Astronomical Society of Japan, 2004 Abstract We discuss the possibility that the soft X-ray transient GRS 1915$+$105 evolved from a binary similar to V4641 Sgr (XTE J1819$-$254) by conservative mass-transfer, and estimate the possible mass-transfer rates during the evolution.
Chang-Hwan Lee, Gerald E. Brown
openaire +2 more sources
Direct Detection of an Ultraluminous Ultraviolet Source [PDF]
, 2010 We present Hubble Space Telescope observations in the far UV of the ultraluminous X-ray source in NGC 6946 associated with the optical nebula MF 16. Both a point-like source coincident with the X-ray source and the surrounding nebula are detected in the FUV. The point source has a flux of 5E-16 erg s^-1 cm^-2 Ang^-1 and the nebula has a flux of 1.6E-15
arxiv +1 more source
, 2009 Observations of hundreds of supersoft x-ray sources (SSSs) in external galaxies have shed light on the diversity of the class and on the natures of the sources.
Chiang +35 more
core +1 more source
SPECTRAL STATES AND EVOLUTION OF ULTRALUMINOUS X-RAY SOURCES [PDF]
The Astrophysical Journal, 2009 We examined spectral evolution in ultraluminous X-ray sources (ULXs) with apparent luminosities of about 10^40 ergs/s. Based on new results in this paper and those reported in the literature, two common spectral behaviors were found. Some ULXs in starburst galaxies have varying luminosity (L) but remain in the hard state with power-law spectra and a ...
Hua Feng, Hua Feng, Philip Kaaret
openaire +3 more sources
The X-Ray Spectral Evolution in X-Ray Binaries and Its Application to Constrain the Black Hole Mass of Ultraluminous X-Ray Sources [PDF]
, 2008 We investigate the relationship between the hard X-ray photon index Γ and the Eddington ratio [ξ = LX(0.5–25 keV)/LEdd] in six X-ray binaries (XRBs) with well-constrained black hole masses and distances.
Qingwen Wu, M. Gu
semanticscholar +1 more source
Preheating of the early Universe by radiation from high-mass X-ray binaries
, 2016 Using a reliably measured intrinsic (i.e. corrected for absorption effects) present-day luminosity function of high-mass X-ray binaries (HMXBs) in the 0.25-2 keV energy band per unit star-formation rate, we estimate the preheating of the early Universe ...
Khabibullin, Ildar, Sazonov, Sergey
core +1 more source
The Astrophysical JournalWe searched the Chandra and XMM archives for 900 Green Pea galaxies to identify signs of active galactic nuclei (AGN). Green peas are low-mass, emission-line galaxies that resemble high-redshift dwarf galaxies. From 29 observations, we detected X-rays in
Mainak Singha +10 more
doaj +1 more source
X-ray Variability from the Ultraluminous Black Hole Candidate X-ray Binary in the Globular Cluster RZ 2109 [PDF]
, 2018 We present the results of long-term monitoring of the X-ray emission from the ultraluminous X-ray source XMMUJ122939.9+075333 in the extragalactic globular cluster RZ2109. The combination of the high X-ray luminosity, short term X-ray variability, X-ray spectrum, and optical emission suggest that this system is likely an accreting black hole in a ...
arxiv +1 more source