Results 61 to 70 of about 5,289 (173)

The Lack of Halo Ultraluminous X-Ray Sources [PDF]

The Astrophysical Journal, 2006
4 pages accepted to ...
openaire   +2 more sources

Ultraluminous X-Ray Sources in External Galaxies [PDF]

The Astrophysical Journal, 2001
4 pages, no figures; accepted for ApJ ...
King, Andrew R., Davies, Melvyn B., War, M.J., Fabbiaon, G., Elvis, M.   +4 more
openaire   +3 more sources

A Study of Spectral Variability Between Flaring and Nonflaring State in M74 X-1

The Astrophysical Journal
We conducted an extensive long-term spectral and timing study of the ultraluminous X-ray (ULX) source M74 X-1, using data taken between 2001 and 2021 by Chandra and XMM-Newton X-ray observatories.
Aman Upadhyay, Tanuman Ghosh, Vikram Rana   +2 more
doaj   +1 more source

Populations of Supersoft X-ray Sources: Novae, tidal disruption, Type Ia supernovae, accretion-induced collapse, ionization, and intermediate-mass black holes?

, 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, Cowley, Di Stefano, Di Stefano, Di Stefano, Di Stefano, Di Stefano, Di Stefano, Di Stefano, Esquej, Fabbiano, Fabbiano, Greiner, Henze, Ho, Kong, Kong, Kylafis, Langer, Loeb, Magorrian, Mukai, Orio, Orosz, Pakull, Pietsch, Prestwich, Rappaport, Rappaport, Rees, Remillard, Remillard, Soria, Ulmer, van den Heuvel, van Teeseling   +35 more
core   +1 more source

Seeking for the Leading Actor on the Cosmic Stage: Galaxies versus Supermassive Black Holes

, 2012
Advances in Astronomy, Volume 2012, Issue 1, 2012.
Angela Bongiorno, Francesco Shankar, Francesca Civano, Isabelle Gavignaud, Antonis Georgakakis   +4 more
wiley   +1 more source

Ultraluminous X-ray sources as neutrino pulsars [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
© The Author 2018. Published by Oxford University Press on behalf of The Royal Astronomical Society. The classical limit on the accretion luminosity of a neutron star is given by the Eddington luminosity. The advanced models of accretion on to magnetized neutron stars account for the appearance of magnetically confined accretion columns and allow the ...
Alexander A Mushtukov, Sergey S Tsygankov, Valery F Suleimanov, Juri Poutanen   +3 more
openaire   +7 more sources

Optical Emission from Luminous and Very Soft X-Ray Sources in Nearby Galaxies: Testing the Scenario of Edge-on Supercritical Accretion Systems

The Astrophysical Journal
Supercritical accretion onto compact objects is expected to drive optically thick winds, resulting in observed X-ray emission as a function of viewing angle.
Xiaohong Tang, Hua Feng
doaj   +1 more source

High-energy Neutrinos from Gamma-Ray-faint Accretion-powered Hypernebulae

The Astrophysical Journal, 2023
Hypernebulae are inflated by accretion-powered winds accompanying hyper-Eddington mass transfer from an evolved post-main-sequence star onto a black hole or neutron star companion.
Navin Sridhar, Brian D. Metzger, Ke Fang
doaj   +1 more source

Variability-selected low-luminosity active galactic nuclei candidates in the 7 Ms Chandra Deep Field-South [PDF]

, 2018
In deep X-ray surveys, active galactic nuclei (AGNs) with a broad range of luminosities have been identified. However, cosmologically distant low-luminosity AGN (LLAGN, $L_{\mathrm{X}} \lesssim 10^{42}$ erg s$^{-1}$) identification still poses a ...
Brandt, W. N., Ding, N., Gu, Q. S., Koekemoer, A. M., Lehmer, B. D., Luo, B., Paolillo, M., Schneider, D. P., Shemmer, O., Tozzi, P., Vignali, C., Vito, F., Wang, J. X., Xue, Y. Q., Yang, G., Zheng, X. C.   +15 more
core   +2 more sources

Radio Counterparts of Ultraluminous X-Ray Sources in Nearby Galaxies

The Astrophysical Journal
Radio surveys of ultraluminous X-ray sources (ULXs) allow us to find supercritically accreting compact objects (SS 433/W50-like systems) or stripped nuclear black holes in nearby galaxies. We identified 21 such objects by crossmatching a ULX catalog with
Yijia Zhang, Hua Feng, Ailing Wang, Roberto Soria   +3 more
doaj   +1 more source