Results 51 to 60 of about 9,171,233 (161)

Ultraluminous X-ray sources in the first eROSITA survey

Astronomy & Astrophysics
Context. Ultraluminous X-ray sources (ULXs) are luminous non-nuclear X-ray point sources embedded in galaxies. Their luminosities exceeding 1039 erg s−1 potentially require sub-Eddington accretion by objects with masses from ∼102 M⊙ to ∼104 M⊙ or ...
Weber P., Roberts T. P., Hämmerich S., Kyritsis E., Zezas A., Mayer M. G. F., Zainab A., Kreykenbohm I., Merloni A., Sasaki M., Schwope A., Middleton M., Basu-Zych A., Hornschemeier A., Vulic N., Salvato M., Webb N., Tranin H., Schettino N., Kirsch C., Saeedi S., Zangrandi F., Lorenz M., Dauner L., Dauser T., Haberl F., Maitra C., Igo Z., Santangelo A., Ducci L., Wilms J.   +30 more
doaj   +1 more source

X-ray reflection in a sample of X-ray bright ultraluminous X-ray sources [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
We apply a reflection-based model to the best available XMM-Newton spectra of X-ray bright UltraLuminous X-ray (ULX) sources (NGC 1313 X-1, NGC 1313 X-2, M 81 X-6, Holmberg IX X-1, NGC 5408 X-1 and Holmberg II X-1). A spectral drop is apparent in the data of all the sources at energies 6-7 keV.
Caballero-Garcia, M. D., Fabian, A. C.
openaire   +2 more sources

Unlocking the nature of ultraluminous X‐ray sources using their X‐ray spectra [PDF]

Astronomische Nachrichten, 2011
AbstractWe explore the nature of ultraluminous X‐ray sources through detailed investigations of their spectral shape using some of the highest quality data available in the XMM‐Newton public archives. Phenomenological models allow us to characterise their spectra, while more ‘physically‐motivated’ models enable us to explore the physical processes ...
Gladstone, J.C., Roberts, T.P., Done, C.
openaire   +3 more sources

The ultraluminous X-ray source bubble in NGC 5585 [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT Some ultraluminous X-ray sources (ULXs) are surrounded by collisionally ionized bubbles, larger and more energetic than supernova remnants: they are evidence of the powerful outflows associated with super-Eddington X-ray sources.
R Soria, M W Pakull, C Motch, J C A Miller-Jones, A D Schwope, R T Urquhart, M S Ryan   +6 more
openaire   +4 more sources

Modeling the Emission and Polarization Properties of Pulsating Ultraluminous X‐Ray Sources

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT Pulsating Ultraluminous X‐ray Sources (PULXs) are a class of extragalactic sources with high X‐ray luminosity, in excess of 1039$$ {10}^{39} $$ erg s−1$$ {\mathrm{s}}^{-1} $$, and showing pulsations that associate them with neutron stars accreting at a super‐Eddington rate.
S. Conforti, L. Zampieri, R. Taverna, R. Turolla, N. Brice, F. Pintore, G. L. Israel   +6 more
wiley   +1 more source

Optical & X-ray Studies of Ultraluminous X-ray Sources [PDF]

, 2009
Ultraluminous X-ray Sources (ULXs) are point like X-ray sources situated external to the nucleus of their host galaxy, with inferred X-ray luminosities in excess of 10^{39} erg s^{−1} .
Gladstone, Jeanette Claire, GLADSTONE, JEANETTE,CLAIRE   +1 more
core  

Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto, J. F. Steiner, A. Bodaghee, P. Chakraborty, M. Sobolewska, D. R. Pasham, A. Ogorzalek, J. Zuhone, A. Bogdan, M. Vogelsberger   +9 more
wiley   +1 more source

Spectroscopy of optical counterparts of ultraluminous X-ray sources [PDF]

Astrophysical Bulletin, 2007
submitted to Astrophysical Bulletin (Bull. Special Astrophys. Obs.)
Abolmasov, P., Fabrika, S., Sholukhova, O., Afanasiev, V.   +3 more
openaire   +2 more sources

Chemical Evolution of the Universe and its Consequences for Gravitational‐Wave Astrophysics

Annalen der Physik, Volume 536, Issue 2, February 2024.
Population properties of double compact object mergers (especially binary black holes) are sensitive to the metallicity dependent cosmic star formation history. The uncertainty of this quantity cannot be ignored and makes the interpretation of current gravitational wave observations difficult.
Martyna Chruślińska
wiley   +1 more source

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   +1 more source