Results 11 to 20 of about 214,668 (294)

Precession in transient X-ray sources [PDF]

Nature, 1975
THE origin of both the relatively long period and the transient nature of the recently discovered X-ray sources Ariel 1118−61 (ref. 1) and Ariel 0535+26 (ref. 2), with pulse periods of about 405 and 104 s, respectively, and decay times of days, is unclear. The pulse rate of A1118−61 has been attributed to an extremely short binary star orbital period3,
openaire   +3 more sources

Millenium Year X-ray Transients in Andromeda Galaxy [PDF]

, 2001
We study three transient X-ray sources, that were bright in the central region of M31 galaxy in the year 2000. Observations with Chandra and XMM-Newton allowed us for the first time in the history of X-ray astronomy, to build light curves of transient ...
Konstantin N. Borozdin, Revnivtsev M., Sergey P. Trudolyubov, Sunyaev R. A., Supper R., William C. Priedhorsky   +5 more
core   +2 more sources

On the X-ray Outbursts of Transient Anomalous X-ray Pulsars and Soft Gamma-ray Repeaters [PDF]

, 2012
We show that the X-ray outburst light curves of four transient anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs), namely XTE J1810-197, SGR 0501+4516, SGR 1627-41 and CXOU J164710.2-455216, can be produced by the fallback disk model that
Alpar, Alpar, Aptekar, Barthelmy, Camilo, Chatterjee, Corbel, de Jong, Ekşi, Enoto, Ertan, Ertan, Ertan, Ertan, Ertan, Ertan, Ertan, Gotthelf, Ibrahim, Israel, Kouveliotou, Krimm, Kumar, Mereghetti, Nakagawa, Palmer, Shakura, Tam, Woods, Ünal Ertan, Şirin Çalışkan   +30 more
core   +2 more sources

First XMM-Newton Observations of the Globular Cluster M22 [PDF]

, 2001
We have examined preliminary data of the globular cluster, M22, from the EPIC MOS detectors on board XMM-Newton. We have detected 27 X-ray sources within the centre of the field of view, 24 of which are new detections. Three sources were found within the
Asai, Asai, B. Gendre, Bahcall, Briel, Campana, D'Amico, D. Barret, Di Stefano, Djorgovski, Djorgovski, Fox, Grindlay, Grindlay, Harris, Hasinger, Hertz, Hertz, Johnston, Johnston, Kulkarni, Lightman, N. A. Webb, Narayan, Peterson, Piotto, Ramsay, Richman, Ritter, Thorsett, Turner, van der Klis, Verbunt, Verbunt, Verbunt, Verbunt, Verbunt, Zwart   +37 more
core   +2 more sources

Novae as a Class of Transient X‐Ray Sources [PDF]

The Astrophysical Journal, 2008
Motivated by the recently discovered class of faint (10^34-10^35 ergs/s) X-ray transients in the Galactic Center region, we investigate the 2-10 keV properties of classical and recurrent novae. Existing data are consistent with the idea that all classical novae are transient X-ray sources with durations of months to years and peak luminosities in the ...
Koji Mukai, Marina Orio, Massimo Della Valle, Reba M. Bandyopadhyay, Stefanie Wachter, Dawn Gelino, Christopher R. Gelino   +6 more
openaire   +3 more sources

X-Ray-luminous Supernovae: Threats to Terrestrial Biospheres

The Astrophysical Journal, 2023
The spectacular outbursts of energy associated with supernovae (SNe) have long motivated research into their potentially hazardous effects on Earth and analogous environments.
Ian R. Brunton, Connor O’Mahoney, Brian D. Fields, Adrian L. Melott, Brian C. Thomas   +4 more
doaj   +1 more source

Identification of the optical and quiescent counterparts to the bright X-ray transient in NGC 6440 [PDF]

, 2001
After 3 years of quiescence, the globular cluster NGC 6440 exhibited a bright transient X-ray source turning on in August 2001, as noted with the RXTE All-Sky Monitor.
Asai K., D. Pooley, F. Verbunt, Guainazzi M., J. J. M. in ’t Zand, M. H. van Kerkwijk, Mitsuda K., Ortolani S., R. Wijnands, Verbunt F., W. H. G. Lewin, Zavlin V. E., ’t Zand J. J. M.   +12 more
core   +3 more sources

The RS Oph Outburst of 2021 Monitored in X-Rays with NICER

The Astrophysical Journal, 2023
The 2021 outburst of the symbiotic recurrent nova RS Oph was monitored with the Neutron Star Interior Composition Explorer Mission (NICER) in the 0.2–12 keV range from day one after the optical maximum, until day 88, producing an unprecedented, detailed ...
Marina Orio, Keith Gendreau, Morgan Giese, Gerardo Juan M. Luna, Jozef Magdolen, Tod E. Strohmayer, Andy E. Zhang, Diego Altamirano, Andrej Dobrotka, Teruaki Enoto, Elizabeth C. Ferrara, Richard Ignace, Sebastian Heinz, Craig Markwardt, Joy S. Nichols, Michael L. Parker, Dheeraj R. Pasham, Songpeng Pei, Pragati Pradhan, Ron Remillard, James F. Steiner, Francesco Tombesi   +21 more
doaj   +1 more source

SPICES II. Optical and Near-Infrared Identifications of Faint X-Ray Sources from Deep Chandra Observations of Lynx [PDF]

, 2002
We present our first results on field X-ray sources detected in a deep, 184.7 ks observation with the ACIS-I camera on Chandra. The observations target the Lynx field of SPICES, and contains three known X-ray-emitting clusters out to z=1.27.
Chaffee, Frederic H., Connolly, Andrew, Dawson, Steve, Dey, Arjun, Eisenhardt, Peter, Elston, Richard, Holden, Brad, Rosati, Piero, Spinrad, Hyron, Stanford, S. A., Stern, Daniel, Tozzi, Paolo, Wu, K. L.   +12 more
core   +2 more sources

Optical and near-infrared observations of the GRB 970616 error box [PDF]

, 1999
We report on near-infrared and optical observations of the GRB 970616 error box and of the X-ray sources discovered by ASCA and ROSAT in the region. No optical transient was found either within the IPN band or in the X-ray error boxes, similarly to other
Castro-Tirado, A. J., Gorosabel, J., Greiner, J., Guerrero, M., Lund, N., Oscoz, A., Pedersen, H., Sabalisck, N., Thompson, D., Villaver, E.   +9 more
core   +2 more sources