Results 11 to 20 of about 29,884 (299)

The light curve of a transient X-ray source [PDF]

The Astrophysical Journal, 1975
The Ariel-5 satellite has monitored the X-ray light curve of A1524-62 almost continuously from 40 days prior to maximum light until its disappearance below the effective experimental sensitivity. The source exhibited maximum light on Dec. 4, 1974, at a level of 0.9 the apparent magnitude of the Crab Nebula in the energy band 3-6 keV.
L. J. Kaluzienski, S. S. Holt, E. A. Boldt, P. J. Serlemitsos, G. Eadie, K. A. Pounds, M. J. Ricketts, M. Watson   +7 more
openaire   +4 more sources

Transient X-Ray Sources in the Magellanic-type Galaxy NGC 4449 [PDF]

The Astrophysical Journal, 2017
Abstract We report the identification of seven transient X-ray sources in the nearby Magellanic-type galaxy NGC 4449 using archival multi-epoch X-ray observations conducted with the Chandra, XMM-Newton, and Swift telescopes over the years 2001–2013. Among them, two sources are classified as supersoft X-ray sources (SSSs) because of their
V. Jithesh, Zhongxiang Wang
openaire   +4 more sources

Charge Carrier Screening in Photoexcited Epitaxial Semiconductor Nanorods Revealed by Transient X-ray Absorption Linear Dichroism [PDF]

, 2021
Understanding the electronic structure and dynamics of semiconducting nanomaterials at the atomic level is crucial for the realization and optimization of devices in solar energy, catalysis, and optoelectronic applications.
Renske, van der Veen, Tyler, Haddock, John, Burke, Gilles, Doumy, Anne Marie, March, Conner, Dykstra, Thomas, Rossi, Rachel, Wallick, Cecilia, Gentle   +8 more
core   +1 more source

Probing Competing Relaxation Pathways in Malonaldehyde with Transient X-Ray Absorption Spectroscopy [PDF]

, 2020
Excited-state intramolecular hydrogen transfer (ESIHT) is a fundamental reaction relevant to chemistry and biology. Malonaldehyde is the simplest example of ESIHT, yet only little is known experimentally about its excited-state dynamics.
Andreas, Dreuw, Patrick, Norman, Todd J., Martínez, Nanna Holmgaard, List, Adrian, L. Dempwolff   +4 more
core   +1 more source

The Luminosity Phase Space of Galactic and Extragalactic X-Ray Transients Out to Intermediate Redshifts

The Astrophysical Journal, 2023
We present a detailed compilation and analysis of the X-ray phase space of low- to intermediate-redshift (0 ≤ z ≤ 1) transients that consolidates observed light curves (and theory where necessary) for a large variety of classes of transient/variable ...
Ava Polzin, Raffaella Margutti, Deanne L. Coppejans, Katie Auchettl, Kim L. Page, Georgios Vasilopoulos, Joe S. Bright, Paolo Esposito, Peter K. G. Williams, Koji Mukai, Edo Berger   +10 more
doaj   +1 more source

Optical Constraints on an X‐ray Transient Source in M31 [PDF]

The Astrophysical Journal, 2005
15 pages, 3 figures, accepted for publication in ...
Williams, Benjamin F., Garcia, Michael R., Primini, Frank A., McClintock, Jeffrey E., Murray, Stephen S.   +4 more
openaire   +2 more sources

The nature of the X-ray transient MAXI J0556−332 [PDF]

, 2012
Phase-resolved spectroscopy of the newly discovered X-ray transient MAXIJ0556-332 has revealed the presence of narrow emission lines in the Bowen region that most likely arise on the surface of the mass donor star in this low-mass X-ray binary.
Charles, PA, Cornelisse, R., Steeghs, D., O'Brien, Kieran, Munoz-Darias, T, Israel, G., Israel, G, Charles, P. A., Steeghs, D, Casares, J, Torres, M. A. P., Muñoz-Darias, T., Casares, J., Stella, L, Campana, S, Torres, M.A.P., Torres, MAP, Campana, S., Charles, P.A., Stella, L., D'Avanzo, P, O'Brien, K, Cornelisse, R, Israel, G. L., O'Brien, K., D'Avanzo, P.   +25 more
core   +1 more source

Transient Attosecond Soft-X-Ray Spectroscopy in Layered Semi-Metals [PDF]

, 2020
X-ray absorption fine-structure (XAFS) spectroscopy is a well-established technique capable of extracting information about a material’s electronic and lattice structure with atomic resolution.
Di Palo, N., Wall, Simon, Leon, I., Sidiropolous, T. P.H., Biegert, Jens, Severino, S., Draxi, C., Pellegrin, E., Herrero Martin, J., Mañas-Valero, S., Yabana, K., Cousin, S. L., Reduzzi, M., Picon, A., Cocchi, C., Danz, T., Uemoto, M., Hemmer, M., Buades, B., Rivas, D. E., Coronado, E., Schultze, Martin   +21 more
core   +1 more source

A transient ultraluminous X-ray source in NGC 55 [PDF]

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT Ultraluminous X-ray sources (ULXs) are a class of accreting compact objects with X-ray luminosities above 1039 erg s−1 . The average number of ULXs per galaxy is still not well-constrained, especially given the uncertainty on the fraction of ULX transients.
Robba, A, Barra, F
openaire   +7 more sources

INTEGRAL observations of recurrent fast X-ray transient sources [PDF]

, 2005
Fast X-ray Transients (FXTs) are believed to be non-recurrent bright X-ray sources lasting less than a day and occurring at serendipitous positions, they can best detected and discovered by instruments having a sufficiently wide field of view and high ...
Hill, A.B., Dean, A.J., V. Sguera, Barlow, E.J., S. E. Shaw, D. R. Willis, A. J. Bird, Malizia, A., Clark, D.J., A. Malizia, Willis, D.R., Shaw, S.E., A. J. Dean, Bird, A.J., Sguera, V., A. B. Hill, Moran, L., D. J. Clark, A. Bazzano, P. Ubertini, L. Moran, Bazzano, A., Ubertini, P., E. J. Barlow   +23 more
core   +1 more source