Results 61 to 70 of about 9,171,233 (161)
Time Resolved Two Dimensional X-Ray Densitometry of a Two Phase Flow Downstream of a Ventilated Cavity [PDF]
, 2013 To measure the void fraction distribution in gas-liquid flows, a two-dimensional x-ray densitometry system was developed. This system is capable of acquiring a two-dimensional projection with a 225 cm2 area of measurement through 21 cm of water.
GABILLET, Céline +8 more
core +1 more source
A Study of Spectral Variability Between Flaring and Nonflaring State in M74 X-1
The Astrophysical JournalWe 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 +2 more
doaj +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 +4 more
wiley +1 more source
COMPACT OPTICAL COUNTERPARTS OF ULTRALUMINOUS X-RAY SOURCES [PDF]
The Astrophysical Journal, 2011 Using archival Hubble Space Telescope (HST) imaging data, we report the multiband photometric properties of 13 ultraluminous X-ray sources (ULXs) that have a unique compact optical counterpart. Both magnitude and color variation are detected at time scales of days to years.
Tao, Lian +3 more
openaire +2 more sources
The Ultraluminous X-Ray Sources Population of the Galaxy NGC 7456 [PDF]
The Astrophysical Journal, 2020 Abstract Ultraluminous X-ray sources (ULXs) are a class of accreting compact objects with X-ray luminosities above 1039 erg s−1. The ULX population counts several hundred objects but only a fraction are well studied. Here we present a detailed analysis of all ULXs hosted in the galaxy NGC 7456.
F. Pintore +30 more
openaire +9 more sources
Discovery of a 9.67 s Pulsar in an Ultraluminous X-Ray Source in NGC 4631 with XMM-Newton
The Astrophysical Journal LettersThanks to a recent observation with XMM-Newton, we discovered periodic pulsations at P = 9.6652 ± 0.0002 s in a new ultraluminous X-ray source (ULX) in the galaxy NGC 4631. This source, dubbed as X−8, shows one of the largest spin-up rates ever observed,
Lorenzo Ducci +6 more
doaj +1 more source
Magnetic Inclination Evolution of Accreting Neutron Stars in Intermediate/Low-mass X-Ray Binaries
The Astrophysical Journal, 2023 The magnetic inclination angle χ , namely the angle between the spin and magnetic axes of a neutron star, plays a vital role in its observational characteristics. However, there are few systematic investigations of its long-term evolution, especially for
Hao-ran Yang, Xiang-dong Li
doaj +1 more source
The Orbital Period of the Ultraluminous X-ray Source in M82 [PDF]
Science, 2006 The ultraluminous x-ray source (ULX) in the galaxy M82 has been identified as a possible intermediate-mass black hole formed in stellar collisions in the super star cluster MGG 11. The x-ray flux from M82 is modulated, with a peak-to-peak amplitude corresponding to an isotropic luminosity of 2.4 _ 1040 erg s‐1 in M82 and a period of 62.0 2.5 days ...
Kaaret, Philip +2 more
openaire +3 more sources
The Astrophysical JournalSupercritical 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
Compact radio emission in Ultraluminous X‐ray sources [PDF]
Astronomische Nachrichten, 2011 AbstractWe present results from our studies of radio emission from selected Ultraluminous X‐ray (ULX) sources, using archival Giant Metrewave Radio Telescope (GMRT) data and new European VLBI Network (EVN) observations. The GMRT data are used to find possible faint radio emission from ULX sources located in late‐type galaxies in the Chandra Deep Fields.
Mezcua, M., Lobanov, A. P.
openaire +2 more sources