Results 91 to 100 of about 225,473 (202)

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

open access: yesThe 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   +2 more
doaj   +1 more source

Crispant analysis in zebrafish as a tool for rapid functional screening of disease-causing genes for bone fragility

open access: yeseLife
Heritable fragile bone disorders (FBDs), ranging from multifactorial to rare monogenic conditions, are characterized by an elevated fracture risk. Validating causative genes and understanding their mechanisms remain challenging.
Sophie Debaenst   +9 more
doaj   +1 more source

Czech Contribution to LOFT

open access: yesActa Polytechnica, 2013
We describe the current status of the Czech contribution to the ESA LOFT space mission, with emphasis on technical aspects. Expertise available in the Czech Republic will play a positive role in the LOFT project and related developments.
René Hudec   +2 more
doaj  

Quasars, pulsars, black holes and HEAO's [PDF]

open access: yes
Astronomical surveys are discussed by large X-ray, gamma ray, and cosmic ray instruments carried onboard high-energy astronomy observatories.
Doolitte, R. F.   +2 more
core   +1 more source

X-Ray Polarized View of the Accretion Geometry in the X-Ray Binary Circinus X-1

open access: yesThe Astrophysical Journal Letters
Cir X-1 is a neutron star X-ray binary characterized by strong variations in flux during its eccentric ∼16.6 day orbit. There are also strong variations in the spectral state, and it has historically shown both atoll and Z state properties.
John Rankin   +103 more
doaj   +1 more source

The CCD instrument background of the SMILE SXI

open access: yesEarth and Planetary Physics
The ESA and CAS SMILE mission orbit is highly elliptical and will pass through multiple radiation environments. The Soft X-ray Imager (SXI) instrument aboard has a radiation shutter door designed to close when the surrounding radiation flux is high.
M. W. J. Hubbard   +8 more
doaj   +1 more source

Multiwavelength Study of HESS J0632+057: New Insights into Pulsar–Disk Interaction

open access: yesThe Astrophysical Journal
We present an analysis of new multiwavelength observations of the TeV gamma-ray binary HESS J0632+057, conducted using SALT, Swift, NuSTAR, and VERITAS in 2023–2024.
Jaegeun Park   +61 more
doaj   +1 more source

The Medium Energy X-ray telescope (ME) onboard the Insight-HXMT astronomy satellite [PDF]

open access: green, 2020
Xue-Lei Cao   +40 more
openalex   +1 more source

AB Dor: Coronal Imaging and Activity Cycles

open access: yesThe Astrophysical Journal
Using long-term X-ray observations, we present short-term and long-term X-ray variability analysis of the ultrafast rotating active star AB Dor. Flaring events are common in X-ray observations of AB Dor and occupy a substantial portion of the total ...
Gurpreet Singh, J. C. Pandey
doaj   +1 more source

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