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pro vyhledávání: '"Raychaudhuri, B."'
We present the results from the spectral and timing analysis of the accreting neutron star 1A~1744-361 from the \nustar{} observation performed in its 2022 outbursts. The unabsorbed bolometric X-ray luminosity during this observation in the energy ba
Externí odkaz:
http://arxiv.org/abs/2309.12637
We report on the \nustar{} observation of the newly discovered neutron star X-ray binary Swift~J1858.6-0814 taken on 23rd March 2019. The light curve of the source exhibits several large flares during some time intervals of this observation. The sour
Externí odkaz:
http://arxiv.org/abs/2306.00545
We report on the nearly simultaneous \nicer{} and \nustar{} observations of the known X-ray transient XTE~J1739-285. These observations provide the first sensitive hard X-ray spectrum of this neutron star X-ray transient. The source was observed on 2
Externí odkaz:
http://arxiv.org/abs/2203.16198
We present a broadband spectral analysis of the atoll source 4U~1636-536 observed for $\sim92$ ks with \nustar{}. The source was found to be in a low-luminosity state during this observation with $3-79 \kev{}$ X-ray luminosity of $L_{3-79 keV}=(1.03\
Externí odkaz:
http://arxiv.org/abs/2009.13924
We present \nustar{} observation of the atoll type neutron star (NS) low-mass X-ray binary (LMXB) Serpens~X-1 (Ser~X-1) performed on 17 February 2018. We observed Ser~X-1 in a soft X-ray spectral state with 3-79 keV luminosity of $L_\text{X}\sim0.4\t
Externí odkaz:
http://arxiv.org/abs/1907.08625
We report on the \nustar{} observation of the atoll type neutron star (NS) low-mass X-ray binary GX~3+1 performed on 17 October 2017. The source was found in a soft X-ray spectral state with $3-70$keV luminosity of $L_\text{X}\sim3\times 10^{37}$ erg
Externí odkaz:
http://arxiv.org/abs/1902.02190
Akademický článek
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Approximately 10-20% of Active Galactic Nuclei are known to eject powerful jets from the innermost regions. There is very little observational evidence if the jets are powered by spinning black holes and if the accretion disks extend to the innermost
Externí odkaz:
http://arxiv.org/abs/1511.04976
Einstein introduced Cosmological Constant in his field equations in an ad hoc manner. Cosmological constant plays the role of vacuum energy of the universe which is responsible for the accelerating expansion of the universe. To give theoretical suppo
Externí odkaz:
http://arxiv.org/abs/1302.2716
Publikováno v:
Int.J.Mod.Phys.A24:719-739,2009
Several physical natures of charged brane-world black holes have been investigated. At first, time-like and null geodesics of the charged brane-world black holes are presented. We also analyze all the possible motions by plotting the effective potent
Externí odkaz:
http://arxiv.org/abs/0809.2474