Long-term Study of the First Galactic Ultraluminous X-Ray Source Swift J0243.6+6124 Using NICER

Autor: Birendra Chhotaray, Gaurava K. Jaisawal, Prantik Nandi, Sachindra Naik, Neeraj Kumari, Mason Ng, Keith C. Gendreau

Publikováno v: The Astrophysical Journal, Vol 963, Iss 2, p 132 (2024)

We present the results obtained from detailed X-ray timing and spectral studies of X-ray pulsar Swift J0243.6+6124 during its giant and normal X-ray outbursts between 2017 and 2023 observed by the Neutron star Interior Composition Explorer (NICER). W

Externí odkaz: https://doaj.org/article/c6b08266771745609328a8151834b8d5

Investigation of a small X-ray flaring event in NLS1 galaxy NGC 4051

Autor: Neeraj Kumari, Arghajit Jana, Sachindra Naik, Prantik Nandi

We performed a detailed broadband spectral and timing analysis of a small flaring event of ~120 ks in a narrow-line Seyfert 1 galaxy NGC 4051 using simultaneous XMM-Newton and NuSTAR observations. The ~300 ks long NuSTAR observation and the overlappi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e961f9aececce80fe379fcc8fcb7216
http://arxiv.org/abs/2303.11799

Swift and XMM-Newton observations of an RS CVn type eclipsing binary SZ Psc: Superflare and coronal properties

Autor: Subhajeet Karmakar, Sachindra Naik, Jeewan C Pandey, Igor S Savanov

We present an in-depth study of a large and long duration ($>$1.3 days) X-ray flare observed on an RS CVn type eclipsing binary system SZ Psc using observations from Swift observatory. In the 0.35$-$10 keV energy band, the peak luminosity is estimate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af90c63782079110d78cc14434936372
http://arxiv.org/abs/2210.07170

AstroSat observation of X-ray dips and state transition in the black hole candidate MAXI J1803–298

Autor: Arghajit Jana, Sachindra Naik, Gaurava K Jaisawal, Birendra Chhotaray, Neeraj Kumari, Shivangi Gupta

Publikováno v: Jana, A, Naik, S, Jaisawal, G K, Chhotaray, B, Kumari, N & Gupta, S 2022, ' AstroSat observation of X-ray dips and state transition in the black hole candidate MAXI J1803–298 ', Monthly Notices of the Royal Astronomical Society, vol. 511, no. 3, pp. 3922–3936 . https://doi.org/10.1093/mnras/stac315

We present the results obtained from broadband X-ray timing and spectral analysis of black hole candidate MAXI J1803-298 using an AstroSat observation on May 11-12, 2021. Four periodic absorption dips with a periodicity of $7.02 \pm 0.18$ hour are de

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0c37cd57e2f356a691e0d57dc8247b0
https://orbit.dtu.dk/en/publications/ae09e377-e65b-40d4-af02-1b6fccb775c0

Evidence of Heavy Obscuration in the Low-Luminosity AGN NGC 4941

Autor: Arghajit Jana, Sachindra Naik, Neeraj Kumari

We present the results obtained from timing and spectral studies of the highly obscured low luminosity active galactic nucleus NGC~4941 using data obtained from the {\it Nuclear Spectroscopic Telescope Array} and the {\it Neil Gehrels Swift} Observat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::abfaf9e5399d4e9ec78228254d59bb7c
http://arxiv.org/abs/2111.13508