Zobrazeno 1 - 10
of 305
pro vyhledávání: '"Dewangan, G."'
Autor:
Sahu, Pragati, Chand, Swadesh, Thakur, Parijat, Dewangan, G. C., Agrawal, V. K., Tripathi, Prakash, Das, Subhashish
We perform a comprehensive timing and broadband spectral analysis using an AstroSat observation of the low-mass black hole X-ray binary H~1743--322 during 2017 outburst. Additionally, we use two Swift/XRT observations, one of which is simultaneous wi
Externí odkaz:
http://arxiv.org/abs/2409.10253
Autor:
Kumar, Shrabani, Dewangan, G. C., Gandhi, P., Papadakis, I. E., Mithun, N. P. S., Singh, K. P., Bhattacharya, D., Zdziarski, A. A., Stewart, G. C., Bhattacharyya, S., Chandra, S.
We present a multi-wavelength spectral study of NGC 4151 based on five epochs of simultaneous AstroSat observations in the near ultra-violet (NUV) to hard X-ray band ($\sim 0.005-80$ keV) during $2017 - 2018$. We derived the intrinsic accretion disk
Externí odkaz:
http://arxiv.org/abs/2409.04762
Autor:
Nicholl, M., Pasham, D. R., Mummery, A., Guolo, M., Gendreau, K., Dewangan, G. C., Ferrara, E. C., Remillard, R., Bonnerot, C., Chakraborty, J., Hajela, A., Dhillon, V. S., Gillan, A. F., Greenwood, J., Huber, M. E., Janiuk, A., Salvesen, G., van Velzen, S., Aamer, A., Alexander, K. D., Angus, C. R., Arzoumanian, Z., Auchettl, K., Berger, E., de Boer, T., Cendes, Y., Chambers, K. C., Chen, T. -W., Chornock, R., Fulton, M. D., Gao, H., Gillanders, J. H., Gomez, S., Gompertz, B. P., Fabian, A. C., Herman, J., Ingram, A., Kara, E., Laskar, T., Lawrence, A., Lin, C. -C., Lowe, T. B., Magnier, E. A., Margutti, R., McGee, S. L., Minguez, P., Moore, T., Nathan, E., Oates, S. R., Patra, K. C., Ramsden, P., Ravi, V., Ridley, E. J., Sheng, X., Smartt, S. J., Smith, K. W., Srivastav, S., Stein, R., Stevance, H. F., Turner, S. G. D., Wainscoat, R. J., Weston, J., Wevers, T., Young, D. R.
Quasi-periodic Eruptions (QPEs) are luminous bursts of soft X-rays from the nuclei of galaxies, repeating on timescales of hours to weeks. The mechanism behind these rare systems is uncertain, but most theories involve accretion disks around supermas
Externí odkaz:
http://arxiv.org/abs/2409.02181
Publikováno v:
A&A 686, A241 (2024)
We carry out deep near-ultraviolet (NUV) and far-ultraviolet (FUV) imaging of an interacting galaxy system, comprised of a Seyfert type 1 galaxy NGC 7469 and its companion IC 5283. Our aim is to resolve and map the star-forming regions in the outer a
Externí odkaz:
http://arxiv.org/abs/2404.12527
We study the connection between the variations in the far ultra-violet (FUV), near ultra-violet (NUV) and X-ray band emission from NGC 4051 using 4-days long AstroSat observations performed during 5-9 June 2016. NGC 4051 showed rapid variability in a
Externí odkaz:
http://arxiv.org/abs/2311.02722
Autor:
Pradeep, Kala G., Singh, Kulinder Pal, Dewangan, G. C., Aydi, Elias, Barrett, P. E., Buckley, D. A. H., Girish, V., Page, K. L., Potter, S. B., Schlegel, E. M.
We present multi-wavelength temporal and spectral characteristics of a magnetic cataclysmic variable (MCV) Swift J0503.7-2819, using far ultraviolet (FUV) and X-ray data from AstroSat, supplemented with optical data from the Southern African Large Te
Externí odkaz:
http://arxiv.org/abs/2310.07293
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
Autor:
Kumar, Shrabani, Dewangan, G. C., Singh, K. P., Gandhi, P., Papadakis, I. E., Tripathi, P., Mallick, L.
$\require{mediawiki-texvc}$ We study accretion disk emission from eight Seyfert $1 - 1.5$ active galactic nuclei (AGN) using far ultra-violet ($1300-1800$ ${\AA}$) slit-less grating spectra acquired with AstroSat/UVIT. We correct for the Galactic and
Externí odkaz:
http://arxiv.org/abs/2303.11882
Autor:
Kumari, Kavita, Dewangan, G. C., Papadakis, I. E., Beard, Max W. J., McHardy, I. M., Singh, K. P., Bhattacharya, D., Bhattacharyya, S., Chandra, S.
We study accretion disk-corona connection in Seyfert 1 galaxies using simultaneous UV/X-ray observations of NGC 4593 (July 14-18, 2016) and NGC 7469 (October 15-19, 2017) performed with AstroSat. We use the X-ray (0.5-7.0 keV) data acquired with the
Externí odkaz:
http://arxiv.org/abs/2303.01556
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