Zobrazeno 1 - 10
of 40
pro vyhledávání: '"V K Dhar"'
Autor:
S. Godambe, N. Mankuzhiyil, C. Borwankar, B. Ghosal, A. Tolamatti, M. Pal, P. Chandra, M. Khurana, P. Pandey, Z. A. Dar, S. Godiyal, J. Hariharan, Keshav Anand, S. Norlha, D. Sarkar, R. Thubstan, K. Venugopal, A. Pathania, S. Kotwal, Raj Kumar, N. Bhatt, K. Chanchalani, M. Das, K. K. Singh, K. K. Gour, M. Kothari, Nandan Kumar, Naveen Kumar, P. Marandi, C. P. Kushwaha, M. K. Koul, P. Dorjey, N. Dorji, V. R. Chitnis, R. C. Rannot, S. Bhattacharyya, N. Chouhan, V. K. Dhar, M. Sharma, K. K. Yadav
Publikováno v:
The Astrophysical Journal Letters, Vol 974, Iss 2, p L31 (2024)
The radio galaxy NGC 1275, located at the central region of Perseus cluster, is a well-known very high-energy (VHE) gamma-ray emitter. The Major Atmospheric Cherenkov Experiment Telescope has detected two distinct episodes of VHE ( E > 80 GeV) gamma-
Externí odkaz:
https://doaj.org/article/9eadcb0b38f74939ac291decc9113256
Autor:
B Ghosal, A Tolamatti, S Bhattacharyya, N Bhatt, K K Yadav, P Chandra, M P Das, A K Tickoo, R C Rannot, K K Gaur, A Goyal, N Kumar, P Marandi, N K Agarwal, M Kothari, D Sarkar, M Sharma, N Chouhan, C Borwankar, V K Dhar, M K Koul, K Venugopal, S V Kotwal, S Godiyal, S Godambe, N Mankuzhiyil
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 517:5473-5482
1ES 1959+650, a high-energy peaked BL Lac object (HBL) with redshift z = 0.047, is known to exhibit flux and spectral variability in different energy bands. In this work, we primarily considered the simultaneous Fermi-LAT and Swift-XRT data of 1ES 19
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6165f3cf6fb24953619bcfea2cd41e0b
https://doi.org/10.1093/mnras/stac2950
https://doi.org/10.1093/mnras/stac2950
Publikováno v:
Journal of Astrophysics and Astronomy. 43
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ecec808ae7122bedfa827f6b97970e15
https://doi.org/10.1007/s12036-022-09799-7
https://doi.org/10.1007/s12036-022-09799-7
Publikováno v:
Experimental Astronomy. 48:297-311
In this paper, we discuss an artificial intelligence based approach to constrain the redshift of blazars using combined $\gamma$--ray observations from the \emph{Fermi} Large Area Telescope (LAT) and ground based atmospheric Cherenkov telescopes (ACT
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b120320bff3a6f56b6d6f86aeeb2071
https://doi.org/10.1007/s10686-019-09647-7
https://doi.org/10.1007/s10686-019-09647-7
Autor:
K. K. Yadav, N. Chouhan, R. Thubstan, S. Norlha, J. Hariharan, C. Borwankar, P. Chandra, V. K. Dhar, N. Mankuzhyil, S. Godambe, M. Sharma, K. Venugopal, K. K. Singh, N. Bhatt, S. Bhattacharyya, K. Chanchalani, M. P. Das, B. Ghosal, S. Godiyal, M. Khurana, S. V. Kotwal, M. K. Koul, N. Kumar, C. P. Kushwaha, K. Nand, A. Pathania, S. Sahayanathan, D. Sarkar, A. Tolamati, R. Koul, R. C. Rannot, A. K. Tickoo, V. R. Chitnis, A. Behere, S. Padmini, A. Manna, S. Joy, P. M. Nair, K. P. Jha, S. Moitra, S. Neema, S. Srivastava, M. Punna, S. Mohanan, S. S. Sikder, A. Jain, S. Banerjee, Krati ., J. Deshpande, V. Sanadhya, G. Andrew, M. B. Patil, V. K. Goyal, N. Gupta, H. Balakrishna, A. Agrawal, S. P. Srivastava, K. N. Karn, P. I. Hadgali, S. Bhatt, V. K. Mishra, P. K. Biswas, R. K Gupta, A. Kumar, S. G. Thul, R. Kalmady, D. D. Sonvane, V. Kumar, U. K. Gaur, J. Chattopadhyay, S. K. Gupta, A. R. Kiran, Y. Parulekar, M. K. Agrawal, R. M. Parmar, G. R. Reddy, Y. S. Mayya, C. K. Pithawa
Publikováno v:
Current Science. 123:1428
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::604b2ee562960dcdf2257322b3ee8d85
https://doi.org/10.18520/cs/v123/i12/1428-1435
https://doi.org/10.18520/cs/v123/i12/1428-1435
We explore the potential of an artificial neural network (ANN) based method intelligence to probe the propagation of cosmic $\gamma$-ray photons in the extragalactic Universe. The journey of $\gamma$-rays emitted from a distant source like blazar to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29ca94f294ebed6c73288fe4409f63b1
http://arxiv.org/abs/2109.07235
http://arxiv.org/abs/2109.07235
Autor:
S. K. Rao, P. Chandra, V. A. Nikam, S. K. Duhan, P. Verma, P. Dorjey, S. S. Upadhya, K. K. Yadav, N. K. Parmar, Abhradeep Roy, N. Chouhan, K. Venugopal, V. R. Chitnis, N. Dorji, M. Ranjan, V. K. Dhar, B. K. Nagesh, A. P. K. Kutty, Reena Deshmukh, Atrideb Chatterjee, S. R. Patel, M. N. Saraf, K. S. Gothe, B. B. Singh, Arkadipta Sarkar
Publikováno v:
Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021).
In last few years, SiPMs have emerged as a viable alternative to PMTs used in the imaging atmospheric Cherenkov telescopes. In addition to their higher photon detection efficiency, SiPMs provide attractive features like possible increase in observati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bbb6c0d05d8e3611627883f671cffbd2
https://doi.org/10.22323/1.395.0719
https://doi.org/10.22323/1.395.0719
Autor:
K. K. Yadav, P. Marandi, M. K. Koul, M. Kothari, Naveen Kumar, K. K. Singh, A. K. Tickoo, N. Chouhan, P. Chandra, R. C. Rannot, B. Ghosal, V. K. Dhar, K. Venugopal, C. Borwankar, H. C. Goyal, S. R. Kaul, K. Chanchalani, N. K. Agarwal, C.K. Bhat, K.K. Gaur, A. Goyal, R. Koul
Publikováno v:
New Astronomy. 67:67-75
We observed the TeV blazar Mrk421 in the very high energy (VHE) region with TACTIC from 21 December, 2014 to 21 February, 2015. The VHE γ-ray signal is detected from the source at a statistical significance of ∼ 9σ with 648 ± 74 γ-ray like even
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::11bea05acabc197eb30e43313f07c4cf
https://doi.org/10.1016/j.newast.2018.09.009
https://doi.org/10.1016/j.newast.2018.09.009
Autor:
A. Agarwal, B. Ghosal, H. C. Goyal, A. K. Tickoo, V. K. Dhar, Naveen Kumar, R. C. Rannot, S. R. Kaul, Alok C. Gupta, K. Chanchalani, K. K. Singh, K. K. Yadav, P. Chandra, H. Bhatt, P. Marandi, M. K. Koul, K. Venugopal, C. Borwankar, M. Kothari, C.K. Bhat, K.K. Gaur, N. Chouhan, R. Koul, N. K. Agarwal, A. Goyal
Publikováno v:
New Astronomy. 60:42-47
Non-blazar active galactic nuclei like radio galaxies have emerged as a new class of γ-ray sources in the sky. Observations of very high energy (VHE) γ-rays from radio galaxies with misaligned jets offer a unique tool to understand the physical pro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac6875edf95b9474cec0210a1f3d76d4
https://doi.org/10.1016/j.newast.2017.10.004
https://doi.org/10.1016/j.newast.2017.10.004
Autor:
P. Chandra, A. Goyal, N. K. Agarwal, K. Chanchalani, C.K. Bhat, A. K. Tickoo, K.K. Gaur, Sunder Sahayanathan, V. K. Dhar, R. C. Rannot, B. Ghosal, Alok C. Gupta, H. C. Goyal, M. K. Koul, S. R. Kaul, P. Marandi, K. Venugopal, K. K. Singh, C. Borwankar, Naveen Kumar, H. Bhatt, K. K. Yadav, M. Kothari, R. Koul, Jai Bhagwan, N. Chouhan
Publikováno v:
New Astronomy. 54:42-51
We have observed Markarian 501 in Very High Energy (VHE) gamma-ray wavelength band for 70.6 hours from 15 April to 30 May, 2012 using TACTIC telescope. Detailed analysis of $\sim$66.3 hours of clean data revealed the presence of a TeV $\gamma$-ray si
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21f811004eef6c2f6dcc0a2f063b0216
https://doi.org/10.1016/j.newast.2017.01.004
https://doi.org/10.1016/j.newast.2017.01.004