Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Goyal, H. C."'
Autor:
Singh, K K, Yadav, K K, Chanchalani, K, Chandra, P, Ghosal, B, Tickoo, A K, Rannot, R C, Marandi, P, Agarwal, N K, Kothari, M, Gour, K K, Goyal, H C, Goyal, A, Kumar, N, Borwankar, C, Kaul, S R, Dhar, V K, Koul, M K, Koul, R, Venugopal, K, Bhat, C K, Chouhan, N
In this work, we report on the detection of enhanced TeV gamma- ray emission from the high synchrotron-peaked blazar Mrk 421 with the TACTIC telescope on the night of December 28, 2014 (MJD 57019). We use data from the TACTIC observations of Mrk 421
Externí odkaz:
http://arxiv.org/abs/1808.02670
Autor:
Chandra, P, Singh, K K, Rannot, R C, Yadav, K K, Bhatt, H, Tickoo, A K, Ghosal, B, Kothari, M, Gaur, K K, Goyal, A, Goyal, H C, Kumar, N, Marandi, P, Chouhan, N, Sahayanathan, S, Chanchalani, K, Agarwal, N K, Dhar, V K, Kaul, S R, Koul, M K, Koul, R, Venugopal, K, Bhat, C K, Borwankar, C, Bhagwan, J, Gupta, A C
Publikováno v:
New Astronomy 54C (2017) pp. 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:
http://arxiv.org/abs/1701.04935
Autor:
Singh, K K, Sahayanathan, S, Sinha, A, Bhatt, N, Tickoo, A K, Yadav, K K, Rannot, R C, Chandra, P, Venugopal, K, Marandi, P, Kumar, N, Goyal, H C, Goyal, A, Agarwal, N K, Kothari, M, Chanchalani, K, Dhar, V K, Chouhan, N, Bhat, C K, Koul, M K, Koul, R
Publikováno v:
New Astronomy 54 (2017) 24-29
Strong X-ray and $\gamma$--ray flares have been detected in February 2010 from the high synchrotron peaked blazar Mrk 421 (z=0.031). With the motivation of understanding the physics involved in this flaring activity, we study the variability of the s
Externí odkaz:
http://arxiv.org/abs/1701.01557
Autor:
Singh, K. K., Yadav, K. K., Tickoo, A. K., Rannot, R. C., Chandra, P., Agarwal, N. K., Gaur, K. K., Goyal, A., Goyal, H. C., Kumar, N., Marandi, P., Kothari, M., Bhatt, H., Chanchalani, K., Chouhan, N., Dhar, V. K., Ghosal, B., Kaul, S. R., Koul, M. K., Koul, R., Venugopal, K., Bhat, C. K., Borwankar, C., Bhagwan, J., Gupta, A. C.
Publikováno v:
2015 New Astronomy 36, p 1-8
In this paper, we present results of TeV $\gamma$--ray observations of the high synchrotron peaked BL Lac object 1ES 1218+304 (z=0.182) with the $TACTIC$ (TeV Atmospheric Cherenkov Telescope with Imaging Camera). The observations are primarily motiva
Externí odkaz:
http://arxiv.org/abs/1410.2369
Autor:
Chandra, P., Rannot, R. C., Yadav, K. K., Tickoo, A. K., Singh, K. K., Chanchalani, K., Kothari, M., Agarwal, N. K., Goyal, A., Goyal, H. C., Kotwal, S., Kumar, N., Marandi, P., Venugopal, K., Bhat, C. K., Bhatt, N., Bhattacharya, S., Borwankar, C., Chouhan, N., Dhar, V. K., Kaul, S. R., Koul, S. K., Koul, M. K., Koul, R., Mitra, A. K., Sahayanathan, S., Sharma, M.
We have observed the blazar Markarian 421 with the TACTIC $\gamma$-ray telescope at Mt. Abu, India, from 22 November 2009 to 16 May 2010 for 265 hours. Detailed analysis of the data so recorded revealed presence of a TeV $\gamma$-ray signal with a st
Externí odkaz:
http://arxiv.org/abs/1202.2984
Autor:
Yadav, K. K., Rannot, R. C., Chandra, P., Tickoo, A. K., Thoudam, S., Venugopal, K., Bhatt, N., Bhattacharyya, S., Chanchalani, K., Dhar, V. K., Godambe, S. V., Goyal, H. C., Kothari, M., Kotwal, S., Koul, M. K., Koul, R., Sahaynathan, S., Sharma, M.
Publikováno v:
J.Phys.G36:085201,2009
The BL Lac object H1426+428 ($z\equiv 0.129$) is an established source of TeV $\gamma$-rays and detections of these photons from this object also have important implications for estimating the Extragalactic Background Light (EBL) in addition to the u
Externí odkaz:
http://arxiv.org/abs/0905.3994
Autor:
Godambe, S. V., Rannot, R. C., Chandra, P., Yadav, K. K., Tickoo, A. K., Venugopal, K., Bhatt, N., Bhattacharyya, S., Chanchalani, K., Dhar, V. K., Goyal, H. C., Kaul, R. K., Kothari, M., Kotwal, S., Koul, M. K., Koul, R., Sahaynathan, B. S., Sharma, M., Thoudam, S.
Publikováno v:
J.Phys.G35:065202,2008
In this paper we report on the Markarian 501 results obtained during our TeV $\gamma$-ray observations from March 11 to May 12, 2005 and February 28 to May 7, 2006 for 112.5 hours with the TACTIC $\gamma$-ray telescope. During 2005 observations for 4
Externí odkaz:
http://arxiv.org/abs/0804.1473
Autor:
Koul, R., Tickoo, A. K., Kaul, S. K., Kaul, S. R., Kumar, N., Yadav, K. K., Bhatt, N., Venugopal, K., Goyal, H. C., Kothari, M., Chandra, P., Rannot, R. C., Dhar, V. K., Koul, M. K., Kaul, R. K., Kotwal, S., Chanchalani, K., Thoudam, S., Chouhan, N., Sharma, M., Bhattacharyya, S., Sahayanathan, S.
Publikováno v:
Nucl.Instrum.Meth.A578:548-564,2007
The TACTIC $\gamma$-ray telescope, equipped with a light collector of area $\sim$9.5m$^2$ and a medium resolution imaging camera of 349-pixels, has been in operation at Mt.Abu, India since 2001. This paper describes the main features of its various s
Externí odkaz:
http://arxiv.org/abs/0706.2055
Autor:
Godambe, S. V., Rannot, R. C., Baliyan, K. S., Tickoo, A. K., Thoudam, S., Dhar, V. K., Chandra, P., Yadav, K. K., Venugopal, K., Bhatt, N., Bhattacharyya, S., Chanchalani, K., Ganesh, S., Goyal, H. C., Joshi, U. C., Kaul, R. K., Kothari, M., Kotwal, S., Koul, M. K., Koul, R., Sahaynathan, S., Shah, C., Sharma, M.
Publikováno v:
J.Phys.G34:1683-1696,2007
We have observed the BL Lac object 1ES2344+514 (z = 0.044) in Very High Energy (VHE) gamma-ray and near-infrared wavelength bands with TACTIC and MIRO telescopes respectively. The observations were made from 18th October to 9th December 2004 and 27th
Externí odkaz:
http://arxiv.org/abs/0704.3533
Autor:
Yadav, K. K., Chandra, P., Tickoo, A. K., Rannot, R. C., Godambe, S., Koul, M. K., Dhar, V. K., Thoudam, S., Bhatt, N., Bhattacharyya, S., Chanchalani, K., Goyal, H. C., Kaul, R. K., Kothari, M., Kotwal, S., Koul, R., Sahayanathan, S., Sharma, M., Venugopal, K.
Publikováno v:
Astropart.Phys.27:447-454,2007
The TACTIC $\gamma$-ray telescope has observed Mrk 421 on 66 clear nights from Dec. 07, 2005 to Apr. 30, 2006, totalling $\sim$ 202 hours of on-source observations. Here, we report the detection of flaring activity from the source at $\geq$ 1 TeV ene
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701890