Zobrazeno 1 - 10
of 604
pro vyhledávání: '"Bisht, P. S."'
Autor:
Raj, A., Bisht, M. S., Walter, F. M., Pandey, R., Woodward, C. E., Harker, D. E., Bisht, D., Singh, H. P., Agarwal, A., Pandey, J. C., Joshi, A., Belwal, K., Buil, Christian
V5579 Sgr was a fast nova discovered in 2008 April 18.784 UT. We present the optical spectroscopic observations of the nova observed from the Castanet Tolosan, SMARTS and CTIO observatories spanning over 2008 April 23 to 2015 May 11. The spectra are
Externí odkaz:
http://arxiv.org/abs/2408.01924
Autor:
Singh, Avinash, Teja, R. S., Moriya, T. J., Maeda, K., Kawabata, K. S., Tanaka, M., Imazawa, R., Nakaoka, T., Gangopadhyay, A., Yamanaka, M., Swain, V., Sahu, D. K., Anupama, G. C., Kumar, B., Anche, R. M., Sano, Y., Raj, A., Agnihotri, V. K., Bhalerao, V., Bisht, D., Bisht, M. S., Belwal, K., Chakrabarti, S. K., Fujii, M., Nagayama, T., Matsumoto, K., Hamada, T., Kawabata, M., Kumar, A., Kumar, R., Malkan, B. K., Smith, P., Sakagami, Y., Taguchi, K., Tominaga, N., Watanabe, A.
We present a detailed investigation of photometric, spectroscopic, and polarimetric observations of the Type II SN 2023ixf. Earlier studies have provided compelling evidence for a delayed shock breakout from a confined dense circumstellar matter (CSM
Externí odkaz:
http://arxiv.org/abs/2405.20989
Autor:
Yuan, Yifan, Kotiuga, Michele, Park, Tae Joon, Ni, Yuanyuan, Saha, Arnob, Zhou, Hua, Sadowski, Jerzy T., Al-Mahboob, Abdullah, Yu, Haoming, Du, Kai, Zhu, Minning, Deng, Sunbin, Bisht, Ravindra S., Lyu, Xiao, Wu, Chung-Tse Michael, Ye, Peide D., Sengupta, Abhronil, Cheong, Sang-Wook, Xu, Xiaoshan, Rabe, Karin M., Ramanathan, Shriram
Materials with field-tunable polarization are of broad interest to condensed matter sciences and solid-state device technologies. Here, using hydrogen (H) donor doping, we modify the room temperature metallic phase of a perovskite nickelate NdNiO3 in
Externí odkaz:
http://arxiv.org/abs/2311.12200
Autor:
Galloni, Alessandro R., Yuan, Yifan, Zhu, Minning, Yu, Haoming, Bisht, Ravindra S., Wu, Chung-Tse Michael, Grienberger, Christine, Ramanathan, Shriram, Milstein, Aaron D.
Design of hardware based on biological principles of neuronal computation and plasticity in the brain is a leading approach to realizing energy- and sample-efficient artificial intelligence and learning machines. An important factor in selection of t
Externí odkaz:
http://arxiv.org/abs/2310.00066
We examine the long-term stability (on decade-like time scales) of optical `high polarization' (HP) state with $p_{opt}$ $> 3\%$, which commonly occurs in flat-spectrum (i.e., beamed) radio quasars (FSRQs) and is a prominent marker of blazar state. U
Externí odkaz:
http://arxiv.org/abs/2301.06159
Intranight optical variability of low-mass Active Galactic Nuclei: A Pointer to blazar-like activity
Autor:
Gopal-Krishna, Chand, Krishan, Chand, Hum, Negi, Vibhore, Mishra, Sapna, Britzen, S., Bisht, P. S.
This study aims to characterise, for the first time, intranight optical variability (INOV) of low-mass active galactic nuclei (LMAGN) which host a black hole (BH) of mass $M_{BH} \sim 10^6 M_{\odot}$, i.e., even less massive than the Galactic centre
Externí odkaz:
http://arxiv.org/abs/2210.05186
Autor:
Tiwari, Vipin, Bisht, Nandan S.
Reducing the aperture size is a conventional technique to obtain enhanced image resolution in optics but it is obscured by depleting illumination. Polarization coded apertures (PCAs) can be employed to circumvent this critical artifact. We experiment
Externí odkaz:
http://arxiv.org/abs/2204.04005
We report the reconstruction of a transparency image in Ghost diffraction scheme using a statistical optics approach. This is implemented by using a static diffuser rather than a pseudo thermal light source with a rotating diffuser. The experimental
Externí odkaz:
http://arxiv.org/abs/2204.03860
Autor:
Chand, Krishan, Gopal-Krishna, Omar, Amitesh, Chand, Hum, Mishra, Sapna, Bisht, P. S., Britzen, S.
We report the first study to characterise intranight variability of the blazar class from the perspective of (rest-frame) UV emission. For this, we carried out intranight optical monitoring of 14 flat-spectrum radio quasars (FSRQs) located at high re
Externí odkaz:
http://arxiv.org/abs/2112.04516
Autor:
Sinha, Tirthendu, Sharma, Saurabh, Panwar, Neelam, Matsunaga, N., Ogura, K., Kobayashi, N., Yadav, R. K., Ghosh, A., Pandey, R., Bisht, P. S.
We present the results from our time-series imaging data taken with the 1.3m Devasthal fast optical telescope and 0.81m Tenagara telescope in $V$, $R_{c}$, $I_{c}$ bands covering an area of $\sim18^\prime.4\times 18^\prime.4$ towards the star-forming
Externí odkaz:
http://arxiv.org/abs/2108.02107