Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Omar, Amitesh"'
Autor:
Pandey, Shivangi, Rakshit, Suvendu, Chand, Krishan, Stalin, C. S., Cho, Hojin, Woo, Jong-Hak, Jalan, Priyanka, Mandal, Amit Kumar, Omar, Amitesh, Jose, Jincen, Gupta, Archana
Understanding the origins of massive black hole seeds and their co-evolution with their host galaxy requires studying intermediate-mass black holes (IMBHs) and estimating their mass. However, measuring the mass of these IMBHs is challenging due to th
Externí odkaz:
http://arxiv.org/abs/2409.16844
The signal of dipole anisotropy in quasar number counts is studied using the CatWISE2020 catalog in various color bins. It is found that the dipole signal differs significantly in two color bins, namely, $1.1>W1-W2\ge 0.8$ and $1.4>W1-W2>1.1$. The co
Externí odkaz:
http://arxiv.org/abs/2405.16853
Autor:
Ghosh, Ankur, Misra, Kuntal, Vaishnava, C. S., Resmi, L., Arun, K. G., Omar, Amitesh, Dimple, Chakradhari, N. K.
The short Gamma Ray Bursts (GRBs) are the aftermath of the merger of binary compact objects (neutron star -- neutron star or neutron star -- black hole systems). With the simultaneous detection of Gravitational Wave (GW) signal from GW 170817 and GRB
Externí odkaz:
http://arxiv.org/abs/2401.11777
This project is focused on evaluating the slowly-varying ground layer seeing component at the optical telescopes of ARIES. To achieve this, we assembled the instrument, consisting of a filter wheel, a CCD camera, and a tip-tilt enabled transparent gl
Externí odkaz:
http://arxiv.org/abs/2401.10604
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
Radio emission from 23 tidal disruption event host galaxies were searched in the 144 MHz LOFAR-LoTSS2 images. Three host galaxies are detected with diffuse radio emission, which can be interpreted as either galactic synchrotron radio emission or diff
Externí odkaz:
http://arxiv.org/abs/2209.09643
Autor:
Ghosh, Ankur, Vaishnava, C. S., Resmi, L., Misra, Kuntal, Arun, K. G., Omar, Amitesh, Chakradhari, N. K.
Short gamma-ray bursts (GRBs) are the aftermath of compact binary mergers involving neutron stars. If the merger remnant is a millisecond magnetar instead of a black hole, a significant proportion of the rotational energy deposited to the emerging ej
Externí odkaz:
http://arxiv.org/abs/2207.10001
Autor:
Omar, Amitesh
The discovery of faint FR~I radio jets in the nearby elliptical galaxy NGC 5322 is reported here using 144 MHz LOFAR image. The jets have an angular extent of $\sim40$ arcmin or a projected physical extent of $\sim350$ kpc. The faint jets remain well
Externí odkaz:
http://arxiv.org/abs/2206.14734
Autor:
Omar, Amitesh
The Odd Radio Circles are newly identified diffuse radio sources at ~1 GHz frequency, with edge-brightened nearly circular morphology, which is remarkably similar to supernova remnants although a physical association with previous population of Galac
Externí odkaz:
http://arxiv.org/abs/2205.08092
Autor:
Gopal-Krishna, Joshi, Ravi, Patra, Dusmanta, Yang, Xiaolong, Ho, Luis C., Wiita, Paul J., Omar, Amitesh
We report observations of a bright dumb-bell system of galaxies ($z =0.162$) with the upgraded Giant Metrewave Radio Telescope ($u$GMRT), which show that each member of this gravitationally bound pair of galaxies hosts bipolar radio jets extended on
Externí odkaz:
http://arxiv.org/abs/2205.04483