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Browsing Aryabhatta Research Institute of Observational Sciences by Author "Omar, Amitesh"

Browsing Aryabhatta Research Institute of Observational Sciences by Author "Omar, Amitesh"

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  • Characterization of a deep-depletion 4K × 4K charge-coupled device detector system designed for ARIES Devasthal faint object spectrograph 
    Panchal, Dimple; Kumar, Tripurari S.; Omar, Amitesh; Misra, Kuntal (Journal of Astronomical Telescopes, Instruments, and Systems, 2023-02)
    We present the characterization of the charge-coupled device (CCD) system developed for the ARIES Devasthal faint object spectrograph (ADFOSC) instrument on the 3.6 m Devasthal optical telescope (DOT). We describe various ...
  • Detection possibilities of hostless intergalactic supernova remnants with Square Kilometre Array 
    Omar, Amitesh (Journal Astrophysical Astronomy, 2023-06)
    Possibilities to detect hostless supernova remnants (hl-SNR) in intergalactic medium using the 1 GHz band of the Square Kilometre Array (SKA) are discussed. The optical detection rate of the hl-SN constrained from the ...
  • LOFAR discovery of rare large FR I jets in the low-luminosity radio galaxy NGC 5322 
    Omar, Amitesh (Monthly Notices of the Royal Astronomical Society Letters, 2022-11)
    The discovery of faint Fanaroff–Riley type I (FR I) radio jets in the elliptical galaxy NGC 5322 is reported here using the 144-MHz image from Data Release 2 of the Low-Frequency Array (LOFAR) Two-metre Sky Survey (LoTSS). ...
  • LOFAR Search for Radio Emission from Galaxies Hosting Tidal Disruption Events 
    Kaushik, Kamakshi; Omar, Amitesh; Kumar, Brijesh; Mishra, Kuntal; Joshi, Jagdish (Research Notes of the AAS, 2022-09)
    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 ...
  • Modeling the late-time merger ejecta emission in short gamma ray bursts 
    Ghosh, Ankur; Misra, Kuntal, et.al.; Omar, Amitesh; Panchal, Dimple (Journal Astrophysical Astronomy, 2022-12)
    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 gravi tational wave (GW) signal ...
  • On energetics and progenitors of odd radio circles: a causal connection with tidal disruption of stars? 
    Omar, Amitesh (Monthly Notices of the Royal Astronomical Society Letters, 2022-10)
    Odd Radio Circles or ORCs are recently discovered edge-brightened, low surface brightness circular radio sources. The progenitors and astrophysical processes responsible for their origins are presently debated. Some ORCs ...
  • Search for merger ejecta emission from late-time radio observations of short GRBs using GMRT 
    Ghosh, Ankur; Vaishnava, C. S.; Resmi, L.; Misra, Kuntal; Arun, K. G.; Omar, Amitesh; Chakradhari, N. K. (Monthly Notices of the Royal Astronomical Society, 2024-01)
    In some cases, the merger of two neutron stars can produce a rapidly rotating and highly magnetized millisecond magnetar. A significant proportion of the rotational energy deposited to the emerging ejecta can produce a ...
  • The transience and persistence of high optical polarisation state in beamed radio quasars 
    Chand, Krishan; Krishna, Gopal; Omar, Amitesh; Chand, Hum; Bisht, P. S. (Publications of the Astronomical Society of Australia, 2023-02)
    We examine the long-term stability (on decade-like timescales) of optical ‘high polarisation’ (HP) state with popt > 3%, which commonly occurs in flat-spectrum (i.e., beamed) radio quasars (FSRQs) and is a prominent marker ...
  • The twin radio galaxy TRG J104454+354055 
    Krishna, Gopal, et.al.; Omar, Amitesh (Monthly Notices of the Royal Astronomical Society Letters, 2022-07)
    We report observations of a bright dumb-bellsystem of galaxies(z = 0.162) with the upgraded Giant Metrewave Radio Telescope (uGMRT), which show that each member of this gravitationally bound pair of galaxies hosts bipolar ...
  • Yet Another Odd Radio Circle? 
    Omar, Amitesh (Research Notes of the AAS, 2022-05)
    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 ...

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