Zobrazeno 1 - 10
of 4 149
pro vyhledávání: '"Chandra, C."'
Autor:
Narang, Mayank, Puravankara, Manoj, Vedantham, H. K., Chandra, C. H. Ishwara, De, Ayanabha, Tyagi, Himanshu, Banerjee, Bihan, Nayak, Prasanta K., Surya, Arun, Shridharan, B., Pathak, Vinod C., Tripathi, Mihir
Coherent radio emission with properties similar to planetary auroral signals has been reported from GJ 1151, a quiescent, slow-rotating mid-M star, by the LOFAR Two-metre (120-170 MHz) Sky Survey (LoTSS). The observed {LOFAR} emission is fairly brigh
Externí odkaz:
http://arxiv.org/abs/2409.18507
Autor:
De Becker, Michael, del Palacio, Santiago, Benaglia, Paula, Tej, Anandmayee, Marcote, Benito, Romero, Gustavo Esteban, Bosch-Ramon, Valenti, Ishwara-Chandra, C. H.
Publikováno v:
Bulletin de la Soci\'et\'e Royale des Sciences de Li\`ege, 2024, Volume 93, No 2, 536-543
Galactic cosmic rays (GCRs) constitute a significant part of the energy budget of our Galaxy, and the study of their accelerators is of high importance in modern astrophysics. Their main sources are likely supernova remnants (SNRs). These objects are
Externí odkaz:
http://arxiv.org/abs/2406.14195
Hub-filament systems (HFSs) being the potential sites of formation of star clusters and high mass stars, provide a test bed for the current theories that attempt to explain star formation globally. It is thus important to study a large number of HFSs
Externí odkaz:
http://arxiv.org/abs/2404.07640
Publikováno v:
2023
We measure the specific star formation rates of \textit{K}-band selected galaxies from the ELAIS-N1 by stacking GMRT data at 610 MHz. We identify a sample of SFGs, spanning $\rm{0.1\leq\,\textit{z}\,\leq\,1.5}$ and $\rm{10^{8.5}<\,{\textit{M}_{\star}
Externí odkaz:
http://arxiv.org/abs/2307.04152
Autor:
An, Fangxia, Vaccari, M., Best, P. N., Ocran, E. F., Ishwara-Chandra, C. H., Taylor, A. R., Leslie, S. K., Röttgering, H. J. A., Kondapally, R., Haskell, Paul, Collier, J. D., Bonato, M.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 528, Issue 3, March 2024, Pages 5346-5363
By combining high-sensitivity LOFAR 150MHz, uGMRT 400MHz and 1,250MHz, GMRT 610MHz, and VLA 5GHz data in the ELAIS-N1 field, we study the radio spectral properties of radio-detected star-forming galaxies (SFGs) at observer-frame frequencies of 150-5,
Externí odkaz:
http://arxiv.org/abs/2303.06941
Autor:
Rao, Vaishnav V., Kharb, Preeti, K., Rubinur, S., Silpa, Roy, Namrata, Sebastian, Biny, Singh, Veeresh, Baghel, Janhavi, Manna, Souvik, Ishwara-Chandra, C. H.
The Seyfert galaxy NGC 2639 was known to exhibit three episodes of AGN jet/lobe activity. We present here the upgraded Giant Metrewave Radio Telescope (uGMRT) 735 MHz image of NGC 2639 showing a fourth episode as witnessed by the discovery of $\sim9$
Externí odkaz:
http://arxiv.org/abs/2301.01610
Autor:
Dutta, Sushant, Singh, Veeresh, Chandra, C. H. Ishwara, Wadadekar, Yogesh, Kayal, Abhijit, Heywood, Ian
The remnant phase of a radio galaxy is characterized by the cessation of AGN activity resulting in the stoppage of jets supplying plasma to radio lobes. In this paper, we present the search and characterization of remnant candidates in 12.5 deg$^{2}$
Externí odkaz:
http://arxiv.org/abs/2212.10133
Autor:
Dabhade, Pratik, Shimwell, Timothy W., Bagchi, Joydeep, Saikia, D. J., Combes, Francoise, Gaikwad, Madhuri, Rottgering, Huub, Mohapatra, Abhisek, Ishwara-Chandra, C. H., Intema, Huib T, Raychaudhury, Somak
Publikováno v:
A&A 668, A64 (2022)
We present for the first time a study of peculiar giant radio galaxy (GRG) J223301+131502 using deep multi-frequency radio observations from GMRT (323, 612, and 1300 MHz) and LOFAR (144 MHz) along with optical spectroscopic observations with the WHT~
Externí odkaz:
http://arxiv.org/abs/2209.13059
Publikováno v:
MNRAS 518, L83 (2023)
We observed the core region of the giant radio galaxy GRS J0844+4627 with e-MERLIN at 1.52 and 5.07 GHz. These observations revealed that the apparent single feature at the centre of GRS J0844+4627, as seen by GMRT, consists of two components separat
Externí odkaz:
http://arxiv.org/abs/2209.01428
Publikováno v:
Journal of Astrophysics and Astronomy, 43, Article number: 96 (2022)
The cessation of AGN activity in radio galaxies leads to a remnant phase during which jets are no longer sustained, but lobes can be detected for a period of time before they fade away due to radiative and dynamical energy losses. The time-scale of t
Externí odkaz:
http://arxiv.org/abs/2207.07871