430 citations · 3.1k across the 94 of their papers we have counts for
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The Dynamics of Radio Galaxies and Double-Double Radio Galaxies
C. Konar, M. Jamrozy, M. J. Hardcastle +4
Relativistic and magnetised plasma ejected by radio loud AGNs through jets form the diffuse lobes of radio galaxies. The radiating particles (electron/electron-positron) in lobes e…
A 325-MHz GMRT survey of the Herschel-ATLAS/GAMA fields
T. Mauch, H. -R. Klöckner, S. Rawlings +5
We describe a 325-MHz survey, undertaken with the Giant Metrewave Radio Telescope (GMRT), which covers a large part of the three equatorial fields at 9, 12 and 14.5 h of right asce…
The 617 MHz - 850 m Correlation (Cosmic Rays and Cold Dust) in NGC 3044 and NGC 4157
Judith A. Irwin, Rupinder S. Brar, D. J. Saikia +1
We present the first maps of NGC 3044 and NGC 4157 at m and m from the JCMT as well as the first maps at 617 MHz from the GMRT. High latitude emission has been…
Radio polarimetry of compact steep spectrum sources at sub-arcsecond resolution
F. Mantovani, A. Rossetti, W. Junor +2
Aims - We report new Very Large Array polarimetric observations of Compact Steep-Spectrum (CSS) sources at 8.4, 15, and 23GHz. Methods - Using multi-frequency VLA observations we h…
CO(1-0) detection of molecular gas in the massive Spiderweb Galaxy (z=2)
B. H. C. Emonts, I. Feain, H. J. A. Roettgering +13
The high-redshift radio galaxy MRC 1138-262 (`Spiderweb Galaxy'; z = 2.16), is one of the most massive systems in the early Universe and surrounded by a dense `web' of proto-cluste…
A cluster pair : A3532 and A3530
K. Lakhchaura, K. P. Singh, D. J. Saikia +1
We present a detailed study of a close pair of clusters of galaxies, A3532 and A3530, and their environments. The \textit{Chandra} X-ray image of A3532 reveals presence of substruc…
Unusual displacement of HI due to tidal interaction in Arp 181
Chandreyee Sengupta, K. S. Dwarakanath, D. J. Saikia +1
We present results from GMRT HI 21 cm line observations of the interacting galaxy pair Arp 181 (NGC 3212 and NGC 3215) at z =0.032. We find almost all of the detected HI (90%) disp…
Associated 21-cm absorption towards the cores of radio galaxies
Yogesh Chandola, Neeraj Gupta, D. J. Saikia
We present the results of Giant Metrewave Radio Telescope (GMRT) observations to detect H{\sc i} in absorption towards the cores of a sample of radio galaxies. From observations of…
The Australia Telescope Large Area Survey: Spectroscopic Catalogue and Radio Luminosity Functions
Minnie Y. Mao, Rob Sharp, Ray P. Norris +9
The Australia Telescope Large Area Survey (ATLAS) has surveyed seven square degrees of sky around the Chandra Deep Field South (CDFS) and the European Large Area ISO Survey - South…
Double-double radio galaxies from the FIRST survey
S. Nandi, D. J. Saikia
The radio structures and optical identifications of a sample of 242 sources classified as double-double radio sources by Proctor (2011) from a morphological study of sources in the…
Continuum Halos in Nearby Galaxies -- an EVLA Survey (CHANG-ES) -- I: Introduction to the Survey
Judith Irwin, Rainer Beck, R. A. Benjamin +19
We introduce a new survey to map the radio continuum halos of a sample of 35 edge-on spiral galaxies at 1.5 GHz and 6 GHz in all polarization products. The survey is exploiting the…
A low-frequency study of two asymmetric large radio galaxies
A. Pirya, S. Nandi, D. J. Saikia +1
We present the results of multifrequency observations of two asymmetric, Mpc-scale radio sources with the Giant Metrewave Radio Telescope (GMRT) and the Very Large Array (VLA). The…
Search for cold gas in z>2 damped Lyman-alpha systems: 21-cm and H_2 absorption
R. Srianand, N. Gupta, P. Petitjean +4
(Abridged) We present the results of a systematic GBT and GMRT survey for 21-cm absorption in a sample of 10 DLAs at 2<z_abs<3.4. Analysis of L-band VLBA images of the background Q…
Intracluster medium of the merging cluster Abell 3395
K. Lakhchaura, K. P. Singh, D. J. Saikia +1
We present a detailed imaging and spectral analysis of the merging environment of the bimodal cluster A3395 using X-ray and radio observations. X-ray images of the cluster show fiv…
HI in Arp72 and similarities with M51-type systems
Chandreyee Sengupta, D. J. Saikia, K. S. Dwarakanath
We present neutral hydrogen (H{\sc i}) observations with the Giant Metrewave Radio Telescope ({\it GMRT}) of the interacting galaxies NGC5996 and NGC5994, which make up the Arp72 s…
HI absorption towards nearby compact radio sources
Yogesh Chandola, S. K. Sirothia, D. J. Saikia
We present the results of HI absorption measurements towards a sample of nearby Compact Steep-Spectrum (CSS) and Giga-Hertz Peaked Spectrum (GPS) radio sources, the CORALZ sample,…
Discovery of a spiral-host episodic radio-galaxy
Ananda Hota, S. K. Sirothia, Youichi Ohyama +6
We report the discovery of a unique radio galaxy at z=0.137, which could possibly be the second spiral-host large radio galaxy and also the second triple-double episodic radio gala…
The inverse-Compton ghost HDF 130 and the giant radio galaxy 6C 0905+3955: matching an analytic model for double radio source evolution
Philip Mocz, A. C. Fabian, Katherine M. Blundell +3
We present new GMRT observations of HDF 130, an inverse-Compton (IC) ghost of a giant radio source that is no longer being powered by jets. We compare the properties of HDF 130 wit…
EMU: Evolutionary Map of the Universe
Ray P. Norris, A. M. Hopkins, J. Afonso +54
EMU is a wide-field radio continuum survey planned for the new Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The primary goal of EMU is to make a deep (rms ~ 10 m…
Molecular CO(1-0) gas in the z~2 radio galaxy MRC 0152-209
B. H. C. Emonts, I. Feain, M. Y. Mao +12
We report the detection of molecular CO(1-0) gas in the high-z radio galaxy MRC 0152-209 (z = 1.92) with the Australia Telescope Compact Array Broadband Backend (ATCA/CABB). This i…
Episodic Activity in Active Galactic Nuclei
D. J. Saikia, M. Jamrozy, C. Konar +1
There is increasing evidence to suggest that AGN activity may be episodic, with a wide range of possible time scales. Radio galaxies exhibit the most striking examples of episodic…
A radio study of the double-double radio galaxy 3C293
S. A. Joshi, S. Nandi, D. J. Saikia +2
We present radio continuum observations at frequencies ranging from 150 to 5000 MHz of the misaligned double-double radio galaxy, DDRG, 3C293 (J1352+3126) using the Giant Met…
Wide-angle tail galaxies in ATLAS
Minnie Y. Mao, Rob Sharp, D. J. Saikia +4
We present radio images of a sample of six Wide-Angle Tail (WAT) radio sources identified in the ATLAS 1.4 GHz radio survey, and new spectroscopic redshifts for four of these sourc…
Radio Polarimetry of 3C119, 3C318, and 3C343 at milliarcsecond resolution
F. Mantovani, A. Rossetti, W. Junor +2
We report VLBA polarimetric observations of the CSS sources 3C119, 3C318, and 3C343 at 5 and 8.4 GHz. The CSS source 3C119 has source rest-frame RM values up to ~10200 rad/m**2 in…