430 citations · 3.1k across the 94 of their papers we have counts for
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A giant radio galaxy with three cycles of episodic jet activity from LoTSS DR2
Kshitij Chavan, Pratik Dabhade, D. J. Saikia
The excellent sensitivity and optimum resolution of LoTSS DR2 at 144 MHz has enabled us to discover a giant radio galaxy (J1225+4011) with three distinct episodes of jet activity,…
Evidence for low power radio jet-ISM interaction at 10 parsec in the dwarf AGN host NGC 4395
Payel Nandi, C. S. Stalin, D. J. Saikia +10
Black hole driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation. Such feedback processes, rem…
Star formation in the dwarf Seyfert galaxy NGC 4395: Evidence for both AGN and SNe feedback?
Payel Nandi, C. S. Stalin, D. J. Saikia +5
We present a detailed multi-wavelength study of star formation in the dwarf galaxy NGC 4395 which hosts an active galactic nucleus (AGN). From our observations with the Ultra-Viole…
LeMMINGs. VI. Connecting nuclear activity to bulge properties of active and inactive galaxies: radio scaling relations and galaxy environment
B. T. Dullo, J. H. Knapen, R. J. Beswick +13
Multiwavelength studies indicate that nuclear activity and bulge properties are closely related, but the details remain unclear. To study this further, we combine $Hubble~Space~Tel…
Decoding the giant extragalactic radio sources
Pratik Dabhade, D. J. Saikia, Mousumi Mahato
Giant radio sources (GRSs) defined to be > 0.7 Mpc are the largest single objects in the Universe and can be associated with both galaxies (GRGs) and quasars (GRQs). They are impor…
Jets in radio galaxies and quasars: an observational perspective
D. J. Saikia
This article gives a brief historical introduction and reviews our current understanding of jets in radio galaxies and quasars from an observational perspective, with an emphasis o…
LeMMINGs. III. The e-MERLIN Legacy Survey of the Palomar sample. Exploring the origin of nuclear radio emission in active and inactive galaxies through the [O III] -- radio connection
R. D. Baldi, D. R. A. Williams, R. J. Beswick +31
What determines the nuclear radio emission in local galaxies? We combine optical [O III] line emission, robust black hole (BH) mass estimates, and high-resolution e-MERLIN 1.5-GHz…
Compact steep-spectrum and peaked-spectrum radio sources
Christopher P. O'Dea, D. J. Saikia
Compact steep-spectrum (CSS) and peaked spectrum (PS) radio sources are compact, powerful radio sources. The multi-frequency observational properties and current theories are revie…
H I absorption towards radio Active Galactic Nuclei of different accretion modes
Yogesh Chandola, D. J. Saikia, Di Li
We present results of H I absorption experiment done using the Giant Metrewave Radio Telescope (GMRT) towards 27 low- and intermediate-luminosity ( 10…
CHANG-ES XX. High Resolution Radio Continuum Images of Edge-on Galaxies and their AGNs -- Data Release 3
Judith Irwin, Theresa Wiegert, Alison Merritt +17
The CHANG-ES galaxy sample consists of 35 nearby edge-on galaxies that have been observed using the VLA at 1.6 GHz and 6.0 GHz. Here we present the 3rd data release of our sample,…
A low-frequency study of recently identified double-double radio galaxies
S. Nandi, D. J. Saikia, R. Roy +6
In order to understand the possible mechanisms of recurrent jet activity in radio galaxies and quasars, which are still unclear, we have identified such sources with a large range…
CHANG-ES XI: Circular Polarization in the Cores of Nearby Galaxies
Judith A Irwin, Richard N. Henriksen, Marek Wezgowiec +18
We detect 5 galaxies in the CHANG-ES (Continuum Halos in Nearby Galaxies -- an EVLA Survey) sample that show circular polarization (CP) at L-band in our high resolution data sets.…
LeMMINGs. I. The eMERLIN legacy survey of nearby galaxies. 1.5-GHz parsec-scale radio structures and cores
R. D. Baldi, D. R. A. Williams, I. M. McHardy +29
We present the first data release of high-resolution ( arcsec) 1.5-GHz radio images of 103 nearby galaxies from the Palomar sample, observed with the eMERLIN array, as par…
HI, star formation and tidal dwarf candidate in the Arp 305 system
C. Sengupta, T. C. Scott, S. Paudel +3
We present results from our Giant Metrewave Radio Telescope (GMRT) HI observations of the Arp 305 system. The system consists of two interacting spiral galaxies NGC 4016 and NGC 40…
Tale of J1328+2752: a misaligned double-double radio galaxy hosted by a binary black-hole?
S. Nandi, M. Jamrozy, R. Roy +4
We present a radio and optical study of the double-double radio galaxy J1328+2752 based on new low-frequency GMRT observations and SDSS data. The radio data were used to investigat…
HI absorption towards low luminosity radio-loud AGNs of different accretion modes and WISE colours
Yogesh Chandola, D. J. Saikia
H{\sc i} absorption studies of active galaxies enable us to probe their circumnuclear regions and the general interstellar medium, and study the supply of gas which may trigger the…
Arp 65 interaction debris: massive HI displacement and star formation
Chandreyee Sengupta, Thomas. C. Scott, Sanjaya Paudel +3
Context: Pre-merger interactions between galaxies can induce significant changes in the morphologies and kinematics of the stellar and ISM components. Large amounts of gas and star…
HI in the Arp 202 system and its tidal dwarf candidate
Chandreyee Sengupta, T. C. Scott, K. S. Dwarakanath +2
We present results from our Giant Metrewave Radio Telescope (GMRT) HI observations of the interacting pair Arp 202 (NGC 2719 and NGC 2719A). Earlier deep UV(GALEX) observations of…
Associated H{\sc i} absorption towards the core of the radio galaxy 3C 321
Yogesh Chandola, S. K. Sirothia, D. J. Saikia +1
We report the results of Giant Metrewave Radio Telescope (GMRT) observations of H{\sc i} absorption towards the FRII radio galaxy 3C321 (J1531+2404), which is associated with an ac…
Continuum Halos in Nearby Galaxies -- an EVLA Survey (CHANG-ES) -- II: First Results on NGC 4631
Judith Irwin, Rainer Beck, R. A. Benjamin +19
We present the first results from the CHANG-ES survey, a new survey of 35 edge-on galaxies to search for both in-disk as well as extra-planar radio continuum emission. The motivati…