Publications (23)
SDSO1 is a Shocked Ghost Planetary Nebula in Front of M 31
Patrick Ogle, Mark Petersen, R. Michael Rich +12
We present new, deep narrowband imagery and discuss the nature of SDSO 1, the large [O III]-emitting nebula centered 1.5 degrees SE of M 31. We find strong evidence to support the…
A detailed study of the polarisation convention of the Giant Metrewave Radio Telescope
Poonam Chandra, S. Suresh Kumar, Sanjay Kudale +5
Our work aims to investigate the polarisation convention of the Giant Metrewave Radio Telescope (GMRT) radio telescope and understand whether the telescope follows the standard IAU…
High-resolution VLA low radio frequency observations of the Perseus cluster: radio lobes, mini-halo and bent-jet radio galaxies
Marie-Lou Gendron-Marsolais, Julie Hlavacek-Larrondo, Reinout J. van Weeren +11
We present the first high-resolution 230-470 MHz map of the Perseus cluster obtained with the Karl G. Jansky Very Large Array. The high dynamic range and resolution achieved has al…
Radio Spectral Energy Distribution of Low- Metal Poor Extreme Starburst Galaxies: Novel insights on the escape of ionizing photons
Omkar Bait, Daniel Schaerer, Yuri I. Izotov +1
Recent optical surveys have identified a rare population of low- () extreme star-forming galaxies (xSFGs) characterized by very low metallicity, strong emiss…
Radio continuum emission from local analogs of high-z faint LAEs: Blueberry galaxies
Biny Sebastian, Omkar Bait
We present a radio continuum study of a population of extremely young and starburst galaxies, termed as blueberries at 1 GHz using the upgraded Giant Metrewave Radio Teles…
A Curved 150 Parsec Long Jet in the Double-Peaked Emission-Line AGN KISSR 434
Preeti Kharb, Sravani Vaddi, Biny Sebastian +3
Double-peaked emission lines in the narrow- and/or broad-line spectra of AGN have been suggested to arise due to disky broad/narrow line regions, jet-medium interaction, or the pre…
Discovery of a new, 2.2 Mpc Giant Radio Galaxy at a redshift of 0.57
Biny Sebastian, C. H. Ishwara-Chandra, Ravi Joshi +1
We report the discovery of one of the largest and most distant Giant Radio Galaxy (GRG) in the Lynx field which was discovered using deep Giant Metre-wave Radio Telescope (GMRT) 15…
Low-redshift Lyman Continuum Survey: Radio continuum properties of low- Lyman continuum emitters
Omkar Bait, Sanchayeeta Borthakur, Daniel Schaerer +20
Sources that leak Lyman-continuum (LyC) photons and lead to the reionisation of the universe are intensely studied using multiple observing facilities. Recently, the Low-redshift L…
New Black Hole Spin Values for Sagittarius A* Obtained with the Outflow Method
Ruth A. Daly, Megan Donahue, Christopher P. O'Dea +3
Six archival Chandra observations are matched with eight sets of radio data and studied in the context of the outflow method to measure and study the spin properties of $\rm{Sgr ~A…
The contribution of non-central radio galaxies to AGN feedback in rich galaxy clusters
Ruchika Seth, Ewan O'Sullivan, Biny Sebastian +3
We present a combined radio/X-ray study of six massive galaxy clusters, aimed at determining the potential for heating of the intra-cluster medium (ICM) by non-central radio galaxi…
A Radio Polarimetric Study to Disentangle AGN Activity and Star-Formation in Seyfert Galaxies
Biny Sebastian, P. Kharb, C. P. O' Dea +2
To understand the origin of radio emission in radio-quiet AGN and differentiate between the contributions from star formation, AGN accretion, and jets, we have observed a nearby sa…
HI Imaging of a Blueberry Galaxy Suggests a Merger Origin
Saili Dutta, Apurba Bera, Omkar Bait +3
Blueberry galaxies (BBs) are fainter, less massive, and lower redshift counterparts of the Green pea galaxies. They are thought to be the nearest analogues of the high redshift Lym…
The filamentary radio lobes of the Seyfert-Starburst composite galaxy NGC3079
Biny Sebastian, Preeti Kharb, C. P. O Dea +2
We present results from multi-frequency polarization-sensitive Very Large Array observations of the Seyfert-starburst composite galaxy NGC3079. Our sensitive radio observations rev…
GMRT Low-frequency Imaging of an Extended Sample of X-shaped Radio Galaxies
Dharam V. Lal, Biny Sebastian, C. C. Cheung +1
We present a low-frequency imaging study of an extended sample of X-shaped radio sources using the Giant Metrewave radio telescope (GMRT) at two frequencies (610 and 240 MHz). The…
Understanding the Origin of Radio Outflows in Seyfert Galaxies using Radio Polarimetry
Biny Sebastian, P. Kharb, C. P. O' Dea +3
The role of starburst winds versus active galactic nuclei (AGN) jets/winds in the formation of the kiloparsec scale radio emission seen in Seyferts is not yet well understood. In o…
AGN Feedback Through Multiple Jet Cycles in the Seyfert Galaxy NGC 2639
Vaishnav V. Rao, Preeti Kharb, Rubinur K. +7
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…
Investigating the origin of X-ray jets: A case study of four hybrid morphology MOJAVE blazars
Biny Sebastian, Preeti Kharb, Matthew L. Lister +3
We have carried out Chandra, HST, and VLA observations of four MOJAVE blazars that have been previously classified as 'hybrid' (FR I/II) blazars in terms of radio morphology but no…
A VLBA-uGMRT search for candidate binary black holes: Study of six X-shaped radio galaxies with double-peaked emission lines
Biny Sebastian, Anderson Caproni, Preeti Kharb +6
Identifying methods to discover dual AGN has proven to be challenging. Several indirect tracers have been explored in the literature, including X/S-shaped radio morphologies and do…
The Discovery of Secondary Lobes in the Seyfert Galaxy NGC 2639
Biny Sebastian, P. Kharb, C. P. O`Dea +2
We report the discovery of a secondary pair of radio lobes in the Seyfert galaxy NGC 2639 with polarization-sensitive observations with the Karl G. Jansky Very Large Array (VLA). T…
What drives kpc-scale outflows in Radio-Quiet AGN? Insights from a Polarimetric Study
Salmoli Ghosh, Preeti Kharb, Biny Sebastian +5
We present a review of our findings on the origin, drivers, nature, and impact of kiloparsec-scale radio emission in radio-quiet (RQ) AGN. Using radio polarimetric techniques, we p…
Jet-mode feedback in NGC 5972: insights from resolved MUSE, GMRT and VLA observations
Arshi Ali, Biny Sebastian, Darshan Kakkad +10
NGC 5972, a Voorwerp galaxy, features a helical-shaped extended emission-line region (EELR) with a radius > 10 kpc and a S-shaped radio structure spanning about 470 kpc. We use VLT…
Giant Metrewave Radio Telescope Observations of Head-Tail Radio Galaxies
Biny Sebastian, Dharam V. Lal, A. Pramesh Rao
We present results from a study of seven large known head-tail radio galaxies based on observations using the Giant Metrewave Radio Telescope at 240 and 610 MHz. These observations…
A detailed study of X-ray cavities in the intracluster environment of the cool core cluster Abell 3017
M. B. Pandge, Biny Sebastian, Ruchika Seth +1
We present a detailed analysis of a cool-core galaxy cluster Abell 3017, at a redshift of z=0.219, which has been identified to be merging with its companion cluster Abell 3016. Th…