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40 papers · 2 filters
A Polarimetric Study of 9 PG Quasars with the VLA
Janhavi Baghel, P. Kharb, Silpa S. +2
We present polarization images of 9 radio-loud (RL) quasars from the VLA B-array at 6 GHz. These quasars belong to the Palomar-Green (PG) "blazar" sample comprising 16 RL quasars a…
Atomic Gas Scaling Relations of Star-forming Galaxies at
Aditya Chowdhury, Nissim Kanekar, Jayaram Chengalur
We use the Giant Metrewave Radio Telescope (GMRT) Cold-HI AT (CAT) survey, a 510 hr HI 21cm emission survey of galaxies at , to report the first measur…
Ultraviolet imaging observations of three jellyfish galaxies: Star formation suppression in the centre and ongoing star formation in stripped tails
Koshy George, B. M. Poggianti, Neven Tomičić +13
Spiral galaxies undergo strong ram-pressure effects when they fall into the galaxy cluster potential. As a consequence, their gas is stripped to form extended tails within which st…
Stellar Escape from Globular Clusters. I. Escape Mechanisms and Properties at Ejection
Newlin C. Weatherford, Fulya Kıroğlu, Giacomo Fragione +3
The theory of stellar escape from globular clusters (GCs) dates back nearly a century, especially the gradual evaporation of GCs via two-body relaxation coupled with external tides…
The HI mass function of star-forming galaxies at
Apurba Bera, Nissim Kanekar, Jayaram N. Chengalur +1
The neutral atomic hydrogen (HI) mass function (HIMF) describes the distribution of the HI content of galaxies at any epoch; its evolution provides an important probe of models of…
Emission line star catalogues post-Gaia DR3: A validation of Gaia DR3 data using LAMOST OBA emission catalogue
B. Shridharan, Blesson Mathew, Suman Bhattacharyya +9
Gaia DR3 and further releases have the potential to identify and categorise new emission-line stars in the Galaxy. We perform a comprehensive validation of astrophysical parameters…
Extension of HOPS Out to 500 ParSecs (eHOPS). I. Identification and Modeling of Protostars in the Aquila Molecular Clouds
Riwaj Pokhrel, S. Thomas Megeath, Robert A. Gutermuth +14
We present a Spitzer/Herschel focused survey of the Aquila molecular clouds (~pc) as part of the eHOPS (extension of HOPS Out to 500 ParSecs) census of nearby protostar…
The need for obscured supermassive black hole growth to explain quasar proximity zones in the epoch of reionization
Sindhu Satyavolu, Girish Kulkarni, Laura C. Keating +1
Proximity zones of high-redshift quasars are unique probes of supermassive black hole formation, but simultaneously explaining proximity zone sizes and black hole masses has proved…
Fragmented atomic shell around S187 HII region and its interaction with molecular and ionized gas
Petr Zemlyanukha, Igor I. Zinchenko, Evgeny Dombek +6
The environment of S187, a nearby H II region (1.40.3 kpc), is analyzed. A surrounding shell has been studied in the H I line, molecular lines, and also in infrared and radio…
Atomic Gas Dominates the Baryonic Mass of Star-forming Galaxies at
Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur
We present a comparison between the average atomic gas mass, (including HI and He), the average molecular gas mass, , and the aver…
Investigating star-formation activity towards the southern HII region RCW 42
Vipin Kumar, S. Vig, V. S. Veena +4
The star-forming activity in the HII region RCW 42 is investigated using multiple wavebands, from near-infrared to radio wavelengths. Located at a distance of 5.8 kpc, this souther…
High-resolution, High-sensitivity, Low-frequency uGMRT View of Coma Cluster of Galaxies
D. V. Lal, N. Lyskova, C. Zhang +12
We present high-resolution, high-sensitivity upgraded Giant Metrewave Radio Telescope observations of the Coma cluster (A1656) at 250-500 MHz and 550-850 MHz. At 250-500 MHz, 135 s…
Revealing the dust grain polarization properties as a function of extinction and distance towards NGC 1893
N. Bijas, Chakali Eswaraiah, Jia-Wei Wang +5
Dust polarization observations at optical wavelengths help to understand the dust grain properties and trace the plane-of-the-sky component of the magnetic field. In this study, we…
The Giant Metrewave Radio Telescope Cold-HI AT Survey
Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur
We describe the design, data analysis, and basic results of the Giant Metrewave Radio Telescope Cold-HI AT (GMRT-CAT1) survey, a 510-hour upgraded GMRT HI 21 cm emis…
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…
Jansky Very Large Array detections of CO(1-0) emission in HI-absorption-selected galaxies at
Balpreet Kaur, Nissim Kanekar, Marc Rafelski +3
We report a Karl G. Jansky Very Large Array search for redshifted CO(1-0) emission from three HI-absorption-selected galaxies at , identified earlier in their CO(3-2)…
A Massive, Dusty HI-Absorption-Selected Galaxy at Identified in a CO Emission Survey
Balpreet Kaur, Nissim Kanekar, Mitchell Revalski +4
We report a NOrthern Extended Millimeter Array (NOEMA) and Atacama Large Millimeter/submillimeter Array (ALMA) search for redshifted CO emission from the galaxies associated with s…
A Green Pea starburst arising from a galaxy-galaxy merger
S. Purkayastha, N. Kanekar, J. N. Chengalur +3
Green Pea galaxies are low-redshift starburst dwarf galaxies, with properties similar to those of the high-redshift galaxies that reionized the Universe. We report the first mappin…
Stellar populations of the globular cluster NGC 5053 investigated using AstroSat-Ultra Violet Imaging Telescope
K. J. Nikitha, S. Vig, S. K. Ghosh
Globular clusters being old and densely packed serve as ideal laboratories to test stellar evolution theories. Although there is enormous literature on globular clusters in optical…
A recent update of gas-phase chemical reactions and molecular lines in CLOUDY: its effects on millimeter and sub-millimeter molecular line predictions
Gargi Shaw, G. J. Ferland, M. Chatzikos
Here we present our current updates of the gas-phase chemical reaction rates and molecular lines in the spectral synthesis code CLOUDY, and its implications in spectroscopic modell…
A multiwavelength study of the W33 Main ultracompact HII region
Sarwar Khan, Jagadheep D. Pandian, Dharam V. Lal +7
The dynamics of ionized gas around the W33 Main ultracompact HII region is studied using observations of hydrogen radio recombination lines and a detailed multiwavelength character…
Host galaxy magnitude of OJ 287 from its colours at minimum light
Mauri J. Valtonen, Lankeswar Dey, S. Zola +54
OJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines the host galaxy by an order of magnitude. The only exception to this may be at minimum ligh…
Detecting PAHs in high-z galaxies in proxy: Modelling physical conditions in an extremely strong damped Lyman-alpha absorber towards QSO SDSS J1143+1420 at z=2.323
Gargi Shaw, A. Ranjan
We explore indirect methods to detect Polycyclic Aromatic Hydrocarbons (PAHs) in gas-rich, absorption-selected galaxies at high redshift. We look at the optical VLT/X-shooter obser…
Insufficient Gas Accretion Caused the Decline in Cosmic Star-Formation Activity 8 Billion Years Ago
Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur
Measurements of the atomic hydrogen (HI) properties of high-redshift galaxies are critical to understanding the decline in the star-formation rate (SFR) density of the Universe aft…