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45 papers · 2 filters
A VLA-GMRT Look at 11 Powerful FR II Quasars
S. Vaddi, P. Kharb, R. A. Daly +5
We present results from 1.4 and 5 GHz observations at matched resolution with the Karl G. Jansky Very Large Array (VLA) of 11 powerful 3C FR II quasars. We examine the 11 quasars a…
[CII] 158 Micron Emission from z~4 HI Absorption-Selected Galaxies
Marcel Neeleman, Nissim Kanekar, J. Xavier Prochaska +2
We report on a search for the [CII] 158 micron emission line from galaxies associated with four high-metallicity damped Ly-alpha absorbers (DLAs) at z ~ 4 using the Atacama Large M…
Polarimetric and photometric investigation of a dark globule LDN 1225: distance, extinction law, and magnetic fields
Chakali Eswaraiah, Shih-Ping Lai, Yuehui Ma +7
We present the results based on the optical -band polarization observations of 280 stars distributed towards the dark globule LDN\,1225. {\it Gaia} data release 2 parallaxes alo…
A SOFIA Survey of [CII] in the galaxy M51 I. [CII] as a tracer of Star Formation
Jorge L. Pineda, Christian Fischer, Maria Kapala +12
We present a [CII] 158um map of the entire M51 (including M51b) grand--design spiral galaxy observed with the FIFI-LS instrument on SOFIA. We compare the [CII] emission with the to…
Outlying H blobs in SDSS IV MaNGA
Omkar Bait, Yogesh Wadadekar, Sudhanshu Barway
We have discovered a population of 29 outlying H emitters which appear like unresolved blobs in the DR14 data release of the SDSS IV MaNGA integral field unit survey. They do no…
AGN Feedback in galaxy groups: a detailed study of X-ray features and diffuse radio emission in IC1262
M. B. Pandge, S. S. Sonkamble, Viral Parekh +4
This paper reports a systematic search of X-ray cavities, density jumps and shocks in the inter-galactic environment of the galaxy group IC~1262 using {\it Chandra}, GMRT and VLA a…
Non-thermal emission from massive star forming regions: A possible SNR candidate G351.7-1.2?
V. S. Veena, S. Vig, B. Sebastian +3
We present low frequency wide band observations (300-500 MHz) of the star forming complex G351.7-1.2 using upgraded Giant Metrewave Radio Telescope (uGMRT), India. Combining this w…
A Dearth of Atomic Hydrogen in NGC1052-DF2
Aditya Chowdhury
The recently claimed discovery of an ultra-diffuse galaxy lacking dark matter has important implications for alternate theories to dark matter as well as models of galaxy formation…
The Murchison Widefield Array Transients Survey (MWATS). A search for low frequency variability in a bright Southern hemisphere sample
M. E. Bell, Tara Murphy, P. J. Hancock +38
We report on a search for low-frequency radio variability in 944 bright (> 4Jy at 154 MHz) unresolved, extragalactic radio sources monitored monthly for several years with the Murc…
Investigating inner and large scale physical environments of IRAS 17008-4040 and IRAS 17009-4042 toward l = 345.5 deg, b = 0.3 deg
Lokesh K. Dewangan, Tapas Baug, Devendra K. Ojha +1
We present a multi-wavelength observational study of IRAS 17008-4040 and IRAS 17009-4042 to probe the star-formation (SF) mechanisms operational in both the sites. Each IRAS site i…
The hierarchical assembly of galaxies and black holes in the first billion years: predictions for the era of gravitational wave astronomy
Pratika Dayal, Elena M. Rossi, Banafsheh Shiralilou +3
In this work we include black hole (BH) seeding, growth and feedback into our semi-analytic galaxy formation model, Delphi. Our model now fully tracks the, accretion- and merger-dr…
Probing the fluctuating Ultra-violet background using the Hubble Frontier Fields
Tirthankar Roy Choudhury, Pratika Dayal
In recent years, the rise in the number of Lyman Break Galaxies detected at high redshifts z >= 6 has opened up the possibility of understanding early galaxy formation physics in g…
Star Cluster Formation from Turbulent Clumps. II. Gradual Star Cluster Formation
Juan P. Farias, Jonathan C. Tan, Sourav Chatterjee
We investigate the dynamical evolution of star clusters during their formation, assuming that they are born from a turbulent starless clump of a given mass that is embedded within…
The study of a system of H II regions toward l = 24.8 deg, b = 0.1 deg at the Galactic bar - Norma arm interface
L. K. Dewangan, J. S. Dhanya, D. K. Ojha +1
To probe the star formation (SF) process, we present a thorough multi-wavelength investigation of several H II regions located toward l = 24.8 deg, b = 0.1 deg. A system of at leas…
Multicomponent H2 in DLA at zabs = 2.05: physical conditions through observations and numerical models
Katherine Rawlins, Raghunathan Srianand, Gargi Shaw +3
We perform detailed spectroscopic analysis and numerical modelling of an H2-bearing damped Lyman-alpha absorber (DLA) at zabs = 2.05 towards the quasar FBQS J2340-0053. Metal absor…
A study of spectral curvature in the radio relic in Abell 4038 using the uGMRT
Ruta Kale, Viral Parekh, K. S. Dwarakanath
The remnant radio galaxies in galaxy clusters are important sources of seed relativistic electron population in the intra-cluster medium (ICM). Their occurrence and spectral proper…
Probing star formation in galaxies at via a Giant Metrewave Radio Telescope stacking analysis
Apurba Bera, Nissim Kanekar, Benjamin J. Weiner +2
We have used the Giant Metrewave Radio Telescope (GMRT) to carry out deep 610 MHz continuum imaging of four sub-fields of the DEEP2 Galaxy Redshift Survey. We stacked the radio emi…
A Giant Metrewave Radio Telescope survey for associated HI 21-cm absorption in the Caltech-Jodrell Flat-spectrum sample
J. N. H. S. Aditya, Nissim Kanekar
We report a Giant Metrewave Radio Telescope (GMRT) survey for associated HI 21-cm absorption from 50 active galactic nuclei (AGNs), at , selected from the Ca…
How initial size governs core collapse in globular clusters
Kyle Kremer, Sourav Chatterjee, Claire S. Ye +2
Globular clusters (GCs) in the Milky Way exhibit a well-observed bimodal distribution in core radii separating the so-called "core-collapsed" and "non-core-collapsed" clusters. Her…
Filamentary Structures and Star Formation Activities in the Sites S234, V582, and IRAS 05231+3512
L. K. Dewangan, T. Baug, D. K. Ojha +2
To investigate the physical processes, we present observational results of the sites S234, V582, and IRAS 05231+3512 situated toward l = 171.7 - 174.1 degrees. Based on the CO line…
Mass modelling of a superthin galaxy, FGC1540
Sushma Kurapati, Arunima Banerjee, Jayaram N. Chengalur +4
We present high resolution H{\sc i} 21cm Giant Meterwave Radio Telescope (GMRT) observations of the superthin galaxy FGC1540 with a spatial resolution of 10 8 and…
Evolution of the AGN UV luminosity function from redshift 7.5
Girish Kulkarni, Gábor Worseck, Joseph F. Hennawi
Determinations of the UV luminosity function of AGN at high redshifts are important for constraining the AGN contribution to reionization and understanding the growth of supermassi…
Star formation and gas inflows in the OH Megamaser galaxy IRAS03056+2034
C. Hekatelyne, Rogemar A. Riffel, Dinalva Sales +6
We have obtained observations of the OH Megamaser galaxy IRAS03056+0234 using Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Very Large Array (VLA) and Hubble S…
Spatially resolved electron density in the Narrow Line Region of z<0.02 radio AGNs
D. Kakkad, B. Groves, M. Dopita +7
Although studying outflows in the host galaxies of AGN have become the forefront of extra-galactic astronomy in recent years, estimating the energy associated with these outflows h…