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47 papers · 2 filters
Ultraviolet Imaging Telescope (UVIT) observation of the Galactic Globular Cluster NGC 7492
Ranjan Kumar, Ananta C. Pradhan, Abhisek Mohapatra +4
We present detailed photometric observations of the Galactic globular cluster NGC 7492 using the data obtained with two far-ultraviolet (FUV: 1300 - 1800 Å) and three near-ultravio…
Study of Galactic Structure Using UVIT/AstroSat Star Counts
Ranjan Kumar, Ananta C. Pradhan, Devendra K. Ojha +3
The structure of our Galaxy has been studied from ultraviolet (UV) star counts obtained with the Ultra-Violet Imaging Telescope (UVIT) on board the {\em AstroSat} satellite, in Far…
UVIT study of UV bright stars in the globular cluster NGC 4147
Ranjan Kumar, Ananta C. Pradhan, Mudumba Parthasarathy +4
We present far ultraviolet (FUV) observations of globular cluster NGC 4147 using three FUV filters, BaF2 (F154W), Sapphire (F169M), and Silica (F172M) of Ultra-Violet Imaging Teles…
A High-Resolution View of Fast Radio Burst Host Environments
Alexandra G. Mannings, Wen-fai Fong, Sunil Simha +11
We present Hubble Space Telescope (HST/WFC3) ultraviolet and infrared observations of eight fast radio burst (FRB) host galaxies with sub-arcsecond localizations, including the hos…
The Evolution of the Low-Frequency Radio AGN Population to in the ELAIS N1 Field
E. F. Ocran, A. R. Taylor, M. Vaccari +4
We study the cosmic evolution of radio sources out to using a GMRT 610 MHz survey covering 1.86 deg of the ELAIS N1 field with a minimum/median rms noise 7…
The Herschel Orion Protostar Survey: Far-Infrared Photometry and Colors of Protostars and Their Variations across Orion A and B
William J. Fischer, S. Thomas Megeath, E. Furlan +10
The degree to which the properties of protostars are affected by environment remains an open question. To investigate this, we look at the Orion A and B molecular clouds, home to m…
Cosmic ray dissociation of molecular hydrogen and dense cloud chemistry
Gargi Shaw, G. J. Ferland, S. Ploeckinger
Dissociation of molecular hydrogen by secondary electrons produced by cosmic ray or X-ray ionization plays a crucial role in the chemistry of the densest part of molecular clouds.…
A Multi-wavelength Study of the Dual Nuclei in Mrk 212
K. Rubinur, P. Kharb, M. Das +5
We present radio observations of the galaxy merger remnant Mrk 212 with the Karl G. Jansky Very Large Array (VLA) and the upgraded Giant Meter Radio Telescope (uGMRT). Mrk 212 has…
The mass assembly of high-redshift black holes
Olmo Piana, Pratika Dayal, Marta Volonteri +1
We use the Delphi semi-analytic model to study the mass assembly and properties of high-redshift () black holes over a wide mass range, . Our…
The host galaxy of OJ 287 revealed by optical and near-infrared imaging
K. Nilsson, J. Kotilainen, M. Valtonen +11
The BL Lacertae object OJ 287 (z = 0.306) has unique double-peaked optical outbursts every ~12 years, and it presents one of the best cases for a small-separation binary supermassi…
NGC7538 IRS1 -- an O star driving an ionized jet and giant N-S outflow
G. Sandell, M. Wright, R. Güsten +4
NGC 7538 IRS 1 is a very young embedded O star driving an ionized jet and accreting mass with an accretion rate > 10^-4 Msun/year, which is quenching the hypercompact HII region. W…
HI 21-centimetre emission from an ensemble of galaxies at an average redshift of one
Aditya Chowdhury, Nissim Kanekar, Jayaram Chengalur +2
The baryonic processes in galaxy evolution include gas infall onto galaxies to form neutral atomic hydrogen (HI), the conversion of HI to the molecular state (H), and, finally,…
The Radio Structure of the Narrow-Line Seyfert 1 Mrk 783 with VLBA and e-MERLIN
E. Congiu, P. Kharb, A. Tarchi +9
In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz observations performed with the e-MERLIN interfero…
Black Hole Mergers from Hierarchical Triples in Dense Star Clusters
Miguel A. S. Martinez, Giacomo Fragione, Kyle Kremer +8
Hierarchical triples are expected to be produced by the frequent binary-mediated interactions in the cores of globular clusters. In some of these triples, the tertiary companion ca…
FEEDBACK: a SOFIA Legacy Program to Study Stellar Feedback in Regions of Massive Star Formation
N. Schneider, R. Simon, C. Guevara +37
FEEDBACK is a SOFIA legacy program dedicated to study the interaction of massive stars with their environment. It performs a survey of 11 galactic high mass star forming regions in…
New insights in the HII region G18.88-0.49: hub-filament system and accreting filaments
L. K. Dewangan, D. K. Ojha, Saurabh Sharma +3
We present an analysis of multi-wavelength observations of an area of 0.27 deg x 0.27 deg around the Galactic HII region G18.88-0.49, which is powered by an O-type star (age ~10^5…
The Extreme Red Excess in Blazar Ultraviolet Broad Emission Lines
Brian Punsly, Paola Marziani, Marco Berton +1
We present a study of quasars with very redward asymmetric (RA) ultraviolet (UV) broad emission lines (BELs). An excess of redshifted emission has been previously shown to occur in…
High Molecular Gas Masses in Absorption-selected Galaxies at
Nissim Kanekar, J. Xavier Prochaska, Marcel Neeleman +5
We have used the Atacama Large Millimeter/submillimeter Array (ALMA) to carry out a search for CO (32) or (43) emission from the fields of 12 high-metallicity ([M/H]~$\geq -0…
Probing the origin of low-frequency radio emission in PG quasars with the uGMRT -- I
Silpa S., P. Kharb, L. C. Ho +3
We present the results from 685 MHz observations with the upgraded Giant Metrewave Radio Telescope (uGMRT) of 22 quasars belonging to the Palomar-Green (PG) quasar sample. Only fou…
A SOFIA Survey of [CII] in the galaxy M51 II. [CII] and CO kinematics across spiral arms
Jorge L. Pineda, Juergen Stutzki, Christof Buchbender +10
We present the first complete, velocity-resolved [CII] 158um image of the M51 grand-design spiral galaxy, observed with the upGREAT instrument on SOFIA. [CII] is an important trace…
The OH Megamaser galaxy IRAS11506-3851: an AGN and starformation revealed by multiwavelength observations
C. Hekatelyne, Rogemar A. Riffel, Thaisa Storchi-Bergmann +4
We present Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Hubble Space Telescope (HST) and Very Large Array (VLA) observations of the OH Megamaser (OHM) galaxy…
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…
The disintegrating old open cluster Czernik 3
Saurabh Sharma, Arpan Ghosh, D. K. Ojha +6
We have performed a detailed analysis of the Czernik 3 (Cz3) open cluster by using deep near-infrared photometry taken with TIRCAM2 on 3.6m Devasthal optical telescope along with t…
A Wide-area GMRT 610~MHz survey of ELAIS N1 field
C. H. Ishwara-Chandra, A. R. Taylor, D. A. Green +3
In this paper we present a wide-area 610 MHz survey of the ELAIS\,N1 field with the GMRT, covering an area of 12.8 deg at a resolution of 6 arcsec and with an rms noise of $\si…