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32 papers · 2 filters
Cosmic evolution of star-forming galaxies to in the faint low-frequency radio source population
E. F. Ocran, A. R. Taylor, M. Vaccari +4
We study the properties of star-forming galaxies selected at 610 MHz with the GMRT in a survey covering 1.86 deg down to a noise of 7.1\,Jy / beam. These were id…
Unveiling the importance of magnetic fields in the evolution of dense clumps formed at the waist of bipolar H II regions: a case study on Sh2-201 with JCMT SCUBA-2/POL-2
Chakali Eswaraiah, Di Li, Manash R. Samal +10
We present the properties of magnetic fields (B-fields) in two clumps (clump 1 and clump 2), located at the waist of the bipolar H II region Sh2-201, based on JCMT SCUBA-2/POL-2 ob…
Mass models of gas-rich void dwarf galaxies
Sushma Kurapati, Jayaram N. Chengalur, Peter Kamphuis +1
We construct mass models of eight gas rich dwarf galaxies that lie in the Lynx-Cancer void. From NFW fits to the dark matter halo profile, we find that the concentration parameters…
First detection of the carbon chain molecules 13CCC and C13CC towards SgrB2(M)
Thomas F. Giesen, Bhaswati Mookerjea, Guido W. Fuchs +4
We report the first detection of the isotopologues 13CCC and C13CC. We used the heterodyne receivers GREAT and upGREAT on board SOFIA to search for the ro-vibrational transitions Q…
New insights in giant molecular cloud hosting S147/S153 complex: signatures of interacting clouds
J. S. Dhanya, L. K. Dewangan, D. K. Ojha +1
In order to understand the formation of massive OB stars, we report a multi-wavelength observational study of a giant molecular cloud hosting the S147/S153 complex (size ~90 pc X 5…
Acceleration Relations in the Milky Way as Differentiators of Modified Gravity Theories
Tousif Islam, Koushik Dutta
The dynamical mass of galaxies and the Newtonian acceleration generated from the baryons have been found to be strongly correlated. This correlation is known as 'Mass-Discrepancy A…
Radio-relic and the diffuse emission trail discovered in a low mass galaxy cluster Abell 1697
Surajit Paul, Sameer Salunkhe, Satish Sonkamble +3
We report the discovery of a putative radio relic, 830 kpc in length and found toward the outskirts of galaxy cluster Abell 1697 (), using the LOFAR Two Meter Sky Survey (…
Discovery of a large HI ring around the quiescent galaxy AGC 203001
Omkar Bait, Sushma Kurapati, Pierre-Alain Duc +4
Here we report the discovery with the Giant Metrewave Radio Telescope of an extremely large (115 kpc in diameter) HI ring off-centered from a massive quenched galaxy, AGC 203…
Deep GMRT 610 MHz Observations of the ELAIS N1 Field : Catalogue and Source Counts
E. F. Ocran, A. R. Taylor, M. Vaccari +2
This is the first of a series of papers based on sensitive 610 MHz observations of the ELAIS N1 field using the Giant Metrewave Radio Telescope. We describe the observations, proce…
A catalogue of 108 extended planetary nebulae observed by GALEX
Ananta C. Pradhan, Swayamtrupta Panda, Mudumba Parthasarathy +2
We present the ultraviolet (UV) imaging observation of planetary nebulae (PNe) using archival data of Galaxy Evolution Explorer (GALEX). We found 358 PNe detected by GALEX in near-…
Atomic hydrogen in star-forming galaxies at intermediate redshifts
Apurba Bera, Nissim Kanekar, Jayaram N. Chengalur +1
We have used the upgraded Giant Metrewave Radio Telescope to carry out a deep (117 on-source hours) L-band observation of the Extended Groth Strip, to measure the average neutral h…
A study of Kepler supernova remnant: angular power spectrum estimation from radio frequency data
Preetha Saha, Somnath Bharadwaj, Nirupam Roy +2
Supernova remnants (SNRs) have a variety of overall morphology as well as rich structures over a wide range of scales. Quantitative study of these structures can potentially reveal…
Influence of Wolf-Rayet stars on surrounding star-forming molecular clouds
T. Baug, Richard de Grijs, L. K. Dewangan +5
We investigate the influence of Wolf-Rayet (W-R) stars on their surrounding star-forming molecular clouds. We study five regions containing W-R stars in the inner Galactic plane ($…
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…
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…
UVIT Observations of UV-Bright Stars in four Galactic Globular Clusters
Ranjan Kumar, Ananta C. Pradhan, M. Parthasarathy +3
We have performed photometric analysis of four Galactic globular clusters (GGCs): NGC 4147, NGC 4590, NGC 5053 and NGC 7492 using far-UV and near-UV filters of the Ultraviolet Imag…
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…
The Role of "Black Hole Burning" in the Evolution of Dense Star Clusters
Kyle Kremer, Claire S. Ye, Sourav Chatterjee +2
As self-gravitating systems, dense star clusters exhibit a natural diffusion of energy from their innermost to outermost regions, which leads to a slow and steady contraction of th…
GASP XVII. HI imaging of the jellyfish galaxy JO206: gas stripping and enhanced star formation
M. Ramatsoku, P. Serra, B. M Poggianti +18
We present VLA HI observations of JO206, a prototypical ram-pressure stripped galaxy in the GASP sample. This massive galaxy (M 8.5 10 M) is lo…
Opening the Treasure Chest in Carina
B. Mookerjea, G. Sandell, R. Guesten +3
We have mapped the G287.84-0.82 cometary globule (with the Treasure Chest cluster embedded in it) in the South Pillars region of Carina (i) in [CII], 63micron [OI], and CO(11-10) u…
Prospects for Observing the low-density Cosmic Web in Lyman-alpha Emission
Joris Witstok, Ewald Puchwein, Girish Kulkarni +2
Mapping the intergalactic medium (IGM) in Lyman- emission would yield unprecedented tomographic information on the large-scale distribution of baryons and potentially provide ne…
Unveiling molecular clouds toward bipolar HII region G8.14+0.23
L. K. Dewangan, H. Sano, R. Enokiya +3
Most recent numerical simulations suggest that bipolar HII regions, powered by O-type stars, can be formed at the interface of two colliding clouds. To observationally understand t…
Unveiling the 100 pc scale nuclear radio structure of NGC 6217 with e-MERLIN and the VLA
David R. A. Williams, Ian M. McHardy, Ranieri D. Baldi +13
We present high-sensitivity 1.51 GHz e-MERLIN radio images of the nearby galaxy NGC 6217. We resolve the compact radio source at the centre of NGC 6217 for the first time, finding…
Observational signatures of end-dominated collapse in the S242 filamentary structure
Lokesh K. Dewangan, Lev E. Pirogov, Olga L. Ryabukhina +2
We present new CO (13CO(1-0) and C18O(1-0)) and CS(2-1) line observations of an elongated filamentary structure (length ~30 pc) in the star-forming site S242, which were taken with…