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31 papers · 2 filters
Star formation in the Sh 2-53 region influenced by accreting molecular filaments
T. Baug, L. K. Dewangan, D. K. Ojha +6
We present a multi-wavelength analysis of a 3030 area around the Sh 2-53 region (hereafter S53 complex), which is associated with at least three H II regions, tw…
From light to baryonic mass: the effect of the stellar mass-to-light ratio on the Baryonic Tully-Fisher relation
Anastasia A. Ponomareva, Marc A. W. Verheijen, Emmanouil Papastergis +2
In this paper we investigate the statistical properties of the Baryonic Tully-Fisher relation (BTFr) for a sample of 32 galaxies with accurate distances based on Cepheids and/or TR…
Halo models of HI selected galaxies
Niladri Paul, Tirthankar Roy Choudhury, Aseem Paranjape
Modelling the distribution of neutral hydrogen (HI) in dark matter halos is important for studying galaxy evolution in the cosmological context. We use a novel approach to infer th…
Planetary Nebulae with Ultra-Violet Imaging Telescope (UVIT): Far Ultra-violet halo around the Bow Tie nebula (NGC 40)
N. Kameswara Rao, F. Sutaria, J. Murthy +3
Context. NGC 40 is a planetary nebula with diffuse X-ray emission, suggesting an interaction of the high speed wind from WC8 central star (CS) with the nebula. It shows strong Civ…
Gemini IFU, VLA and HST observations of the OH Megamaser galaxy IRASF23199+0123: the hidden monster and its outflow
Carpes Hekatelyne, Rogemar A. Riffel, Dinalva Sales +6
We present Gemini Multi-Object Spectrograph (GMOS) Integral field Unit (IFU), Very Large Array (VLA) and Hubble Space Telescope (HST) observations of the OH Megamaser (OHM) galaxy…
New insights in the mid-infrared bubble N49 site: a clue of collision of filamentary molecular clouds
L. K. Dewangan, D. K. Ojha, I. Zinchenko
We investigate the star formation processes operating in a mid-infrared bubble N49 site, which harbors an O-type star in its interior, an ultracompact HII region, and a 6.7 GHz met…
Probing the massive star forming environment - a multiwavelength investigation of the filamentary IRDC G333.73+0.37
V. S. Veena, S. Vig, B. Mookerjea +3
We present a multiwavelength study of the filamentary infrared dark cloud (IRDC) G333.73+0.37. The region contains two distinct mid-infrared sources S1 and S2 connected by dark lan…
A Giant Metrewave Radio Telescope search for associated H{\sc i} 21\,cm absorption in GHz-peaked-spectrum sources
J. N. H. S. Aditya, Nissim Kanekar
We report the first detections of associated H{\sc i} 21\,cm absorption in Gigahertz-peaked-spectrum (GPS) sources at high redshifts, , using the Giant Metrewave Radio Teles…
The gas and stellar mass of low-redshift damped Lyman- absorbers
Nissim Kanekar, Marcel Neeleman, J. Xavier Prochaska +1
We report Hubble Space Telescope Cosmic Origins Spectrograph far-ultraviolet and Arecibo Telescope H{\sc i} 21cm spectroscopic studies of six damped and sub-damped Lyman- absorb…
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…
New giant radio sources and underluminous radio halos in two galaxy clusters
V. Cuciti, G. Brunetti, R. van Weeren +5
The aim of this work is to analyse the radio properties of the massive and dynamical disturbed clusters Abell 1451 and Zwcl 0634.1+4750, especially focusing on the possible presenc…
A candidate sub-parsec binary black hole in the Seyfert galaxy NGC 7674
Preeti Kharb, Dharam Vir Lal, David Merritt
The existence of binary supermassive black holes (SBHs) is predicted by models of hierarchical galaxy formation. To date, only a single binary SBH has been imaged, at a projected s…
Observational signatures of cloud-cloud collision in the extended star-forming region S235
L. K. Dewangan, D. K. Ojha
We present a multi-wavelength data analysis of the extended star-forming region S235 (hereafter E-S235), where two molecular clouds are present. In E-S235, using the 12CO (1-0) and…
Infrared dust bubble CS51 and its interaction with the surrounding interstellar medium
Swagat Ranjan Das, Anandmayee Tej, Sarita Vig +4
A multiwavelength investigation of the southern infrared dust bubble CS51 is presented in this paper. We probe the associated ionized, cold dust, molecular and stellar components.…
Embedded filaments in IRAS 05463+2652: early stage of fragmentation and star formation activities
L. K. Dewangan, R. Devaraj, T. Baug +1
We present a multi-wavelength data analysis of IRAS 05463+2652 (hereafter I05463+2652) to study star formation mechanisms. A shell-like structure around I05463+2652 is evident in t…
Probing the Physics of Narrow Line Regions in Active Galaxies IV: Full data release of The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)
Adam D. Thomas, Michael A. Dopita, Prajval Shastri +15
We present the second and final data release of the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7). Data are presented for 63 new galaxies not included in the fi…
[CI], [CII] and CO emission lines as a probe for alpha variations at low and high redshifts
S. A. Levshakov, K. -W. Ng, C. Henkel +1
The offsets between the radial velocities of the rotational transitions of carbon monoxide and the fine structure transitions of neutral and singly ionized carbon are used to test…
Dissecting Galaxies: Separating Star Formation, Shock Excitation and AGN Activity in the Central Region of NGC 613
Rebecca L. Davies, Brent Groves, Lisa J. Kewley +13
The most rapidly evolving regions of galaxies often display complex optical spectra with emission lines excited by massive stars, shocks and accretion onto supermassive black holes…
On the interdependence of galaxy morphology, star formation, and environment in massive galaxies in the nearby Universe
Omkar Bait, Sudhanshu Barway, Yogesh Wadadekar
Using multi-wavelength data, from UV-optical-near-mid IR, for 6000 galaxies in the local Universe, we study the dependence of star formation on the morphological T-types for…
The molecular cloud S242: physical environment and star formation activities
L. K. Dewangan, T. Baug, D. K. Ojha +3
We present a multi-wavelength study to probe the star formation (SF) processes on a larger scale (~1.05 deg x 0.56 deg) around the S242 site. The S242 molecular cloud is depicted i…
Multi-wavelength study of flaring activity in HBL 1ES 1959+650 during 2015-16
Navpreet Kaur, S. Chandra, Kiran S Baliyan +2
We present the results from a multiwavelength study of the flaring activity in HBL, 1ES 1959+650, during January 2015-June 2016. The source underwent significant flux enhancements…
Detection of Two Intervening Ne VIII Absorbers Probing Warm Gas at z~0.6
Sachin Pachat, Anand Narayanan, Vikram Khaire +3
We report on the detection of two Ne VIII absorbers, at z = 0.61907 and z = 0.57052 in the HST/COS spectrum of background quasars SDSS J 080908.13+461925.6 and SBS 1122+594 respect…
Hub-filament system in IRAS 05480+2545: young stellar cluster and 6.7 GHz methanol maser
Lokesh K. Dewangan, Devendra K. Ojha, Tapas Baug
To probe the star formation (SF) process, we present a multi-wavelength study of IRAS 05480+2545 (hereafter I05480+2545). Analysis of Herschel data reveals a massive clump (M_clump…
Kiloparsec-scale emission in the narrow-line Seyfert 1 galaxy Mrk 783
E. Congiu, M. Berton, M. Giroletti +12
We present the first results of a radio survey of 79 narrow-line Seyfert 1 (NLS1) carried out with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A configuration aimed at s…