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31 papers · 2 filters
A Candidate Dual AGN in a Double-peaked Emission-line Galaxy with Precessing Radio Jets
Rubinur Khatun, M. Das, P. Kharb +1
We present high resolution radio continuum observations with the Karl G. Jansky Very Large Array at 6, 8.5, 11.5 and 15 GHz of the double-peaked emission-line galaxy 2MASXJ12032061…
Tale of J1328+2752: a misaligned double-double radio galaxy hosted by a binary black-hole?
S. Nandi, M. Jamrozy, R. Roy +4
We present a radio and optical study of the double-double radio galaxy J1328+2752 based on new low-frequency GMRT observations and SDSS data. The radio data were used to investigat…
Implications of an updated ultraviolet background for the ionization mechanisms of intervening Ne VIII absorbers
Tanvir Hussain, Vikram Khaire, Raghunathan Srianand +2
Ne VIII absorbers seen in QSO spectra are useful tracers of warm ionized gas, when collisional ionization is the dominant ionization process. While photoionization by the ultraviol…
Giant Metrewave Radio Telescope detection of associated HI 21cm absorption at towards TXS1954+513
J. N. H. S. Aditya, Nissim Kanekar, J. Xavier Prochaska +3
We have used the 610 MHz receivers of the Giant Metrewave Radio Telescope (GMRT) to detect associated HI 21cm absorption from the blazar TXS1954+513. The GMRT HI 21cm…
Deuterium fractionation of a distant cold dark cloud along the line of sight of W51
C. Vastel, B. Mookerjea, J. Pety +1
Herschel/HIFI observations toward the compact HII region W51 has revealed the presence of a cold dense core along its line of sight in a high-velocity stream located just in front…
Discovery of a fourth arc in Abell 2626 at 610 MHz with the GMRT: Spectral properties and possibilities for the origin
Ruta Kale, Myriam Gitti
We report the discovery of a fourth eastern arc (Arc E) towards the cool-core cluster Abell 2626 using 610 MHz Giant Metrewave Radio Telescope observations. Three arcs towards nort…
Tracking galaxy evolution through low frequency radio continuum observations using SKA and Citizen-science Research using Multi-wavelength data
Ananda Hota, Chiranjib Konar, C. S. Stalin +6
We present a review on galaxy black hole co-evolution through merger, star formation and AGN-jet feedback. We highlight results on transitional galaxies (e.g. NGC1482, NGC6764, NGC…
Radio light curve of the galaxy possibly associated with FRB150418
S. Johnston, E. F. Keane, S. Bhandari +13
We present observations made with the Australia Telescope Compact Array (ATCA), the Jansky Very Large Array (JVLA) and the Giant Metre-Wave Telescope of the radio source within the…
The physical environment around IRAS 17599-2148: infrared dark cloud and bipolar nebula
L. K. Dewangan, D. K. Ojha, I. Zinchenko +3
We present a multi-scale and multi-wavelength study to investigate the star formation process around IRAS 175992148 that is part of an elongated filamentary structure (EFS) (ext…
Multi-wavelength study of the star-formation in the S237 H II region
L. K. Dewangan, D. K. Ojha, I. Zinchenko +2
We present a detailed multi-wavelength study of observations from X-ray, near-infrared to centimeter wavelengths to probe the star formation processes in the S237 region. Multi-wav…
PALOMA: A Magnetic CV between Polars and Intermediate Polars
Arti Joshi, J. C. Pandey, K. P. Singh +1
We present analyses of archival X-ray data obtained from the XMM-Newton satellite and optical photometric data obtained from 1 m class telescopes of ARIES, Nainital of a magnetic c…
Star formation around mid-infrared bubble N37: Evidence of cloud-cloud collision
T. Baug, L. K. Dewangan, D. K. Ojha +1
We have performed a multi-wavelength analysis of a mid-infrared (MIR) bubble N37 and its surrounding environment. The selected 1515 area around the bubble contains two…
The molecular gas mass of M33
P. Gratier, J. Braine, K. Schuster +15
[Abridged] Do some environments favor efficient conversion of molecular gas into stars? To answer this, we need to be able to estimate the H2 mass. Traditionally, this is done usin…
Decoding quasars: gravitationally redshifted spectral lines !
Nimisha G. Kantharia
Further investigation of data on quasars, especially in the ultraviolet band, yields an amazingly coherent narrative which we present in this paper. Quasars are characterised by st…
The evolution of far-infrared CO emission from protostars
P. Manoj, J. D. Green, S. T. Megeath +7
We investigate the evolution of far-IR CO emission from protostars observed with Herschel/PACS for 50 sources from the combined sample of HOPS and DIGIT Herschel key programs. From…
Herschel/PACS far-IR spectral imaging of a jet from an intermediate mass protostar in the OMC-2 region
B. Gonzalez-Garcia, P. Manoj, D. M. Watson +10
We present the first detection of a jet in the far-IR [O I] lines from an intermediate mass protostar. We have carried out a Herschel/PACS spectral mapping study in the [O I] lines…
Near-Infrared Imaging of Barred Halo Dominated Low Surface Brightness Galaxies
M. Honey, M. Das, J. P. Ninan +1
We present a near-infrared (NIR) imaging study of barred low surface brightness (LSB) galaxies using the TIFR near-infrared Spectrometer and Imager (TIRSPEC). LSB galaxies are dark…
Star forming activity in the H II regions associated with IRAS 17160-3707 complex
G. Nandakumar, V. S. Veena, S. Vig +3
We present a multiwavelength investigation of star formation activity towards the southern H II regions associated with IRAS 17160-3707, located at a distance of 6.2 kpc with a bol…
Characterizing the Youngest Herschel-detected Protostars II. Molecular Outflows from the Millimeter and the Far-infrared
John J. Tobin, Amelia M. Stutz, P. Manoj +7
We present CARMA CO (J=1-0) observations and Herschel PACS spectroscopy, characterizing the outflow properties toward extremely young and deeply embedded protostars in the Orion mo…
Models of the Cosmological 21 cm Signal from the Epoch of Reionization Calibrated with Lyman-alpha and CMB Data
Girish Kulkarni, Tirthankar Roy Choudhury, Ewald Puchwein +1
We present here 21 cm predictions from high dynamic range simulations for a range of reionization histories that have been tested against available Lyman-alpha and CMB data. We ass…
Torques and angular momentum: Counter-rotation in galaxies and ring galaxies
N. G. Kantharia
We present an alternate origin scenario to explain the observed phenomena of (1) counter-rotation between different galaxy components and (2) the formation of ring galaxies. We sug…
A multiwavelength investigation of the HII region S311: Young stellar population and star formation
Ram Kesh Yadav, A. K. Pandey, Saurabh Sharma +9
We present a multiwavelength investigation of the young stellar population and star formation activities around the \hii region Sharpless 311. Using our deep near-infrared observat…
The frequency and properties of young tidal dwarf galaxies in nearby gas-rich groups
K. Lee-Waddell, K. Spekkens, P. Chandra +8
We present high-resolution Giant Metrewave Radio Telescope (GMRT) HI observations and deep Canada-France-Hawaii Telescope (CFHT) optical imaging of two galaxy groups: NGC 4725/47 a…
Star formation activity in the neighbourhood of W-R 1503-160L star in the mid-infrared bubble N46
L. K. Dewangan, T. Baug, D. K. Ojha +4
In order to investigate star formation (SF) processes in extreme environments, we have carried out a multi-wavelength analysis of the mid-infrared bubble N46, which hosts a WN7 Wol…