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14 papers · 2 filters
Study of morphology and stellar content of the Galactic HII region IRAS 16148-5011
K. K. Mallick, D. K. Ojha, M. Tamura +3
An investigation of the IRAS 16148-5011 region - a cluster at a distance of 3.6 kpc - is presented here, carried out using multiwavelength data in near-infrared (NIR) from the 1.4m…
Star formation around the mid-infrared bubble CN 148
L. K. Dewangan, D. K. Ojha, J. M. C. Grave +1
We present a multi-wavelength study to analyse the star formation process associated with the mid-infrared bubble CN 148 (H II region G10.3-0.1), which harbors an O5V-O6V star. The…
The relation between atomic gas and star formation rate densities in faint irregular galaxies
Sambit Roychowdhury, Jayaram N. Chengalur, Serafim S. Kaisin +1
We use data for faint (M_B > -14.5) dwarf irregular galaxies drawn from the FIGGS survey to study the correlation between the atomic gas density (Sigma_gas,atomic) and star formati…
HI in the Arp 202 system and its tidal dwarf candidate
Chandreyee Sengupta, T. C. Scott, K. S. Dwarakanath +2
We present results from our Giant Metrewave Radio Telescope (GMRT) HI observations of the interacting pair Arp 202 (NGC 2719 and NGC 2719A). Earlier deep UV(GALEX) observations of…
NGC 7538 : Multiwavelength Study of Stellar Cluster Regions associated with IRS 1-3 and IRS 9 sources
K. K. Mallick, D. K. Ojha, M. Tamura +7
We present deep and high-resolution (FWHM ~ 0.4 arcsec) near-infrared (NIR) imaging observations of the NGC 7538 IRS 1-3 region (in JHK bands), and IRS 9 region (in HK bands) using…
An extremely optically dim tidal feature in the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877
K. Lee-Waddell, K. Spekkens, J. -C. Cuillandre +7
We present GMRT HI observations and deep CFHT MegaCam optical images of the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877 (hereafter NGC 871/6/7). Our high-resolution d…
First detection of [N II] 205 micrometer absorption in interstellar gas
C. M. Persson, M. Gerin, B. Mookerjea +8
We present high resolution [NII] 205 micrometer ^3P_1-^3P_0 spectra obtained with Herschel-HIFI towards a small sample of far-infrared bright star forming regions in the Galactic p…
Constraints on the gas masses of low-z damped Lyman- systems
Parichay Mazumdar, Nissim Kanekar, J. Xavier Prochaska
We report a deep search for redshifted HI 21 cm emission from three damped and sub-damped Lyman- absorbers (DLAs) at with the Green Bank Telescope (GBT). No evid…
An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: radio properties and the far-infrared/radio correlation
A. P. Thomson, R. J. Ivison, J. M. Simpson +18
We present a study of the radio properties of 870m-selected submillimetre galaxies (SMGs), observed at high resolution with ALMA in the Extended Chandra Deep Field South. From o…
Dynamics of ten clusters of galaxies with substructures
Kiran Lakhchaura, K. P. Singh
We present a detailed Chandra study of a sample of ten clusters of galaxies selected based on the presence of substructures in their optical images. The X-ray surface brightness ma…
Detection of a dense clump in a filament interacting with W51e2
B. Mookerjea, C. Vastel, G. E. Hassel +8
In the framework of the Herschel/PRISMAS Guaranteed Time Key Program, the line of sight to the distant ultracompact HII region W51e2 has been observed using several selected molecu…
Star formation activity in the southern Galactic HII region G351.63-1.25
S. Vig, S. K. Ghosh, D. K. Ojha +2
The southern Galactic high mass star-forming region, G351.6-1.3, is a HII region-molecular cloud complex with a luminosity of 2.0 x 10^5 L_sun, located at a distance of 2.4 kpc. In…
A Stellar Population Synthesis Model for the Study of Ultraviolet Star Counts of the Galaxy
Ananta C. Pradhan, D. K. Ojha, A. C. Robin +2
GALEX, the first all sky imaging UV satellite, has imaged a large part of the sky providing an excellent opportunity for studying UV star counts. The aim of our study is to investi…
Evidence for a constant IMF in early-type galaxies based on their X-ray binary populations
Mark B. Peacock, Stephen E. Zepf, Thomas J. Maccarone +4
A number of recent studies have proposed that the stellar initial mass function (IMF) of early type galaxies varies systematically as a function of galaxy mass, with higher mass ga…