102 citations · 527 across the 27 of their papers we have counts for
26 papers · 1 filter
Detection of the H92alpha recombination line from the starbursts in the Circinus galaxy and NGC 1808
A. L. Roy, W. M. Goss, K. R. Anantharamaiah
Context. Gas ionized by starburst activity radiates radio recombination lines (RRLs), from which one can derive the plasma conditions and the number of massive stars formed in the…
VLA H53alpha and H92alpha line observations of the central region of NGC 253
C. A. Rodriguez-Rico, W. M. Goss, J. -H. Zhao +2
We present new Very Large Array (VLA) observations toward NGC 253 of the recombination line H53alpha (43 GHz) at an angular resolution of 1.''5 X 1.''0. The free-free emission at 4…
VLA Observations of Carbon 91 Recombination Line Emission in W49 North
D. Anish Roshi, C. G. De Pree, W. M. Goss +1
We have detected C91 (8.5891 GHz) emission toward 4 ultra-compact \HII regions (\UCHII s; W49G, J, L & C) in the W49 North massive star forming region with the Very Large Array…
VLA H53alpha radio recombination line observations of the ultraluminous infrared galaxy Arp 220
C. A. Rodriguez-Rico, W. M. Goss, F. Viallefond +3
We present high angular resolution (0.7'') observations made with the Very Large Array (VLA) of the radio recombination line (RRL) H53alpha and radio continuum emission at 43 GHz f…
Multi-wavelength carbon recombination line observations with the VLA toward an UCHII region in W48: Physical properties and kinematics of neutral material
D. Anish Roshi, W. M. Goss, K. R. Anantharamaiah +1
Using the Very Large Array (VLA) the C76 and C53 recombination lines (RLs) have been detected toward the ultra-compact \HII\ region (UCHII region) G35.201.74. We also obta…
Radio Recombination Lines from the Starburst Galaxy NGC 3256
A. L. Roy, W. M. Goss, Niruj R. Mohan +1
We have detected the radio recombination lines H91-alpha and H92-alpha with rest frequencies of 8.6 GHz and 8.3 GHz from the starburst nucleus NGC 3256 at an angular resolution of…
Multi-density model of the ionised gas in NGC 253 using radio recombination lines
Niruj R. Mohan, W. M. Goss, K. R. Anantharamaiah
We have imaged the H92alpha (8.3 GHz), H75alpha (15 GHz), and H166alpha (1.4 GHz) Radio Recombination Lines (RRLs) from NGC 253 at resolutions of 4.5 pc (0.4"), 2.5 pc (0.2") and 5…
Radio Recombination Lines from Starbursts: NGC 3256, NGC 4945 and the Circinus Galaxy
A. L. Roy, W. M. Goss, Niruj R. Mohan +2
A renewed attempt to detect radio recombination lines from external galaxies has resulted in the measurement of lines from several bright starburst galaxies. The lines are produced…
VLA H92 Alpha and H53 Alpha Radio Recombination Line Observations of M82
C. A. Rodriguez-Rico, F. Viallefond, J. -H. Zhao +2
We present high angular resolution (0.6'') observations made with the VLA of the radio continuum at 8.3 and 43 GHz as well as H92 Alpha and H53 Alpha radio recombination lines from…
GMRT detection of HI 21 cm associated absorption towards the z=1.2 red quasar 3C 190
C. H. Ishwara-Chandra, K. S. Dwarakanath, K. R. Anantharamaiah
We report the GMRT detection of associated HI 21 cm-line absorption in the z=1.1946 red quasar 3C 190. Most of the absorption is blue-shifted with respect to the systemic redshift.…
A VLBA Search for a Stimulated Recombination Line from the Accretion Region in NGC1275
R. C. Walker, K. R. Anantharamaiah
The radio source 3C84, in NGC1275, has a two sided structure on parsec scales. The northern feature, presumed to be associated with a jet moving away from the Earth, shows strong e…
GMRT and VLA observations of HI and OH from the Seyfert galaxy Mrk 1
A. Omar, K. S. Dwarakanath, M. Rupen +1
We present Giant Meterwave Radio Telescope (GMRT) observations of the HI 21 cm line and Very Large Array (VLA) observations of the OH 18 cm line from the Seyfert 2 galaxy Mrk 1. HI…
GMRT HI imaging survey of ERIDANUS group of galaxies
Amitesh Omar, K. S. Dwarakanath, K. R. Anantharamaiah
This project aims to image a subset of galaxies in the nearby group Eridanus in HI emission and in radio continuum using the GMRT. The typical resolution of HI images will be $\sim…
VLA Detection of RRLs from the radio nucleus of NGC 253 : Ionization by a weak AGN, an obscured SSC or a compact SNR ?
Niruj R. Mohan, K. R. Anantharamaiah, W. M. Goss
We have imaged the H92alpha and H75alpha radio recombination line (RRL) emissions from the starburst galaxy NGC 253 with a resolution of ~4 pc. The peak of the RRL emission at both…
VLA detection of OH absorption from the elliptical galaxy NGC 1052
Amitesh Omar, K. R. Anantharamaiah, Michael Rupen +1
VLA observations of OH absorption towards the elliptical galaxy NGC 1052 are presented. Both OH lines, at 1665 and 1667 MHz, were detected in absorption towards the center of NGC 1…
VLA Observations of the H92alpha line from NGC 5253 and Henize 2-10 : Ionized Gas around Super Star Clusters
Niruj R. Mohan, K. R. Anantharamaiah, W. M. Goss
We have detected the H92alpha radio recombination line from two dwarf starburst galaxies, NGC 5253 and He 2-10, using the Very Large Array. Both the line data as well as the radio…
Carbon Recombination Lines from the Galactic Plane at 34.5 & 328 MHz
N. G. Kantharia, K. R. Anantharamaiah
We present results of a search for carbon recombination lines in the Galaxy at 34.5 MHz (C) made using the dipole array at Gauribidanur near Bangalore. Observations made towa…
The Central Velocity Field in NGC 253 : Possible Indication of a Bar
Mousumi Das, K. R. Anantharamaiah, M. S. Yun
We have investigated whether motion of gas in a bar-like potential can account for the peculiar but systematic velocity field observed in the nuclear region of the starburst galaxy…
Search for radio recombination lines towards the gravitational lens PKS 1830-211
Niruj R. Mohan, K. R. Anantharamaiah, W. M. Goss
A search for radio recombination lines near 20 cm at z=0.193 and z=0.886 towards the gravitational lens system PKS 1830-211 has yielded upper limits on the line optical depth of 5…
Radio recombination lines from starburst galaxies : high and low density ionized gas
Niruj R. Mohan, K. R. Anantharamaiah, W. M. Goss
Radio recombination lines (RRL) at 8 GHz and 15 GHz detected from four starburst galaxies are shown to arise in compact high density HII regions, which are undetectable below ~4 GH…
Starburst in the Ultra-luminous Galaxy Arp 220 - Constraints from Observations of Radio Recombination Lines and Continuum
K. R. Anantharamaiah, F. Viallefond, Niruj R. Mohan +2
We present observations of radio recombination lines from the starburst galaxy Arp 220 at 1.4, 8.1, 84, 96 and 207 GHz (sensitive upper limit for the 1.4 GHz line and firm detectio…
Discovery of a Non-Thermal Galactic Center Filament (G358.85+0.47) Parallel to the Galactic Plane
Cornelia C. Lang, K. R. Anantharamaiah, N. E. Kassim +1
We report the discovery of a new non-thermal filament, G358.85+0.47, the ``Pelican'', located ~225 pc in projection from SgrA, and oriented parallel to the Galactic plane. VLA cont…
High Rydberg State Carbon Recombination Lines from Interstellar Clouds
K. R. Anantharamaiah, Nimisha G. Kantharia
We report observations of carbon recombination lines near 34.5 MHz (qunatum number n=578) and 325 MHz (n=272) made towards Cas A, the Galactic centre and about ten other directions…
Ionized Gas in the SgrA Complex - VLA Observations of H168alpha and H270alpha Recombination Lines
K. R. Anantharamaiah, A. Pedlar, W. M. Goss
Radio recombination lines at a wavelength of 20 cm reveals the presence of an extended component of ionized gas of lower density in the Sgr A complex. This component extends well b…