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The Detection of 3He+ in a Planetary Nebula Using the VLA
Dana S. Balser, W. M. Goss, T. M. Bania +1
We used the VLA to search for 3He+ emission from two Galactic planetary nebulae (PNe): NGC6572 and J320}. Standard stellar models predict that the 3He/H abundance ratios for PNe sh…
Radio Emission from the Double-Pulsar System J0737-3039 Revisited
S. Chatterjee, W. M. Goss, W. F. Brisken
The double pulsar J0737-3039 is the only known system in which the relativistic wind emitted by a radio pulsar demonstrably interacts with the magnetosphere of another one. We repo…
Getting Its Kicks: A VLBA Parallax for the Hyperfast Pulsar B1508+55
S. Chatterjee, W. H. T. Vlemmings, W. F. Brisken +7
The highest velocity neutron stars establish stringent constraints on natal kicks, asymmetries in supernova core collapse, and the evolution of close binary systems. Here we presen…
Pulsar Astrometry at the Microarcsecond Level
W. H. T. Vlemmings, S. Chatterjee, W. F. Brisken +12
Determination of pulsar parallaxes and proper motions addresses fundamental astrophysical questions. We have recently finished a VLBI astrometry project to determine the proper mot…
Stellar Winds and Embedded Star Formation in the Galactic Center Quintuplet and Arches Clusters: Multifrequency Radio Observations
Cornelia C. Lang, Kelsey E. Johnson, W. M. Goss +1
A multi-frequency, multi-configuration study has been made of the compact radio sources in the Galactic Center Quintuplet and Arches stellar clusters using the Very Large Array. Te…
A Radio Transient 0.1 pc from Sagittarius A*
Geoffrey C. Bower, Doug A. Roberts, Farhad Yusef-Zadeh +5
We report the discovery of a transient radio source 2.7 arcsec (0.1 pc projected distance) South of the Galactic Center massive black hole, Sagittarius A*. The source flared with a…
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…
Spatial and Temporal Variations in Small-Scale Galactic HI Structure Toward 3C~138
C. L. Brogan, B. A. Zauderer, T. J. Lazio +3
We present three epochs of VLBA observations of Galactic HI absorption toward the quasar 3C~138 with resolutions of 20 mas (~ 10 AU). This analysis includes VLBA data from observat…
VLA observations of broad 6-cm excited state OH lines in W49A
Patrick Palmer, W. M. Goss
Using the Very Large Array (VLA), we observed all three of the 6-cm lines of the doublet Pi 1/2, J=1/2 state of OH with sub-arcsecond resolution (about 0.4 arcsec) in W49A. While t…
The OH (1720 MHz) Supernova Remnant Masers in W44: MERLIN and VLBA Polarization Observations
Ian M. Hoffman, W. M. Goss, C. L. Brogan +1
Full-polarization MERLIN and VLBA observations of the 1720-MHz maser emission from the OH molecule in the supernova remnant W44 are presented. Zeeman splitting has been directly re…
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…
Simultaneous Multi-Wavelength Observations of Sgr A*
T. an, W. M. Goss, J. -H. Zhao +4
We observed Sgr A* using the Very Large Array (VLA) and the Giant Metrewave Radio Telescope (GMRT) at multiple cm and mm wavelengths on 17 June 2003. The measured flux densities of…
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…
An 8.5 GHz Arecibo survey of Carbon Recombination Lines toward Ultra-compact \HII regions: Physical properties of dense molecular material
D. Anish Roshi, Dana. S. Balser, T. M. Bania +2
We report here on a survey of carbon recombination lines (RLs) near 8.5 GHz toward 17 ultra-compact \HII regions (\UCHII s). Carbon RLs are detected in 11 directions, indicating th…