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A Search for 6.7 GHz Methanol Masers in M33
P. F. Goldsmith, J. D. Pandian, A. A. Deshpande
We report the negative results from a search for 6.7 GHz methanol masers in the nearby spiral galaxy M33. We observed 14 GMCs in the central 4 kpc of the Galaxy, and found 3 sigma…
The Arecibo Methanol Maser Galactic Plane Survey--I: Data
Jagadheep D. Pandian, Paul F. Goldsmith, Avinash A. Deshpande
We present the results of an unbiased survey for 6.7 GHz methanol masers in the Galactic plane carried out using the 305 m Arecibo radio telescope. A total of 18.2 square degrees w…
Further Evidence for Collimated Particle Beams from Pulsars, and Precession
Avinash A. Deshpande, V. Radhakrishnan
We follow up on our (Radhakrishnan & Deshpande, 2001: RD01) radically different interpretation of the observed structures and morphologies in the x-ray observations of the nebulae…
Intrinsic short time scale variability of W3(OH) maser
R. Ramachandran, A. A. Deshpande, W. M. Goss
We have studied the OH masers in the star forming region, W3(OH), with data obtained from the Very Long Baseline Array (VLBA). The data provide an angular resolution of 5 mas…
Instantaneous Radio Spectra of Giant Pulses from the Crab Pulsar from Decimeter to Decameter Wavelengths
M. V. Popov, A. D. Kuzmin, O. M. Ul'yanov +7
The results of simultaneous multifrequency observations of giant radio pulses from the Crab pulsar, PSR B0531+21, at 23, 111, and 600 MHz are presented and analyzed. Giant pulses w…
Arecibo and the ALFA Pulsar Survey
J. van Leeuwen, J. M. Cordes, D. R. Lorimer +34
The recently started Arecibo L-band Feed Array (ALFA) pulsar survey aims to find ~1000 new pulsars. Due to its high time and frequency resolution the survey is especially sensitive…
HI Density Distribution Driven by Supernovae: A Simulation Study
Jacqueline A. Hodge, Avinash A. Deshpande
We model the complex distribution of atomic hydrogen (HI) in the interstellar medium (ISM) assuming that it is driven entirely by supernovae (SN). We develop and assess two differe…
The young, highly relativistic binary pulsar J1906+0746
D. R. Lorimer, I. H. Stairs, P. C. C. Freire +33
We report the discovery of PSR J1906+0746, a young 144-ms pulsar in a highly relativistic 3.98-hr orbit with an eccentricity of 0.085 and expected gravitational wave coalescence ti…
Arecibo Pulsar Survey Using ALFA. I. Survey Strategy and First Discoveries
J. M. Cordes, P. C. C. Freire, D. R. Lorimer +21
We report results from the initial stage of a long-term pulsar survey of the Galactic plane using the Arecibo L-band Feed Array (ALFA), a seven-beam receiver operating at 1.4 GHz w…
The Vela pulsar, the key?
Richard Dodson, Dion Lewis, David Legge +4
Of all pulsars known Vela has been one of the most productive in terms in understanding pulsars and their characteristics. We present the latest results derived from Australian tel…
The radio luminosity distribution of pulsars in 47 Tucanae
D. McConnell, A. A. Deshpande, T. Connors +1
We have used the Australia Telescope Compact Array to seek the integrated radio flux from all the pulsars in the core of the globular cluster 47 Tucanae. We have detected an extend…
The Vela Pulsar's Radio Nebula
R. Dodson, D. Lewis, D. McConnell +1
We have discovered that the radio nebula surrounding the Vela pulsar covers a much wider extent than previously reported, with two lobes to the North and South of the pulsar. Indic…
The Vela Pulsar Wind Nebula at 6cm
Dion Lewis, Richard Dodson, David McConnell +1
Observations using the Australia Telescope Compact Array at a wavelength of 6 cm have uncovered the radio counterpart to the compact X-ray nebula surrounding the Vela pulsar. Two l…
Search for Discrete Refractive Scattering Events
R. Ramachandran, A. A. Deshpande, B. W. Stappers
We have searched for discrete refractive scattering events (including effects due to possible non-multiple diffractive scattering) at meter wavelengths in the direction of two clos…
Upper Limits On Periodic, Pulsed Radio Emission from the X-Ray Point Source in Cassiopeia A
M. A. McLaughlin, J. M. Cordes, A. A. Deshpande +4
The Chandra X-ray Observatory recently discovered an X-ray point source near the center of Cassiopeia A, the youngest known Galactic supernova remnant. We have conducted a sensitiv…
The Small-scale Structure in Interstellar HI: A Resolvable Puzzle
Avinash A. Deshpande
During the past decade or so, measurements of Galactic HI absorption using VLBI against extra-galactic sources, as well as multi-epoch observatios in pulsar directions, have detect…
Pulsar Magnetospheric Emission Mapping: Images and Implications of Polar-Cap Weather
Avinash A. Deshpande, Joanna M. Rankin
The beautiful sequences of ``drifting'' subpulses observed in some radio pulsars have been regarded as among the most salient and potentially instructive characteristics of their e…
Revisiting the Shape of Pulsar Beams
D. Mitra, A. A. Deshpande
Characterizing the shape and evolution of pulsar radio emission beams is important for understanding the observed emission. The various attempts by earlier workers investigating be…
A Survey of the Galactic Plane for 6.7-GHz Methanol Masers I: l = 325.0 - 335.0 ; b = -0.53 - 0.53
S. P. Ellingsen, M. L. von Bibra, P. M. McCulloch +3
We report the results of the first complete survey of an area of the Galactic Plane for maser emission from the 6.7-GHz transition of methanol. The survey covers a 10.6-square-degr…