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19912026
Showing 1999 · astro-phShow all

40 papers · 2 filters

astro-ph1999★ 7 cited

Physics of Neutron Star Kicks

Dong Lai

It is no longer necessary to `sell' the idea of pulsar kicks, the notion that neutron stars receive a large velocity (a few hundred to a thousand km s) at birth. However, th…

astro-ph1999★ 18 cited

A VLA Search for the Geminga Pulsar: A Bayesian Limit on a Scintillating Source

M. A. McLaughlin, J. M. Cordes, T. H. Hankins +1

We derive an upper limit of 3 mJy (95% confidence) for the flux density at 317 MHz of the Geminga pulsar (J0633+1746). Our results are based on 7 hours of fast-sampled VLA data, wh…

astro-ph1999

A Search for OH Megamasers at z > 0.1: Preliminary Results

J. Darling, R. Giovanelli

We report the discovery of 11 OH megamasers and one OH absorber, along with upper limits on the OH luminosity of 53 other luminous infrared galaxies at z > 0.1. The new megamasers…

astro-ph1999

Extragalactic Spectroscopy with SIRTF/IRS

B. Brandl, V. Charmandaris, K. Uchida +1

The Infrared Spectrograph (IRS) is one of the three instruments on board the Space Infrared Telescope Facility (SIRTF) to be launched in December 2001. The IRS will provide high re…

astro-ph1999

Smoke in the "Smoke Rings": ISO Observations of Dust in Collisional Ring Galaxies

P. N. Appleton, V. Charmandaris, C. Horellou +2

Collisional ring galaxies probably result from a head-on collision between a compact companion galaxy and a gas-rich disk system. We present a review of the discovery of warm dust…

astro-ph1999★ 50 cited

The Gamma Ray Pulsar Population

M. A. McLaughlin, J. M. Cordes

We apply a likelihood analysis to pulsar detections, pulsar upper limits, and diffuse background measurements from the OSSE and EGRET instruments on the Compton Gamma Ray Observato…

astro-ph1999★ 109 cited

R-Mode Oscillations and Spindown of Young Rotating Magnetic Neutron Stars

Wynn C. G. Ho, Dong Lai

Recent work has shown that a young, rapidly rotating neutron star loses angular momentum to gravitational waves generated by unstable r-mode oscillations. We study the spin evoluti…

astro-ph1999★ 23 cited

Evolution of Neutron-Star, Carbon-Oxygen White-Dwarf Binaries

G. E. Brown, C. -H. Lee, S. F. Portegies Zwart +1

At least one, but more likely two or more, eccentric neutron-star, carbon-oxygen white-dwarf binaries with an unrecycled pulsar have been observed. According to the standard scenar…

astro-ph1999★ 18 cited

Mid-Infrared Spectra of Be Stars

S. A. Rinehart, J. R. Houck, J. D. Smith

We present the first medium-resolution () mid-infrared (8-13.3\micron) spectra of 11 Be stars. A large number of lines are observed and identified in these spectra, incl…

astro-ph1999

ISO Mid-Infrared Spectra of Reflection Nebulae

K. I. Uchida, K. Sellgren, M. W. Werner +1

We present 5-15 micron imaging spectroscopy of the reflection nebulae vdB 17 (NGC 1333), vdB 59 (NGC 2068), vdB 101, vdB 111, vdB 133 and vdB 135, obtained with the infrared camera…

astro-ph1999★ 11 cited

Evolution of Black Holes in the Galaxy

G. E. Brown, C. -H. Lee, R. A. M. J. Wijers +1

In this article we consider the formation and evolution of black holes, especially those in binary stars where radiation from the matter falling on them can be seen. We consider a…

astro-ph1999★ 68 cited

HST/WFPC2 and VLT/ISAAC observations of PROPLYDS in the giant HII region NGC 3603

W. Brandner, E. K. Grebel, Y. -H. Chu +6

We report the discovery of three proplyd-like structures in the giant HII region NGC 3603. The emission nebulae are clearly resolved in narrow-band and broad-band HST/WFPC2 observa…

astro-ph1999★ 25 cited

Hypercritical Advection Dominated Accretion Flow

G. E. Brown, C. -H. Lee, H. A. Bethe

In this note we study the accretion disc that arises in hypercritical accretion of onto a neutron star while it is in common envelope evolution with a…

astro-ph1999

The Convergence Depth of the Local Peculiar Velocity Field

Daniel A. Dale, Riccardo Giovanelli

We have obtained Tully-Fisher (TF) measurements for some 3000 late-type galaxies in the field and in 76 clusters distributed throughout the sky between 10 and 200\h Mpc. The cluste…

astro-ph1999★ 21 cited

TeV Cherenkov Events as Bose-Einstein Gamma Condensations

M. Harwit, R. J. Protheroe, P. L. Biermann

The recent detection of gamma radiation from Mkn 501 at energies as high as 25 TeV suggests stringent upper bounds on the diffuse, far infrared, extragalactic radiation density. Th…

astro-ph1999★ 19 cited

Correlation Analysis of SFI Peculiar Velocities

S. Borgani, L. N. da Costa, I. Zehavi +5

We present results of a statistical analysis of the SFI catalog of peculiar velocities, a recently completed survey of spiral field galaxies with I-band Tully-Fisher distances (Hay…

astro-ph1999★ 76 cited

HST Measurements of the Expansion of NGC 6543: Parallax Distance and Nebular Evolution

D. S. Reed, B. Balick, A. R. Hajian +5

The optical expansion parallax of NGC 6543 has been detected and measured using two epochs of HST images separated by a time baseline of only three years. We have utilized three se…

astro-ph1999★ 359 cited

Rossby Wave Instability of Thin Accretion Disks -- II. Detailed Linear Theory

H. Li, J. M. Finn, R. V. E. Lovelace +1

In earlier work we identified a global, non-axisymmetric instability associated with the presence of an extreme in the radial profile of the key function ${\cal L}(r) \equiv (ΣΩ/κ^…

astro-ph1999★ 135 cited

The Metagalactic Ionizing Radiation Field at Low Redshift

J. M. Shull, D. Roberts, M. L. Giroux +2

We compute the ionizing radiation field at low redshift, arising from Seyferts, QSOs, and starburst galaxies. This calculation combines recent Seyfert luminosity functions, extrapo…

astro-ph1999★ 17 cited

Plasma and Warm Dust in the Collisional Ring Galaxy VIIZw466 from VLA and ISO Observations

P. N. Appleton, V. Charmandaris, C. Horellou +3

We present the first mid-infrared (Mid-IR) (m) and radio continuum (20,~6 and 3.6 cm) observations of the star-forming collisional ring galaxy VII Zw 466 and its…

astro-ph1999★ 92 cited

Seeking the Local Convergence Depth. V. Tully-Fisher Peculiar Velocities for 52 Abell Clusters

Daniel A. Dale, Riccardo Giovanelli, Martha P. Haynes +2

We have obtained I band Tully-Fisher (TF) measurements for 522 late-type galaxies in the fields of 52 rich Abell clusters distributed throughout the sky between 50 and 200\h Mpc. H…

astro-ph1999★ 41 cited

Seeking the Local Convergence Depth. IV. Tully-Fisher Observations of 35 Abell Clusters

Daniel A. Dale, Riccardo Giovanelli, Martha P. Haynes +2

We present Tully-Fisher observations for 35 rich Abell clusters of galaxies. Results from I band photometry and optical rotation curve work comprise the bulk of this paper. This is…

astro-ph1999★ 51 cited

Tidal Interaction between a Fluid Star and a Kerr Black Hole in Circular Orbit

Paul Wiggins, Dong Lai

We present a semi-analytic study of the equilibrium models of close binary systems containing a fluid star (mass and radius ) and a Kerr black hole (mass ) in circular…

astro-ph1999★ 13 cited

Resonant Cyclotron Radiation Transfer Model Fits to Spectra from Gamma-Ray Burst GRB870303

P. E. Freeman, D. Q. Lamb, J. C. L. Wang +5

We demonstrate that models of resonant cyclotron radiation transfer in a strong field (i.e. cyclotron scattering) can account for spectral lines seen at two epochs, denoted S1 and…