Showing 1999 · astro-phShow all

19 papers · 2 filters

astro-ph1999★ 28 cited

Search for Pulsed TeV Gamma-ray Emission from the Crab Pulsar

R. W. Lessard, I. H. Bond, S. M. Bradbury +23

We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10 m gamma-ray telescope. The direction of the Crab pulsar was obser…

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

Ground-Based Gamma-Ray Astronomy

Michael Catanese

Ground-based gamma-ray astronomy has become an active astrophysical discipline with four confirmed sources of TeV gamma rays, two plerionic supernova remnants (SNRs) and two BL Lac…

astro-ph1999★ 20 cited

DQ Herculis in Profile: Whole Earth Telescope Observations and Smoothed Particle Hydrodynamics Simulations

M. A. Wood, the XCov 15 Team

DQ Herculis was the Summer 1997 WET northern-hemisphere primary target. The O-C phase diagram of the 71-s signal reveals out-of-eclipse phase variations resulting from the self ecl…

astro-ph1999★ 5 cited

Detection Techniques of Microsecond Gamma-Ray Bursts using Ground-Based Telescopes

F. Krennrich, S. Le Bohec, T. C. Weekes

Gamma-ray observations above 200 MeV are conventionally made by satellite-based detectors. The EGRET detector on the Compton Gamma Ray Observatory (CGRO) has provided good sensitiv…

astro-ph1999★ 143 cited

Galaxy Collisions

Curtis Struck

Theories of how galaxies, the fundamental constituents of large-scale structure, form and evolve have undergone a dramatic paradigm shift in the last few decades. Earlier views wer…

astro-ph1999★ 1 cited

VERITAS: Performance characteristics (baseline design)

V. V. Vassiliev, D. A. Carter-Lewis, A. M. Hillas +6

VERITAS is a proposed major ground-based gamma-ray observatory to be built at the Whipple Observatory in southern Arizona, USA. It will consist of an array of seven 10m imaging Che…

astro-ph1999★ 25 cited

Simple Models for Turbulent Self-Regulation in Galaxy Disks

Curtis Struck, Daniel C. Smith

We propose that turbulent heating, wave pressure and gas exchanges between different regions of disks play a dominant role in determining the preferred, quasi-equilibrium, self-sim…

astro-ph1999

The Very Energetic Radiation Imaging Telescope Array System (VERITAS)

S. M. Bradbury, I. H. Bond, A. C. Breslin +32

We give an overview of the current status and scientific goals of VERITAS, a proposed hexagonal array of seven 10 m aperture imaging Cherenkov telescopes. The selected site is Mont…

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★ 95 cited

Very High Energy Gamma-Ray Astronomy

Michael Catanese, Trevor C. Weekes

We present a review of the current status of very high energy gamma-ray astronomy. The development of the atmospheric Cherenkov imaging technique for ground-based gamma-ray astrono…

astro-ph1999

A Search for Pulsed TeV Gamma Ray Emission from the Crab Pulsar

A. M. Burdett, I. H. Bond, P. J. Boyle +28

We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10m gamma-ray telescope. The direction of the Crab pulsar was observ…

astro-ph1999★ 1 cited

Search for TeV Gamma-Rays from Shell-Type Supernova Remnants

Whipple Collaboration, R. W. Lessard, I. H. Bond +26

If cosmic rays with energies <100 TeV originate in the galaxy and are accelerated in shock waves in shell-type supernova remnants (SNRs), gamma-rays will be produced as the result…

astro-ph1999★ 7 cited

The HI and Ionized Gas Disk of the Seyfert Galaxy NGC 1144 = Arp 118: A Violently Interacting Galaxy with Peculiar Kinematics

M. A. Bransford, P. N. Appleton, C. F. McCain +1

We present observations of the distribution and kinematics of neutral and ionized gas in NGC 1144, a galaxy that forms part of the Arp 118 system. Ionized gas is present over a hug…

astro-ph1999★ 3 cited

On the gravitational stability of a compressed slab of gas in the background of weakly interacting massive particles

David Tsiklauri

Linear stability of an isothermal, pressure-bounded, self-gravitating gas slab which is gravitationally coupled with the background weakly interacting massive particles (WIMPs) is…

astro-ph1999

The Future of Cherenkov Astronomy

Michael Catanese

In the last ten years, the field of Cherenkov astronomy has become an important contributor to high energy astrophysics with the detection of eight objects at energies above 300 Ge…

astro-ph1999★ 47 cited

The Flux Variability of Markarian 501 in Very High Energy Gamma Rays

J. Quinn, I. H. Bond, P. J. Boyle +26

The BL Lacertae object Markarian 501 was identified as a source of gamma-ray emission at the Whipple Observatory in March 1995. Here we present a flux variability analysis on sever…

astro-ph1999★ 20 cited

Correlated variability of Mkn 421 at X-ray and TeV wavelengths on timescales of hours

L. Maraschi, G. Fossati, F. Tavecchio +26

Mkn 421 was observed for about two days with BeppoSAX, prior to and partly overlapping the start of a 1 week continuous exposure with ASCA in April 1998, as part of a world-wide mu…

astro-ph1999★ 6 cited

New Generation Atmospheric Cherenkov Detectors

Frank Krennrich

High energy gamma-ray astronomy has been established during the last decade through the launch of the Compton Gamma Ray Observatory (CGRO) and the success of its ground-based count…