Philip Kaaret

VERITAS: The Very Energetic Radiation Imaging Telescope Array System

Abstract A next generation atmospheric Cherenkov observatory is described which uses the Whipple Observatory gamma-ray telescope as a prototype. An array of seven imaging telescopes will be deployed such that they will permit the maximum versatility and will give the highest sensitivity in the 50 GeV-50 TeV band (with maximum sensitivity from 100 GeV to 10 TeV). In this band critical measurements of natures most powerful accelerators will be made.The Very Energetic Radiation Imaging Telescope Array System (VERITAS) represents an important step forward in the study of extreme astrophysical processes in the universe. It combines the power of the atmospheric Cherenkov imaging technique using a large optical reflector with the power of stereoscopic observatories using arrays of separated telescopes looking at the same shower. The seven identical telescopes in VERITAS, each of aperture 10 m, will be deployed in a filled hexagonal pattern of side 80 m; each telescope will have a camera consisting of 499 pixels with a field of view of 3.5 deg VERITAS will substantially increase the catalog of very high energy (E>100GeV) gamma-ray sources and greatly improve measurements of established sources.

Chandra High-Resolution Camera observations of the luminous X-ray source in the starburst galaxy M82

We have analyzed Chandra High Resolution Camera observations of the starburst galaxy M82, concentrating on the most luminous x-ray source. We find a position for the source of

Large-Scale, Decelerating, Relativistic X-ray Jets from the Microquasar XTE J1550-564

rm R.A. = 09^h 55^m 50^s.2, decl. = +69^{circ} 40arcmin 46arcsec.7

Radio Emission from an Ultraluminous X-ray Source

(J2000) with a

X-Ray States and Radio Emission in the Black Hole Candidate XTE J1550–564

1sigma

High-resolution imaging of the He II λ4686 emission line nebula associated with the ultraluminous X-ray source in Holmberg II

radial error of

Relations between Timing Features and Colors in the X-Ray Binary 4U 0614+09

0.7arcsec

A Minisurvey of X-Ray Point Sources in Starburst and Nonstarburst Galaxies

. The accurate x-ray position shows that the luminous source is not at the dynamical centre of M82 nor coincident with any suggested radio AGN candidate. The source is highly variable between observations, which suggests that the source is a compact object and not a supernova or remnant. There is no significant short term variability within the observations. Dynamical friction and the off-center position place an upper bound of

A Chandra High Resolution Camera Observation of X-Ray Point Sources in M31

10^{5} - 10^{6} M_{odot}

CLASSIFYING X-RAY SOURCES IN EXTERNAL GALAXIES FROM X-RAY COLORS

on the mass of the object, depending on its age. The x-ray luminosity suggests a compact object mass of at least