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19922026
Showing 2002 · astro-phShow all

15 papers · 2 filters

astro-ph2002★ 46 cited

Temperature Variations from HST Spectroscopy of the Orion Nebula

R. H. Rubin, P. G. Martin, R. J. Dufour +5

We present HST/STIS long-slit spectroscopy of NGC 1976. Our goal is to measure the intrinsic line ratio [O III] 4364/5008 and thereby evaluate the electron temperature (T_e) and th…

astro-ph2002★ 3 cited

The LXeGRIT Compton Telescope Prototype: Current Status and Future Prospects

E. Aprile, A. Curioni, K. L. Giboni +7

LXeGRIT is the first prototype of a novel concept of Compton telescope, based on the complete 3-dimensional reconstruction of the sequence of interactions of individual gamma rays…

astro-ph2002★ 2 cited

On the Background Rate in the LXeGRIT Instrument during the 2000 Balloon Flight

A. Curioni, E. Aprile, K. L. Giboni +7

LXeGRIT is the first prototype of a novel Compton telescope for MeV gamma-ray astrophysics based on a Liquid Xenon Time Projection Chamber (LXeTPC), sensitive in the energy band of…

astro-ph2002

BL Lacertae: the multiwavelength campaign of 2000

M. Ravasio, G. Tagliaferri, G. Ghisellini +9

We present two BeppoSAX observations of BL Lacertae as part of a multiwavelength radio-to-TeV campaign. During the first observation we observe a faint Compton spectrum, while duri…

astro-ph2002★ 190 cited

A Spectroscopic Survey of Subarcsecond Binaries in the Taurus-Auriga Dark Cloud with the Hubble Space Telescope

Patrick Hartigan, Scott Kenyon

We report the results of a spectroscopic survey of 20 close T Tauri binaries in the Taurus-Auriga dark cloud where the separations between primaries and their secondaries are less…

astro-ph2002★ 179 cited

X-Ray Spectral Variability Signatures of Flares in BL Lac Objects

M. Boettcher, J. Chiang

We are presenting a detailed parameter study of the time-dependent electron injection and kinematics and the self-consistent radiation transport in jets of intermediate and low-fre…

astro-ph2002★ 35 cited

Predictions of the High-Energy Emission from BL Lac objects: The Case of W Comae

M. Boettcher, R. Mukherjee, A. Reimer

Spectral fitting of the radio through hard X-ray emission of BL Lac objects has previously been used to predict their level of high-energy (GeV - TeV) emission. In this paper, we p…

astro-ph2002★ 41 cited

XENON: a 1 tonne Liquid Xenon Experiment for a Sensitive Dark Matter Search

E. Aprile, E. A. Baltz, A. Curioni +9

XENON is a novel liquid xenon experiment concept for a sensitive dark matter search using a 1-tonne active target, distributed in an array of ten independent time projection chambe…

astro-ph2002★ 39 cited

SCUBA observations of the host galaxies of four dark gamma-ray bursts

V. E. Barnard, A. W. Blain, N. R. Tanvir +7

We present the results of a search for submillimetre-luminous host galaxies of optically dark gamma-ray bursts (GRBs) using the Submillimetre Common-User Bolometer Array (SCUBA) on…

astro-ph2002★ 60 cited

Conversion of relativistic pair energy into radiation in the jets of active galactic nuclei

R. Schlickeiser, R. Vainio, M. Boettcher +3

It is generally accepted that relativistic jet outflows power the nonthermal emission from active galactic nuclei (AGN). The composition of these jets -- leptonic versus hadronic -…

astro-ph2002★ 59 cited

The Connection Between Spectral Evolution and GRB Lag

D. Kocevski, E. P. Liang

The observed delay in the arrival times between high and low energy photons in gamma-ray bursts (GRBs) has been shown by Norris et al. to be correlated to the absolute luminosity o…

astro-ph2002★ 77 cited

New Tests of Magnetospheric Accretion in T Tauri Stars

Christopher M. Johns-Krull, April D. Gafford

We examine 3 analytic theories of magnetospheric accretion onto classical T Tauri stars under the assumption that the magnetic field strength does not vary appreciably from star to…

astro-ph2002★ 43 cited

Temperature Variations from HST Imagery and Spectroscopy of NGC 7009

R. H. Rubin, N. J. Bhatt, R. J. Dufour +8

We present new HST/WFPC2 imagery and STIS long-slit spectroscopy of the planetary nebula NGC 7009. The primary goal was to obtain high spatial resolution of the intrinsic line rati…

astro-ph2002★ 24 cited

Hubble Space Telescope Imaging of the Post-Starburst Quasar UN 1025-0040: Evidence for Recent Star Formation

Michael S. Brotherton, Matthew Grabelsky, Gabriela Canalizo +5

We present new Hubble Space Telescope (HST) WFPC2 images of the post-starburst quasar UN J1025-0040, which contains both an active galactic nucleus (AGN) and a 400-Myr-old nuclear…

astro-ph2002★ 217 cited

The FUV spectrum of TW Hya. I. Observations of H Fluorescence

Gregory J. Herczeg, Jeffrey L. Linsky, Jeff A. Valenti +2

We observed the classical T Tauri star TW Hya with \textit{HST}/STIS using the E140M grating, from 1150--1700 Å, with the E230M grating, from 2200--2900 Å, and with \FUSE from 900-…