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The Ulysses Supplement to the Granat/WATCH Catalog of Cosmic Gamma-Ray Bursts
Cline, T.; Hurley, K.; Sunyaev, R. +7 more
We present third Interplanetary Network (IPN) localization data for 56 gamma-ray bursts in the Granat/WATCH catalog that occurred between 1990 November and 1994 September. These localizations are obtained by triangulation using various combinations of spacecraft and instruments in the IPN, which consisted of Ulysses, BATSE, Pioneer Venus Orbiter, …
The Local Interstellar Medium in Puppis-Vela
Blaauw, A.; Moos, H. Warren; Sahu, M. S. +1 more
The first study of the local interstellar medium (LISM) toward Puppis-Vela (l=245deg to 275°, b=-15deg to +5°, d<200 pc) is presented in this paper. A study of the locations, sizes, and physical characteristics of local interstellar gas, i.e.``astronephography,'' is included, and relies upon the improved distance measureme…
Hubble Space Telescope Observations of the Shocks in Supernova Remnant SN 1987A
Michael, Eli
We present observations of supernova remnant SN 1987A made with the Hubble Space Telescope. The bright spot previously observed on the inner circumstellar ring by the Wide Field/Planetary Camera at a position angle ~31deg has brightened by nearly a factor of 2 in seven months. Space Telescope Imaging Spectrograph (STIS) spectra confirm …
Using Balmer Line Shapes to Diagnose Physical Conditions in Collisionless Shock Waves
Hartigan, Patrick; Raymond, John C.; Ghavamian, Parviz
When a collisionless shock propagates through a partially ionized, tenuous medium (n<=1 cm-3), the neutral atoms overrun by the shock produce Balmer line emission as they are excited by collisions in the hot postshock gas. The collisional excitation of neutral atoms and their charge exchange with hot postshock protons produces both n…