Dense molecular cloud impacted by the W28 supernova remnant

Journal Article · Wed Apr 01 04:00:00 EST 1981 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/158790· OSTI ID:6192304

Wootten, A

Molecular spectra and an infrared survey of a dense molecular cloud obscuring a part of the optical nebulosity associated with the supernova remnant W28 have been obtained. The spectra reveal a warm dense core in a region of substantial line broadening near a maximum of nonthermal radio emission from the remnant. A small (approx.2 km s/sup -1/) shift in the velocity of peak molecular emission also occurs in this region. No embedded infrared source capable of heating the cloud appears to be present. The cloud appears to have been impacted by the expanding supernova remnant. The cloud appears to be an ambient cloud only recently compressed and heated by the nearby remnant; no evidence for star formation has been found. The remarkably broad HCO/sup +/ lines found near the cloud core originate in a region of enhanced ionization in the cloud, quite possibly resulting from penetration of the cloud by energetic radiation from the remnant.

• Research Organization: Department of Astronomy, University of Texas at Austin; and Owens Valley Radio Observatory, California Institute of Technology
• OSTI ID: 6192304
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 245:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACYL RADICALS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
EMISSION
FORMYL RADICALS
INFRARED SPECTRA
INTERSTELLAR SPACE
IONIZATION
LINE BROADENING
MOLECULES
NEBULAE
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
RADICALS
RADIOWAVE RADIATION
SPACE
SPECTRA
SUPERNOVA REMNANTS