IRAS large-beam and ground-based small-beam measurements of the unidentified 11. 3- and (Ne ii) 12. 8-micron line fluxes in the starburst galaxy M82

Technical Report · Thu Jan 15 04:00:00 EST 1987

OSTI ID:6495698

LeVan, P D; Price, S D

The low-resolution-spectrometer data obtained by IRAS on M82, when compared with smaller ground-based beam 8-14 micrometer spectra, provide interesting beam-dependent ratios of the fluxes for the unidentified 11.3-micrometer emission feature, the (NeII) 12.8-micrometer fine-structure line, and the 10 micrometer continuum. Specifically, the relative strengths of the 11.3-micrometer feature and the 10-micrometer continuum are constant for the small and large beam diameters, concordant with published interpretations of both as being associated with dusty regions of thermal radiation. By contrast, the relative strength of either the 11.3 micrometer feature or 10-micrometer continuum fluxes to the (NeII) 12.8-micrometer line flux increases modestly from the smaller to the larger IRAS beam diameter. This is taken as evidence for significant amounts of warm dust above that associated with the H2 regions in the nucleus of M82.

• Research Organization: Air Force Geophysics Lab., Hanscom AFB, MA (USA)
• OSTI ID: 6495698
• Report Number(s): AD-A-178215/0/XAB; AFGL-TR-87-0087
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
FLUIDS
GALAXIES
GASES
HYDROGEN
INFRARED SPECTRA
INFRARED SPECTROMETERS
MEASURING INSTRUMENTS
NEON
NONMETALS
RADIATIONS
RARE GASES
SPECTRA
SPECTROMETERS
STARS
THERMAL RADIATION