A comparison of high resolution radio and far-infrared maps of M 17

Details A comparison of high resolution radio and far-infrared maps of M 17 A comparison of high resolution radio and far-infrared maps of M 17

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76...86w&link_type=abstract

Astronomy and Astrophysics, vol. 76, no. 1, June 1979, p. 86-91.

Astronomy and Astrophysics

Astronomy

64

Astronomical Maps, Far Infrared Radiation, Infrared Astronomy, Microwave Emission, Thermal Mapping, Astronomical Photography, H Ii Regions, High Resolution, Ionized Gases, Maxima, Optical Thickness, Radiant Flux Density, Radio Astronomy, Thermal Emission

Scientific paper

New 3.5-cm radio and 69-micron far-infrared maps of M17, both made with an angular resolution of about 1.5 arcmin, are presented. Each map has three distinct maxima. Two of the maxima on the far-IR map agree in position with the corresponding maxima on the radio map. However, the positions of the brightest peak in the radio and far-infrared maps, located in the SW part of M17, differ by 4.6 + or - 2.2 s in right ascension and +44 + or - 20 sec in declination, with the far-infrared peak lying between the radio peak and the dense molecular cloud southwest of the H II region. It is believed that the positional offset of the radio and far-infrared peak is physically significant. The origin of the far-infrared radiation appears to be thermal emission from dust at the interface of the ionized gas and molecular cloud. This interface region is probably heated by radiation from the H II region.

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