Largest H II regions in M101
- 1. Radio Astronomy Laboratory, University of California, Berkeley
Description
Coordinated millimeter, infrared, and ultraviolet observations of the five brightest H II regions in M101 are presented. A CO complex has been found to be associated with NGC 5461 which is much more massive than any Milky Way counterpart. A narrow line width has been observed which suggests that the molecular complex may consist of numerous fragments with a volume filling fraction approx.10-2. NGC 5461 also shows a 10 μm and 20 μm excess which is similar to that of galaxtic H II regions. The ultraviolet observations show that the 2200 A dust feature is greatly attenuated in all of the H II regions but least of all in NGC 5461. The near-infrared flux densities and Bγ line strengths are consistent with the hypothesis that a significant fraction of the infrared emission is free-free
Additional details
Publishing Information
- Journal Title
- Astrophys. J.
- Journal Volume
- 249
- Journal Issue
- 1
- Series
- Astrophys. J.
- Journal Page Range
- 76-82
- ISSN
- 0004-637X
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 13682006
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- CARBON MONOXIDE; ENERGY SPECTRA; FLUX DENSITY; GALAXIES; HYDROGEN; H2 REGIONS; INFRARED SPECTRA; LINE WIDTHS; MASS; MOLECULES; NEBULAE; RADIATION FLUX; RADIOWAVE RADIATION; ULTRAVIOLET SPECTRA
- Descriptors DEC
- CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; COSMIC RADIO SOURCES; ELECTROMAGNETIC RADIATION; ELEMENTS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; SPECTRA