Portal de Periódicos da CAPES

Near-infrared and CO observations of W40 and W48

1978; IOP Publishing; Volume: 222; Linguagem: Inglês

10.1086/156207

1538-4357

II Zeilik M., C. J. Lada,

Atmospheric Ozone and Climate

view Abstract Citations (56) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Near-infrared and CO observations of W40 and W48. Zeilik, M., II ; Lada, C. J. Abstract Results are reported for coordinated near-IR (1.2 to 20 microns) and millimeter observations of the H II regions W40 (G28.8+3.5) and W48 (G35.2-1.7). The millimeter observations involved the J = 1-0 transitions of (C-12)O and (C-13)O in the vicinity of both sources. Intensity maps are presented which reveal three 2.2-micron emission peaks in W40, two close compact IR components in W48, a strong peak of CO emission in W40, and two CO emission peaks in W48. It is found that: (1) the measured velocities of hydrogen recombination lines differ from those of CO by about 4 km/s in both sources; (2) the difference is negative in W40 and positive in W48; (3) the velocities of carbon recombination lines fall close to those of CO for both regions; and (4) the IR sources are displaced from the peaks of CO emission. The results are shown to indicate that W40 and W48 lie at the edges of molecular clouds and also to support a hot blister model for the development of these H II regions from their associated molecular clouds. Publication: The Astrophysical Journal Pub Date: June 1978 DOI: 10.1086/156207 Bibcode: 1978ApJ...222..896Z Keywords: Carbon Monoxide; Interstellar Gas; Millimeter Waves; Near Infrared Radiation; Nebulae; Astronomical Maps; H Ii Regions; Hydrogen Ions; Hydrogen Recombinations; Infrared Astronomy; Luminous Intensity; Spectral Energy Distribution; Astrophysics; Carbon Monoxide:Molecular Clouds; H II Regions:Infrared Sources; H II Regions:Molecular Clouds full text sources ADS | data products SIMBAD (13)