Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354..549m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 354, May 10, 1990, p. 549-555.
Astronomy and Astrophysics
Astrophysics
14
Astronomical Spectroscopy, H Ii Regions, Infrared Spectroscopy, Molecular Clouds, Infrared Spectra, Interstellar Extinction, Interstellar Matter, Near Infrared Radiation, Spectrophotometry, Stellar Spectra
Scientific paper
Near-infrared spectrophotometric observations of the obscured H II region NGC 2024 are presented. The data include Br-gamma line and 3.29-micron intensity distributions in an area of about 2.5 arcmin x 1.5 arcmin, together with measurements in several positions of the Br-alpha line, the He I (2.058 micron) line, and 3.07 microns-ice-band absorption. The spectrophotometry of NGC 2024 IRS 2 is also presented. The integrated flux of the Br-gamma line in the region observed is estimated, as about 9 x 10 to the -18th W/sq cm, at least three times as large as that of IRAS 2. The Br-gamma map has a general similarity to available radio continuum maps, especially in the peak region at around 20 arcsec south of IRS 2, but farther south, Br-gamma emission seems to be heavily obscured. The 3.29-micron band emission, which is strongest at about 55 arcsec south of IRS 2, has an elongated distribution along the east-west direction. It is also shown that the extended continuum emission in near-infrared wavelengths can be interpreted by small hot grains with a typical temperature of about 1000 K. By combining these observations, the nature of exciting stars is discussed.
Maihara Toshinori
Mizutani Kohei
Suto Hiroshi
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