Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...425..707h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 425, no. 2, p. 707-719
Astronomy and Astrophysics
Astrophysics
39
H Ii Regions, Interstellar Matter, Near Infrared Radiation, Star Formation, Astronomical Observatories, Emission Spectra, H Alpha Line, Hydrogen Recombinations, Light Scattering, Molecular Clouds
Scientific paper
We present H (1.65 micron), K (2.23 micron), and Ldouble prime(3.81 micron) broad-band images as well as Br(gamma) (n = 7 approaches 4, 2.166 micron) and Br(alpha) (n = 5 approaches 4, 4.052 micron) hydrogen recombination line images, and 3.29 micron and 3.4 micron unidentified feature emission images of the Monoceros R2 star formation region at a plate scale of approximately 0.9 sec/pixel. The Brackett line images ar combined with 5 GHz data to map the line-of-sight dust extinction to the compact H II region on a small spatial scale. This extinction map is then used to deredden regions of the H and K imges interior to the H II region. IRS 1SW, the ionizing source, is found to be consistent with a B0 star. Comparison of dereddened H and K images with the Brackett images and recent high-resolution HCO(+) measurements leads to the development of a torus model for the dense molecular gas surrounding the H II region. The 3.29 micron emission is found to be coincident with the ring of scattered light at 2.2 micron and just outside the Br(alpha) and Br(gamma) emission. The 3.4 micron image is of too low a signal-to-noise ratio to determine if any variation in the 3.29 to 3.4 micron emission ratio with distance from the ionizing source is seen; however, 3.4 micron emission is detected in a ring coincident with the 3.29 micron emission.
Forrest William John
Howard Eric M.
Pipher Judith L.
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