Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.4210g&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #42.10; Bulletin of the American Astronomical Society, Vol. 28, p.887
Astronomy and Astrophysics
Astronomy
Scientific paper
The VLA of the NRAO and the IRCAM of the USNO were used to image the H_2O masers at a wavelength of 1.3 cm and the infrared emission at the IR J, H, and K bands in the Orion region of star formation. The IR and radio frames have been aligned to an accuracy of +/- 0.1'', and overlays of the H_2O maser and IR emission are presented. A new region of H_2O maser emission was detected nearly 2' south of IRc2, near the OMCS outflow region. The strongest H_2O masers in OMCS are distributed along a SE/NW 0.5'' line. A velocity gradient of 65 km s(-1) is found along this line. This site is identified as the most likely position of the source driving the OMCS molecular outflow. OMCS H_2O masers are found in proximity to several very reddened IR point sources. The spatial distribution of the H_2O masers toward Orion BN/KL generally agrees with previous VLBI observations. The ``shell'' H_2O masers, found toward IRc2, are distributed along a 1.5'' line. The ``shell'' masers toward IRc2 cover a velocity range of 26 km s(-1) . Although more complex than the masers toward OMCS, the velocity distribution of the IRc2 ``shell'' masers is discussed.
Gaume Ralph A.
Johnston Ken J.
Schmid-Burgk Johannes
Vrba Fred J.
Wilson Thomas L.
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