A double system of ionized jets in IRAS 20126+4104

Citation
P. Hofner et al., A double system of ionized jets in IRAS 20126+4104, ASTRON ASTR, 345(3), 1999, pp. L43-L46
Citations number
15
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
00046361 → ACNP
Volume
345
Issue
3
Year of publication
1999
Pages
L43 - L46
Database
ISI
SICI code
0004-6361(199905)345:3<L43:ADSOIJ>2.0.ZU;2-#
Abstract
We have imaged the 7 mm and 3.6 cm continuum emission from the high mass (p roto)star system IRAS 20126+4104 with the VLA. The 7 mm emission appears un resolved with a synthesized beam of 1." 7 x 1." 0, and comparison with 3 mm and 1.3 mm fluxes indicates a spectral index of about 3, so that emission from dust with an absorption coefficient proportional to nu is suggested. The 3.6 cm emission consists of two elongated structures of approximate siz e 0." 8 x less than or equal to 0." 2, the northern source being coincident with the millimeter emission. The position angle of both sources is identi cal to the large scale molecular outflow seen in HCO+(1-0). We discuss explanations for the origin of the 3.6 cm continuum emission and although a cluster of three ultracompact HII regions provides a feasible m odel, we favor the interpretation of thermal ionized jets, based on the mor phology of the emission, the velocity distribution of water masers coincide nt with the northern source, and the CH3CN emission which is oriented perpe ndicular to the 3.6 cm continuum emission. In this case the measured fluxes are consistent with ionization caused by either shocks or stellar UV photo ns.