2015A&A...578A..20M -
Astronomy and Astrophysics, volume 578A, 20-20 (2015/6-1)
Far-infrared CO and H2O emission in intermediate-mass protostars.
MATUSZAK M., KARSKA A., KRISTENSEN L.E., HERCZEG G.J., TYCHONIEC L., VAN KEMPEN T.A. and FUENTE A.
Abstract (from CDS):
Intermediate-mass young stellar objects (YSOs) provide a link to understanding how feedback from shocks and UV radiation scales from low- to high-mass star forming regions. Our aim is to analyze excitation of CO and H2O in deeply embedded intermediate-mass YSOs and compare it with similar studies on low-mass and high-mass YSOs. Herschel/PACS spectral maps are analyzed for six YSOs with bolometric luminosities of Lbol∼102-103L☉. The maps cover spatial scales of ∼104AU in several CO and H2O lines located in the ∼55-210µm range. Rotational diagrams of CO show two temperature components at Trot∼320K and Trot~700-800K, comparable to low- and high-mass protostars probed at similar spatial scales. The diagrams for H2O show a single component at Trot∼130K, as seen in low-mass protostars, and about 100K lower than in high-mass protostars. Since the uncertainties in Trot are on the same order as the difference between the intermediate and high-mass protostars, we cannot conclude whether the change in rotational temperature occurs at a specific luminosity or whether the change is more gradual from low- to high-mass YSOs. Molecular excitation in intermediate-mass protostars is comparable to the central 103AU of low-mass protostars and consistent within the uncertainties with the high-mass protostars probed at 3x103AU scales, suggesting similar shock conditions in all those sources.
Abstract Copyright:
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Journal keyword(s):
stars: protostars - ISM: jets and outflows - ISM: molecules
Simbad objects:
10
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