2015A&A...578A..20M


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET23:48:11

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.

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Journal keyword(s): stars: protostars - ISM: jets and outflows - ISM: molecules

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 RAFGL 490 Y*O 03 27 38.7928323987 +58 47 00.017662871           ~ 334 0
2 2MASS J05352762-0509337 Y*O 05 35 27.622 -05 09 33.78           ~ 67 0
3 LDN 1641 MoC 05 39.0 -07 00           ~ 420 0
4 [SMZ2000] L1643-S3 MMS 1 smm 05 39 55.9 -07 30 28           ~ 13 0
5 NAME LDN 1641 FIRSSE 101 Y*O 05 39 55.95 -07 30 28.0           ~ 15 0
6 NGC 2071 RNe 05 47 10 +00 18.0           ~ 604 1
7 IRAS 08448-4343 cor 08 46 33.8 -43 54 33           ~ 56 1
8 IRAS 08470-4321 cor 08 48 48.2 -43 32 25           ~ 42 0
9 NGC 7129 OpC 21 42 56 +66 06.2     11.5     ~ 230 0
10 NAME NGC 7129 FIR 2 IR 21 44 01.5 +66 03 40           ~ 81 0

    Equat.    Gal    SGal    Ecl

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2019.12.11-23:48:11

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