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The methanol lines and hot core of OMC2-FIR4, an intermediate-mass protostar, with Herschel-HIFI
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2010, 521, pp.id.L39. ⟨10.1051/0004-6361/201015118⟩, Astronomy and Astrophysics-A&A, 2010, 521, pp.id.L39. ⟨10.1051/0004-6361/201015118⟩, Astronomy & Astrophysics, 521, L39, Astronomy & Astrophysics, 521, pp. L39, Astronomy and Astrophysics-A&A, EDP Sciences, 2010, 521, pp.L39, Astronomy & astrophysics, 521:L39. EDP Sciences, Astronomy & Astrophysics, 521. EDP Sciences
- Publication Year :
- 2010
- Publisher :
- HAL CCSD, 2010.
-
Abstract
- In contrast with numerous studies on the physical and chemical structure of low- and high-mass protostars, much less is known about their intermediate-mass counterparts, a class of objects that could help to elucidate the mechanisms of star formation on both ends of the mass range. We present the first results from a rich HIFI spectral dataset on an intermediate-mass protostar, OMC2-FIR4, obtained in the CHESS (Chemical HErschel SurveyS of star forming regions) key programme. The more than 100 methanol lines detected between 554 and 961 GHz cover a range in upper level energy of 40 to 540 K. Our physical interpretation focusses on the hot core, but likely the cold envelope and shocked regions also play a role in reality, because an analysis of the line profiles suggests the presence of multiple emission components. An upper limit of 10^-6 is placed on the methanol abundance in the hot core, using a population diagram, large-scale source model and other considerations. This value is consistent with abundances previously seen in low-mass hot cores. Furthermore, the highest energy lines at the highest frequencies display asymmetric profiles, which may arise from infall around the hot core.<br />Comment: 2 figures, accepted for publication in the A&A Herschel-HIFI special issue
- Subjects :
- 010504 meteorology & atmospheric sciences
Astronomy
Population
FOS: Physical sciences
Astrophysics
01 natural sciences
ISM: abundances
EXPLANATION
chemistry.chemical_compound
MOLECULES
INTERSTELLAR CLOUDS
0103 physical sciences
Protostar
education
010303 astronomy & astrophysics
DIAGNOSTIC-TOOL
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Line (formation)
Envelope (waves)
QB
Physics
ISM: kinematics and dynamics
STAR-FORMING REGIONS
Range (particle radiation)
education.field_of_study
stars: formation
PACS SPECTROSCOPY
Research Programm of Institute for Mathematics, Astrophysics and Particle Physics
Star formation
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Astronomy and Astrophysics
[PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Astrophysics - Astrophysics of Galaxies
ISM: molecules
Core (optical fiber)
ENVELOPES
chemistry
Space and Planetary Science
GAS
Astrophysics of Galaxies (astro-ph.GA)
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING
ABUNDANCE
Methanol
EMISSION
Galaxy Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2010, 521, pp.id.L39. ⟨10.1051/0004-6361/201015118⟩, Astronomy and Astrophysics-A&A, 2010, 521, pp.id.L39. ⟨10.1051/0004-6361/201015118⟩, Astronomy & Astrophysics, 521, L39, Astronomy & Astrophysics, 521, pp. L39, Astronomy and Astrophysics-A&A, EDP Sciences, 2010, 521, pp.L39, Astronomy & astrophysics, 521:L39. EDP Sciences, Astronomy & Astrophysics, 521. EDP Sciences
- Accession number :
- edsair.doi.dedup.....5fc7cd09928b17f219d3b5f841e65184