J/A+A/570/A49 APEX spectra of massive YSOs (Leurini+, 2014)
SiO excitation from dense shocks in the earliest stages of massive star
formation.
Leurini S., Codella C., Lopez-Sepulcre A., Gusdorf A., Csengeri T.,
Anderl S.
<Astron. Astrophys. 570, A49 (2014)>
=2014A&A...570A..49L 2014A&A...570A..49L
ADC_Keywords: YSOs ; Spectroscopy
Keywords: stars: formation - ISM: jets and outflows - ISM: molecules
Abstract:
Molecular outflows are a direct consequence of accretion, and
therefore they represent one of the best tracers of accretion
processes in the still poorly understood early phases of high-mass
star formation. Previous studies suggested that the SiO abundance
decreases with the evolution of a massive young stellar object
probably because of a decay of jet activity, as witnessed in low-mass
star-forming regions. We investigate the SiO excitation conditions and
its abundance in outflows from a sample of massive young stellar
objects through observations of the SiO(8-7) and CO(4-3) lines
with the APEX telescope.
Description:
We performed APEX observations in SiO(8-7) of 15 massive young stellar
objects with an angular resolution of 18 arcsec and a spectral
resolution of 2km/s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 140 15 List of FITS files
fits/* . 15 Individual FITS files
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 29 A10 "date" ObsDate Observation date
31- 33 I3 --- Nx [150] Number of measurements
35- 39 F5.1 km/s Vlsr [26/114] LSR velocity of central point
41 I1 MHz dFreq [2] Frequency resolution
43- 48 F6.1 MHz bFreq [-173.8] Lower frequency
50- 54 F5.1 MHz BFreq [171.5] Upper frequency
56 I1 Kibyte size [8] Size of the FITS file
58- 74 A17 --- FileName Name of the FITS file in subdirectory fits
76-104 A29 --- Title Title of the file
106-140 A35 --- SName Simbad name of the source
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Acknowledgements:
Silvia Leurini, sleurini(at)mpifr-bonn.mpg.de
(End) Patricia Vannier [CDS] 03-Oct-2014