J/A+A/475/549 AFGL 2591 maps in CS, SO and HCN lines (Benz+, 2007)
Energetic radiation and the sulfur chemistry of protostellar envelopes:
submillimeter interferometry of AFGL 2591.
Benz A.O., Stauber P., Bourke T.L., van det Tak F.F.S., van Dishoeck E.F.,
Jorgensen J.K.
<Astron. Astrophys. 475, 549 (2007)>
=2007A&A...475..549B 2007A&A...475..549B
ADC_Keywords: YSOs ; Millimetric/submm sources ; Radio lines
Keywords: accretion, accretion disks - stars: formation - submillimeter -
astrochemistry - ISM: molecules - X-rays: ISM
Abstract:
The chemistry in the inner few thousand AU of accreting envelopes
around young stellar objects is predicted to vary greatly with far-UV
and X-ray irradiation by the central star.
We search for molecular tracers of high-energy irradiation by the
protostar in the hot inner envelope.
The Submillimeter Array (SMA) has observed the high-mass star forming
region AFGL 2591 in lines of CS, SO, HCN, HCN(nu2=1), and HC15N with
0.6" resolution at 350GHz probing radial scales of 600-3500AU for an
assumed distance of 1kpc. The SMA observations are compared with the
predictions of a chemical model fitted to previous single-dish
observations.
Objects:
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RA (2000) DE Designation(s)
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20 29 25 +40 11.4 AFGL 2591 = IRAS 20275+4001
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 124 5 Observed molecules and properties in the area
defined by the SMA synthesized beam centered on
the maximum position of the map
fits/* . 5 FITS files
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Mol Molecule
9- 18 A10 --- Trans Transition
20- 27 F8.4 GHz Freq Frequency
29- 35 F7.2 K Eu Upper state energy
37- 44 E8.3 s-1 Aij Transition probability
46- 48 F3.1 Jy Peak Peak brightness, in Jy/beam (1)
50- 52 F3.1 km/s WSMA SMA line width (2)
54- 55 F2.1 km/s e_WSMA rms uncertainty on WSMA
57- 60 F4.2 km/s WJCMT JCMT line width (2)
62- 65 F4.1 km/s Vlsr LSR velocity
67- 68 F2.1 km/s e_Vlsr rms uncertainty on Vlsr
70- 74 F5.2 arcsec ORA Offet in right ascension (3)
76- 78 F3.2 arcsec e_ORA rms uncertainty on ORA
80- 84 F5.2 arcsec ODE Offset in declination (3)
86- 88 F3.2 arcsec e_ODE rms uncertainty on ODE
90- 92 F3.1 arcsec FWHMa FWHM size of major axis
94- 95 F2.1 arcsec e_FWHMa rms uncertainty on FWHMa
97- 99 F3.1 arcsec FWHMb FWHM size of minor axis
101-102 F2.1 arcsec e_FWHMb rms uncertainty on FWHMb
104-124 A21 --- FileName Name of the map FITS file,
in "fits" subdirectory (4)
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Note (1): Peak brightness of synthesized beam at position of peak continuum,
using a Gaussian fit in velocity.
Note (2): Width of Gaussian line shape fitted in velocity.
Note (3): Positional offset of the main peak from the continuum peak.
Note (4): Most of the maps are 257x257x70 with an angular resolution
of 0.1arcsec and a spectral resolution of 1km/s.
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Acknowledgements:
Arnold Benz, benz(at)astro.phys.ethz.ch
(End) Patricia Vannier [CDS] 27-Sep-2007