J/A+A/597/A118 Bok globule BHR 160 radio lines spectra (Haikala+, 2017)
The Bok globule BHR 160: structure and star formation.
Haikala L.K., Reipurth B.
<Astron. Astrophys. 597, A118 (2017)>
=2017A&A...597A.118H 2017A&A...597A.118H (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Stars, pre-main sequence ; Radio lines ;
Spectroscopy
Keywords: stars: formation - stars: pre-main-sequence -
ISM: individual: BHR160 - ISM: dust, extinction
Abstract:
BHR160 is a virtually unstudied cometary globule within the Sco OB4
association in Scorpius at a distance of 1600pc. It is part of a
system of cometary clouds which face the luminous O star HD155806.
BHR160 is special because it has an intense bright rim.
We attempt to derive physical parameters for BHR160 and to understand
its structure and the origin of its peculiar bright rim.
BHR160 was mapped in the 12CO, 13CO and C18O (2-1) and (1-0) and
CS (3-2) and (2-1) lines. These data, augmented with stellar
photometry derived from the ESO VVV survey, were used to derive the
mass and distribution of molecular material in BHR160 and its
surroundings. Archival mid-infrared data from the WISE satellite was
used to find IR excess stars in the globule and its neighbourhood.
Description:
Radio spectral lines in maps covering approximately 2' by 2' with 20"
spacing and a tilt of 60 degrees of the Bok globule BHR160 are
presented. The spectra were obtained at Swedish ESO Submillimetre
Telescope (SEST) in 1999. The observed molecular lines were
12CO(1-0), 12CO(2-1), 13CO(1-0), 13CO (2-1), C18O(1-0),
C18O(2-1), CS(2-1) and CS(3-2). The SEST 2 and 3mm SESIS and 1 and
3mm IRAM dual SIS SSB receivers and the high resolution 2000 channel
AOS spectrometer (channel spacing 41.711kHz) were used. The
spectrometer was split into two to observe both channels
simultaneously. The observations were made in the frequency switch
mode. The switch was 5MHz (the 3mm channels) and 15MHz (the 1 and 2mm
channels). The calibration was obtained using the chopper wheel
method. The temperature scale of the spectra is in Ta* units, i.e.
corrected to outside of the atmosphere but not for beam coupling. The
12CO spectra have been processed to correct for the artefact produced
by the frequency switching method by the atmospheric CO and the -5km/s
component (12CO (1-0)) and the -5km/s velocity component
(12CO(2-1). The spectra are presented in 9 binary table FITS files.
Objects:
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RA (2000) DE Designation(s)
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11 14 29 -60 53.1 BHR 60 = DCld 291.4-00.2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
bhr160_1.dat 50 56 *12CO(1-0) spectra (118.258GHz) list
bhr160_2.dat 50 56 12CO(1-0) spectra (118.258GHz) list,
second order baseline subtracted after folding
bhr160_3.dat 50 56 12CO(2-1) spectra (238.512GHz) list,
second order baseline subtracted after folding
bhr160_4.dat 50 72 13CO(1-0) spectra (118.189GHz) list,
second order baseline subtracted after folding
bhr160_5.dat 50 56 13CO(2-1) spectra (228.374GHz) list,
second order baseline subtracted after folding
bhr160_6.dat 50 49 C18O(1-0) spectra (112.770GHz) list,
second order baseline subtracted after folding
bhr160_7.dat 50 49 C18O(2-1) spectra (227.535GHz) list,
second order baseline subtracted after folding
bhr160_8.dat 50 56 CS(2-1) spectra (100.970GHz) list,
second order baseline subtracted after folding
bhr160_9.dat 50 72 CS(3-2) spectra (154.952GHz) list,
second order baseline subtracted after folding
fits/* . 9 FITS files with spectra
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Note on bhr160_1.dat: second order baseline *but no folding*. The -5km/s
component (C1 component) is visible. It will be corrupted when folding the
spectra.
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Byte-by-byte Description of file: bhr160_?.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Scan Scan number
9- 19 E11.7 Hz ImgFreq Image frequency
21- 28 F8.4 km.s DV Delta V
30- 37 F8.2 d JD Julian date (JD-2400000) or MJD
39- 50 A12 --- FileName Name of the file with fits spectra in
subdirectory fits
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Acknowledgements:
Lauri Haikala, lkhaikala(at)gmail.com
(End) Lauri Haikala [Univ. Atacama], Patricia Vannier [CDS] 24-Nov-2016