J/A+A/597/A74 FeSt 1-457 IRAM and PdBI maps (Juarez+, 2017)
A correlation between chemistry, polarization and dust properties in the
Pipe nebula starless core FeSt 1-457.
Juarez C., Girart J.M., Frau P., Palau A., Estalella R., Morata O.,
Alves F.O., Beltran M.T., Padovani, M.
<Astron. Astrophys. 597, A74 (2017)>
=2017A&A...597A..74J 2017A&A...597A..74J (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Radio lines
Keywords: stars: formation - ISM: individual objects: FeSt 1-457 nebula -
ISM: molecules - radiative transfer
Abstract:
Pre-stellar cores within molecular clouds provide the very initial
conditions in which stars are formed. FeSt 1-457 is a prototypical
starless core and the most chemically evolved among those isolated,
embedded in the most pristine part of the Pipe nebula, the bowl.
We use the IRAM 30m telescope and the PdBI to study the chemical and
physical properties of the starless core FeSt 1-457 (Core 109) in the
Pipe nebula.
We fit the hyperfine structure of the N2H+ (1-0) IRAM 30m data.
This allowed us to measure with high precision the velocity field,
line widths and opacity and derive the excitation temperature and
column density in the core. We used a modified Bonnor-Ebert sphere
model adding a temperature gradient towards the center to fit the
1.2mm continuum emission and visual extinction maps. Using this model,
we have estimated the abundances of the N2H+ and the rest of
molecular lines detected in the 30GHz wide line survey performed at
3mm with IRAM 30m using ARTIST software.
Description:
IRAM 30m (FTS correlator) and PdBI 3mm observations towards the
starless core FeSt 1-457 in the Pipe nebula. Dense core tracer
N2H+ (1-0) was observed with a better spectral resolution with the
IRAM 30m VESPA correlator (0.06km/s).
Objects:
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RA (2000) DE Designation(s)
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17 35 45 -25 33.2 FeSt 1-457 = DCld 001.6+03.8
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 117 19 List of fits files
fits/* . 19 Indifividual 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- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 --- Nz ? Number of slices for the datacube
32- 34 I3 Kibyte size Size of FITS file
36- 48 A13 --- FileName Name of FITS file, in subdirectory fits
50-117 A68 --- Title Title of the FITS file
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Acknowledgements:
Carmen Juarez, juarez(at)ice.cat
(End) Carmen Juarez [CSIC-IEEC, Spain], Patricia Vannier [CDS] 31-Oct-2016