J/A+A/590/A33 Class 0 sources continuum subtracted UV-tables (Persson+, 2016)
Constraining the physical structure of the inner few 100 AU scales
of deeply embedded low-mass protostars.
Persson M.V., Harsono D., Tobin J.J., van Dishoeck E.F., Joergensen J.K.,
Murillo N., Lai S.-P.
<Astron. Astrophys. 590, A33 (2016)>
=2016A&A...590A..33P 2016A&A...590A..33P (SIMBAD/NED BibCode)
ADC_Keywords: Infrared sources ; Interferometry
Keywords: stars: formation - stars: low-mass - method: observational -
techniques: interferometric
Abstract:
The physical structure of deeply-embedded low-mass protostars
(Class 0) on scales of less than 300AU is still poorly constrained.
While molecular line observations demonstrate the presence of disks
with Keplerian rotation toward a handful of sources, others show no
hints of rotation. Determining the structure on small scales (few
100AU) is crucial for understanding the physical and chemical
evolution from cores to disks.
To determine the presence and characteristics of compact, disk-like
structures in deeply-embedded low-mass protostars. A related goal is
to investigate how the derived structure affects the determination of
gas-phase molecular abundances on hot-core scales.
Two models of the emission, a Gaussian disk intensity distribution and
a parametrized power-law disk model, are fitted to sub-arcsecond
resolution interferometric continuum observations of five Class 0
sources, including one source with a confirmed Keplerian disk. Prior
to fitting the models to the de-projected real visibilities, the
estimated envelope from an independent model and any companion source
are subtracted. For reference, a spherically symmetric single
power-law envelope is fitted to the larger scale (∼1000AU) emission
and investigated further for one of the sources on smaller scales.
Description:
This dataset contains the continuum subtracted UV-tables, in UVFITS
format written by GILDAS MAPPING for the sources NGC 1333 IRAS 2A
(203GHz), NGC 1333 IRAS 4A (335GHz), NGC 1333 IRAS 4B (203GHz), and
VLA 1623 (219GHz).
Objects:
------------------------------------------------------------------
RA (ICRS) DE Designation(s)
------------------------------------------------------------------
03 28 55.55 +31 14 36.7 NGC 1333 IRAS 2A = [JCC87] IRAS 2A
03 29 10.49 +31 13 31.0 NGC 1333 IRAS 4A = [JCC87] IRAS 4A
03 29 12.01 +31 13 08.2 NGC 1333 IRAS 4B = [JCC87] IRAS 4B
16 26 26.39 -24 24 30.9 VLA 1623 = GBS-VLA J162626.39-242430.9
------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 110 4 List od UVFITS files
fits/* . 4 Individual UVFITS files
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.4 deg RAdeg Right Ascension of center (J2000)
9- 16 F8.4 deg DEdeg Declination of center (J2000)
18- 27 A10 "date" Obs.Date Observation date
29- 39 E11.6 Hz Freq Frequency
41- 44 I4 Kibyte size Size of UVFITS file
46- 62 A17 --- FileName Name of UVFITS file, in fits subdirectory
64-110 A47 --- Title Title of the UVFITS file
--------------------------------------------------------------------------------
Acknowledgements:
Magnus Persson, magnusp(at)strw.leidenuniv.nl
(End) Patricia Vannier [CDS] 15-Mar-2016