J/A+A/563/L1 NGC1333-IRAS2A CALYPSO IRAM-PdBI 1mm and 3mm maps (Maret+, 2014)
First results from the CALYPSO IRAM-PdBI survey.
I. Kinematics of the inner envelope of NGC1333-IRAS2A.
Maret S., Belloche A., Maury A.J., Gueth F., Andre P., Cabrit S.,
Codella C., Bontemps S.
<Astron. Astrophys. 563, L1 (2014)>
=2014A&A...563L...1M 2014A&A...563L...1M
ADC_Keywords: YSOs ; Infrared sources ; Millimetric/submm sources
Keywords: ISM individual objects: NGC 1333-IRAS 2A -
ISM: kinematics and dynamics - ISM: molecules - stars: formation
Abstract:
The structure and kinematics of Class 0 protostars on scales of a few
hundred AU is poorly known. Recent observations have revealed the
presence of Keplerian disks with a diameter of 150-180AU in L1527-IRS
and VLA1623A, but it is not clear if such disks are common in Class 0
protostars. Here we present high-angular-resolution observations of
two methanol lines in NGC1333-IRAS2A. We argue that these lines probe
the inner envelope, and we use them to study the kinematics of this
region. Our observations suggest the presence of a marginal velocity
gradient normal to the direction of the outflow. However, the position
velocity diagrams along the gradient direction appear inconsistent
with a Keplerian disk. Instead, we suggest that the emission
originates from the infalling and perhaps slowly rotating envelope,
around a central protostar of 0.1-0.2M☉. If a disk is present,
it is smaller than the disks of L1527-IRS and VLA1623A, perhaps
suggesting that NGC1333-IRAS2A is younger.
Description:
Observations of IRAS2A where carried out with the Plateau de Bure
Interferometer (PdBI) between November 2010 and February 2011 using
the A can C configuration of the array.
Data cubes of the CH3OH (51-42 vt=0 E1) line at 216.945600GHz
(1mm), observed using the narrow-band beckend, providing a bandwidth
of 512 channels of 39kHz (0.05km/s) each, and of the CH3OH
(10-21 vt-1 E1) line at 93.196670GHz (3mm), also observed using
the narrow-band backend, but with 256 channels of 312kHz (1.0km/s)
each.
Objects:
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RA (2000) DE Designation(s)
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03 28 55.55 +31 14 36.7 NGC1333-IRAS2A = [JCC87] IRAS 2A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 123 3 List of FITS files
fits/* . 3 Individual FITS maps
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See also:
J/ApJ/575/354 : Young stellar objects in the NGC 1333 (Getman+, 2002)
J/A+A/563/L3 : NGC1333-IRAS2A CALYPSO IRAM-PdBI SiO & SO maps (Codella+, 2014)
J/A+A/563/L2 : NGC1333-IRAS2A CALYPSO IRAM-PdBI 1mm maps (Maury+, 2014)
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- 23 F4.2 arcsec/pix Scale [0.07/0.18] Scale of the image
25- 28 I4 pix Nx [1024] Number of pixels along X-axis
29 A1 --- --- [x]
30- 33 I4 pix Ny [1024] Number of pixels along Y-axis
34 A1 --- --- [x]
35- 36 I2 --- Nz [16/32]? Number of images for data cubes
38- 61 A24 --- FileName Name of FITS file in subdirectory fits
63-125 A63 --- Title Title of the file
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Acknowledgements:
Sebastien Maret, sebastien.maret(at)obs.ujf-grenoble.fr
(End) Sebastien Maret [IPAG, Grenoble], Patricia Vannier [CDS] 10-Feb-2014