J/A+A/499/233 IRAS 05345+3157 mm high-angular resolution maps (Fontani+, 2009)
Linking pre- and proto-stellar objects in the intermediate-/high-mass star
forming region IRAS 05345+3157.
Fontani F., Zhang Q., Caselli P., Bourke T.L.
<Astron. Astrophys. 499, 233 (2009)>
=2009A&A...499..233F 2009A&A...499..233F
ADC_Keywords: Infrared sources ; Radio lines; Spectroscopy
Keywords: stars: formation - ISM: molecules
Abstract:
To better understand the initial conditions of the high-mass star
formation process, it is crucial to study at high-angular resolution
the morphology, the kinematics, and eventually the interactions of the
coldest condensations associated with intermediate-/high-mass star
forming regions. The paper studies the cold condensations in the
intermediate-/high-mass proto-cluster IRAS 05345+3157, focusing the
attention on the interaction with the other objects in the cluster. We
have performed millimeter high-angular resolution observations, both
in the continuum and several molecular lines, with the PdBI and the
SMA. The millimeter maps reveal the presence of 3 cores inside the
interferometers primary beam, called C1-a, C1-b and C2. The lines,
specifically N2H+ and N2D+, indicate the presence of two potential
pre-stellar condensations (called N and S) not associated with the
continuum sources. C1-b is very likely associated with a newly formed
early-B ZAMS star embedded inside a hot-core, while C1-a is more
likely associated with a class 0 intermediate-mass protostar. The
nature of C2 is unclear. Both C1-a and C1-b are good candidates as
driving sources of a powerful CO outflow, strongly interacting with
both N and S, as demonstrated by the velocity gradient across both
condensations. Our major conclusion is that the chemical properties
of these pre-stellar cores are similar to those observed in low-mass
isolated ones, while the kinematics is dominated by the turbulence
triggered by the CO outflow, which can influence their evolution.
Description:
We give the interferometric image in the 96 GHz millimeter continuum
and the data-cubes of the N2H+ (1-0) line, at 93GHz, obtained towards
IRAS 05345+3157 with the PdBI. The primary beam at these frequencies
is around 48arcsec, and the angular resolution is ∼3.5arcsec in
both images.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
05 37 47.8 +31 59 24 IRAS 05345+3157 = NSV 2452
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 60 2 List of the files
fits/* . 2 FITS files
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 26 A26 --- FileName Name of the fit file in subdirectory fits
30- 60 A31 --- Title Title of the file
--------------------------------------------------------------------------------
Acknowledgements: Francesco Fontani, fontani(at)obs.unige.ch
References:
Fontani et al., Paper I 2008A&A...477L..45F 2008A&A...477L..45F
(End) Francesco Fontani [ISDC, Switzerland], Patricia Vannier [CDS] 13-Mar-2009