J/A+A/605/A61 NGC 7538 IRS1 VLA maps in CH3OH and NH3 (Beuther+, 2017)
Multiplicity and disks within the high-mass core NGC 7538 IRS 1:
Resolving cm line and continuum emission at ∼0.06"x0.05" resolution.
Beuther H., Linz H., Henning T., Feng S., Teague R.
<Astron. Astrophys. 605, A61 (2017)>
=2017A&A...605A..61B 2017A&A...605A..61B (SIMBAD/NED BibCode)
ADC_Keywords: Infrared sources ; Millimetric/submm sources ; Interferometry
Keywords: stars: formation - stars: massive - stars: individual: NGC 7538 IRS1 -
stars: rotation - instrumentation: interferometers
Abstract:
High-mass stars have a high degree of multiplicity and most likely
form via disk accretion processes. The detailed physics of the binary
and disk formation are still poorly constrained.
We seek to resolve the central substructures of the prototypical
high-mass star-forming region NGC7538IRS1 at the highest possible
spatial resolution line and continuum emission to investigate the
protostellar environment and kinematics.
Using the Karl G. Jansky Very Large Array (VLA) in its most extended
configuration at ∼24GHz has allowed us to study the NH3 and thermal
CH3OH emission and absorption as well as the cm continuum emission
at an unprecedented spatial resolution of 0.06"x0.05", corresponding
to a linear resolution of ∼150AU at a distance of 2.7kpc.
Description:
We observed NGC 7538 IRS 1 on July 21, 2015, during a four hour track
with the Karl G. Jansky Very Large Array (VLA) in its most extended
A-configuration (baselines extending out to 37 km). The proposal ID is
15A-115. With the flexible VLA correlator we covered many spectral
lines and the cm continuum emission in the radio K band. Specifically
we covered seven NH3 inversion lines, seven CH3OH lines, and two
Hα recombination lines.
Objects:
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RA (2000) DE Designation(s)
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23 13 45.32 +61 28 11.7 NAME NGC 7538 IRS 1 = MSX5C G111.5423+00.7784
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 163 17 List of fits files
fits/* . 17 Individual fits files
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See also:
J/A+A/558/A81 : NGC 7538 IRS1 maps in CH3OH, HCN and HCO+ (Beuther+, 2013)
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 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 32 I3 --- Nz ? Number of slices
34- 54 A21 --- Obs.Date ? Observaiton date (YYYY-MM-DDThh:mm:ss.s)
56- 62 F7.4 GHz bFreq Observed frequency or lower value of frequency
interval for datacubes
64- 70 F7.4 GHz BFreq ? Upper value of frequency interval
for datacubes
72- 78 F7.1 Hz dFreq ? Frequency resolution for datacubes
80- 85 I6 Kibyte size Size of FITS file
87-109 A23 --- FileName Name of FITS file, in subdirectory fits
111-163 A53 --- Title Title of the FITS file
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Acknowledgements:
Henrik Beuther, beuther(at)mpia.de
(End) Patricia Vannier [CDS] 19-May-2017