J/A+A/564/A21 Ammonia observations in G79.29+0.46 (Rizzo+, 2014)
Ammonia observations in the LBV nebula G79.29+0.46.
Discovery of a cold ring and some warm spots.
Rizzo J.R., Palau A., Jimenez-Esteban F.M., Henkel C.
<Astron. Astrophys. 564, A21 (2014)>
=2014A&A...564A..21R 2014A&A...564A..21R
ADC_Keywords: Nebulae ; Radio lines
Keywords: stars: massive - stars: mass-loss -
ISM: individual objects: G79.29+0.46 - ISM: molecules - ISM: structure
Abstract:
We present the results of observations of the ammonia (1,1) and (2,2)
lines in a field of 7'x7' centered in the LBV ring nebula
G79.29+0.46. The survey also includes a significant part of the IRDC
G79.3+0.3. Data have been gathered with the 100m radio telescope at
Effelsberg. Both lines have been observed simultaneously with
excellent spectral resolution. A clump of the IRDC, referred in the
paper as the SW region, is sampled every 20"; sampling is 40"
elsewhere.
Description:
For each transition, a total of 130 spectra is available. Each
spectrum has 347 channels, and a velocity coverage from -40 to
+40km/s, including all the hyperfine components. Frequency resolution
is 183kHz, equivalent to a velocity resolution of 0.23km/s.
Objects:
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RA (2000) DE Designation(s)
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20 31 42.28 +40 21 59.1 exciting star = 2MASS J20314228+4021591
20 31 42.1 +40 22 01 G79.29+0.46 = GRS G079.29 +00.46
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
splist.dat 32 130 List of spectra in NH3(1,1) and (2,2) lines
list.dat 89 2 List of fits files
fits/* . 2 Individual fits files
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Byte-by-byte Description of file: splist.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Sp [1/130] Spectrum number
6- 18 E13.7 deg oRA Offset in right ascension (1)
20- 32 E13.7 deg oDE Offset in declination (1)
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Note (1): offsets from the equatorial coordinates (J2000.0) of the exciting
star, at (20:31:42.29+40:21:59.1) (J2000)
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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- 23 I4 pix Nx Number of pixels along X-axis
24 A1 --- --- [x]
25- 27 I3 pix Ny Number of pixels along Y-axis
29- 38 F10.4 MHz nu0 Rest frequency ν0
40- 46 F7.4 MHz dnu0 [-3.17/-3.15] Lower value of frequency interval
48- 54 F7.4 MHz dnu1 [23.18/23.41] Upper value of frequency interval
56- 60 F5.2 kHz dnu [18.31] Frequency resolution
62- 72 A11 --- FileName Name of FITS file in subdirectory fits
74- 89 A16 --- Title Title and comments
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Acknowledgements:
Ricardo Rizzo, ricardo(at)cab.inta-csic.es
(End) Ricardo Rizzo [CAB, Spain], Patricia Vannier [CDS] 30-Jan-2014