J/A+A/593/A37 Spectral cube toward NGC 6334 I and I(N) (van der Wiel+, 2016)
Three-dimensional distribution of hydrogen fluoride gas toward
NGC 6334 I and I(N).
van der Wiel M.H.D., Naylor D.A., Makiwa G., Satta M., Abergel A.
<Astron. Astrophys. 593, A37 (2016)>
=2016A&A...593A..37V 2016A&A...593A..37V (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Molecular clouds ; YSOs; Spectra, infrared
Keywords: ISM: molecules - ISM: clouds -
ISM: individual objects: NGC6334 I, NGC6334 I(N) - stars: formation -
circumstellar matter - astrochemistry
Abstract:
The HF molecule has been proposed as a sensitive tracer of diffuse
interstellar gas, while at higher densities its abundance could be
influenced heavily by freeze-out onto dust grains.
We investigate the spatial distribution of a collection of absorbing
gas clouds, some associated with the dense, massive star-forming core
NGC 6334 I, and others with diffuse foreground clouds elsewhere
along the line of sight. For the former category, we aim to study the
dynamical properties of the clouds in order to assess their potential
to feed the accreting protostellar cores.
We use far-infrared spectral imaging from the Herschel SPIRE iFTS to
construct a map of HF absorption at 243um in a 6'x3.5' region
surrounding NGC 6334 I and I(N).
Description:
Spectral cube derived from four individual observations with SPIRE
iFTS on the Herschel Space Observatory, containing spectra between
1132 and 1332GHz and covering the 6x3.5-arcmin sky area around the
source I and I(N) in the NGC6334 complex. Sky coordinates are in
J2000, spectral coordinates in GHz. Two 12CO rotational lines have
been fitted and subtracted, as illustrated in Fig. 2 of the
accompanying paper. The intensity axis is normalized to the continuum,
the level of which is therefore by definition unity. The shape of each
spectral line has the form of a sinc function, native to any Fourier
Transform spectrometer.
Objects:
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RA (2000) DE Designation(s)
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17 20 53.35 -35 47 01.5 NGC 6334 I = Name NGC 6334-I
17 20 54. -35 45 00. NGC 6334 I(N) = Name NGC 6334 I(N)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 133 2 List of images in the fits file
spire_hf.fit 2880 2324 Fits datacube
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See also:
J/A+A/466/989 : Hot ammonia from NGC 6334I and NGC 6334I(N) (Beuther+, 2007)
J/A+A/481/169 : ATCA 3mm obs. of NGC 6334I and NGC 6334I(N) (Beuther+, 2008)
J/ApJ/707/1 : Water and Methanol masers in NGC 6334I(N) (Brogan+, 2009)
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- 21 I2 --- Nx Number of pixels along X-axis
23- 24 I2 --- Ny Number of pixels along Y-axis
26- 28 I3 --- Nz Number of pixels along Z-axis
30- 36 F7.2 GHz bFreq ? Lower value of frequency interval
38- 44 F7.2 GHz BFreq ? Upper value of frequency interval
46- 53 F8.6 GHz dFreq ? Frequency resolution
55- 58 I4 Kibyte size Size of FITS file
60- 71 A12 --- FileName Name of FITS file
73 I1 --- Index [1/2] Index number
75-133 A59 --- Text Title of the FITS index datacube
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Acknowledgements:
Matthijs van der Wiel, matthijs(at)nbi.ku.dk
(End) M. van der Wiel [Copenhagen Univ., Denmark], P. Vannier [CDS] 31-May-2016