J/A+A/634/A125 NGC 1068 nucleus molecular line spectra at 2mm (Qiu+, 2020)
λ=2mm spectroscopy observations towards the circumnuclear disk of
NGC 1068.
Qiu J., Zhang J., Zhang Y., Jia L., Tang X.
<Astron. Astrophys. 634, A125 (2020)>
=2020A&A...634A.125Q 2020A&A...634A.125Q (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Spectra, millimetric/submm
Keywords: ISM: molecules - galaxies: ISM - galaxies: individual: NGC 1068 -
galaxies: nuclei - galaxies: active
Abstract:
We investigate the physical and chemical conditions of molecular gas
in the circumnuclear disk (CND) region of NGC 1068.
We carried out a spectral line survey with the IRAM 30m telescope
toward the center of NGC 1068 and mainly focused on the 2mm band with
a frequency coverage of 160.7-168.6GHz and 176.5-184.3GHz.
Fifteen lines are detected in NGC 1068, eight of which are new
detections for this galaxy. We derive the rotation temperatures and
column densities of fourteen molecular species.
Based on the [HCO+ (2-1)]/[HOC+ (2-1)] ratio, we obtain a high
ionization degree in the CND of NGC 1068. It is found that HC3N is
concentrated in the east knot, while 13CCH, CH3CN, SO, HOC+, CS,
CH3CCH, and H2CO are concentrated in the west knot. Compared to
the star-forming galaxies M 82 and NGC 253, the chemistry of NGC 1068
might be less strongly affected by the UV radiation field, and its
kinetic temperature might be lower.
Description:
We present the results of molecular line survey towards the nucleus of
the nearby AGN galaxy NGC 1068. We show the final averaged spectra
after eliminating bad scans and subtracting baselines of order 1 to
the individual spectra. Y-axis is in main beam temperature scale.
Objects:
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RA (2000) DE Designation(s)
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02 42 40.70 -00 00 48.0 NGC 1068 = M 77
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 124 4 List of fits spectra
fits/* . 4 Individual fits spectra
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See also:
J/A+A/602/A78 : NGC1068 interferometric mid-IR measurements
(Lopez-Gonzaga+, 2017)
J/A+A/613/A3 : NGC 1068 deep millimeter spectroscopy observations (Qiu+ 2018)
J/A+A/625/A100 : NGC 1068 SPHERE-VLT images (Rouan+, 2019)
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- 22 I3 --- Nx Number of pixels along X-axis
24- 46 A23 "datime" Obs.date Observation date
48- 55 F8.5 GHz bFreq Lower value of relative frequency
57- 63 F7.5 GHz BFreq Upper value of relative frequency
65- 75 E11.6 Hz dFreq Frequency resolution
77 I1 Kibyte size Size of FITS file
79- 84 A6 --- FileName Name of FITS file, in subdirectory fits
86-124 A39 --- Title Title of the FITS file
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Acknowledgements:
Jianjie Qiu, qiujianjie2007(at)126.com
(End) Patricia Vannier [CDS] 29-Jan-2020