J/A+A/590/A25 Arp 220 HCN and HCO+ data cubes (Martin+, 2016)
The unbearable opaqueness of Arp 220.
Martin S., Aalto S., Sakamoto K., Gonzalez-Alfonso E., Muller S.,
Henkel C., Garcia-Burillo S., Aladro R., Costagliola F., Harada N.,
Krips M., Martin-Pintado J., Muhle S., van der Werf P., Viti S.
<Astron. Astrophys. 590, A25 (2016)>
=2016A&A...590A..25M 2016A&A...590A..25M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Millimetric/submm sources
Keywords: galaxies: individual: Arp 220 - ISM: abundances - ISM: molecules -
galaxies: ISM - galaxies: nuclei
Abstract:
The origin of the enormous luminosities of the two opaque nuclei of
Arp 220, the prototypical ultra-luminous infrared galaxy, remains a
mystery because we lack observational tools to explore the innermost
regions around the nuclei.
We explore the potential of imaging vibrationally excited molecular
emission at high angular resolution to better understand the
morphology and physical structure of the dense gas in Arp 220 and to
gain insight into the nature of the nuclear powering sources.
The Atacama Large Millimeter/submillimeter Array (ALMA) provided
simultaneous observations of HCN, HCO+, and vibrationally excited
HCN v2=1f emission. Their J=4-3 and 3-2 transitions were observed at
a matching resolution of ∼0.5", which allows us to isolate the
emission from the two nuclei.
Description:
The observations were carried out with ALMA in its Cycle 1 as part of
a spectral line survey of Arp 220 (Martin et al., in preparation). In
this paper we report the measurements covering HCN and HCO+ in their
J=3-2 (261.152GHz and 262.794GHz) and J=4-3 (348.194GHz and
350.383GHz) transitions, as well as the corresponding v2=1
transitions of HCN.
Objects:
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RA (2000) DE Designation(s)
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15 34 57.22 +23 30 11.6 Arp 220 = IC 4553
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 143 4 List of fits datacubes
fits/* . 4 Individual fits datacubes
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See also:
J/A+A/493/481 : Maps of Arp 220 (Aalto+, 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- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 29 I2 --- Nz Number of slices
31- 53 A23 --- Obs.Date Observation date
55- 65 E11.6 Hz bFreq Lower value of frequency interval
67- 77 E11.6 Hz BFreq Upper value of frequency interval
79- 89 E11.6 Hz dFreq Frequency resolution
91- 95 I5 Kibyte size Size of FITS file
97-114 A18 --- FileName Name of FITS file, in subdirectory fits
116-143 A28 --- Title Title of the FITS file
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Acknowledgements:
Sergio Martin, smartin(at)eso.org
(End) Patricia Vannier [CDS] 31-Mar-2016