J/ApJS/193/17 Spectral-line survey of IRC+10216 at 293-355GHz (Patel+, 2011)
An interferometric spectral-line survey of IRC+10216 in the 345 GHz band.
Patel N.A., Young K.H., Gottlieb C.A., Thaddeus P., Wilson R.W.,
Menten K.M., Reid M.J., McCarthy M.C., Cernicharo J., He J., Brunken S.,
Trung D.-V., Keto E.
<Astrophys. J. Suppl. Ser., 193, 17 (2011)>
=2011ApJS..193...17P 2011ApJS..193...17P
ADC_Keywords: Line Profiles ; Stars, carbon ; Spectra, millimetric/submm
Keywords: astrochemistry - line: identification - stars: AGB and post-AGB -
stars: individual (IRC+10216, CW Leo) - surveys
Abstract:
We report a spectral-line survey of the extreme carbon star IRC+10216
carried out between 293.9 and 354.8GHz with the Submillimeter Array. A
total of 442 lines were detected, more than 200 for the first time;
149 are unassigned. Maps at an angular resolution of ∼3" were obtained
for each line. A substantial new population of narrow lines with an
expansion velocity of ∼4km/s (i.e., ∼30% of the terminal velocity) was
detected. Most of these are attributed to rotational transitions
within vibrationally excited states, emitted from energy levels above
the ν=0, J=0 ground state with excitation energy of 1000-3000K.
Emission from these lines appears to be centered on the star with an
angular extent of <1". We use multiple transitions detected in several
molecules to derive physical conditions in this inner envelope of
IRC+10216.
Description:
The SMA observations of IRC+10216 were done in two periods, each about
one week long. The first was 2007 January and February and the second
2009 February. All observations were made with the array in the
subcompact configuration, with baselines from 9.5m to 69.1m.
Objects:
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RA (2000) DE Designation(s)
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09 47 57.4 +13 16 44 IRC+10216 = V* CW Leo
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 153 442 Parameters of the lines detected in IRC+10216
in the Submillimeter Array (SMA) line survey
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See also:
J/ApJS/190/348 : 1mm spectral survey of IRC+10216 + VY CMa (Tenenbaum+, 2010)
J/ApJS/186/406 : 350um polarimetry from CSO (Dotson+, 2010)
J/ApJS/175/277 : Submillimeter-Continuum SCUBA detections (Di Francesco+, 2008)
J/ApJS/177/275 : 1.3 and 2mm survey of IRC+10216 (He+, 2008)
J/ApJ/688/L83 : Detection of C5N- in IRC +10216 (Cernicharo+, 2008)
J/A+AS/142/181 : 2mm molecular line survey of IRC+10 216 (Cernicharo+, 2000)
J/A+A/330/676 : IRC+10216 Silicon and sulfur chemistry (Willacy+, 1998)
J/A+A/317/503 : Photometric + visibility data of IRC +10 216 (Groenewegen,
1997)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Index number
5- 15 A11 --- Species Species identification (1)
17- 40 A24 --- Vib Vibrational state (1)
42- 64 A23 --- Trans Transition (2)
66- 73 F8.1 MHz nuObs Observed frequency
75- 78 F4.1 MHz e_nuObs Uncertainty in nuObs
80- 87 F8.1 MHz nuCat ? Cataloged frequency (3)
89- 93 F5.1 MHz Delnu ? Difference between nuObs and nuCat
95- 99 F5.2 km/s Vexp ? Expansion velocity
101-105 F5.2 km/s e_Vexp ? Uncertainty in Vexp
107-114 F8.3 Jy Peak ? Peak flux density at observed frequency
116-122 F7.3 Jy e_Peak ? Uncertainty in Peak
124-131 F8.2 Jy.km/s Iint ? Integrated intensity
133-139 F7.3 arcsec thetax ? De-convolved source size along X
141-146 F6.3 arcsec thetay ? De-convolved source size along Y
148-153 F6.2 deg PA [-90/90]? De-convolved source position angle
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Note (1): The designation of the quantum numbers follow standard
spectroscopic convention. The vibrational states of HCN are designated
by the number of quanta in the (v1, v2, and v3) modes, and the
vibrational angular momentum l in the v2 bending vibration.
The symmetry of the l-type doublet is denoted by e and f.
When e and f are not specified, both states are considered.
Similarly, the vibrational states of HC3N are labeled by
v4,v5,v6, and v7, and the vibrational angular momentum as
l=l5,l6,l7X, where X=e or f as in HCN.
Note (2): The rotational quantum numbers, with the upper level denoted
first (i.e., Jupper-Jlower). The rotational levels of symmetric
tops (e.g., CH3CN) are designated by J(K), asymmetric tops (e.g.,
SiCC) by J(Ka,Kc), and those with electron spin (e.g., SiN) by N,J.
Note (3): We referred to the following spectral-line catalogs: Cologne
Database for Molecular Spectroscopy (CDMS; see Muller et al.
2001A&A...370L..49M 2001A&A...370L..49M, 2005JMoSt.742..215M 2005JMoSt.742..215M), Molecular Spectroscopy
database of Jet Propulsion Laboratory (JPL; see Pickett et al.
1998JQSRT..60..883P 1998JQSRT..60..883P), and the online Lovas line list (Lovas
2004JPCRD..33..177L 2004JPCRD..33..177L). We used the Web site http://www.splatalogue.net,
which provides a convenient interface to these line catalogs (Remijan
et al. 2010AAS...21547905R). In addition to the published line
catalogs, we have also referred to a line catalog developed at the
IRAM 30m telescope (J. Cernicharo et al. 2000, private communication).
See section 4 for further details.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Apr-2011