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J/ApJ/849/139   Interstellar acetone (CH3COCH3) in 3 regions   (Zou+, 2017)

Observation and analysis of interstellar acetone in GAL 31.41+0.31, GAL 034.3+00.2, and GAL 10.47+00.03. Zou L., Widicus Weaver S.L. <Astrophys. J., 849, 139-139 (2017)> =2017ApJ...849..139Z (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region; Molecular data; Millimetric/submm sources Keywords: astrochemistry; ISM: molecules; line: identification; molecular data Abstract: We present observations of interstellar acetone (CH3COCH3) detected in broadband line surveys in the 1.3mm band from the Caltech Submillimeter Observatory (CSO). The observations were conducted toward three massive star-forming regions: GAL31.41+0.31, GAL034.3+00.2, and GAL10.47+00.03. Numerous acetone lines were detected in these three sources. The results were analyzed using the assumption of local thermodynamic equilibrium. These results rigorously confirm the previous reports of acetone detections in GAL31.41+0.31 and GAL10.47+00.03, and add a new acetone detection in GAL034.3+00.2. Source-averaged column densities for acetone were determined to be 1.1(6)x1016cm-2 for GAL31.41+0.31, 6.4(3)x1016cm-2 for GAL10.47+00.03, and 1.3(3)x1015cm-2 for GAL034.3+00.2. The rotational temperatures of acetone in these three sources range from 49 to 132K, which suggests a complicated formation mechanism for interstellar acetone. Description: Observations of the three sources were performed in the summer of 2012 with the facility 230GHz wideband receiver, used with the facility Fast Fourier Transform Spectrometer (FFTS) on the 10.4m Leighton Telescope at the Caltech Submillimeter Observatory (CSO); these observations have been described in detail by Widicus Weaver+ (2017, J/ApJS/232/3). The total spectral coverage varied with each source, but in general ranged from ∼220-265GHz. Objects: ------------------------------------------------------------------ RA (ICRS) DE Designation(s) ------------------------------------------------------------------ 18 47 34.49 -01 12 40.3 GAL31.41+0.31 = BGPS G031.414+00.307 18 53 18.54 +01 14 57.9 GAL34.3+0.2 = IRAS 18507+0110 18 08 38.4 -19 51 52 GAL10.47+0.03 = GAL 010.47+00.03 ------------------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 79 3 Observational parameters table3.dat 135 3 Beam-averaged and source-averaged fit results of acetone lines using the GOBASIC program (Rad+ 2016, J/A+A/585/A23) table4.dat 81 392 Brightest acetone lines observed in these sources
See also: J/A+A/585/A23 : GOBASIC code (Rad+, 2016) J/A+A/568/A65 : NGC 7129 FIRS 2 interferometric 1-D spectrum (Fuente+, 2014) J/A+A/532/A32 : HCOOCH3 map of Orion-KL (Favre+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Source name 17- 27 A11 "Y/M/D" Date First UT date of observation 28 A1 --- --- [-] 29- 30 I2 d Day2 Last day of observation 32- 33 I2 h RAh Hour of right ascension (J2000) 35- 36 I2 min RAm Minute of right ascension (J2000) 38- 42 F5.2 s RAs Second of right ascension (J2000) 44 A1 --- DE- Sign of declination (J2000) 45- 46 I2 deg DEd Degree of declination (J2000) 48- 49 I2 arcmin DEm Arcminute of declination (J2000) 51- 54 F4.1 arcsec DEs Arcsecond of declination (J2000) 56- 59 F4.1 km/s Vlsr [58/97] Local standard of rest velocity 61- 63 I3 K Tsys1 [175/196] Lower range of telescope system temperature 64 A1 --- --- [-] 65- 67 I3 K Tsys2 [265/344] Upper range of telescope system temperature 69- 73 F5.3 --- tau1 [0.04/0.06] Lower range of atmospheric optical at 225GHz 74 A1 --- --- [-] 75- 79 F5.3 --- tau2 [0.08/0.2] Upper range of atmospheric optical at 225GHz τ
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Source name 17- 20 I4 --- N Number of transitions included in the fit 22- 30 A9 K Eup State energy Eup/k 32- 37 F6.4 --- tau-b [0.001/0.005] Beam-averaged maximum acetone optical depth (τmax) 39- 45 E7.3 cm-2 NT-b Beam-averaged column density 47- 53 E7.3 cm-2 e_NT-b 1σ uncertainty on NT-b 55- 57 I3 K Trot-b [62/137] Beam-averaged rotational temperature 59- 60 I2 K e_Trot-b 1σ uncertainty on Trot-b 62- 65 F4.1 km/s FWHM-b Beam-averaged line width 67- 69 F3.1 km/s e_FWHM-b 1σ uncertainty on FWHM-b 70 A1 --- f_FWHM-b a: The FWHM was fixed to 10.0km/s 72- 75 F4.1 km/s dVel-b Beam-averaged velocity shift relative to the Vlsr and assumed source size θ 77- 79 F3.1 km/s e_dVel-b 1σ uncertainty on dVel-b 81- 87 A7 arcsec theta Source size θ 88 A1 --- f_theta Flag on θ (1) 90- 95 F6.4 --- tau [0.02/1.2] Source-averaged maximum acetone optical depth (τmax) 97-102 E6.2 cm-2 NT Source-averaged column density 104-109 E6.2 cm-2 e_NT 1σ uncertainty on NT 111-113 I3 K Trot [49/132] Source-averaged rotational temperature 115-116 I2 K e_Trot 1σ uncertainty on Trot 118-121 F4.1 km/s FWHM Source-averaged line width 123-125 F3.1 km/s e_FWHM 1σ uncertainty on FWHM 126 A1 --- f_FWHM a: The FWHM was fixed to 10.0km/s 128-131 F4.1 km/s dVel Source-averaged velocity shift relative to the Vlsr and assumed source size θ 133-135 F3.1 km/s e_dVel 1σ uncertainty on dVel
Note (1): Flag as follows: b = Methyl formate (HCOOCH3) size in the 1.3mm band (Calcutt+ 2014MNRAS.443.3157C). c = Acetic acid (CH3COOH) size in the 3mm band (Remijan+ 2003ApJ...590..314R) d = Acetone (CH3COCH3) size in the 860um band, measured from the image (Rolffs+ 2011A&A...536A..33R).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 11 F11.4 MHz Freq [220352.5/265017.3] Catalog frequency 13- 23 F11.4 MHz GAL31.41 [220352.3/265017] GAL 31.41+0.31 line center frequency 25- 35 F11.4 MHz GAL034.3 [220351.7/265016.3] GAL 034.3+00.2 line center frequency 37- 47 F11.4 MHz GAL10.47 [220353.2/265018.1] GAL 10.47+00.03 line center frequency 49- 56 F8.4 K Eup [40.3/600.3] Upper state energy 58- 78 A21 -- TNum Transition quantum numbers in the format J"Ka",Kc"-J'Ka',Kc'. 80- 81 A2 -- Par Transition parity label
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 15-Jun-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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