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J/AJ/154/152     CARMA 1 cm spectral line survey of Orion-KL    (Friedel+, 2017)

CARMA λ=1 cm spectral line survey of Orion-KL. Friedel D.N., Looney L.W. <Astron. J., 154, 152-152 (2017)> =2017AJ....154..152F (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region ; Spectra, millimetric/submm ; Radio lines Keywords: astrochemistry - ISM: individual objects: Orion-KL - ISM: molecules - radio lines: ISM Abstract: Orion-KL is a well-known high-mass star-forming region that has long been the target of spectral line surveys and searches for complex molecules. One spectral window where the region had never been surveyed is around wavelengths of λ=1 cm. This is an important window to observe, due to the fundamental and low energy transitions of numerous complex molecules that indicate the maximum spatial extent of the molecular species; knowing the spatial distribution of a molecule aids in determining the formation mechanism(s) of that molecule. Additionally, there are fewer transitions in this window, reducing confusion caused by blended lines that can be very problematic at shorter wavelengths (λ<3 mm). In this work, we present the first spectral line survey at λ=1 cm of the Orion-KL region. A total of 89 transitions were detected from 14 molecular species and isotopologues, and two atomic species. The observations were conducted with the Combined Array for Research in Millimeter-wave Astronomy in both interferometric and single dish modes. Description: The data were taken with the λ=1 cm receivers on the Combined Array for Research in Millimeter-wave Astronomy (CARMA) 10 and 6 m telescopes, which operated between 26.938 and 34.938 GHz in single sideband mode. CARMA was used in its C (24.3-300.0 m baselines) and D (10.2-119.0 m baselines) configurations to conduct observations in 2014 March-April and 2014 December-2015 April, respectively. The phase center for all observations was α(J2000)=05h35m14.35s and δ(J2000)=-05°22'35.0". The synthesized beam sizes are ∼7"x5" for the C configuration and ∼15"x12" for the D configuration. One arcsecond is ∼414 au at the distance of Orion-KL (Menten et al. 2007A&A...474..515M). Objects: ------------------------------------------------------ RA (ICRS) DE Designation(s) ------------------------------------------------------ 05 35 14.16 -05 22 21.5 Orion-KL = NAME Orion-KL ------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 134 8 Description of Sources in Orion-KL table3.dat 111 199 Molecular Parameters of Observed Lines
See also: J/A+A/532/A32 : HCOOCH3 map of Orion-KL (Favre+, 2011) J/A+A/559/A51 : HC3N in Orion KL (Esplugues+, 2013) J/ApJ/779/119 : HCOOCH2D detection in Orion KL (Coudert+, 2013) J/ApJ/784/L7 : CH3CH2SH detection in Orion KL (Kolesnikova+, 2014) J/ApJS/215/25 : Methyl formate (HCOOCH3) observations (Favre+, 2014) J/A+A/581/A48 : 1.3cm line survey toward Orion KL (Gong+, 2015) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Name Source name 15 A1 --- n_Name [a] Note on name (1) 17- 18 I2 h RAh ? Hour of Right Ascension (J2000) 20- 21 I2 min RAm ? Minute of Right Ascension (J2000) 23- 28 F6.3 s RAs ? Second of Right Ascension (J2000) 30 A1 --- DE- Sign of the Declination (J2000) 31- 32 I2 deg DEd ? Degree of Declination (J2000) 34- 35 I2 arcmin DEm ? Arcminute of Declination (J2000) 37- 42 F6.3 arcsec DEs ? Arcsecond of Declination (J2000) 44- 47 F4.1 km/s b_VLSR ? Local standard of rest velocity, lower value 49- 52 F4.1 km/s B_VLSR ? Local standard of rest velocity, upper value 54- 56 F3.1 km/s b_FWHM ? Full width at half maximum, lower value 58 I1 km/s B_FWHM ? Full width at half maximum, upper value 60-128 A69 --- Desc Description 130-134 A5 --- Ref Reference(s) (2)
Note (1): Note as follows: a = The Orion Bar is a very extended structure; no single coordinate set can describe its position. The structure is very large and has a wide variety of velocities, FWHM, and structure sizes. Note (2): Reference as follows: 1 = Plambeck et al. (2013ApJ...765...40P); 2 = Mundy et al. (1986ApJ...304L..51M); 3 = Eisner & Carpenter (2006ApJ...641.1162E); 4 = Widicus Weaver & Friedel (2012ApJS..201...16W); 5 = Wright et al. (1996ApJ...469..216W); 6 = Friedel & Snyder (2008ApJ...672..962F); 7 = Friedel & Widicus Weaver (2012ApJS..201...17F); 8 = This work; 9 = Goicoechea et al. (2016Natur.537..207G); 10 = O'Dell et al. (2017ApJ...837..151O).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Line [1/15] Observed line (1) 4- 28 A25 --- Quant Quantum numbers 30 A1 --- n_Quant [b] Note on Quant (2) 32- 39 F8.2 MHz RFreq [27215.57/34857.2] Rest frequency 41- 44 F4.2 MHz e_RFreq [0/0.2] Uncertainty in RFreq 46- 51 F6.1 K Eu [1.4/1691.1]? Upper state energy 53- 56 F4.1 D+2 Smu2 [0.2/99.4]? Line strength times the appropriate dipole moment Sµ2 (in Debye2) 58- 61 F4.1 arcsec Bmaj [5.7/17.2] Synthesized beam major axis θa 63- 66 F4.1 arcsec Bmin [4.2/12.2] Synthesized beam minor axis θb 67 A1 --- n_Bmin [cd] Note on Bmin (3) 69- 74 F6.3 Jy I0 [-0.11/1.77]? Fitted intensity (in Jy/beam) 76- 77 I2 Jy e_I0 [0/15]? Uncertainty in I0 78 A1 --- n_I0 [efhi] Note on I0 (4) 80- 83 F4.1 km/s VLSR [-8.1/28]? Fitted local standard of rest velocity 85- 86 I2 km/s e_VLSR [0/87]? Uncertainty in VLSR 87 A1 --- n_VLSR [g] Note on VLSR (5) 89- 92 F4.1 km/s FWHM [0.5/41.5]? Fitted full width at half maximum 94- 96 I3 km/s e_FWHM [0/119]? Uncertainty in FWHM 98-102 A5 --- Pos Position where the spectrum was taken (6) 104-107 F4.1 mJy/beam rms [6/45.4]? rms noise 109-111 A3 --- Config Array configuration the data were taken in (7)
Note (1): Observed line as follows: 1 = CH3OH; 2 = 13CH3OH; 3 = Hydrogen recombination line; 4 = Helium recombination line; 5 = H2CO; 6 = H2CS; 7 = SO; 8 = 34SO; 9 = SO2; 10 = 34SO2; 11 = NH3; 12 = CH3OCHO; 13 = CH3OCH3; 14 = CH3CH2CN; 15 = HC3N. Note (2): Note as follows: b = This transition was part of the mosaic and single dish observations. Note (3): Note as follows: c = These transitions of 13CH3OH and CH3CH2CN are blended; d = Spectral profile is too complex for a reliable fit. Note (4): Note as follows: e = Uncertainty could not be calculated; f = There could be more components, and likely are, but due to high noise, no reliable fits could be made; h = In order to obtain line fits, the ratio of the lines was fixed - as was the FWHM; i = Intensity ratios were fixed for low opacity. Note (5): Note as follows: g = Intensities are free, while VLSR and FWHM were forced to be the same for each pair. Note (6): See Figure 13 and 17 for specific meanings of the position at which the spectra of the detected H recombination lines and He recombination lines were taken, respectively. See Table 1 for other positions. If it is blank, then spectra are taken from the emission peak. Note (7): The synthesized beam sizes are ∼7"x5" for the C configuration and ∼15"x12" for the D configuration.
History: From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 15-Jun-2018
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