J/ApJ/900/L10 X-band data of the GOTHAM Large Project for TMC-1 (McGuire+, 2020)
Early science from GOTHAM: project overview, methods, and the detection of
interstellar propargyl cyanide (HCCCH2CN) in TMC-1.
McGuire B.A., Burkhardt A.M., Loomis R.A., Shingledecker C.N., Lee K.K.L.,
Charnley S.B., Cordiner M.A., Herbst E., Kalenskii S., Momjian E.,
Willis E.R., Xue C., Remijan A.J., McCarthy M.C.
<Astrophys. J., 900, L10 (2020)>
=2020ApJ...900L..10M 2020ApJ...900L..10M
ADC_Keywords: Molecular clouds; Radio lines; Interstellar medium
Keywords: Astrochemistry; Polycyclic aromatic hydrocarbons; Chemical abundances;
Interstellar medium; Dark interstellar clouds;
Dense interstellar clouds; Interstellar molecules
Abstract:
We present an overview of the GBT Observations of TMC-1: Hunting
Aromatic Molecules Large Program on the Green Bank Telescope. This and
a related program were launched to explore the depth and breadth of
aromatic chemistry in the interstellar medium at the earliest stages
of star formation, following our earlier detection of benzonitrile
(c-C6H5CN) in TMC-1. In this work, details of the observations, use of
archival data, and data reduction strategies are provided. Using these
observations, the interstellar detection of propargyl cyanide
(HCCCH2CN) is described, as well as the accompanying laboratory
spectroscopy. We discuss these results, and the survey project as a
whole, in the context of investigating a previously unexplored
reservoir of complex, gas-phase molecules in pre-stellar sources. A
series of companion papers describe other new astronomical detections
and analyses.
Description:
The GBT Observations of TMC-1: Hunting for Aromatic Molecules (GOTHAM)
observations presented here were carried out between 2018 February and
2019 May on the Robert C. Byrd 100m GBT in Green Bank, West Virginia
under project codes GBT18A_333 and GBT18B_007.
In addition to these new observations, we have also used the data
acquired for the original benzonitrile detection under project codes
GBT17A-164 and GBT17A-434.
For this work, and those presented in the other GOTHAM papers, we
adopt a uniform molecular hydrogen column density of
NT(H2)=1022cm-2 and a molecular hydrogen density of
n(H2)=2x104cm-3 toward the TMC-1 cyanopolyyne peak from the work
of Cernicharo+ 2018ApJ...853L..22C 2018ApJ...853L..22C
Objects:
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RA (ICRS) DE Designation(s)
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04 41 42.50 +25 41 26.8 TMC-1 = HCL 2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig1.dat 43 2600562 The GBT X-band (8.0-11.6GHz) data of the
GOTHAM Large Project
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See also:
J/A+A/546/A103 : Heiles Cloud 2 CH radio emission (Sakai+, 2012)
J/ApJS/230/7 : Spectral flux densities from 50MHz to 50GHz (Perley+, 2017)
J/A+A/636/A26 : ALMA & NOEMA cubes of 4 young protostars (Harsono+, 2020)
J/A+A/646/L1 : HDCCN discovery in space and in laboratory (Cabezas+, 2021)
J/A+A/657/A24 : HCCCHCN laboratory observations (Cabezas+, 2022)
Byte-by-byte Description of file: fig1.dat
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Bytes Format Units Label Explanations
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1- 19 F19.13 MHz Freq [7906.95/11608.05] Frequency
21- 43 E23.16 K T*A [-0.044/2.77] Atmosphere-corrected intensity
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Jan-2022