J/other/NatAs/2.778 Hyperfine rotational transitions of 26Al19F (Kaminski+ 2018)
Astronomical detection of a radioactive molecule 26AlF in a remnant of
an ancient explosion.
Kaminski T., Tylenda R., Menten K.M., Karakas A., Winters J.M.,
Breier A.A., Wong K.T., Giesen T.F., Patel N.A.
<Nature Astronomy, 2, 778-783 (2018)>
=2018NatAs...2..778K 2018NatAs...2..778K (SIMBAD/NED BibCode)
ADC_Keywords: Spectra, millimetric/submm; Spectroscopy
Abstract:
Decades ago, γ-ray observatories identified diffuse Galactic
emission at 1.809MeV originating from β+ decays of an isotope
of aluminium, 26Al, that has a mean lifetime of 1.04 million
years. Objects responsible for the production of this radioactive
isotope have never been directly identified owing to insufficient
angular resolutions and sensitivities of the γ-ray
observatories. Here, we report observations of millimetre-wave
rotational lines of the isotopologue of aluminium monofluoride that
contains the radioactive isotope (26AlF). The emission is observed
towards CK Vul, which is thought to be a remnant of a stellar merger.
Our constraints on the production of 26Al, combined with the
estimates on the merger rate, make it unlikely that objects similar to
CK Vul are major producers of Galactic 26Al. However, the
observation may be a stepping stone for unambiguous identification of
other Galactic sources of 26Al. Moreover, a high content of 26Al
in the remnant indicates that, before the merger, the CK Vul system
contained at least one solar-mass star that evolved to the red giant
branch.
Description:
A list of hyperfine rotational transitions of 26Al19F up to
1.8THz. Positional uncertainties are indicated.
Calculated rotational transitions of 26Al19F up to 1.8THz
including the hyperfine structure of the molecule. The table is given
in the pgopher output format - see
http://pgopher.chm.bris.ac.uk/Help/linformat.htm for a full column
description. The table includes estimated 1 sigma errors in the
positions of the hyperfine components. These 26Al19F spectroscopic
data were used for a first astronomical detection of this molecule in
CK Vulpeculae. Data were calculated by Alexander A. Breier (Uni.
Kassel). See the publication for details.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
linelist.dat 131 1433 *List of hyperfine rotational transitions of
26Al19F up to 1.8THz
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Note on linelist.dat: The original pgopher format was preserved in this table.
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Byte-by-byte Description of file (#): linelist.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Molecule Molecule designation (Molecule)
9- 14 A6 --- M1 Mainfold of upper state (Mprime)
18- 19 I2 --- J1 Total angular momentum of upper state (Jprime)
21- 22 I2 --- S1 Symmetry of upper state (Sprime)
25 I1 --- N1 Eigenvalue number for upper state (#prime)
27- 32 A6 --- M2 Mainfold of lower state (Mbis)
35- 36 I2 --- J2 Total angular momentum of lower state (Jbis)
38- 39 I2 --- S2 Symmetry of lower state (Sbis)
42 I1 --- N2 Eigenvalue number for lower state (#bis)
44- 54 F11.3 MHz Position Frequency of the component in MHz (Position)
57- 63 F7.3 MHz StdDev One standard deviation uncertainty in
frequency (StdDev)
65 A1 --- --- [-]
67- 73 F7.5 --- Strength Spectroscopic strength of the component
(Strength)
75- 81 F7.5 --- Width [0] Component width (all set to zero) (Width)
82-131 A50 --- deltaJ Transition quantum numbers (deltaJ) (1)
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Note (1): if the eigenvalue numbers given above are ≥1 and the symmetries are
not -1, then the rest of line is taken as a comment. If either or both
eigenvalue numbers are 0, or symmetries are <0 then the comment should contain
a string of the form:
: upper state quantum numbers - lower state quantum numbers
where the quantum numbers are in the format output by PGOPHER in line
listings, and thus depend on the molecule type. The eigenvalue number and
or symmetry will be worked out from this field.
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Acknowledgements:
Alexander A. Breier, a.breier(at)physik.uni-kassel.de
Tomasz Kaminski, tkaminsk(at)cfa.harvard.edu
(End) Patricia Vannier [CDS] 26-Jun-2018