J/A+A/555/A78 High-resolution IR airglow spectrum (Oliva+, 2013)
A GIANO-TNG high-resolution IR spectrum of the airglow emission.
Oliva E., Origlia L., Maiolino R., Baffa C., Biliotti V., Bruno P.,
Falcini G., Gavriousev V., Ghinassi F., Giani E., Gonzalez M., Leone F.,
Lodi M., Massi F., Montegriffo P., Mochi I., Pedani M., Rossetti E.,
Scuderi S., Sozzi M., Tozzi A., Valenti E.
<Astron. Astrophys. 555, A78 (2013)>
=2013A&A...555A..78O 2013A&A...555A..78O
ADC_Keywords: Spectroscopy ; Spectra, infrared
Keywords: line: identification - infrared: general - techniques: spectroscopic
Abstract:
A flux-calibrated high-resolution spectrum of the airglow emission is
a practical λ-calibration reference for astronomical spectral
observations. It is also useful for constraining the molecular
parameters of the OH molecule and the physical conditions in the upper
mesosphere.
We used the data collected during the first technical commissioning
of the GIANO spectrograph at the Telescopio Nazionale Galileo (TNG).
The high-resolution (R≳50000) spectrum simultaneously covers the
0.95-2.4 micron wavelength range. Relative flux calibration is
achieved by the simultaneous observation of a spectrophotometric
standard star.
We derived a list of improved positions and intensities of OH infrared
lines. The list includes Λ-split doublets, many of which are
spectrally resolved. Compared with previous works, the new results
correct errors in the wavelengths of the Q-branch transitions. The
relative fluxes of OH lines from different vibrational bands show
remarkable deviations from theoretical predictions: the {DELTA} v=3,4
lines are a factor of 2 and 4 brighter than expected. We also found
evidence of a significant fraction (1-4%) of OH molecules with
non-thermal population of high-J levels. Finally, we list wavelengths
and fluxes of 153 lines not attributable to OH. Most of these can be
associated with O2, while 37 lines in the H band are not identified.
The O2 and unidentified lines in the H band account for ~=5% of the
total airglow flux in this band.
Description:
The tables lists the OH airglow line wavelengths and relative photon
fluxes (Table 1) and the wavelengths and relative photon fluxes of
other airglow lines (Table 3), measured in the Near-Infrared with the
echelle spectrometer GIANO at the Telescopio Nazionale Galileo. The
intensities of the lines (flux) are expressed in units of
photons/cm2/s, normalised to the intensity of the brightest line (in
table1), which is set to 103.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 56 308 *OH airglow line wavelengths
table3.dat 31 153 *Non-OH airglow line wavelengths
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Note on table1.dat: Lines are grouped in pairs, one for each Λ-doublet.
Note on table3.dat: Identification based on the HITRAN database
(high-resolution transmission molecular absorption database, see
http://www.cfa.harvard.edu/hitran/)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.3 0.1nm lam.1 [9722/22750] Vacuum wavelength of
first line of the OH doublet (Å)
11- 24 A14 --- Iden1 First line identification
26- 34 F9.3 0.1nm lamb.2 [9722/22750] Vacuum wavelength of
second line of the OH doublet (Å)
36- 49 A14 --- Iden2 Second Line identification
51- 54 I4 --- Flux Relative line photon flux of the doublet
56 A1 --- q_Flux [a-c] Flux uncertainty flag, a=ok (G1)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 0.1nm lambda [12496/17280] Vacuum wavelength (Å)
11- 22 A12 --- Iden Line identification (oxygen molecule)
26- 28 I3 --- Flux Relative line photon flux
31 A1 --- q_Flux [a-c] Flux uncertainty flag, a=ok (G1)
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Global notes:
Note (G1): Flux uncertainty flag as follows:
a = well-detected line, error on relative flux within 10%
b = well-detected line but affected by problems, error on relative flux
could be much larger than 10%
c = line flux poorly defined
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Acknowledgements:
Ernesto Oliva, oliva(at)arcetri.astro.it
(End) Ernesto Oliva [INAF - Arcetri], Patricia Vannier [CDS] 26-Jun-2013