J/A+A/628/A71 CO spectra of 55 LIRGs and ULIRGs (Herrero-Illana+, 2019)
Molecular gas and dust properties of galaxies from the Great Observatories
All-sky LIRG Survey.
Herrero-Illana R., Privon G.C., Evans A.S., Diaz-Santos T.,
Perez-Torres M.A., U V., Alberdi A., Iwasawa K., Armus L., Aalto S.,
Mazzarella J., Chu J., Sanders D.B., Barcos-Munoz L., Charmandaris V.,
Linden S.T., Yoon I., Frayer D.T., Inami H., Kim D.-C., Borish H.J.,
Conway J., J Murphy E., Song Y., Stierwalt S., Surace J.
<Astron. Astrophys. 628, A71 (2019)>
=2019A&A...628A..71H 2019A&A...628A..71H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Spectra, millimetric/submm ; Carbon monoxide
Keywords: ISM: molecules - galaxies: ISM - galaxies: active -
galaxies: starburst - radio lines: galaxies
Abstract:
We present IRAM-30m Telescope 12CO and 13CO observations of a
sample of 55 luminous and ultraluminous infrared galaxies (LIRGs and
ULIRGs) in the local universe. This sample is a subset of the Great
Observatory All-Sky LIRG Survey (GOALS), for which we use ancillary
multi-wavelength data to better understand their interstellar medium
and star formation properties. Fifty-three (96%) of the galaxies are
detected in 12CO, and 29 (52%) are also detected in 13CO above a
3σ level. The median full width at zero intensity (FWZI)
velocity of the CO line emission is 661km/s, and 54% of the galaxies
show a multi-peak CO profile. Herschel photometric data is used to
construct the far-IR spectral energy distribution of each galaxy,
which are fit with a modified blackbody model that allows us to derive
dust temperatures and masses, and infrared luminosities. We make the
assumption that the gas-to-dust mass ratio of (U)LIRGs is comparable
to local spiral galaxies with a similar stellar mass (i.e., gas/dust
of mergers is comparable to their progenitors) to derive a CO-to-H2
conversion factor of <α≥1.8+1.30.8M☉/(K.km/s/pc2);
such a value is comparable to that derived for (U)LIRGs based on
dynamical mass arguments. We derive gas depletion times of 400-600Myr
for the (U)LIRGs, compared to the 1.3Gyr for local spiral galaxies.
Finally, we re-examine the relationship between the 12CO/13CO
ratio and dust temperature, confirming a transition to elevated ratios
in warmer systems.
Description:
Reduced 12CO and 13CO spectra observed with the IRAM-30m telescope
for all LIRGS and ULIRGs in the studied GOALS sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 63 55 Source list
sp/* . 108 Individual spectra
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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- 23 A23 --- Source Source name
25 A1 --- n_Source [12] Note on Source (1)
27- 28 I2 h RAh Right ascension (J2000) (2)
30- 31 I2 min RAm Right ascension (J2000) (2)
33- 37 F5.2 s RAs Right ascension (J2000) (2)
39 A1 --- DE- Declination sign (J2000) (2)
40- 41 I2 deg DEd Declination (J2000) (2)
43- 44 I2 arcmin DEm Declination (J2000) (2)
46- 50 F5.2 arcsec DEs Declination (J2000) (2)
52- 56 F5.2 [Lsun] log(LIR) Infrared luminosity
57 A1 --- n_log(LIR) [+] Note on log(LIR) (3)
59- 63 A5 --- SName Short name used for the spectrum files (4)
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Note (1): Note on Source as follows:
1 = Southwest component of CGCG 011-076
2 = Southwest component of NGC 7591
Note (2): Coordinates refer to the pointing position of our observations.
Note (3): Note on infrared luminosity as follows:
+ = Component of a system. In these cases, the shown LIR refers to
the whole system.
Note (4): spectrum files named SName_12 for 12CO and SName_13 for 13CO.
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 11 F11.4 km/s Vel Velocity
16- 26 E11.5 K Tmb Main beam temperature
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Acknowledgements:
Ruben Herrero-Illana, rherrero(at)eso.org
(End) Ruben Herrero-Illana [ESO, Chile], Patricia Vannier [CDS] 24-Jul-2019