J/MNRAS/478/1442 78 Stripe82 galaxies masses (Bertemes+, 2018)
Cross-calibration of CO- versus dust-based gas masses and assessment of the
dynamical mass budget in Herschel-SDSS Stripe82 galaxies.
Bertemes C., Wuyts S., Lutz D., Forster Schreiber N.M., Genzel R.,
Minchin R.F., Mundell C.G., Rosario D., Saintonge A., Tacconi L.
<Mon. Not. R. Astron. Soc., 478, 1442-1458 (2018)>
=2018MNRAS.478.1442B 2018MNRAS.478.1442B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Carbon monoxide ; Stars, masses
Keywords: surveys - galaxies: evolution - galaxies: fundamental parameters -
galaxies: ISM - galaxies: kinematics and dynamics -
radio lines: galaxies
Abstract:
We present a cross-calibration of CO- and dust-based molecular gas
masses at z≤0.2. Our results are based on a survey with the IRAM 30-m
telescope collecting CO(1-0) measurements of 78 massive
(logM*/M☉>10) galaxies with known gas-phase metallicities and
with IR photometric coverage from Wide-field Infrared Survey
Explorer(WISE; 22um) and Herschel Spectral and Photometric Imaging
Receiver (SPIRE; 250, 350, 500um). We find a tight relation (∼0.17dex
scatter) between the gas masses inferred from CO and dust continuum
emission, with a minor systematic offset of 0.05dex. The two methods
can be brought into agreement by applying a metallicity-dependent
adjustment factor (∼0.13dex scatter). We illustrate that the observed
offset is consistent with a scenario in which dust traces not only
molecular gas but also part of the HI reservoir, residing in the
H2-dominated region of the galaxy. Observations of the CO(2-1) to
CO(1-0) line ratio for two-thirds of the sample indicate a narrow
range in excitation properties, with a median ratio of luminosities
<R21≳0.64. Finally, we find dynamical mass constraints from
spectral line profile fitting to agree well with the anticipated mass
budget enclosed within an effective radius, once all mass components
(stars, gas, and dark matter) are accounted for.
Description:
Our sample is chosen with the goal of cross-calibrating CO- and
dust-based gas masses on, first of all, the same set of galaxies, and
secondly, only galaxies with known metallicities based on strong
optical nebular lines.
To ensure that the dust method can be applied to our sample in
addition to the CO method, we rely on IR data from the Herschel
Stripe82 Survey (HerS; Viero et al., 2014ApJS..210...22V 2014ApJS..210...22V, Cat.
J/ApJS/210/22 and the Wide-field Infrared Survey Explorer (WISE;
Wright et al., 2010AJ....140.1868W 2010AJ....140.1868W, See Cat. II/311) All-Sky Release.
Our CO observations were taken with the IRAM 30-m telescope using the
Eight Mixer Receiver (EMIR) with the Wideband Line Multiple
Autocorrelator (WILMA) backend. For all targets, the redshifted
CO(1-0) line could be observed in the upper sideband of the 3mm E090
band (89-1177GH). We additionally observed the redshifted CO(2-1)
line whenever it was covered by the same frequency set-up for the 1.3
mm E230 band. This was the case for 56 out of our 78 galaxies.
Exposure times range from 6 to 108min with median value (texp)=36min,
adjusted on an object-to-object basis until a significant (>5σ)
detection was obtained.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 117 78 Directly observable quantities for our
78 Stripe82 galaxies
tableb2.dat 108 78 Derived physical quantities for our
78 Stripe82 galaxies
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See also:
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
J/ApJS/210/22 : Herschel Stripe 82 survey (HerS) first catalog (Viero+, 2014)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- ID Catalog ID (G1)
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 14 F4.1 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 26 F4.1 arcsec DEs Declination (J2000)
28- 34 F7.5 --- z Redshift
36- 41 F6.3 Jy.km/s FCO(1-0) Aperture-corrected CO(1-0) flux
43- 48 F6.4 Jy.km/s e_FCO(1-0) Aperture-corrected CO(1-0) flux error
50- 55 F6.4 --- corFCO(1-0) Aperture correction factor for the
CO(1-0) flux
57- 63 F7.3 Jy.km/s FCO(2-1) ?=-99 Aperture-corrected CO(2-1) flux
65- 72 F8.4 Jy.km/s e_FCO(2-1) ?=-99 Aperture-corrected CO(2-1) flux
error
74- 81 F8.4 --- corFCO(2-1) ?=-99 Aperture correction factor for the
CO(2-1) flux
83- 90 F8.4 --- R21 ?=-99 CO luminosity ratio
(= FCO(2-1)/FCO(1-0))
92-100 F9.5 --- e_R21 ?=-99 CO luminosity ratio
(= FCO(2-1)/FCO(1-0)) error
102-108 F7.3 Jy.km/s FHI ?=-99 HI flux received from Arecibo
110-117 F8.4 Jy.km/s e_FHI ?=-99 HI flux received from Arecibo error
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Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Catalog ID
5- 11 F7.5 --- z Redshift
13- 19 F7.4 [Msun] logMstar log of the stellar mass
21- 27 F7.4 [Msun/yr] logSFR log of the SFR
29- 33 F5.2 --- Z Metallicity Z=12+log(O/H) (1)
35- 39 F5.2 kpc Re Half-light radius (2)
41- 45 F5.2 K Tdust Dust temperature
47- 50 F4.2 [Msun] logMdust log of the dust mass
52- 56 F5.3 [Msun] e_logMdust log of the dust mass error
58- 62 F5.2 [Msun] logMgasdust log of the dust-based molecular gas mass
64- 68 F5.3 [Msun] e_logMgasdust log of the dust-based molecular gas mass
error
70- 74 F5.2 [Msun] logMgasCO log of the CO-based molecular gas mass
76- 80 F5.3 [Msun] e_logMgasCO log of the CO-based molecular gas mass
error
82- 86 F5.2 [Msun] logMdyn log of the CO-inferred dynamical mass
within Re
88- 92 F5.3 [Msun] e_logMdyn log of the CO-inferred dynamical mass
within Re error
94 I1 --- f_logMdyn [0/1] Flag on logMdyn (3)
96-100 F5.2 [Msun] logMHI Adopted HI mass (4)
102-106 F5.3 [Msun] e_logMHI Adopted HI mass error
108 I1 --- f_logMHI [0/1] Flag on logMHI (5)
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Note (1): Metallicity Z=12+log(O/H) based on the Pettini & Pagel
(2004MNRAS.348L..59P 2004MNRAS.348L..59P) O3N2 calibration.
Note (2): Half-light radius taken from Simard et al. (2011ApJS..196...11S 2011ApJS..196...11S,
Cat, J/ApJS/196/11).
Note (3): Flag on logMdyn as follows:
1 = if the inferred lMdyn may be unreliable due to low inclination
(i<25°), causing large uncertainties in the inclination correction
Note (4): Adopted HI mass inferred from 21cm observations or, the Catinella et
al. (2012A&A...544A..65C 2012A&A...544A..65C, Cat. J/A+A/544/A65) scaling relation.
Note (5): Flag on logMHI as follows:
1 = if lMHI is based on 21cm direct observations
0 = if based on the Catinella et al. (2012A&A...544A..65C 2012A&A...544A..65C,
Cat. J/A+A/544/A65) scaling relation
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Global notes:
Note (G1): IRAM target source name (IRAM Observation Logs, Cat. B/iram).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 30-Jun-2021