J/A+A/692/A125 Molecular gas in void galaxies (Rodriguez+, 2024)
CO-CAVITY project: Molecular gas and star formation in void galaxies.
Rodriguez M.I., Lisenfeld U., Duarte-Puertas S., Espada D.,
Dominguez-Gomez J., Sanchez-Portal M., Bongiovanni A., Alcazar-Laynez M.,
Argudo-Fernandez M., Bidaran B., De Daniloff S.B., Falcon-Barroso J.,
Florido E., Garcia-Benito R., Jimenez A., Kreckel K., Peletier R.F.,
Perez I., Ruiz-Lara T., Sanchez-Menguiano L., Torres-Rios G.,
Villalba-Gonzalez P., Verley S., Zurita A.
<Astron. Astrophys. 692, A125 (2024)>
=2024A&A...692A.125R 2024A&A...692A.125R (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Galaxies ; Carbon monoxide ; Radio lines
Keywords: galaxies: formation - galaxies: general - galaxies: ISM -
galaxies: structure
Abstract:
Cosmic voids, distinguished by their low-density environment, provide
a unique opportunity to explore the interplay between the cosmic
environment and the processes of galaxy formation and evolution. Data
on the molecular gas has been scarce so far. In this paper, we
continue previous research done in the CO-CAVITY pilot project to
study the molecular gas content and properties in void galaxies to
search for possible differences compared to galaxies that inhabit
denser structures. We observed at the IRAM 30m telescope the CO(1-0)
and CO(2-1) emission of 106 void galaxies selected from the CAVITY
survey. Together with data from the literature, we obtained a sample
of 200 void galaxies with CO data. We conducted a comprehensive
comparison of the specific star formation rate (sSFR=SFR/M*), the
molecular gas fraction (MH2/M*), and the star formation
efficiency (SFE=SFR/MH2) between the void galaxies and a
comparison sample of galaxies in filaments and walls, selected from
the xCOLD GASS survey. We found no statistically significant
difference between void galaxies and the comparison sample in the
molecular gas fraction as a function of stellar mass for galaxies on
the star-forming main sequence (SFMS). However, for void galaxies, the
SFE was found to be constant across all stellar mass bins, while there
is a decreasing trend with M* for the comparison sample. Finally,
we found some indications for a smaller dynamical range in the
molecular gas fraction as a function of distance to the SFMS in void
galaxies. Overall, our analysis finds that the molecular gas
properties of void galaxies are not very different from denser
environments. The physical origin of the most significant difference
that we found - a constant SFE as a function of stellar mass in void
galaxies - is unclear and requires further investigation and
higher-resolution data.
Description:
We carried out a CO spectroscopic survey of a sample of 106 CAVITY
galaxies with the IRAM 30m telescope at Pico Veleta (Spain) to observe
the 12CO(1-0) and in parallel 12CO(2-1) line emission. The
corresponding rest frequencies are 115.271GHz and 230.538 GHz for
CO(1-0) and CO(2-1), respectively. The observations were carried out
between December 2021 and February 2023, within the projects 170-21,
083-22, and 164-22.
We present new data of the CO(1-0) and CO(2-1) line emission observed
with the IRAM 30m IRAM telescope for a sample of 106 galaxies
belonging to the CAVITY project (Perez et al., 2024A&A...689A.213P 2024A&A...689A.213P).
For CO(1-0), we recorded 64 detections, 9 tentative detections, and 33
non-detections, while for CO(2-1), we obtained 63 detections, 8
tentative detections, and 35 non-detections. In addition to the 106
CAVITY galaxies, we included a sample of 16 CO-VGS galaxies that were
previously observed using the IRAM 30m telescope (Dominguez-Gomez et
al., 2022A&A...658A.124D 2022A&A...658A.124D, Cat. J/A+A/658/A124), and 89 xCOLD GASS void
galaxies. Finally, we exclude 11 galaxies classified as AGN, and thus
the final CO-VG sample is composed of 200 galaxies.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 54 106 Properties for the IRAM-30m CO-CAVITY galaxies
table2.dat 66 106 CO emission line intensities for the
IRAM-30m CO-CAVITY
table3.dat 71 200 LCO luminosity, co-factor conversion, molecular
gas mass, and aperture correction factor for
the CO-VG sample
table4.dat 40 200 Properties for the CO-VG sample
--------------------------------------------------------------------------------
See also:
J/AJ/144/16 : Optical & HI properties of galaxies in voids (Kreckel+, 2012)
J/A+A/658/A124 : CO-CAVITY pilot survey. CO spectra (Dominguez-Gomez+, 2022)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- CAVITY Catalogue ID in the CAVITY sample
8- 9 I2 h RAh Right ascension (J2000.0)
11- 12 I2 min RAm Right ascension (J2000.0)
14- 18 F5.2 s RAs Right ascension (J2000.0)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000.0)
25- 26 I2 arcmin DEm Declination (J2000.0)
28- 31 F4.1 arcsec DEs Declination (J2000.0)
34- 39 F6.4 --- zSDSS Redshift (from SDSS DR7)
42- 47 F6.2 Mpc DL Luminosity distance
51- 54 F4.1 arcsec R90r The r-Petrosian radius R90,r (from SDSSDR7)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- CAVITY Catalogue ID in the CAVITY sample
7 A1 --- l_ICO(1-0) Upper-limit flag on ICO(1-0)
9- 12 F4.2 K.km/s ICO(1-0) Velocity-integrated intensity for ICO(1-0)
15- 18 F4.2 K.km/s e_ICO(1-0) ? Error on ICO(1-0)
21- 24 F4.2 mK rmsICO(1-0) RMS noise around the CO(1-0) line
at 20km/s
27- 30 F4.1 --- S/NICO(1-0) ?=- Signal-to-noise ratio for
the CO(1-0) line
34- 36 I3 km/s LWCO(1-0) Zero-level line widths for the CO(1-0) line
38 A1 --- l_ICO(2-1) Upper-limit flag on ICO(2-1)
40- 44 F5.2 K.km/s ICO(2-1) Velocity-integrated intensity for ICO(2-1)
46- 49 F4.2 K.km/s e_ICO(2-1) ? Error on ICO(2-1)
52- 56 F5.2 mK rmsICO(2-1) RMS noise around the CO(2-1) line
at 20km/s
58- 61 F4.1 --- S/NICO(2-1) ?=- Signal-to-noise ratio for
the CO(2-1) line
64- 66 I3 km/s LWCO(2-1) Zero-level line widths for the CO(2-1) line
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- CAVITY Catalogue ID in the CO-VG sample
10- 16 F7.3 deg RAdeg Right ascension (J2000)
20- 25 F6.3 deg DEdeg Declination (J2000)
27 A1 --- l_L'CO10obs Limit flag on L'CO10obs
30- 34 F5.2 10+8K.km/s/pc2 L'CO10obs CO(1-0)line luminosity
38- 41 F4.2 10+8K.km/s/pc2 e_L'CO10obs ? Error on L'_CO10,obs
45- 48 F4.1 Msun/(K.km/s/pc2) CF ?=- Galactic CO-to-H2
conversion factor
52 A1 --- l_log(MH2) Limit flag on log(MH2)
55- 58 F4.2 [Msun] log(MH2) Molecular gas mass
62- 65 F4.2 [Msun] e_log(MH2) ? Error on the molecular gas mass
68- 71 F4.2 --- fap Aperture factor
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- CAVITY Catalogue ID in the CO-VG sample
9- 13 F5.2 [Msun] logM* Log of stellar mass
17- 20 F4.2 [Msun] e_logM* Error of stellar mass
23- 27 F5.2 [Msun/yr] logSFR ?=- Log star formation rate
31- 34 F4.2 [Msun/yr] e_logSFR ?=- Error of SFR
37- 40 F4.2 --- 12+logO/H ?=- Gas-phase metallicity
--------------------------------------------------------------------------------
Acknowledgements:
Monica I. Rodriguez, monica-rodriguez(at)ugr.es
(End) Patricia Vannier [CDS] 28-Oct-2024