xGASS: total cold gas scaling relations and molecular-to-atomic gas ratios of galaxies in the local Universe

Catinella, Barbara; Saintonge, A.; Janowiecki, Steven; Cortese, Luca; Davé, Romeel; Lemonias, Jenna J.; Cooper, Andrew P.; Schiminovich, David; Hummels, Cameron; Fabello, Silvia; Geréb, K.; Kilborn, V. A.; Wang, Jing

doi:10.1093/mnras/sty089

Cited by 385 publications

(590 citation statements)

References 76 publications

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“…Recent studies of single dish spectra of Virgo and Abell 1367 cluster galaxies considered A flux > 2σ or 3σ as likely produced by external, environmental influences and found asymmetric fractions of ∼ 16-26% (Scott et al 2018) and 27% for close galaxy pairs (Bok et al 2019) using the AMIGA sample 3σ significance threshold. Watts et al (2020) classified xGASS (Catinella et al 2018) galaxies as satellites or centrals and measured A flux , finding that satellites show a higher frequency of asymmetries than centrals, which supports the previous findings of asymmetries being more common in higher density environments. However, taking this further and understanding the physical origin of spectral asymmetries requires knowledge of the spatial distribution of gas within galaxies and the gas kinematics.…”

Section: Introductionsupporting

confidence: 78%

H i asymmetries in LVHIS, VIVA, and HALOGAS galaxies

Reynolds

Westmeier

Staveley‐Smith

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present an analysis of morphological, kinematic and spectral asymmetries in observations of atomic neutral hydrogen (H i) gas from the Local Volume H i Survey (LVHIS), the VLA Imaging of Virgo in Atomic Gas (VIVA) survey and the Hydrogen Accretion in Local Galaxies Survey (HALOGAS). With the aim of investigating the impact of the local environment density and stellar mass on the measured H i asymmetries in future large H i surveys, we provide recommendations for the most meaningful measures of asymmetry for use in future analysis. After controlling for stellar mass, we find signs of statistically significant trends of increasing asymmetries with local density. The most significant trend we measure is for the normalised flipped spectrum residual (A spec ), with mean LVHIS and VIVA values of 0.204 ± 0.011 and 0.615 ± 0.068 at average weighted 10 th nearest-neighbour galaxy number densities of log(ρ 10 /Mpc −3 ) = −1.64 and 0.88, respectively. Looking ahead to the WALLABY survey on the Australian Square Kilometre Array Pathfinder (ASKAP), we estimate that the number of detections will be sufficient to provide coverage over 5 orders of magnitude in both local density and stellar mass increasing the dynamic range and accuracy with which we can probe the effect of these properties on the asymmetry in the distribution of atomic gas in galaxies.

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Section: Introductionsupporting

confidence: 78%

H i asymmetries in LVHIS, VIVA, and HALOGAS galaxies

Reynolds

Westmeier

Staveley‐Smith

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…Our new model produces realistic HI gas fractions over three orders of magnitude in HI mass. (Catinella et al 2018) data. The comparison is restricted to starforming galaxies (defined as galaxies not more than 1 dex below the main sequence).…”

Section: Gas Propertiesmentioning

confidence: 99%

“…GASS (Saintonge et al 2017) and xGASS (Catinella et al 2018) data for star-forming galaxies. xCOLD GASS builds upon the original COLD GASS survey, providing a census of the molecular-gas content of a mass-selected sample (log 10 (M * / M ) > 9.0) at 0.01 < z < 0.05.…”

Section: H 2 Contentmentioning

confidence: 99%

L-GALAXIES 2020: Spatially resolved cold gas phases, star formation, and chemical enrichment in galactic discs

Henriques

Yates

et al. 2019

Monthly Notices of the Royal Astronomical Society

103

112

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We have updated the Munich galaxy formation model, L-galaxies, to follow the radial distributions of stars and atomic and molecular gas in galaxy discs. We include an H 2 -based star-formation law, as well as a detailed chemical-enrichment model with explicit mass-dependent delay times for SN-II, SN-Ia and AGB stars. Information about the star formation, feedback and chemical-enrichment histories of discs is stored in 12 concentric rings. The new model retains the success of its predecessor in reproducing the observed evolution of the galaxy population, in particular, stellar mass functions and passive fractions over the redshift range 0 z 3 and mass range 8 log(M * / M ) 12, the black hole-bulge mass relation at z = 0, galaxy morphology as a function of stellar mass and the mass-metallicity relations of both stellar and gas components. In addition, its detailed modelling of the radial structure of discs allows qualitatively new comparisons with observation, most notably with the relative sizes and masses of the stellar, atomic and molecular components in discs. Good agreement is found with recent data. Comparison of results obtained for simulations differing in mass resolution by more than two orders of magnitude shows that all important distributions are numerically well converged even for this more detailed model. An examination of metallicity and surface-density gradients in the stars and gas indicates that our new model, with star formation, chemical enrichment and feedback calculated self-consistently on local disc scales, reproduces some but not all of the trends seen in recent many-galaxy IFU surveys.

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“…The sample used throughout this paper is the extended GALEX Arecibo SDSS Survey (xGASS; Catinella et al 2010Catinella et al , 2018. This survey contains 1179 galaxies selected only by redshift (0.01 < z < 0.05) and stellar mass (10 9 < M < 10 11.5 M ), and currently represents the deepest sample of cold gas observations for galaxies in the local Universe to date.…”

Section: Sample and Summary Of Datamentioning

confidence: 99%

xGASS: the role of bulges along and across the local star-forming main sequence

Cook

Cortese

Catinella

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We use our catalogue of structural decomposition measurements for the extended GALEX Arecibo SDSS Survey (xGASS) to study the role of bulges both along and across the galaxy star-forming main sequence (SFMS). We show that the slope in the sSF R-M relation flattens by ∼0.1 dex per decade in M when re-normalising sSF R by disc stellar mass instead of total stellar mass. However, recasting the sSF R-M relation into the framework of only disc-specific quantities shows that a residual trend remains against disc stellar mass with equivalent slope and comparable scatter to that of the total galaxy relation. This suggests that the residual declining slope of the SFMS is intrinsic to the disc components of galaxies. We further investigate the distribution of bulge-to-total ratios (B/T) as a function of distance from the SFMS (∆SF R M S ). At all stellar masses, the average B/T of local galaxies decreases monotonically with increasing ∆SF R M S . Contrary to previous works, we find that the upper-envelope of the SFMS is not dominated by objects with a significant bulge component. This rules out a scenario in which, in the local Universe, objects with increased star formation activity are simultaneously experiencing a significant bulge growth. We suggest that much of the discrepancies between different works studying the role of bulges originates from differences in the methodology of structurally decomposing galaxies.

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xGASS: total cold gas scaling relations and molecular-to-atomic gas ratios of galaxies in the local Universe

Cited by 385 publications

References 76 publications

H i asymmetries in LVHIS, VIVA, and HALOGAS galaxies

H i asymmetries in LVHIS, VIVA, and HALOGAS galaxies

L-GALAXIES 2020: Spatially resolved cold gas phases, star formation, and chemical enrichment in galactic discs

xGASS: the role of bulges along and across the local star-forming main sequence

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