English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present CO(J=1-0) and/or CO(J=2-1) spectroscopy for 31 galaxies selectedfrom the ongoing MaNGA survey, obtained with multiple telescopes. This sampleis combined with CO observations from the literature to study the correlationof the CO luminosities ($L_{\rm CO(1-0)}$) with the mid-infrared luminositiesat 12 ($L_{12 \mu m}$) and 22 $\mu$m ($L_{\rm 22 \mu m}$), as well as thedependence of the residuals on a variety of galaxy properties. The correlationwith $L_{\rm 12 \mu m}$ is tighter and more linear, but galaxies withrelatively low stellar masses and blue colors fall significantly below the mean$L_{\rm CO(1-0)}-L_{\rm 12\mu m}$ relation. We propose a new estimator of theCO(1-0) luminosity (and thus the total molecular gas mass) that is a linearcombination of three parameters: $L_{\rm 12 \mu m}$, $M_\ast$ and $g-r$. Weshow that, with a scatter of only 0.18 dex in log $(L_{\rm CO(1-0)})$, thisestimator provides unbiased estimates for galaxies of different properties andtypes. An immediate application of this estimator to a compiled sample ofgalaxies with only CO(J=2-1) observations yields a distribution of theCO(J=2-1) to CO(J=1-0) luminosity ratios ($R21$) that agrees well with thedistribution of real observations, in terms of both the median and the shape.Application of our estimator to the current MaNGA sample reveals a gas-poorpopulation of galaxies that are predominantly early-type and show nocorrelation between molecular gas-to-stellar mass ratio and star formationrate, in contrast to gas-rich galaxies. We also provide alternative estimatorswith similar scatters, based on $r$ and/or $z$ band luminosities instead of$M_\ast$. These estimators serve as cheap and convenient $M_{\rm mol}$ proxiesto be potentially applied to large samples of galaxies, thus allowingstatistical studies of gas-related processes of galaxies.

Estimating the molecular gas mass of low-redshift galaxies from a combination of mid-infrared luminosity and optical properties