MASCOT -- An ESO-ARO legacy survey of molecular gas in nearby SDSS-MaNGA
  galaxies: I. first data release, and global and resolved relations between
  H_2 and stellar content
  We present the first data release of the MaNGA-ARO Survey of CO Targets
(MASCOT), an ESO Public Spectroscopic Survey conducted at the Arizona Radio
Observatory (ARO). We measure the CO(1-0) line emission in a sample of 187
nearby galaxies selected from the Mapping Nearby Galaxies at Apache Point
Observatory (MaNGA) survey that has obtained integral field unit (IFU)
spectroscopy for a sample of ~ 10,000 galaxies at low redshift. The main goal
of MASCOT is to probe the molecular gas content of star-forming galaxies with
stellar masses > 10^9.5 M_solar and with associated MaNGA IFU observations and
well-constrained quantities like stellar masses, star formation rates and
metallicities. In this paper we present the first results of the MASCOT survey,
providing integrated CO(1-0) measurements that cover several effective radii of
the galaxy and present CO luminosities, CO kinematics, and estimated H2 gas
masses. We observe that the decline of galaxy star formation rate with respect
to the star formation main sequence (SFMS) increases with the decrease of
molecular gas and with a reduced star formation efficiency, in agreement with
results of other integrated studies. Relating the molecular gas mass fractions
with the slope of the stellar age gradients inferred from the MaNGA
observations, we find that galaxies with lower molecular gas mass fractions
tend to show older stellar populations close to the galactic center, while the
opposite is true for galaxies with higher molecular gas mass fractions,
providing tentative evidence for inside-out quenching.
