JINGLE: The JCMT dust and gas In Nearby Galaxies Legacy Exploration

– A new local galaxy evolution legacy survey

JINGLE is a new JCMT Large Program designed to systematically study the cold ISM of galaxies in the local Universe. Over the next three years and with 780 hours of observing, JINGLE will provide integrated 850μm continuum measurements with SCUBA-2 for a representative sample of 190 Herschel-selected galaxies, as well as integrated CO(2-1) line fluxes with RxA for a subset of 75 of these galaxies.

For more information please visit the JINGLE homepage


Distribution of the targeted and parent samples in the SFR-M∗ plane. Left: Coloured symbols show the galaxies from the parent sample where 850μm fluxes are predicted to be detectable at the 4σ level within 2 hours of integration in some weather band. Middle: Coloured symbols show those galaxies where we predict a detection of the CO(2-1) line within a total of 5 hours (i.e. 2h on source). Right: A summary of our final sample selection, including 190 galaxies for SCUBA-2 observations (magenta and blue symbols), 75 of which will also be targeted by RxA for CO(2-1) (magenta symbols).

The position of the sample in the SFR-stellar mass plane is shown in the figure above. The observations will allow for the robust characterisation of the dust properties, as well as the measurement of total molecular gas masses for the RxA subsample. The galaxies are selected in fields targeted by MaNGA optical integral-field spectroscopic observations, which are also fields with Herschel/SPIRE photometry from the H-ATLAS survey and coverage from upcoming, new, blind interferometric HI surveys.

The combination of all these datasets will allow a detailed characterisation of the gas and dust properties and of the kinematics and metal contents of these galaxies, the derivation of scaling relations between dust, gas, and global properties, as well as provide critical benchmarks for high-redshift studies with JCMT and ALMA. Specific science questions that will be addressed include:

  • Determining dust emissivities and looking for systematic dependencies of β on global galaxy properties such as metallicity, stellar mass or SFR. As shown in the figure below, the addition of the SCUBA-2 data significantly increases the accuracy of the simultaneous measurement of dust temperatures and β over a Herschel-only sample.


Left: H-ATLAS photometry of J120849.66+011130.5 (black points), with modified- blackbody models with different β overlaid: β = 1.5 (red dashed line) and β = 2.0 (green dashed line). Clearly, the Herschel data alone cannot distinguish between the two scenarios, but the addition of a data point at 850μm does (e.g. the blue data point is a predicted 850μm SCUBA-2 flux for β = 2). Right: Surface density plots showing the uncertainties in both β and Tdust for Monte-Carlo simulations of Herschel data only (top) and Herschel+SCUBA-2 data (bottom). The uncertainties on β and Tdust are drastically reduced with the addition of the SCUBA-2 850μm datum.

  • Deriving scaling relations between dust mass and global galaxy properties. JINGLE’s statistically robust sample of galaxies with 850μm measurements as well as Herschel photometry will provide for the first time an unbiased view of dust scaling relations in the local universe.

  • Studying the dust-to-gas mass ratio to establish if and how it varies as a function of stellar mass, metallicity, SFR, thus informing high redshift studies relying on dust measurements and a dust-to-gas ratio to infer total molecular gas masses.

  • Investigating the correlation between total cold gas and dust masses and spatially-resolved quantities from the MaNGA observations (such as gradients of SFR, metallicity, stellar age, ionisation mechanisms,..). This information will shed new light on the question of star formation quenching and its link to changes in the internal structure of galaxies.

Coordinators: A. Saintonge (UK), C. Wilson (Canada), T. Xiao (EAO/China)

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