A z = 0 Multiwavelength Galaxy Synthesis. I. A WISE and GALEX Atlas of Local Galaxies

Abstract

We present an atlas of ultraviolet and infrared images of ∼ 15, 750 local (d 50 Mpc) galaxies, as observed by NASA's WISE and GALEX missions. These maps have matched resolution (FWHM 7.5 and 15 ), matched astrometry, and a common procedure for background removal. We demonstrate that they agree well with resolved intensity measurements and integrated photometry from previous surveys. This atlas represents the first part of a program (the z = 0 Multi-wavelength Galaxy Synthesis) to create a large, uniform database of resolved measurements of gas and dust in nearby galaxies. The images and associated catalogs will be publicly available at the NASA/IPAC Infrared Science Archive. This atlas allows us estimate local and integrated star formation rates (SFRs) and stellar masses (M ) across the local galaxy population in a uniform way. In the appendix, we use the population synthesis fits of Salim et al. (2016Salim et al. ( , 2018 to calibrate integrated M and SFR estimators based on GALEX and WISE. Because they leverage an SDSS-base training set of > 100, 000 galaxies, these calibrations have high precision and allow us to rigorously compare local galaxies to Sloan Digital Sky Survey results. We provide these SFR and M estimates for all galaxies in our sample and show that our results yield a "main sequence" of star forming galaxies comparable to previous work. We also show the distribution of intensities from resolved galaxies in NUV-to-WISE1 vs. WISE1-to-WISE3 space, which captures much of the key physics accessed by these bands.

Molecular Gas Properties on Cloud Scales across the Local Star-forming Galaxy Population

“…(5-6) galaxy inclination and position angle (Lang et al 2020); (7-9) galaxy global stellar mass, SFR, and the effective (half-mass) radius estimated from the measured stellar scale length (Leroy et al 2019;A. K. Leroy et al 2020a, in preparation); (10-11) CO data rms noise and channel-to-channel correlation at 150 pc resolution;…”

Dynamical Equilibrium in the Molecular ISM in 28 Nearby Star-forming Galaxies

“…For this purpose, we create a multiwavelength data set, which includes high-resolution PHANGS-ALMA CO (2−1) imaging data (A. K. Leroy et al 2020, in preparation) and GMC catalogs (A. Hughes et al 2020, in preparation;E.Rosolowsky et al 2020, in preparation), new and archival H I 21cm data (D. Utomo et al 2020, in preparation), processed Spitzer IRAC 3.6μm data (S G 4 ; Querejeta et al 2015), and combined GALEX near-UV and WISE mid-IR data (z0MGS; Leroy et al 2019). These data provide us with a comprehensive picture of the molecular gas distribution and kinematics on ∼60-120pc scales (i.e., cloud scales), as well as the distribution of gas mass, stellar mass, and SFR on ∼1kpc scales.…”

“…We combine GALEX near-UV (NUV) data and WISE mid-IR (MIR) data to derive kpc-scale SFR estimates. We use the postprocessed GALEX NUV images and WISE 12 μm images from the z=0 Multiwavelength Galaxy Synthesis (z0MGS; Leroy et al 2019). These images are corrected for background, aligned for astrometry, and masked to remove foreground stars.…”

The lifecycle of molecular clouds in nearby star-forming disc galaxies

“…In addition to these targets, we also include the galaxy NGC5194 for which archival observational data of Hα and CO(1-0) are also available at a similar spatial resolution (Pety et al 2013;Schinnerer et al 2013). The main characteristics Leroy et al (2019) and references therein, with typical uncertainties of 0.1 dex. b Mean molecular gas mass-weighted metallicity based on Pilyugin et al (2014), with typical uncertainties of 0.03 dex.…”