NOAO >   Observing Info >   Approved Programs >   2018A-0005

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Program Information for 2018A-0005


PI: James Schombert, U. of Oregon, jschombe@uoregon.edu
Address: Dept. of Physics, 461 Willamette Hall, Eguene, OR 97403 USA

CoI: Stacy McGaugh, Case Western Reserve U.

Title: UV Imaging of LSB Dwarfs/Disks

Abstract: This project is to obtain deep U images of a unique sample of LSB dwarfs/disks galaxies. While the UV luminosity of most galaxies is strongly tied to the current SFR of a galaxy, recent studies have questioned the tight correlation between SFR from H$alpha$ and the UV (which has enormous impact on SFR evolution studies). In particular, Meurer et al. (2009) have stated that there is a strong correlation in $F_{Halpha}/f_{UV}$ with surface brightness, morphology and dynamical mass (i.e., the ratio is part of a larger family of scaling relations). This result is at odds with our HST imaging of several LSB galaxies and we suspect the range of surface brightness was inadequate to make such claims. Therefore, we propose to make Johnson $U$ observations of a unique sample of LSB galaxies (truly LSB, not intermediate as presented in $GALEX$ papers), ranging in baryonic mass, size, gas fraction and H$alpha$ SFR. All the targets proposed herein have a complete set of optical, H$alpha$ and {it Spitzer} imaging. These new UV observations will provide a spatial analysis of UV structure and luminosity of LSB galaxies with direct comparison to the optical and near-IR images for the same objects. This is the last missing link in understanding the star formation history and stellar populations of these important galaxies.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2018A):  LCO-2m/Spectral -- 5.5hrs


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