NOAO >   Observing Info >   Approved Programs >   2018A-0275

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Program Information for 2018A-0275


PI: Andrew Battisti, Australian National U., Andrew.Battisti@anu.edu.au
Address: RSAA, Mount Stromlo Observatoy, Cotter Rd, Weston Creek, ACT 2611 Australia

CoI: Matthew A Malkan, UCLA
CoI: Patrick McCarthy, Carnegie Observatories
CoI: Elisabete Da Cunha, Australian National U.
CoI: Y Sophia Dai, National Astronomy Observatory of China
CoI: Marc Rafelski, STScI
CoI: Alaina Henry, STScI
CoI: Claudia Scarlata, U. of Minnesota

Title: Sweeping Away the Dust: Understanding Attenuation up to the Peak of Cosmic Star Formation

Abstract: Obtaining a detailed census of galaxy properties through cosmic time is crucial to our understanding of galaxy evolution. However, large uncertainties (factors $sim$2-10) lie in how dust attenuation corrections are applied. This issue can be resolved with the $HST$ WFC3 IR Spectroscopic Parallel (WISP) survey, which acquired dust-sensitive emission line diagnostics (Balmer decrement; $mathrm{H}alpha/mathrm{H}beta$) for thousands of galaxies at $0.75<z<1.5$. We propose obtaining $u'$ and $g'$-band observations for 13 deep fields in the WISP survey, which already have ancillary data at longer wavelengths from $HST$ and $SST$. These new data provide crucial rest-frame ultraviolet observations, where attenuation is the strongest, and allows us to constrain key issues regarding dust attenuation in galaxies at $zsim1$: 1) the star/dust geometry giving rise to the attenuation, 2) the average dust attenuation curve over the entire far- ultraviolet to near-infrared wavelength range, and 3) the strength of the 2175~AA dust feature in the attenuation curve. These observations will also enable us to obtain significantly improved derivations of physical properties for galaxies in these fields for additional WISP science.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2018A):  WIYN/ODI -- 2.5n on Jun 10 - Jun 12 2018


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2018A-0275

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