NOAO >   Observing Info >   Approved Programs >   2017B-0298

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Program Information for 2017B-0298


PI: Andrew J Battisti, U. Mass, abattist@astro.umass.edu
Address: Astronomy Department, 710 North Pleasant Street, Amherst, MA 01003 USA

CoI: Y Sophia Dai, California Institute of Technology
CoI: Matthew Malkan, UCLA
CoI: Elisabete Da Cunha, Australian National U.

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, a large uncertainty (factors $sim$2-10) in modeling galaxy spectral energy distributions (SEDs) lies 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; $mathrm{H}alpha/mathrm{H}beta$) in thousands of galaxies at $0.75<z<1.5$. We propose obtaining $U$ and $B$- band observations for 16 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 dust attenuation is the strongest, and allows us to constrain key issues regarding galaxy attenuation at $zsim1$: 1) the dominant star/dust geometry giving rise to the attenuation, 2) the strength of the 2175~AA dust feature, and 3) the average dust attenuation curve over the entire far-ultraviolet to near-infrared wavelength range.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 2 (2017B):  WIYN/ODI -- 2.5n on Jan 09 - Jan 13 2018


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NOAO >   Observing Info >   Approved Programs >   2017B-0298

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