NOAO >   Observing Info >   Approved Programs >   2021B-0303

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Program Information for 2021B-0303


PI: Sunil Simha, UC Santa Cruz, shassans@ucsc.edu
Address: Department of Astronomy and Astrophysics, 1156 High Street, MS: UCO / LICK, Santa Cruz, CA 95064 USA

CoI: Khee-Gan Lee, University of Tokyo
CoI: Jason Prochaska, UC Santa Cruz
CoI: Wen-fai Fong, Northwestern U.
CoI: Jeffrey Cooke, Swinburne U.
CoI: Jielai Zhang, Swinburne U.
CoI: Ryan Shannon, Swinburne U.
CoI: Yuxin Huang, University of Tokyo
CoI: Charles Kilpatrick, Northwestern U.
CoI: Nicolas Tejos, Pontificia Universidad Catolica de Chile

Title: Pre-Imaging of Foreground Contributors to FRB Dispersion Measures

Abstract: Fast Radio Bursts (FRBs) are a relatively newly discovered class of radio transients that have intrigued astronomers over the last decade. Key among its properties is the characteristic frequency dispersion that occurs due to the integrated line-of-sight free electron density that the FRB pulse travels through. Being predominantly extragalactic, FRBs are a therefore unique probe of large-scale ionized matter density. While previous work has shown that FRB dispersion measures are consistent with predictions from standard $Lambda$CDM cosmology, conclusively solving the "missing baryon problem", major questions remain unanswered regarding the exact nature of the baryon distribution. Our collaboration aims to carry out a spectroscopic census of foreground galaxies in the fields of FRBs localized by ASKAP, so that we may determine with better than 10% precision, the fraction of cosmic baryons that reside outside virialized halos and the fraction of halo baryons that exist in the hot phase ($sim10^7K$). We have already obtained telescope time on the AAT/2dF-AAOmega and Keck LRIS/DEIMOS spectrographs for large scale spectroscopic observations. However, selecting the foreground targets requires deep pre-imaging and photo-z analysis. Here, we propose to leverage the wide field imaging capability of DECam and medium-band filters on SOAR Optical Imager to enable our spectroscopic follow-up.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2021B):  CT-4m/DECam -- 1.5n on Aug 08 - Aug 10 2021
Run 2 (2021B):  SOAR/SOI -- 3n on Sep 08 - Sep 10 2021


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