NOAO >   Observing Info >   Approved Programs >   2018A-0424

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Program Information for 2018A-0424


PI: Haojing Yan, U. of Missouri, Columbia, yanha@missouri.edu
Address: 223 Physics Building, Department of Physics and Astronomy, University of Missouri, Columbia, MO, 65203 USA

CoI: Chenxiaoji Ling, U. of Missouri, Columbia
CoI: zhiyuan Ma, U. of Missouri, Columbia
CoI: Marat Musin, U. of Missouri, Columbia
CoI: James Runge, U. of Missouri, Columbia

Title: Understanding WISE W1-dropouts in the Context of JWST High-z Studies

Abstract: JWST's search for "First Objects" is likely to extend to z~30, and such candidates will be selected through the classic dropout technique. At the brightness level of interest (AB ~ 28-32 mag), JWST is unlikely to perform spectroscopic identification of the majority and hence the candidates will have to be used statistically. Therefore, it is critical to understand the possible contamination to such high-z dropout sample. Using the WISE data, we mimic the F356W-dropout selection by searching for W1-dropouts ("W1Drops") at |b|>20 deg. While such objects are likely to be the coolest brown dwarfs, it is not yet clear if this is the only interpretation. Our sample consists of 103 objects, however only 30 of them are reported in the WISE-selected brown dwarf sample of Kirkpatrick et al. (2011) despite that the latter has much less stringent selection criteria. In our pilot study of 17 W1-dropouts using the WIYN/WHIRC near-IR imager, only three are detected to AB ~ 21 mag (5-sigma), among which two have significant offset with respect to the WISE positions. Here we propose to observe 10 northern W1Drops to AB ~ 23 mag in JHKs to put much tighter constraints on their SEDs to help understand their nature and the implication to the purity of future JWST "First Object" samples.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2018A):  LBT-SVC/LUCI -- 5hrs


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NOAO >   Observing Info >   Approved Programs >   2018A-0424

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