v8 - Rychardcomments added v2
378007634
Assigned ID: 205
----- Attempting Submission 1 (Thu Apr 07 09:34:54 GMT 2016) -----
HST Phase I Proposal 205 (c24-supereights-v0.apt) successfully submitted.
Receipt: # 205-1
----- Attempting Submission 2 (Fri Apr 08 13:20:21 GMT 2016) -----
HST Phase I Proposal 205 (c24-supereights-v0.apt) successfully submitted.
Receipt: # 205-2
----- Attempting Submission 3 (Fri Apr 08 14:27:53 GMT 2016) -----
HST Phase I Proposal 205 (c24-supereights-v0.apt) successfully submitted.
Receipt: # 205-3
----- Attempting Submission 4 (Fri Apr 08 17:55:54 GMT 2016) -----
HST Phase I Proposal 205 (c24-supereights-v0.apt) successfully submitted.
Receipt: # 205-4
----- Attempting Submission 5 (Fri Apr 08 19:10:59 GMT 2016) -----
HST Phase I Proposal 205 (c24-supereights-v0.apt) successfully submitted.
Receipt: # 205-5
----- Attempting Submission 6 (Fri Apr 08 19:41:02 GMT 2016) -----
HST Phase I Proposal 205 (c24-supereights-v0.apt) successfully submitted.
Receipt: # 205-6
Dithered observations with ACS/F814W of the supereights.
Fixed the coordinates fo BORG_0116+1425_747
changed to the WFC-CTE1 aperture.
638497561
----- Attempting Submission 1 (Wed Jul 20 08:04:33 GMT 2016) -----
----- Attempting Submission 2 (Fri Sep 23 14:13:15 GMT 2016) -----
----- Attempting Submission 3 (Mon Sep 26 19:16:36 GMT 2016) -----
A co-I, G. Williger, was added with the approval of STSCI.
Super-Eight: The brightest z~8 Galaxies
What are the properties of the most massive z~8 galaxies ("Super-Eights") and how luminous can these galaxies become at that epoch? Answering these questions is challenging due to the rarity of luminous z~8 galaxies and the large field-to-field variations in their volume densities. Indeed, the full wide-area CANDELS program only shows 3 z~8 galaxy candidates brighter than 25.5 mag and all of these candidates conspicuously lie in the same CANDELS field (EGS).
One of our strongest new probes for particularly luminous z~8 galaxies are the WFC3 Pure-Parallel (PP) programs. Particularly intriguing are 8 bright z~8 candidates in these observations. These candidates have similar luminosities as the 3 brightest z~8 candidates from CANDELS (all spectroscopically confirmed). However, the uncertain contamination levels at extreme bright end of z~8 selection mean that follow-up observations are critical. We propose highly-efficient pointed HST and Spitzer/IRAC observations to determine if these candidates are indeed at z~8. We estimate that anywhere from 50 to 100% of the targeted sources will be confirmed to be at z~8 based on our results from CANDELS. The estimate is very uncertain due to very large cosmic variance in the CANDELS result and contamination from rare low-redshift sources.
When combined with CANDELS, our observations would provide us the strongest current constraints on the volume density of bright, massive galaxies in the early Universe (serving as a guide to models of their build-up) and also provide valuable targets for future spectroscopy (e.g. with JWST), useful for probing the ionization state of the IGM.
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