0
Assigned ID: 427
----- Attempting Submission 1 (Fri Apr 11 11:34:53 GMT 2014) -----
0
----- Attempting Submission 1 (Tue Jul 22 18:34:25 GMT 2014) -----
Unveiling the merger fraction, sizes and morphologies of the brightest z ~ 7 galaxies
The study of ultra-high-redshift galaxies has undoubtedly been led by HST, with surveys such as the UDF, CANDELS and BoRG leading to the discovery of hundreds of Lyman-break galaxies at z > 6. Furthermore, the unrivalled near-infrared sensitivity and resolution of WFC3 has enabled the first measurement of galaxy size and morphology at the highest redshifts, showing that the faintest galaxies are extremely compact and revealing disturbed morphologies for a subset of objects. The galaxies studied to-date however, are predominantly sub-L* due to the small cosmological volumes probed by the HST imaging used to select them. Our recent work has exploited the combined 1.7 square degrees of the UltraVISTA and UDS surveys (Bowler et al. 2014, 2012) to select the first robust sample of 20 extremely bright (-23.0 < M_UV < -21.5) Lyman-break galaxies at z ~ 7. However, the available ground-based imaging is insufficient to reliably unveil the sizes and morphologies of this unique galaxy sample. Therefore, we propose to obtain follow-up imaging of the sample with HST, to utilize the unrivalled high-resolution imaging capabilities of WFC3 in answering the following key questions: i) what is the merger fraction amongst the brightest z ~ 7 galaxies? ii) how does this impact on the (currently controversial) form of the luminosity function at the bright end? iii) is there a strong size-luminosity relation already in place at z ~ 7?
The 17 objects we will imaging with HST/WFC3 are widely separated, hence we require 17 separate pointings. Each object is imaged for one orbit and in a single visit. The F140W filter is used with a simple 4 point dither pattern to enable improved PSF reconstruction, splitting each orbit into four separate exposures of ~ 600s each. We use the SPARS50 sampling rate with NSAMP = 14 to ensure a high number of non-destructive reads for cosmic ray rejection.
UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE
12
false
false
false
false
false
SUPPORTED
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 25.1
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 25.0
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 24.8
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 25.3
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 24.5
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 25.4
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 25.6
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 24.8
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 25.0
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 25.6
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 24.0
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 24.3
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 24.5
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 24.4
GALAXY
HIGH REDSHIFT GALAXY
J2000
J2000
total J-band AB magnitude = 24.9
GALAXY
HIGH REDSHIFT GALAXY
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J2000
total J-band AB magnitude = 25.0
GALAXY
HIGH REDSHIFT GALAXY
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J2000
total J-band AB magnitude = 25.1
WFC3/IR
Imaging
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F140W
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POS-TARG
DITHER
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LINE
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:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)
true
1
0
/Users/rebeccabowler/Desktop/OP-cache/Cycle22PhaseII-v17.xml
The scheduling data was generated by CASM 22.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 13793
:visit-id "17"
:proposal-version -1
:trans-version "20140605"
:date "05-Jul-2014 20:22:22.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "30"
:si-bright-earth-limb-angle 20.0
:data-volume 1044528
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13793
:visit-id "17"
:obset-id "17"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13793
:visit-id "17"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2840
:al-overhead-at-end 0
:internal-dur-at-end 519
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)
true
1
0