0
Assigned ID: 504
----- Attempting Submission 1 (Fri Apr 11 14:48:13 GMT 2014) -----
HST Phase I Proposal 504 (amd_cy22.apt) successfully submitted.
----- Attempting Submission 2 (Fri Apr 11 23:31:27 GMT 2014) -----
HST Phase I Proposal 504 (amd_cy22.apt) successfully submitted.
For the remaining 10 visits, POS TARG = -19 arcsec in Y has been added for the UVIS observations to move the science target down on the detector.
402970944
----- Attempting Submission 1 (Thu Jul 24 16:51:31 GMT 2014) -----
----- Attempting Submission 2 (Thu Jul 24 21:36:03 GMT 2014) -----
----- Attempting Submission 3 (Tue Aug 12 07:00:13 GMT 2014) -----
----- Attempting Submission 4 (Tue Aug 12 16:58:58 GMT 2014) -----
----- Attempting Submission 6 (Fri Aug 15 05:46:54 GMT 2014) -----
----- Attempting Submission 7 (Fri Aug 15 15:50:02 GMT 2014) -----
----- Attempting Submission 8 (Mon Mar 23 22:44:22 GMT 2015) -----
How Compact is the Stellar Mass in Eddington-Limited Starbursts?
Theoretical models require strong ejective feedback to quench star formation in massive galaxies. To provide observational constraints on how this feedback process works, we have identified a sample of massive galaxies that have recently experienced a feedback-limited starburst and exhibit high-velocity, galactic-scale outflows. Our previous HST observations have shown that these galaxies are the remnants of gas-rich major mergers, and their incredibly compact optical morphologies (half-light radii ~ 100 pc) suggest that feedback from massive stars and supernovae was responsible for launching their spectacular gaseous outflows (v=500-2500 km/s). However, there is a crucial outstanding question regarding the outflow launching mechanism: how do the velocities compare to the escape velocity of the central stellar population? The current data at rest-frame V are sufficient to measure the size of the recent starburst, but we need to know how much mass is associated with this compact component in order to determine the escape velocity. Here we propose rest-frame U and rest-frame J observations for 12 extremely compact galaxies with high-velocity outflows and SFR surface densities that approach the Eddington limit. We will use spatially resolved U-V and V-J colors in tandem with the well-sampled, spatially integrated SED to determine the fraction of the stellar mass that is associated with the compact starburst. This will determine whether (1) the launching mechanism exceeds the escape velocity by a large factor or (2) the observed outflow velocity is comparable to the escape velocity, implying that these are the most compact galaxies ever observed by HST.
We are obtaining WFC3/UVIS F475W and WFC3/IR F160W imaging of 12 compact massive galaxies at z=0.4-0.8 that have been observed previously with WFC3/UVIS F814W as part of programs GO-12019 and GO-12272. The morphologies of these galaxies are dominated by a compact central starburst, and our primary goal is to measure spatially resolved F475W - F814W and F814W - F160W colors for both the compact starburst and the extended diffuse emission. These galaxies have total AB magnitudes in the existing WFC3/UVIS F814W images between 18.4 and 19.1, and the measured half-light radius for the compact source is quite small (between 0.02" and 0.05" in most cases, which is smaller than the PSF FWHM). Our goal is to obtain the best possible spatial resolution, and this motivates the use of the WFC3-UVIS-DITHER-BOX and WFC3-IR-DITHER-BOX dither patterns. We will observe each target for one orbit with WFC3/UVIS F475W (using the "UVIS2" aperture) and one orbit with WFC3/IR F160W (using the "IR" aperture), and each orbit will be divided into four exposures. We have specified visit orientation requirements that are necessary to match the coverage of our previous WFC3/UVIS F814W images.
UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE
12
Regular
false
false
false
false
false
SUPPORTED
GALAXY
STARBURST
SDSSJ150636.30+540220.9
J2000
J2000
g=19.1, H=18.2 [AB]
GALAXY
STARBURST
J2000
J2000
g=19.6, H=18.6
GALAXY
STARBURST
J2000
J2000
g=19.0, H=18.4
GALAXY
STARBURST
SDSSJ094417.85+093019.4
J2000
J2000
g=19.8, H=18.4
GALAXY
STARBURST
SDSSJ214000.49+120914.6
J2000
J2000
g=20.1, H=18.6
GALAXY
STARBURST
SDSSJ082638.41+430529.5
J2000
J2000
g=19.4, H=18.4
GALAXY
STARBURST
SDSSJ161332.53+283414.8
J2000
J2000
g=19.8, H=17.6
GALAXY
STARBURST
J2000
J2000
g=19.5, H=17.7
GALAXY
STARBURST
J2000
J2000
g=19.5, H=18.3
GALAXY
STARBURST
J2000
J2000
g=19.3, H=18.0
GALAXY
STARBURST
J2000
J2000
g=19.0, H=17.5
GALAXY
STARBURST
J2000
J2000
g=20.0, H=18.6
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F475W
POS-TARG
DITHER
0.173
LINE
0.112
false
false
81.785
4
23.884
WFC3-UVIS-DITHER-BOX
1
false
POS-TARG
DITHER
0.572
LINE
0.365
false
false
74.653
4
18.528
WFC3-IR-DITHER-BOX-MIN
2
false
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:orbit-number 1
:pcs-time 333
:si-vis-utilization 2888
:al-overhead-at-end 116
:internal-dur-at-end 31
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13689
:visit-id "12"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2840
:al-overhead-at-end 0
:internal-dur-at-end 500
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)
true
2
0