Assigned ID: 682
----- Attempting Submission 1 (Fri Feb 25 21:45:49 GMT 2011) -----
----- Attempting Submission 1 (Wed Jul 06 21:27:06 GMT 2011) -----
Fundamental Parameters of the SHIELD Galaxies
The "Survey of HI in Extremely Low-mass Dwarfs" ("SHIELD") is an ongoing EVLA multi-configuration study of the neutral ISM of 12 extremely low-mass (HI mass <10 million M_Sun) galaxies discovered by the Arecibo Legacy Fast ALFA (ALFALFA) survey. The SHIELD galaxies are among the lowest-mass gas-rich objects that harbor stellar populations. These systems span the critical mass range that connects the comparatively massive dwarfs of the local universe to the lowest-mass candidate "minihalos" and "Leo-T" type objects. Further, the halos in this dynamical mass range are predicted to differentiate between systems that are readily destroyed and systems with typical baryon fractions. These galaxies thus constitute a cosmologically important, but unexplored, population. We propose a holistic HST imaging study of the fundamental parameters and characteristics of these extremely low-mass galaxies. The primary science goal is the derivation of TRGB distances; the distance dependence of many fundamental parameters makes HST observations critical for the success of SHIELD. Additional science goals include an accurate census of the dark matter contents of these galaxies, a detailed spatial and temporal study of star formation within them, and a characterization of the nature of star formation in local conditions that differ markedly from those found in more massive galaxies. In order to complement our HST observations we also propose coordinated Spitzer imaging that will accurately constrain the total stellar masses of the SHIELD galaxies. This program will explore the stellar populations at the faint end of the HI mass function for the first time.
A CMD that reaches ∼1.5-2 mag below the TRGB feature (MI = −4.0) not only enables an excellent measurement of the distance but also allows a robust reconstruction of the recent SFH and constrains the long-term average SFH of a galaxy; we expect this photometric depth for all galaxies in our sample. We assume a maximum distance of 8 Mpc for the sample members, and run calculations for the maximum Galactic foreground of any sample member (E(B-V) = 0.09 for AGC 110482). The ACS exposure time calculator shows that we can reach this photometric depth with 1 orbit split between the F606W and F814W filters. We will CRSPLIT these into two images per filter to remove cosmic rays and facilitate bad pixel removal.
RESOLVED STELLAR POPULATIONS
12
false
0.0
14.0
0.0
false
false
false
false
SUPPORTED
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
GALAXY
AMORPHOUS IRREGULAR
J2000
J2000
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v01.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC748778
(Tic-Visit
:proposal-id 12658
:visit-id "01"
:proposal-version -1
:trans-version "20110509"
:date "28-Jun-2011 09:09:19.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "01"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2915
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3249
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v02.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC112521
(Tic-Visit
:proposal-id 12658
:visit-id "02"
:proposal-version -1
:trans-version "20110509"
:date "28-Jun-2011 09:09:20.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2923
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v03.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC110482
(Tic-Visit
:proposal-id 12658
:visit-id "03"
:proposal-version -1
:trans-version "20110509"
:date "28-Jun-2011 09:09:21.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "03"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2923
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v04.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC111946
(Tic-Visit
:proposal-id 12658
:visit-id "04"
:proposal-version -1
:trans-version "20110509"
:date "28-Jun-2011 08:11:28.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "04"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2923
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v05.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC111977
(Tic-Visit
:proposal-id 12658
:visit-id "05"
:proposal-version -1
:trans-version "20110509"
:date "28-Jun-2011 09:09:22.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "05"
:obset-id "05"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "05"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2923
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v06.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC111164
(Tic-Visit
:proposal-id 12658
:visit-id "06"
:proposal-version -1
:trans-version "20110509"
:date "28-Jun-2011 08:24:51.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "06"
:obset-id "06"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "06"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2923
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v07.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC174585
(Tic-Visit
:proposal-id 12658
:visit-id "07"
:proposal-version -1
:trans-version "20110509"
:date "06-Jul-2011 08:34:23.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "07"
:obset-id "07"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "07"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2909
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3242
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v08.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC174605
(Tic-Visit
:proposal-id 12658
:visit-id "08"
:proposal-version -1
:trans-version "20110509"
:date "28-Jun-2011 08:41:10.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "08"
:obset-id "08"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "08"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2909
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3242
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v09.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC182595
(Tic-Visit
:proposal-id 12658
:visit-id "09"
:proposal-version -1
:trans-version "20110509"
:date "30-Jun-2011 12:47:55.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "09"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2923
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v10.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC731457
(Tic-Visit
:proposal-id 12658
:visit-id "10"
:proposal-version -1
:trans-version "20110509"
:date "28-Jun-2011 08:55:57.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "10"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2923
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v11.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC749237
(Tic-Visit
:proposal-id 12658
:visit-id "11"
:proposal-version -1
:trans-version "20110509"
:date "06-Jul-2011 08:43:27.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "11"
:obset-id "11"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "11"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2923
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
true
1
0
/Users/research/proposals/hst/cycle19/shield/phase2/apt/OP-cache/shield-v12.xml
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
AGC749241
(Tic-Visit
:proposal-id 12658
:visit-id "12"
:proposal-version -1
:trans-version "20110509"
:date "06-Jul-2011 08:48:42.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12658
:visit-id "12"
:obset-id "12"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12658
:visit-id "12"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2923
:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
true
1
0