0Assigned ID: 526
----- Attempting Submission 1 (Fri Apr 10 15:53:56 GMT 2015) -----
HST Phase I Proposal 526 (gallart_small_guys.apt) successfully submitted.
Receipt: # 526-1
----- Attempting Submission 2 (Fri Apr 10 23:07:48 GMT 2015) -----
HST Phase I Proposal 526 (gallart_small_guys.apt) successfully submitted.
Receipt: # 526-2I know the Hydra II orbit can still be done best, because it wold be better to have
two parallel images in each band, and I suspect this can be accomplished by using
the WFPC3 as primary camera, and the ACS as parallel, and calculating the pointing
and orientation angle for the primary observations so that the actual target is on the
ACS parallel. However, this is far from trivial, also because some roll angles led to not
schedulable visits. So I prefer to submit as this now, and try to seek a better solution
after the deadline, if this is possible.-2126242305----- Attempting Submission 1 (Thu Jul 23 13:05:56 GMT 2015) -----The lowest mass galaxies with extended star formation history: a new cosmological challengeDwarf galaxies are the most numerous type of galaxies in the present-day Universe. They are thought to be the first galaxies to form and the basic building-blocks of larger galaxies. They are thus, key astrophysical objects for understanding the most common mode of galaxy formation and how they relate to the build-up of larger structures in the Universe.
The faintest dwarf galaxies that have been discovered in the Local Group (the so-called ultra-faint dwarfs, UFD) have been shown to contain similar ancient populations, which could indicate that star formation in the smallest sub-halos was suppressed by a global outside influence such as cosmic reionization. This conclusion, however, is severely challenged by the recently discovered Hydra II and Eridanus II UFD, which ground-based color-magnitude diagrams show clear indications of the presence of an intermediate-age, or even, young population, like in a third UFD, Leo T. The goal of this proposal is to determine the complete star formation history of the only three (known so far) UFD galaxies that present an extended period of star formation. We will determine whether they began forming stars before or after the reionization. For that we will obtain deep color-magnitude diagrams and derive star formation histories with an exquisite age resolution (< 1 Gyr at old ages).
The proposed observations will place strong constraints on the formation mechanisms of the faintest galaxies in the Universe, on their subsequent evolution, and on the conditions of the early Universe. This will have important implications for our understanding of galaxy formation and evolution in general.For this project, three galaxies are observed in both ACS and WFPC3/UVIS
Leo T is observed for 6 orbits, all time is spent in F814W in both cameras. This is because there is the necessary amount of F606W exposure time in the archive, for program 12914, and more exposure time in the same band will be added for program 13770. In this case, we intend to match closely the observing strategy of that program, in terms of central pointing, orientation angle, and some of the dithers. Each orbit is split in two exposures with each camera, organized in two visits of three orbits each. We obtain only long exposures because some short exposures in F814W have been obtained in program 12914, and even the brightest stars in the galaxy are not saturated in the long exposures available for F606W in program 12914.
For Eridanus II, we divide the total available exposure time almost evenly in F475W and F814W. The 6 available orbits are organized in 2 visits of 3 orbits each. We require the same orient in all the orbits. In orbit 1 of each visit, we obtain one long exposure in each filter. In orbits two and three, we obtain one long exposure in one of the filters and one short and one long in the other, in order to be able to obtain photometry of the brightest stars in the RGB.
For Hydra II we have only one orbit available. Two dithered images of the same lenght are taken in each F475W and F814W.RESOLVED STELLAR POPULATIONS12falsefalsefalsefalseSUPPORTEDGALAXYAMORPHOUS IRREGULARYESThis object was generated by the targetselector and retrieved from the SIMBAD database.J2000J2000GALAXYAMORPHOUS IRREGULARJ2000J2000GALAXYAMORPHOUS IRREGULARJ2000J2000ACS/WFCImagingNoNoF814WWFC3/UVISImagingNoNoF814WACS/WFCImagingNoNoF814WACS/WFCImagingNoNoF475WWFC3/UVISImagingNoNoF475WWFC3/UVISImagingNoNoF814WACS/WFCImagingNoNoF814WACS/WFCImagingNoNoF475WWFC3/UVISImagingNoNoF475WWFC3/UVISImagingNoNoF814W/Users/carme/Dropbox/trabajo/c23phaseii/OP-cache/14224_all_prim_acs-v01.xmlThe scheduling data was generated by CASM 23.2.CASM was run in Phase II mode.We are requesting the same orientation angle as the one in which observations of program 12914 have been taken (278.982 degrees, which is also the same orientation in which observations of program 13770 will be taken) in order to match the fields as closely as possible.(Tic-Visit
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