----- Submission 1 (Tue May 10 21:00:27 GMT 2005) ----- Phase II Proposal 10576 (mgii_snap_phaseII) successfully submitted. ----- Submission 2 (Tue Aug 02 22:04:03 GMT 2005) ----- Phase II Proposal 10576 (mgii_snap_phaseII) successfully submitted. ----- Submission 3 (Wed Aug 10 16:25:52 GMT 2005) ----- I have made required changes to the pattern used in this proposal, but have not rerun Visit Planner for all the visits -- I have not changed anything that would alter the results of this calculation and it takes a very long time to complete. Thank you. Unable to contact STScI submission server Assigned ID: 370 ----- Submission 1 (Fri Jan 21 21:02:22 GMT 2005) ----- Phase I Proposal 370 (mgii_snap) successfully submitted. An ACS Imaging Survey of the Galaxies Hosting Strong Mg II Absorption Strong MgII absorbers (with rest-frame absorption equivalent width W_MgII > 0.3 A) at redshift z < 1 are known to arise in extended gaseous halos around luminous galaxies. Detailed absorption line studies based on high-solution spectra of background quasars yield tight constraints on the metallicity, ionization state, and kinematics of the gaseous clouds. But whether they originate in gas accreted from surrounding satellite galaxies or outflows associated with active starburst in the host galaxies remains unclear. We have recently completed a search of the Sloan Digital Sky Survey data archive for strong MgII absorbers and identified over 1000 new systems that are previously unknown. A subset of these MgII absorbers with W_MgII > 1.8 A exhibit extreme kinematics with velocity widths (exceeding 200 km/s) in our follow-up echelle spectra. Their dynamics are consistent with various scenarios that include gas accretion (with speeds exceeding the virial velocity) and starburst outflows (possibly driven by recent merger events). Independent of their exact nature, it is clear that strong MgII systems serve as signposts to galactic halos with extreme gas dynamics. Here we propose to conduct a snapshot survey of galaxies in the fields toward high-redshift quasars with known, strong MgII absorbers at 0.5 < z < 2. We plan to obtain high spatial-resolution ACS/WFC images of 60 fields to uncover galaxies fainter than L* at the redshifts of these absorbers and study their morphology. We will complement the HST observations with follow-up spectroscopic observations and IR images acquired at the Keck and Magellan Observatories to for redshift identifications and for measuring broad-band colors. We will investigate the correlation between absorption line kinematics and galaxy morphology. In particular, we will address whether on-going mergers is responsible for the extreme dynamics observed in MgII absorption based on their rest-frame ultraviolet morphology.
We have selected a sample of 60 quasars which exhibit strong Mg II absorption (Equivalent Width, Wr > 1.8 Ang) in the redshift range 0.5 < z < 2.0 from the sample of Prochter, Prochaska, & Burles, 2005, which was drawn from the SDSS DR3. We have broken the redshift range into three bins, selecting 20 systems per bin. Assuming a snapshot yield of ~ 50%, this ensures our ability to study both the individual galaxies and any evolution in their population with redshift. The objects were also chosen to represent as wide a range in RA as possible and to have quasar r-band luminosities of 18 < mag < 19. The magnitude restriction was made to ensure that the quasar would be a dim as possible in the imaging field without sacrificing our ability to collect efficient, high-resolution follow-up spectroscopy. We will image the field of each of the targets listed in this proposal using the WFC detector of the ACS instrument on HST. We have chosen to use the SDSS set filters F475W, F625W, and F814W for the low, middle, and high redshift Mg II targets, respectively. This choice of filters allows for both high throughput observations and rest-frame ~3000 Ang images of the targets in each redshift bin. It is our expectation that the spectral energy distributions of these galaxies are roughly flat and that the slight differences in rest wavelength will have little effect on interpration. These observations will allow us to probe impact parameters of ~1.15 Mpc at z=0.5 and ~1.58 Mpc at z=2.0. Because Mg II absorption host galaxies have typical impact parameters of ~40 kpc from the line-of-sight of their associated quasars, we are confident that these fields will contain the host galaxies. One of the goals of this survey is to determine the luminosity function of the strong Mg II systems. At present, therefore, it is difficult to predict their luminosities. Referring to the results of the few systems which have been imaged to date (Steidel et al.\ 2002), they found L ~ L* with a minimum luminosity of L = L*/3 for their weakest Mg II (Wr = 0.08 Ang). To calculate observation times we have made several assumptions. First we wish to be sensitive to galaxies at the 5-sigma level to L/L* ~ 0.5, and that such galaxies will subtend one square arcsecond in area. For a 5-simga result, we therefore require a S/N ratio of 0.49 per 2x2 pixel box. Employing the ACS ETC we have determined the exposure times need to acheive these results for a variety of redshifts, reflecting the overall redshift distribution of our targets. The results of these calculations indicate that relatively little exposure time is needed to adequitely image our low-redshift targets, ~90 seconds, with high-redshift targets requiring ~1000 seconds. However, to most efficiently use each telescope visit, we are requesting 700s total exposure for our low- and intermediate-redshift targets and 1200s for our high-redshift systems. While we will not be able to obtain uniform depth with redshift, these exposure times ensure that our observations will be sufficiently deep for all our targets, and any surreptitious galaxies observed in our low- and intermediate-redshift target fields are of interest and will be followed up upon, so the time will be far from wasted. To deal with cosmic rays, CCD 'hot-spots', and the inter-CCD 'gap', each visit is split into two exposures separated by a slight telescope slew. For each galaxy resolved in our imaging, and employing public source-extraction packages (e.g. GIM2D; Simard et al. 2002, ApJ Supp, 142, 1), we will be able to determine such morphilogical parameters as asymmetry, inclinations, disk/bulge ratios, and clumpiness. 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