0 Assigned ID: 713 ----- Attempting Submission 1 (Fri Apr 10 19:35:37 GMT 2015) ----- HST Phase I Proposal 713 (HST_Cycle23_2175bump.apt) successfully submitted. Receipt: # 713-1 ----- Attempting Submission 2 (Fri Apr 10 22:31:18 GMT 2015) ----- SAME POS MAY NOT BE APPROPRIATE SAME POS MAY NOT BE APPROPRIATE 0 ----- Attempting Submission 1 (Tue Jul 21 19:37:43 GMT 2015) ----- HST Phase II Proposal 14200 (PhaseII.apt) successfully submitted. Receipt: # 14200-1 ----- Attempting Submission 2 (Wed Jul 22 16:42:24 GMT 2015) ----- ----- Attempting Submission 3 (Fri Dec 04 18:03:10 GMT 2015) ----- ----- Attempting Submission 4 (Mon Jan 11 17:07:17 GMT 2016) ----- The direct imaging is used for wavelength calibration for the grism spectra. They should be at the same position. Revealing the host galaxy of a strong Milky Way-type 2175 Angstrom absorber at z = 2.12 We propose WFC3/IR G141 grism and F140W direct imaging observations (3 orbits) of a strong Milky Way-type 2175 Angstrom absorbing galaxy at z = 2.12 in the quasar spectrum towards QSO J1211+0833 from the Sloan Digital Sky Survey (SDSS). We conducted follow up observations with the Echelle Spectrograph and Imager (ESI) onboard the Keck-II telescope and the Ultraviolet and Visual Echelle Spectrograph (UVES) on the VLT. Given the simultaneous presence of C I, CO, and the 2175 Angstrom bump, combined with the high metallicity, high dust depletion level and overall low ionization state of the gas, J1211+0833 supports the scenario that the presence of the bump requires an evolved stellar population. We speculate that the host of the J1211+0833 2175 Angstrom bump is likely to be an evolved and chemically-enriched disk galaxy. The proposed observations will enable us to, for the first time, study the properties (morphology, impact parameter, star formation rate, stellar mass) of the host galaxy of a 2175 Angstrom absorber beyond the local Universe, which our existing observational data cannot provide. This population may be used as unique tracers of chemical enrichment and star-forming galaxies at high-redshift. We aim to obtain two-dimensional grism spectra with the WFC3/G141 grism and direct imaging at F140W for wavelength calibration. We will be able to confirm the host galaxy of the absorber using the H-beta and O[III] emission lines. We schedule 3 visits, one visit per orbit. In each orbit/visit, 2 dithered exposures in WFC3/G141 and corresponding direct images at the same position will be taken in the order of direct imaging-> grism->offset->direct imaging->grism. We use POS-TARG offsets to enable rejection of hot/bad pixels and to improve sampling of the PSF. The pattern is: POS-TARG: (0, 0) (1.355, 0.424) pixels: (0, 0) (10.0, 3.5) This is a larger version of the standard WFC3-IR-DITHER-BOX-MIN pattern, which has only 1-2 pixel offsets between pointings. As some bad pixels come in clumps we prefer a slightly larger pattern. No attempt is made to dither over the "dead spot", as large dithers introduce large differential distortion We place no orientation requirements on the first visit to the field. We require the roll angle (i.e. ORIENT) for the second and third visits differ from that of the previous visit by 20 and 160 degrees. The purpose of using different roll angles is to improve our ability to account for contamination by overlapping spectra. QUASAR ABSORPTION LINES AND IGM 12 false false false false SUPPORTED GALAXY QUASAR J2000 J2000 WFC3/IR Spectroscopic No No G141 WFC3/IR Imaging No No F140W /private/var/folders/yv/hjgvzvg51yldz_lcwg7gknl40000gn/T/OPVisit6290403180373832355.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14200 :visit-id "01" :proposal-version -1 :trans-version "20150609" :date "11-Jan-2016 11:59:29.0" :trans-errors '(:WARNINGS 2 :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 678944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14200 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14200 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2837 :al-overhead-at-end 0 :internal-dur-at-end 291 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3213 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 1450991291000 280.0 (Tic-Visit :proposal-id 14200 :visit-id "02" :proposal-version -1 :trans-version "20150609" :date "04-Dec-2015 12:56:49.0" :trans-errors '(:WARNINGS 2 :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 678944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14200 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14200 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2837 :al-overhead-at-end 0 :internal-dur-at-end 291 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3213 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 1447544850000 300.0 (Tic-Visit :proposal-id 14200 :visit-id "03" :proposal-version -1 :trans-version "20150609" :date "04-Dec-2015 12:54:43.0" :trans-errors '(:WARNINGS 2 :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 678944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14200 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14200 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2837 :al-overhead-at-end 0 :internal-dur-at-end 291 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3213 :pcs-gap 0 ) true 1 0