0 Assigned ID: 730 ----- Attempting Submission 1 (Fri Apr 07 18:42:50 GMT 2017) ----- HST Phase I Proposal 730 (3C196-draft12.apt) successfully submitted. Receipt: # 730-1 ----- Attempting Submission 2 (Fri Apr 07 19:05:37 GMT 2017) ----- 0 ----- Attempting Submission 1 (Thu Jul 20 16:22:41 GMT 2017) ----- Interstellar dust grains play a critical role in the formation of stars, and significantly impact the evolution and appearance of distant galaxies. High redshift studies must account for this dust. Dust grains in the Milky Way are predominately carbonaceous and silicate, each of which produces unique spectral signatures in the extinction curve. In distant galaxies, the composition of dust grains and the relative amount of silicate and carbonaceous dust can be studied using the extinction curves along luminous background quasar sightlines produced by gas-rich foreground absorbers. Our previous work suggests that dust grains in distant galaxies are often more silicate-rich than in the Milky Way, but that the dust may be predominately silicate or carbonaceous along a sightline. We predict that silicate-poor, dusty DLAs should be rich in carbonaceous dust, and exhibit a relatively strong 2175 A bump. To test this hypothesis, we propose G230L/430L STIS spectra covering the 2175 A bump in the dusty z=0.437 DLA toward 3C 196, which is hosted in a barred spiral galaxy with (super-) solar metallicity. We expect to find a significant 2175 A bump in this system, like in the dusty but silicate-poor z=0.524 DLA toward AO 0235+164. Combining the proposed data with archival spectra will yield an extinction curve extending from the FUV to the IR, for comparison with local galaxies. The results of this test will significantly inform our models about the distribution of dust grain populations and the dichotomy between carbonaceous and silicate dust grains, and address whether moderate redshift dust in spiral galaxies does differ from the Milky Way, in preparation for planned JWST studies. We will obtain 5 orbits with the STIS/MAMA/G230L grating and 1 orbit with the STIS/G430L grating to span the spectral range from 1570-5700 Angstroms with a S/N per spectral resolution element of ~10 at the center of the (rest-frame) 2175 Angstrom feature. In the observed frame, this feature in the z=0.437 DLA will be centered at 3125.5 Angstroms. Due to the detrimental effects of CTE in the STIS CCD for the exposure times of 1000 seconds or less, and since we are observing a point source and the full slit length is not needed, we use the 52"x0.2"E1 pseudo-aperture for our G430L observation, to place the target closer to the readout amplifier. For the G230L science exposures, we have used 2-point dither patterns along the slit with step sizes of 1.0", 1.5", 2.0", 2.5", and 3.0", to prevent the spectra in different orbits from falling on the same part of the detector. We have used a 3-point dither pattern with smaller step sizes of 0.5" for the G430L observations, due to our proximity to the slit edge. Galaxies and the IGM 0 false true false true false false SUPPORTED GALAXY LYMAN ALPHA CLOUD QSO This object was generated by the targetselector and retrieved from the SIMBAD database. The coordinates were updated using the 2MASS All-Sky Point Source Catalog (PSC). The redshift of the QSO was taken from NED. J2000 J2000 SDSS uAB=18.941 The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. STIS/NUV-MAMA Spectroscopic No No G230L 2376 The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. STIS/CCD Spectroscopic No No G430L 4300 POS-TARG DITHER 1.5 LINE false false 2 90.0 STIS-ALONG-SLIT 1 false POS-TARG DITHER 2.0 LINE false false 2 90.0 STIS-ALONG-SLIT 2 false POS-TARG DITHER 2.5 LINE false false 2 90.0 STIS-ALONG-SLIT 3 false POS-TARG DITHER 3.0 LINE false false 2 90.0 STIS-ALONG-SLIT 4 false POS-TARG DITHER 1.0 LINE false false 2 90.0 STIS-ALONG-SLIT 5 false POS-TARG DITHER 0.5 LINE false false 3 90.0 STIS-ALONG-SLIT 6 false 1500407447197 /Users/moniquealler/Desktop/HST-3C196/phase2-3C196/OP-cache/15092-preSUBMIT-v01.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. We have verified, using the BOT, that there are no bright objects (i.e. no objects flagged as health/safety concerns) in the field. 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CASM was run in Phase II mode. We have verified, using the BOT, that there are no bright objects (i.e. no objects flagged as health/safety concerns) in the field. (Tic-Visit :proposal-id 15092 :visit-id "02" :proposal-version -1 :trans-version "20170613" :date "18-Jul-2017 15:51:27.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 313584 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15092 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15092 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3012 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3345 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15092 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3123 :al-overhead-at-end 0 :internal-dur-at-end 375 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3345 :pcs-gap 0 ) true 2 0 1500414244292 /Users/moniquealler/Desktop/HST-3C196/phase2-3C196/OP-cache/15092-preSUBMIT-v03.xml The scheduling data was generated by CASM 25.2. 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