0 Assigned ID: 829 ----- Attempting Submission 1 (Fri Apr 08 21:05:10 GMT 2016) ----- 0 ----- Attempting Submission 1 (Thu Jul 14 20:21:55 GMT 2016) ----- HST Phase II Proposal 14751 (phase2_v1.apt) successfully submitted. Receipt: # 14751-1 ----- Attempting Submission 2 (Tue Jul 19 14:53:50 GMT 2016) ----- HST Phase II Proposal 14751 (phase2_v1.apt) successfully submitted. Receipt: # 14751-2 ----- Attempting Submission 3 (Tue Jul 19 23:08:07 GMT 2016) ----- Resolving Fe-rich Neutral ISM in a Massive Quiescent Galaxy at z~0.4 Roughly 40% of elliptical galaxies are found to contain cool gas but exhibit no on-going star formation, indicating that some feedback mechanisms are at work. While AGN feedback is commonly thought to be responsible for quenching star formation in massive halos, recent work has reiterated the importance of feedback from old stellar populations, including Type Ia supernovae (SNe Ia). In Zahedy et al. (2016), we reported detections of ultra-strong MgII absorption (>3.6 Ang) at 1-2 effective radii of a massive quiescent lensing galaxy at z=0.408. Strong MgII, FeII, MgI, and CaII absorption are found at the lens redshift along two lensed QSO sightlines separated by ~8 kpc. The absorbers are resolved into 15 components with line-of-sight velocity spread of ~600 km/s. The large observed ionic column densities, N>1e14 cm^-2 suggest large neutral hydrogen column densities N(HI)>1e18 cm^-2 and a significant neutral gas fraction. The most striking feature is the uniformly large Fe/Mg ratio across the full 600 km/s velocity range, suggesting a large contribution in chemical enrichment from SNe Ia (>20%). Here we propose QSO absorption-line spectroscopy of this unique system using STIS and the G140L grating with the slit oriented along the two lensed QSOs. The goal is to determine N(HI) from observations of the full Lyman absorption series and gas-phase metallicity of the interstellar medium at two locations separated by ~8 kpc in an elliptical galaxy beyond the local universe. With a modest investment of HST time, we will be able to examine the extent SNe Ia-driven feedback in a distant quiescent galaxy using this unique double-lens system. We will obtain medium-resolution (R~1200) FUV spectra of the two images of the lensed QSO HE0047-1756 using the FUV-MAMA detector and the G140L grating in the Space Telescope Imaging Spectrograph (STIS). The primary goals of the proposed FUV spectroscopic observations are (1) to determine the neutral hydrogen column density, N(HI), and (2) constrain the metallicity of the cool gas found in the ISM of the lensing galaxy. Exposure Time Estimation: Based on our previous experience, we estimate that a signal-to-noise ratio (SNR) of >10 is necessary to place strong constraints on N(HI) and the metallicity of the gas. From GALEX observations of the field around HE 0047-1756, the combined (the two QSO images are unresolved in GALEX) FUV magnitude of the two images is FUV(AB) = 18.50. Using optical flux ratio of image A and B from Wisotzki et al. (2004) of 3.5:1, we estimate that the FUV magnitudes of images A and B of HE0047-1756 are FUV(AB)_A =18.77 and FUV(AB)_B = 20.13, respectively. Since the STIS long-slit mode will allow us to observe both images simultaneously, our exposure time estimate is determined by the required exposure time to reach the desired SNR for the fainter QSO image (image B). Using the latest STIS exposure time calculator with the FOS QSO spectral template redshifted to z_em = 1.676 and scaled to FUV(AB_)B = 20.13, we estimate that a total exposure time of 125 minutes (7.5 ks) is required to reach the desired mean SNR >10 for both QSO images using the G140L grating and the 52"x0.2" long slit. Observing Strategy: The observations will be performed in a single visit consisting of three HST orbits. We plan to observe both images of the lensed QSO HE0047-1756 simultaneously, which requires the STIS long slit to be aligned along the line connecting the two QSO images on the sky. This slit alignment corresponds to HST orientation (ORIENT) angles of 35.49 and 215.49 degrees. We allow a range of +/-0.5 degree in the ORIENT angles, which given the 0.2"-wide long slit, the 1.4" separation of the two QSO images, and the PSF profile of FUV-MAMA will still include more than 90% of the light from both QSO images in the slit. Using the Bright Object Tool, we have confirmed that all bright sources within the aperture are safe for observations with FUV-MAMA. Onboard target acquisition of the brighter QSO image (HE0047-1756A, the listed coordinates of the target) will be performed using STIS/CCD and the F28X50LP filter in the first orbit of the visit. We have confirmed that there is no brighter point source within a 5" radius from HE0047-1756A. Following guide star acquisition and target acquisition (or guide star reacquisition for subsequent orbits), we request 2 sub-exposures for each orbit, corresponding to 2 dither positions of the STIS-ALONG-SLIT dither pattern. To ensure that all spectra taken in different orbits will fall on different areas of the FUV-MAMA detector, we will employ a 6-point dither pattern with a separation of 0.4" between steps. Galaxies 6 false true false false false false SUPPORTED GALAXY GRAVITATIONAL LENS QSO Listed coordinates are for image A (the brighter lensed QSO image). J2000 J2000 est. GALEX FUV(AB) = 18.77 (A), 20.13 (B) GALAXY GRAVITATIONAL LENS QSO Listed coordinates are for image A (the brighter lensed QSO image). J2000 J2000 est. GALEX FUV(AB) = 18.77 (A), 20.13 (B) STIS/FUV-MAMA Spectroscopic No No G140L 1425 POS-TARG DITHER 0.4 LINE false false 6 90.0 STIS-ALONG-SLIT 1 false POS-TARG DITHER 0.4 LINE false false 2 90.0 STIS-ALONG-SLIT 2 false The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. 1480946788000 35.0 (Tic-Visit :proposal-id 14751 :visit-id "01" :proposal-version -1 :trans-version "20160601" :date "18-Jul-2016 23:45:51.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 470160 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14751 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14751 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2887 :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 3221 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14751 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2999 :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 3221 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14751 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2999 :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 3221 :pcs-gap 0 ) false 3 0 /private/var/folders/46/4jpf0wpx40jbz16h87362w240001d2/T/OPVisit8130574237809282153.xml The scheduling data was generated by CASM 25.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14751 :visit-id "02" :proposal-version -1 :trans-version "20170109" :date "07-Feb-2017 10:19:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 157008 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14751 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14751 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2887 :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 3221 :pcs-gap 0 ) false 1 0