Assigned ID: 149 ----- Attempting Submission 1 (Thu Feb 25 17:09:45 GMT 2010) ----- ----- Attempting Submission 1 (Wed Jul 07 18:33:47 GMT 2010) ----- Low redshift damped Lyman alpha systems selected by 21cm absorption: A new route to high efficiency? The identification of z<1.6 damped Lyman alpha (DLA) systems requires UV spectroscopy, but blind surveys are less than 10% efficient at finding them, making low z DLA surveys unpalatable for precious HST resources. Pre-selecting QSOs which exhibit strong intervening MgII absorption has increased the detection effiency to 35%. However, the last survey for low z DLAs was carried out 8 years ago and (combined with previous archival data) still only yielded 41 DLAs, compared to ~1000 known systems at z>2. In this proposal, we aim to test a new selection technique, whereby we pre-select DLA candidates towards radio-loud QSOs which exhibit both MgII absorption AND 21cm absorption in optical and radio spectra respectively We expect this technique to be close to 100% efficient, but UV spectroscopy is the final step in the proof of concept. In this short pilot proposal we will observe five 21cm absorbers to confirm their DLA nature and pave the way for larger samples in the future. These data will also yield 5 new temperature measurements of the ISM in the 1<z<1.7 "redshift desert" where only 1 previous measurement exists, hence providing a 6-fold improvement and immediate science return, in addition to establishing the success of the technique.
This program aims to observe QSOs in order to obtain spectra covering the lyman alpha transition at redshifts 1<z<1.5. Target S/N values are around 10 (or more) per resolution element. For each target 2 FP-POS values (3 and 4) are used. Coordinates are taken from the GSC2 and therefore ACQ/IMAGE is used in the acquisition (according to updated acquisition information). Buffer times are set to be equal to exposure times. QUASAR ABSORPTION LINES AND IGM 12 false 0.0 0.0 false false false false false false SUPPORTED EXT-MEDIUM DAMPED LYMAN ALPHA CLOUD Target coords taken from GSC2 (GSC2 name given as alternate) NUV=18.8 S03O003189 J2000 01 08 26.8416 -00 37 24.17 J2000 EXT-MEDIUM DAMPED LYMAN ALPHA CLOUD Target coords taken from GSC2 (GSC2 name given as alternate) NUV=19.8 N9E3015563 J2000 08 04 42.2000 +30 12 37.00 J2000 EXT-MEDIUM DAMPED LYMAN ALPHA CLOUD Target coords taken from GSC2 (GSC2 name given as alternate) NUV=20.7 S8YZ003012 J2000 14 32 57.6912 -18 01 35.26 J2000 EXT-MEDIUM DAMPED LYMAN ALPHA CLOUD Target coords taken from GSC2 (GSC2 name given as alternate) N3MJ008735 J2000 16 23 46.2000 +07 18 55.00 J2000 EXT-MEDIUM DAMPED LYMAN ALPHA CLOUD Target coords taken from GSC2 (GSC2 name given as alternate) NUV=20.7 SB34001938 J2000 23 58 10.8816 -10 20 8.63 J2000 COS/NUV Spectroscopic No No G230L 2950 COS/NUV Spectroscopic No No G230L 2635 COS/NUV Spectroscopic No No G230L 2950 COS/NUV Spectroscopic No No G230L 2950 COS/NUV Spectroscopic No No G230L 2635 /sara/home/sara/PROPS/HST_C18_21cm/OP-cache/phase2-v01.xml The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit to observe Lyman alpha in absorption at z=1.37, so the feature is at 2881 A. (Tic-Visit :proposal-id 12214 :visit-id "01" :proposal-version -1 :trans-version "20100505" :date "30-Jun-2010 10:18:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "32" :si-bright-earth-limb-angle 20.0 :data-volume 174016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12214 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12214 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2891 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3234 :pcs-gap 0 ) true 1 0 /sara/home/sara/PROPS/HST_C18_21cm/OP-cache/phase2-v02.xml The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit to observe Lyman alpha in absorption at z=1.19, so the feature is at 2662 A. (Tic-Visit :proposal-id 12214 :visit-id "02" :proposal-version -1 :trans-version "20100505" :date "30-Jun-2010 10:23:28.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "32" :si-bright-earth-limb-angle 20.0 :data-volume 174016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12214 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12214 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2932 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3053 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 2 0 /sara/home/sara/PROPS/HST_C18_21cm/OP-cache/phase2-v03.xml The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit to observe Lyman alpha in absorption at z=1.33, so the feature is at 2833 A. (Tic-Visit :proposal-id 12214 :visit-id "03" :proposal-version -1 :trans-version "20100505" :date "30-Jun-2010 10:28:26.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "32" :si-bright-earth-limb-angle 20.0 :data-volume 408832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12214 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12214 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2906 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3249 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3027 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3249 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "03" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3027 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3249 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "03" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3027 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3249 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "03" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3027 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3249 :pcs-gap 0 ) true 5 0 /sara/home/sara/PROPS/HST_C18_21cm/OP-cache/phase2-v04.xml The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit to observe Lyman alpha in absorption at z=1.34, so the feature is at 2845 A. (Tic-Visit :proposal-id 12214 :visit-id "04" :proposal-version -1 :trans-version "20100505" :date "30-Jun-2010 11:15:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "32" :si-bright-earth-limb-angle 20.0 :data-volume 330560 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12214 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12214 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2899 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3242 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3020 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3242 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "04" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3020 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3242 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "04" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3020 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3242 :pcs-gap 0 ) true 4 0 /sara/home/sara/PROPS/HST_C18_21cm/OP-cache/phase2-v05.xml The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit to observe Lyman alpha in absorption at z=1.17, so the feature is at 2638 A. (Tic-Visit :proposal-id 12214 :visit-id "05" :proposal-version -1 :trans-version "20100505" :date "30-Jun-2010 11:18:41.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "32" :si-bright-earth-limb-angle 20.0 :data-volume 330560 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12214 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12214 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2902 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3245 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "05" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3023 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3245 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "05" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3023 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3245 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12214 :visit-id "05" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3023 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3245 :pcs-gap 0 ) true 4 0