Resubmitted version, as requested, starting with existing STScI version of Phase II. Changed MIRRORB to MIRRORA in Visit 03, and set buffer times equal to exposure times for all COS primary exposures. ----- Attempting Submission 3 (Wed May 06 14:34:24 GMT 2009) ----- Should be okay. The Gaseous Corona of M31 We propose to obtain ultraviolet spectroscopy of the halo of M31, to probe for a hot corona on scales of 30-40 pc from the galaxy. We seek to obtain absorption line spectra of O I, Mg II, Si II, C IV, and Si IV toward bright QSOs located behind the galaxy. One of the sightlines falls on the projection of Ibata's giant stream. All background sources have been vetted with GALEX photometry and are therefore bright enough for observation. If hot gas is detected with this initial study, we will endeavor to use a grid of background sources to map the structure and kinematics of this gas in detail. M31 is the nearest major spiral galaxy for which such a study can be undertaken, other than our own Milky Way. Recent studies find a substantial population of HI high velocity clouds at distances form M31 of up to 50 kpc, and there is well documented evidence of disrupted satellites and tidal streams. These observations will shed light on the hot gaseous halo of M31, but also will help in interpreting QSO sightlines at high redshift.
G130M and G160M will be used to observe NV 1238, 1242; SiIV 1393, 1402; and CIV 1548, 1550. Exposure times and expected S/N levels are provided in the exposure comments. Buffer times are all longer than 1 orbit, which facilitates parallel exposures with ACS/WFC and WFC3/UVIS. We will use the ACS F606W and F814W filters, and the WFC3 F475W and F814W to provide shallow imaging of three fields in the M31 halo. ISM IN EXTERNAL GALAXIES 12 false 0.0 0.0 false false false false false SUPPORTED GALAXY NUCLEUS NUV(AB)=16.7, FUV(AB)=16.9 J2000 00 48 18.9800 +39 41 11.60 J2000 GALAXY NUCLEUS NUV(AB)=17.3, FUV(AB)=17.4 J2000 01 01 31.1600 +42 29 35.40 J2000 GALAXY NUCLEUS NUV(AB)=18.2, FUV(AB)=18.4 J2000 00 36 22.9000 +43 16 40.00 J2000 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G160M 1600 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G160M 1600 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G160M 1600 ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F814W The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /var/tmp/OPVisit17794.xml (Tic-Visit :proposal-id 11632 :visit-id "01" :proposal-version -1 :trans-version "20090130" :date "06-May-2009 10:31:13.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2465904 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11632 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11632 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3000 :al-overhead-at-end 103 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11632 :visit-id "01" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3111 :al-overhead-at-end 111 :internal-dur-at-end 1447 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) true 2 1 Exposure time is 24 seconds per dwell for S/N=40 with MIRRORB. Too bright for MIRRORA. Nomalized to GALEX NUV magnitude = 16.7 in ETC. Exposure time is 24 seconds for S/N=40 with MIRRORB. Too bright for MIRRORA. Nomalized to GALEX NUV magnitude = 16.7 in ETC. Exposure yields S/N=16 at NV 1240, and S/N=12 at SiIV 1400 for GALEX(FUV)=16.9. ETC buffer time of 3023 sec set to 2350 sec, which should be okay. Parallel with COS prime Parallel with COS prime Parallel with COS prime Parallel with COS prime Using central wavelength of 1577 allows both SiIV and CIV to be observed. Exposure yields S/N=15 at CIV 1550, and S/N=17 at SiIV 1400 for GALEX(FUV)=16.9. ETC buffer time of 6574 sec set to 3000 sec. Parallel with COS prime Parallel with COS prime Parallel with COS prime Parallel with COS prime The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /var/tmp/OPVisit17793.xml (Tic-Visit :proposal-id 11632 :visit-id "02" :proposal-version -1 :trans-version "20090130" :date "06-May-2009 10:29:57.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2465904 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11632 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11632 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3041 :al-overhead-at-end 110 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11632 :visit-id "02" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3151 :al-overhead-at-end 111 :internal-dur-at-end 1447 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3351 :pcs-gap 0 ) true 2 1 Exposure time is 32 seconds per dwell for S/N=35 with MIRRORB. Too bright for MIRRORA. Nomalized to GALEX NUV magnitude = 17.3 in ETC. Exposure time is 32 seconds for S/N=35 with MIRRORB. Too bright for MIRRORA. Nomalized to GALEX NUV magnitude = 16.7 in ETC. Exposure yields S/N=13 at NV 1240, and S/N=10 at SiIV 1400 for GALEX(FUV)=17.4. ETC buffer time of 3692 sec set to 2400 sec. Parallel with COS prime Parallel with COS prime Parallel with COS prime Parallel with COS prime Using central wavelength of 1577 allows both SiIV and CIV to be observed. Exposure yields S/N=11 at CIV 1550, and S/N=12 at SiIV 1400 for GALEX(FUV)=17.4. ETC buffer time of 10008 sec set to 3000 sec. Parallel with COS prime Parallel with COS prime Parallel with COS prime Parallel with COS prime The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /var/tmp/OPVisit17795.xml (Tic-Visit :proposal-id 11632 :visit-id "03" :proposal-version -1 :trans-version "20090130" :date "06-May-2009 10:31:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 4914320 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11632 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11632 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3018 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11632 :visit-id "03" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3153 :al-overhead-at-end 3 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11632 :visit-id "03" :orbit-number 3 :pcs-time 195 :si-vis-utilization 3151 :al-overhead-at-end 31 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11632 :visit-id "03" :orbit-number 4 :pcs-time 195 :si-vis-utilization 3151 :al-overhead-at-end 5 :internal-dur-at-end 1447 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3351 :pcs-gap 0 ) true 4 0 Exposure time is 10 seconds per dwell for S/N=40 with MIRRORA. Nomalized to GALEX NUV magnitude = 18.2 in ETC. Exposure time is 10 seconds for S/N=40 with MIRRORA. Nomalized to GALEX NUV magnitude = 18.2 in ETC. Exposure yields S/N=9 at NV 1240, and S/N=7 at SiIV 1400 for GALEX(FUV)=18.2. ETC buffer time of 4600 sec set to 2500 sec. Parallel with COS prime Parallel with COS prime Parallel with COS prime Parallel with COS prime Using central wavelength of 1577 allows both SiIV and CIV to be observed. Exposure yields S/N=8 at CIV 1550, and S/N=9 at SiIV 1400 for GALEX(FUV)=18.2. ETC buffer time of 18732 sec set to 3100 sec. Parallel with COS prime Parallel with COS prime Parallel with COS prime Parallel with COS prime Using central wavelength of 1577 allows both SiIV and CIV to be observed. Exposure yields S/N=9 at CIV 1550, and S/N=10 at SiIV 1400 for GALEX(FUV)=18.2. ETC buffer time of 18732 sec set to 3100 sec. Parallel with COS prime Parallel with COS prime Parallel with COS prime Parallel with COS prime Using central wavelength of 1577 allows both SiIV and CIV to be observed. Exposure yields S/N=9 at CIV 1550, and S/N=10 at SiIV 1400 for GALEX(FUV)=18.2. ETC buffer time of 18732 sec set to 3100 sec. Parallel with COS prime Parallel with COS prime Parallel with COS prime Parallel with COS prime