0Assigned ID: 1706
----- Attempting Submission 1 (Fri Mar 01 20:00:14 GMT 2013) -----
HST Phase I Proposal 1706 (hs1700c21.apt) successfully submitted.
----- Attempting Submission 2 (Fri Mar 01 20:21:12 GMT 2013) -----Note comments about guide star selection for this observation under the target section (this information has also been emailed to the program contact)..
cut 5 minutes from 5 visits, 1, 2, 5, 8, and 11400795898----- Attempting Submission 1 (Tue Jun 11 04:17:52 GMT 2013) -----
----- Attempting Submission 2 (Fri Mar 14 16:55:26 GMT 2014) -----Inefficient ordering of FP-SPLIT positions will not waste any time because the movement of the OSM will occur during occultation (we will use one FP position per orbit).Directly Probing >10^6 K Gas in Lyman Limit Absorbers at z > 2The ultraviolet spectrum of the QSO HS1700+6416 (z_qso = 2.736) is remarkable - this spectrum reveals "partial" Lyman limit absorption at six different redshifts ranging from z = 1.1573 to 2.4331. Despite these absorption systems, the QSO is relatively bright in the HST band and provides a unique opportunity to study extreme ultraviolet absorption lines at rest wavelengths < 500 A. We propose to obtain high S/N, high-resolution COS spectroscopy of this QSO to characterize the hot gas in the circumgalactic media traced by the six Lyman limit absorbers as well as other systems along the line of sight. We will search for 15 ions that trace gas at log T > 6 (e.g., MgIX, SiXII, SXIV, FeXVI, and others) to gain insight on the missing baryons, the "hidden" mass of hot gas in galactic outflows and halos, and the relationships between the hot and cool gas phases in circumgalactic gaseous media. In addition to the Lyman limit systems, the sight line also pierces the intracluster media of two lower redshift X-ray bright clusters at an impact parameter near the cluster virial radii, as well as a high-redshift protocluster at z = 2.3. ACS and WFC3 imaging and IR grism spectroscopy of galaxies near the sight line have already been obtained, and a large sample of galaxy redshifts have been measured for objects at z > 2. Consequently, the proposed COS spectrum will have many archival uses beyond our primary science goals.We will obtain high S/N, high-resolution COS spectroscopy of the QSO HS1700+6416 with the G130M grating. This target has been observed successfully many times with HST, although some care must be exercised in the selection of the guide stars (see comments under the target section of the Phase II proposal). The coordinates of this point source are accurately known, so we will acquire the target with the COS-NUV channel using ACQ/IMAGE. To choose the acquistion setup and calculate exposure times for the ACQ/IMAGE sequence, we have uploaded a previous STIS NUV spectrum of HS1700+6416 into the COS ETC. Previous observations indicate that the QSO flux can vary by ~20%, so the acquisition exposure time was selected to provide S/N = 40 even if the QSO exhibits its faintest known flux at the time of the observations, but we have checked to ensure that the observation is safe for the COS detector even if it is in its brightest known state. For this program, attaining the highest possible signal-to-noise is of paramount importance, so to provide the best ability to sense and correct for fixed-pattern noise, we will observe the QSO at three different central wavelengths (1309, 1318, and 1327 A) of the G130M grating, and we will record exposures with all four FP-SPLIT positions at each central wavelength. This strategy has the additional advantage that it fills in the G130M detector gap. The bright-object protection check in the APT flags the HS1700+6416 target acquisition with MIRRORA as a bright-object concern, but the UV flux is low enough so that the target is well below the local count-rate limit for the COS detectors. To establish this (and to check the science exposures as well), we have used the ETC to check global and local count rates using previous FUV and NUV spectra obtained with HST as well as the GALEX FUV and NUV magnitudes, and we have allowed for 20% variability; we also note that HS1700+6416 has been successfully observed with COS in program 11528 with the same target acquisition set up (including MIRRORA).QUASAR ABSORPTION LINES AND IGMDefaultfalsetruefalsefalsefalseSUPPORTEDEXT-MEDIUMABSORPTION LINE SYSTEM - EXTRAGALACTICCORONAL GASIGMThis target has often been observed successfully with HST, but there have also been multiple failed observations (see, e.g., program 11528). The following communication from Amber Armstrong to David Syphers summarizes findings following failed acquisitions for prog.11528:
Hello David,
It is my professional opinion that this field will pose problems anytime specific guide stars are not chosen. I have read that magnitudes of GSC2 stars are anywhere from 0.5-0.8 fainter than expected in this field and that will cause the FGS sensors to fail to lock on to a majority of the guide stars available. Therefore, we have determined (as a result of 11528) that we will change the faint limit of all 3 FGSs to 12.2 (for this target only) which will assure that only the Hipparchos observed stars are used. I would definitely recommend anyone observing this target inform their PC or equivalent right away of past failures and request that only guide stars that have been successful in the past be used during this exposure. For your information, I will list the guide stars and the FGS sensor used to successfully lock on to this target in the past (11528 visit 23)
N4EY000036 on FGS2
N4EY000102 on FGS3
These were successful at a U3 nominal roll at 62.7 degrees. Any PC should be able to find this information in our archives and HOPR reports, but I had to dig to find it so I'll make it available here. At this point, I intend to use these guide stars for your observation.
Cheers,
Amber ArmstrongHS1700+6416J2000J2000F(1300) = 2.5e-15, F(2000) = 1.0e-15, GALEX FUV = 18.2, GALEX NUV = 18.1COS/FUVSpectroscopicNoNoG130M1309COS/FUVSpectroscopicNoNoG130M1327The scheduling data was generated by CASM 21.2.CASM was run in Phase II mode.(Tic-Visit
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:visit-id "07"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
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:orbit-number 5
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
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:dark-offset NIL
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:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)true50ACQ/IMAGE exposure time calculated by uploading a previous STIS G230L spectrum into the COS target acquisition exposure time calculator. The target has been observed many times with HST, and the UV flux appears to vary by ~20%. The requested acquistion time will provide S/N = 40 (see ETC COS.ta.509793) if it is at its faintest known level. If it is at its brightest known level, it is still safe for COS (brightest pixel = 25.1 counts/sec).The scheduling data was generated by CASM 21.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13491
:visit-id "08"
:proposal-version -1
:trans-version "20130502"
:date "10-Jun-2013 23:02:31.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 5
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 356704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13491
:visit-id "08"
:obset-id "08"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13491
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:max-dark-utilization 1920
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:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
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:pcs-time 222
:si-vis-utilization 3289
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:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "08"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "08"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "08"
:orbit-number 5
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 433
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)false50ACQ/IMAGE exposure time calculated by uploading a previous STIS G230L spectrum into the COS target acquisition exposure time calculator. The target has been observed many times with HST, and the UV flux appears to vary by ~20%. The requested acquistion time will provide S/N = 40 (see ETC COS.ta.509793) if it is at its faintest known level. If it is at its brightest known level, it is still safe for COS (brightest pixel = 25.1 counts/sec).The scheduling data was generated by CASM 21.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13491
:visit-id "09"
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:trans-version "20130502"
:date "10-Jun-2013 23:02:22.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 5
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 356704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13491
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13491
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:pcs-time 333
:si-vis-utilization 3166
:al-overhead-at-end 0
:internal-dur-at-end 95
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
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:pcs-time 222
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:al-overhead-at-end 0
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:dark-offset NIL
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:max-dark-utilization 1920
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:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
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:orbit-number 3
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
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:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "09"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "09"
:orbit-number 5
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 433
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)true50ACQ/IMAGE exposure time calculated by uploading a previous STIS G230L spectrum into the COS target acquisition exposure time calculator. The target has been observed many times with HST, and the UV flux appears to vary by ~20%. The requested acquistion time will provide S/N = 40 (see ETC COS.ta.509793) if it is at its faintest known level. If it is at its brightest known level, it is still safe for COS (brightest pixel = 25.1 counts/sec).The scheduling data was generated by CASM 21.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13491
:visit-id "10"
:proposal-version -1
:trans-version "20130502"
:date "10-Jun-2013 23:05:38.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 5
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 356704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13491
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13491
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:orbit-number 1
:pcs-time 333
:si-vis-utilization 3166
:al-overhead-at-end 0
:internal-dur-at-end 95
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "10"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "10"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "10"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "10"
:orbit-number 5
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 433
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)true50ACQ/IMAGE exposure time calculated by uploading a previous STIS G230L spectrum into the COS target acquisition exposure time calculator. The target has been observed many times with HST, and the UV flux appears to vary by ~20%. The requested acquistion time will provide S/N = 40 (see ETC COS.ta.509793) if it is at its faintest known level. If it is at its brightest known level, it is still safe for COS (brightest pixel = 25.1 counts/sec).The scheduling data was generated by CASM 21.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13491
:visit-id "11"
:proposal-version -1
:trans-version "20130502"
:date "10-Jun-2013 23:22:57.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 5
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 356704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13491
:visit-id "11"
:obset-id "11"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13491
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:orbit-number 1
:pcs-time 333
:si-vis-utilization 3166
:al-overhead-at-end 0
:internal-dur-at-end 95
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:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "11"
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:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "11"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "11"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "11"
:orbit-number 5
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 433
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)false50ACQ/IMAGE exposure time calculated by uploading a previous STIS G230L spectrum into the COS target acquisition exposure time calculator. The target has been observed many times with HST, and the UV flux appears to vary by ~20%. The requested acquistion time will provide S/N = 40 (see ETC COS.ta.509793) if it is at its faintest known level. If it is at its brightest known level, it is still safe for COS (brightest pixel = 25.1 counts/sec).The scheduling data was generated by CASM 21.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13491
:visit-id "12"
:proposal-version -1
:trans-version "20130502"
:date "10-Jun-2013 23:24:29.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 5
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 356704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13491
:visit-id "12"
:obset-id "12"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13491
:visit-id "12"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 3166
:al-overhead-at-end 0
:internal-dur-at-end 95
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "12"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "12"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "12"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13491
:visit-id "12"
:orbit-number 5
:pcs-time 222
:si-vis-utilization 3289
:al-overhead-at-end 0
:internal-dur-at-end 433
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)true50ACQ/IMAGE exposure time calculated by uploading a previous STIS G230L spectrum into the COS target acquisition exposure time calculator. The target has been observed many times with HST, and the UV flux appears to vary by ~20%. The requested acquistion time will provide S/N = 40 (see ETC COS.ta.509793) if it is at its faintest known level. If it is at its brightest known level, it is still safe for COS (brightest pixel = 25.1 counts/sec).