This is the last visit of this program, which needs to go in the upcoming calendar.
This is essentially a repeat of visit 8 (same detector configuration and filters),
for a different target, with slightly different dithers.
This target was also observed earlier, so guide stars should not be a problem.----- Attempting Submission 12 (Tue Sep 13 18:59:31 GMT 2011) -----
HST Phase II Proposal 12322 (12322_visit9.apt) successfully submitted.
----- Attempting Submission 13 (Wed Sep 14 02:58:59 GMT 2011) -----
----- Attempting Submission 14 (Tue Oct 11 21:07:13 GMT 2011) -----No errors.Detecting Isolated Black Holes through Astrometric MicrolensingThis proposal aims to make the first detection of isolated stellar-mass black holes (BHs) in the Milky Way, and to determine their masses. Until now, the only directly measured BH masses have come from radial-velocity measurements of X-ray binaries. Our proposed method uses the astrometric shifts that occur when a Galactic-bulge microlensing event is caused by a BH lens. Out of the hundreds of bulge microlensing events found annually by the OGLE and MOA surveys, a few are found to have very long durations (>200 days). It is generally believed that the majority of these long-duration events are caused by lenses that are isolated BHs.
To test this hypothesis, we will carry out high-precision astrometry of 5 long-duration events, using the WFC. The expected astrometric signal from a BH lens is >1.4 mas, at least 7 times the demonstrated astrometric precision attainable with the WFC.
This proposal will thus potentially lead to the first unambiguous detection of isolated stellar-mass BHs, and the first direct mass measurement for isolated stellar-mass BHs through any technique. Detection of several BHs will provide information on the frequency of BHs in the Galaxy, with implications for the slope of the IMF at high masses, the minimum mass of progenitors that produce BHs, and constraints on theoretical models of BH formation.We will select long-duration events which do not show any light contribution from the lens. In addition, the events should have reasonably high amplifications which will ensure that the centroid shift is close to zero at the peak amplification, and will facilitate detection of the parallax signal and hence the distance estimate for the lens. It is easy to identify long-duration events and to determine their time of peak amplification well before the actual peak. Our group includes members of the microlensing survey teams who have access to the survey data for proper selection of such events.
To guard against the possibility that the geometric distortion may be dependeant on the location on the detector; we will position the target at different locations along close-to-central-x-axis of the of the detector.
We will take most images in a single filter, but also take a small number of images in a different filter to check the color dependenacy, if any, of the astrometric shift.
We will try to take as many images as possible in a single ORIENT for better astrometri accuracy. However, maintaining a single ORIENT may not be possible for all the observations. Since almost all of our targets are close to the ecliptic, we plan to use the same orient for nearly half of the year, and then flip it by 180 deg.HOT STARS12false0.00.0falsefalsefalsefalseAVAILABLESTARBULGEGRAVITATIONAL LENSJ2000J2000STARGRAVITATIONAL LENSJ2000J2000STARBULGEGRAVITATIONAL LENSJ2000J2000STARBULGEGRAVITATIONAL LENSJ2000J2000STARGRAVITATIONAL LENSJ2000EXT-STARG V-IVJ2000ACS/HRCImagingNoNoF814WACS/HRCImagingNoNoF555WACS/HRCImagingNoNoF814WACS/HRCImagingNoNoF555WACS/HRCImagingNoNoF814WACS/HRCImagingNoNoF555WACS/HRCImagingNoNoF814WACS/HRCImagingNoNoF555WACS/HRCImagingNoNoF814WACS/HRCImagingNoNoF555WThe scheduling data was generated by CASM 18.1.CASM was run in Phase II mode.128796918600090.0(Tic-Visit
:proposal-id 12322
:visit-id "01"
:proposal-version -1
:trans-version "20100218"
:date "13-Oct-2010 02:06:05.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 844944
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "01"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2871
:al-overhead-at-end 216
:internal-dur-at-end 654
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)false10The scheduling data was generated by CASM 18.1.CASM was run in Phase II mode.128807257500097.41677861343908(Tic-Visit
:proposal-id 12322
:visit-id "02"
:proposal-version -1
:trans-version "20100218"
:date "13-Oct-2010 01:29:02.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1126560
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2451
:al-overhead-at-end 218
:internal-dur-at-end 654
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3275
:pcs-gap 0
)false10The scheduling data was generated by CASM 19.0.CASM was run in Phase II mode.1302668982000270.0(Tic-Visit
:proposal-id 12322
:visit-id "03"
:proposal-version -1
:trans-version "20100902"
:date "30-Mar-2011 14:32:04.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 844944
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "03"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2885
:al-overhead-at-end 216
:internal-dur-at-end 192
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3275
:pcs-gap 0
)false10The scheduling data was generated by CASM 19.0.CASM was run in Phase II mode.1303243899000270.0(Tic-Visit
:proposal-id 12322
:visit-id "04"
:proposal-version -1
:trans-version "20100902"
:date "30-Mar-2011 14:24:36.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 844944
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "04"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2844
:al-overhead-at-end 216
:internal-dur-at-end 654
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)false10The scheduling data was generated by CASM 19.3.CASM was run in Phase II mode.131132914500080.46134928004398(Tic-Visit
:proposal-id 12322
:visit-id "05"
:proposal-version -1
:trans-version "20110509"
:date "07-Jul-2011 07:35:33.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 563088
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "05"
:obset-id "05"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "05"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2367
:al-overhead-at-end 167
:internal-dur-at-end 654
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3275
:pcs-gap 0
)false10The scheduling data was generated by CASM 19.3.CASM was run in Phase II mode.131282086700090.0(Tic-Visit
:proposal-id 12322
:visit-id "06"
:proposal-version -1
:trans-version "20110509"
:date "27-Jul-2011 09:50:33.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 633488
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "06"
:obset-id "06"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "06"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2915
:al-overhead-at-end 167
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)false10The scheduling data was generated by CASM 19.3.CASM was run in Phase II mode.131337034200065.0(Tic-Visit
:proposal-id 12322
:visit-id "07"
:proposal-version -1
:trans-version "20110509"
:date "03-Aug-2011 10:11:20.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 774256
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "07"
:obset-id "07"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "07"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2904
:al-overhead-at-end 167
:internal-dur-at-end 269
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3275
:pcs-gap 0
)false10The scheduling data was generated by CASM 19.3.CASM was run in Phase II mode.131657923100090.0(Tic-Visit
:proposal-id 12322
:visit-id "08"
:proposal-version -1
:trans-version "20110509"
:date "07-Sep-2011 19:10:51.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 633488
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "08"
:obset-id "08"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "08"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2900
:al-overhead-at-end 167
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3275
:pcs-gap 0
)true10The scheduling data was generated by CASM 19.3.CASM was run in Phase II mode.131699882500090.82100474901102(Tic-Visit
:proposal-id 12322
:visit-id "09"
:proposal-version -1
:trans-version "20110509"
:date "13-Sep-2011 22:56:22.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 774256
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "09"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2857
:al-overhead-at-end 167
:internal-dur-at-end 269
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3275
:pcs-gap 0
)true10The scheduling data was generated by CASM 19.3.CASM was run in Phase II mode./private/var/folders/vq/vqHvVK0yGlWAHXOSHPkI9U++4D2/-Tmp-/OPVisit133711820162687214.xml(Tic-Visit
:proposal-id 12322
:visit-id "10"
:proposal-version -1
:trans-version "20110509"
:date "11-Oct-2011 16:58:11.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 422320
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12322
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12322
:visit-id "10"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2589
:al-overhead-at-end 165
:internal-dur-at-end 500
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)true10