11655( 7) - 21-Jul-2008 15:49:37 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11655 Version: 7 Check-in Time: 21-Jul-2008 15:49:37 STScI Edit Number: 5 Title Dynamics of the Galactic bulge/bar ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Konrad Kuijken Universiteit Leiden CoI: Mr. Mario Soto Universiteit Leiden N CoI: Dr. R. Michael Rich University of California - Los Angeles N ------------------------------------------------------------------------------------ Abstract We request second-epoch ACS observations of four star fields in the Galactic bar. These will allow us to measure proper motions for tens of thousands of stars well below the turnoff, to construct a dynamical model for the bulge/bar (in combination with data already in hand from other HST fields, and from VLT spectroscopy), and hence to take a unique look at the internal dynamical structure of the central regions of our Galaxy. By relating the kinematics with stellar population we can elucidate the formation history of the bulge and bar, and their relation to the surrounding Galactic disk. This is a resubmission of an approved Cycle 15 proposal that was hit by the ACS malfunction. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to reobserve four fields in the far side (negative longitude) of the Galactic bar. We obtained first-epoch F814W images for these fields in 2003 as part of our cycle 12 proposal (in which we also completed the 2nd epoch observations for our fields in the near side of the bar). With the data requested here we will complete the HST imaging portion of the project, and will have proper motion data in hand for 11 bulge/bar fields, covering the full extent of the bar. We will have at least 10, 000 stars per field. Astrometric accuracy is crucial, and we will follow the methodology of our earlier work (Kuijken \& Rich 2002, based on Anderson \& King 2000): a mix of short and long, dithered exposures such that we can correct accurately for sub-pixel position uncertainties. Per field we require one orbit for five (3$\times$7.5 minutes and 2$\times$1 minute) F814W exposures. A second orbit for each field is required for similar exposures in F555W: these data will not be used for proper motion measurements (there being no equivalent first epoch) but the resulting colour-magnitude diagram will be used for photometric parallax measurements so that the kinematics can be related to distance down the line of sight (Kuijken \& Rich 2002). The proper motion accuracy we have been able to achieve with WFPC2 images over a 6-year baseline is better than 1mas/yr (equivalent to 30 km/s at the distance to the bulge), in spite of the poor sampling offered by the WF chips. The key to achieving this accuracy was to observe in F814W, which has the widest PSF of the broad bands, and to dither extensively. 11655( 7) - 21-Jul-2008 15:49:37 - [ 2] We request a final orbit for an F814W-only observation of Baade's window. This field has been observed roughly every three years since 1994, and this final epoch will further improve the astrometric accuracy there. More importantly, it will enable us to cross check in detail the accuracies of proper motions derived from WFPC2/WFPC2, WFPC2/ACS and ACS/ACS combinations. Our total request is thus for nine orbits, covering 5 fields. NOTE on ORIENT values chosen: In order to optimize the overlap with the first-epoch data, we have specified four possible ORIENT ranges for each field (multiples of 90 degrees, $\pm2$, from the first-epoch observations). The preferred value, which corresponds to the first epoch observations, is given in the comments field for each visit. All observations are schedulable with full visibility with the ORIENTS chosen. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11655( 7) - 21-Jul-2008 15:49:37 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 FIELD171634- UNIDENTIFIED, BULGE RA=17H16M34.0000S +/- 0.1", J2000 V = 21.0 +/- 5.0 293427 DEC=-29D34'27.00" +/- 0.1" Reference Frame: ICRS Comments: ------------------------------------------------------------------------------------------------------------------------------------ 2 FIELD170715- UNIDENTIFIED, BULGE RA=17H07M15.0000S +/- 0.1", J2000 V = 21.0 +/- 5.0 330243 DEC=-33D02'43.00" +/- 0.1" Reference Frame: ICRS Comments: ------------------------------------------------------------------------------------------------------------------------------------ 3 FIELD180506- UNIDENTIFIED, BULGE RA=18H05M6.0000S +/- 0.1", J2000 V = 21.0 +/- 5.0 355410 DEC=-35D54'10.00" +/- 0.1" Reference Frame: ICRS Comments: ------------------------------------------------------------------------------------------------------------------------------------ 4 FIELD175623- UNIDENTIFIED, BULGE RA=17H56M23.0000S +/- 0.1", J2000 V = 21.0 +/- 5.0 385613 DEC=-38D56'13.00" +/- 0.1" Reference Frame: ICRS Comments: ------------------------------------------------------------------------------------------------------------------------------------ 5 FIELD180310- UNIDENTIFIED, BULGE RA=18H03M9.3723S +/- 0.1", J2000 V = 21.0 +/- 5.0 295129 DEC=-29D51'42.35" +/- 0.1" Reference Frame: ICRS Comments: ------------------------------------------------------------------------------------------------------------------------------------ 11655( 7) - 21-Jul-2008 15:49:37 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing .1825 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 11655( 7) - 21-Jul-2008 15:49:37 - [ 5] Visit: 01 Visit Requirements: ORIENT 77.470490D TO 77.470490 D On Hold Comments: Additional Comments: field 1716 Preferred ORIENT is 77.5 Alternate ORIENTs may be added only if preferred ORIENT is not possible: 75-80, 165-170, 255-260, 345-350. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 FIELD171634 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 50 S PATTERN 2 1 -293427 ------------------------------------------------------------------------------------------------------------------------------------ 2 FIELD171634 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 371 S PATTERN 1 2 -293427 ------------------------------------------------------------------------------------------------------------------------------------ 3 FIELD171634 ACS/WFC ACCUM WFC F555W CR-SPLIT=NO, GAIN=2.0 1 50 S PATTERN 2 3 -293427 ------------------------------------------------------------------------------------------------------------------------------------ 4 FIELD171634 ACS/WFC ACCUM WFC F555W CR-SPLIT=NO, GAIN=2.0 1 416 S PATTERN 1 4 -293427 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ FIELD171634-293427 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD171634-293427 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD171634-293427 2 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD171634-293427 2 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD171634-293427 2 ACS/WFC ACCUM WFC F814W 3 none none none 1 N/A FIELD171634-293427 2 ACS/WFC ACCUM WFC F814W 4 none none none 1 N/A FIELD171634-293427 3 ACS/WFC ACCUM WFC F555W 1 none none none 2 N/A FIELD171634-293427 3 ACS/WFC ACCUM WFC F555W 2 none none none 2 N/A FIELD171634-293427 4 ACS/WFC ACCUM WFC F555W 1 none none none 2 N/A FIELD171634-293427 4 ACS/WFC ACCUM WFC F555W 2 none none none 2 N/A FIELD171634-293427 4 ACS/WFC ACCUM WFC F555W 3 none none none 2 N/A FIELD171634-293427 4 ACS/WFC ACCUM WFC F555W 4 none none none 2 N/A 11655( 7) - 21-Jul-2008 15:49:37 - [ 6] Visit: 02 Visit Requirements: ORIENT 64.755707D TO 64.755707 D On Hold Comments: Additional Comments: field 1707 Preferred ORIENT is 64.8 Alternate ORIENTs may be added only if preferred ORIENT is not possible: 63-67, 153-157, 243-247, 333-337. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 FIELD170715 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 50 S PATTERN 2 1 -330243 ------------------------------------------------------------------------------------------------------------------------------------ 2 FIELD170715 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 375 S PATTERN 1 2 -330243 ------------------------------------------------------------------------------------------------------------------------------------ 3 FIELD170715 ACS/WFC ACCUM WFC F555W CR-SPLIT=NO, GAIN=2.0 1 50 S PATTERN 2 3 -330243 ------------------------------------------------------------------------------------------------------------------------------------ 4 FIELD170715 ACS/WFC ACCUM WFC F555W CR-SPLIT=NO, GAIN=2.0 1 420 S PATTERN 1 4 -330243 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ FIELD170715-330243 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD170715-330243 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD170715-330243 2 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD170715-330243 2 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD170715-330243 2 ACS/WFC ACCUM WFC F814W 3 none none none 1 N/A FIELD170715-330243 2 ACS/WFC ACCUM WFC F814W 4 none none none 1 N/A FIELD170715-330243 3 ACS/WFC ACCUM WFC F555W 1 none none none 2 N/A FIELD170715-330243 3 ACS/WFC ACCUM WFC F555W 2 none none none 2 N/A FIELD170715-330243 4 ACS/WFC ACCUM WFC F555W 1 none none none 2 N/A FIELD170715-330243 4 ACS/WFC ACCUM WFC F555W 2 none none none 2 N/A FIELD170715-330243 4 ACS/WFC ACCUM WFC F555W 3 none none none 2 N/A FIELD170715-330243 4 ACS/WFC ACCUM WFC F555W 4 none none none 2 N/A 11655( 7) - 21-Jul-2008 15:49:37 - [ 7] Visit: 03 Visit Requirements: ORIENT 81.496399D TO 81.496399 D On Hold Comments: Additional Comments: field 1805 Preferred ORIENT is 81.5 Alternate ORIENTs may be added only if preferred ORIENT is not possible: 79-84, 169-174, 259-264, 349-354. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 FIELD180506 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 50 S PATTERN 2 1 -355410 ------------------------------------------------------------------------------------------------------------------------------------ 2 FIELD180506 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 382 S PATTERN 1 2 -355410 ------------------------------------------------------------------------------------------------------------------------------------ 3 FIELD180506 ACS/WFC ACCUM WFC F555W CR-SPLIT=NO, GAIN=2.0 1 50 S PATTERN 2 3 -355410 ------------------------------------------------------------------------------------------------------------------------------------ 4 FIELD180506 ACS/WFC ACCUM WFC F555W CR-SPLIT=NO, GAIN=2.0 1 427 S PATTERN 1 4 -355410 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ FIELD180506-355410 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD180506-355410 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD180506-355410 2 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD180506-355410 2 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD180506-355410 2 ACS/WFC ACCUM WFC F814W 3 none none none 1 N/A FIELD180506-355410 2 ACS/WFC ACCUM WFC F814W 4 none none none 1 N/A FIELD180506-355410 3 ACS/WFC ACCUM WFC F555W 1 none none none 2 N/A FIELD180506-355410 3 ACS/WFC ACCUM WFC F555W 2 none none none 2 N/A FIELD180506-355410 4 ACS/WFC ACCUM WFC F555W 1 none none none 2 N/A FIELD180506-355410 4 ACS/WFC ACCUM WFC F555W 2 none none none 2 N/A FIELD180506-355410 4 ACS/WFC ACCUM WFC F555W 3 none none none 2 N/A FIELD180506-355410 4 ACS/WFC ACCUM WFC F555W 4 none none none 2 N/A 11655( 7) - 21-Jul-2008 15:49:37 - [ 8] Visit: 04 Visit Requirements: ORIENT 20D TO 24 D; ORIENT 110D TO 114 D On Hold Comments: Additional Comments: field 1756 Preferred ORIENT is 22 Alternate ORIENTs may be added only if preferred ORIENT is not possible: 20-24, 110-114, 200-204, 290-294. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 FIELD175623 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 50 S PATTERN 2 1 -385613 ------------------------------------------------------------------------------------------------------------------------------------ 2 FIELD175623 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 382 S PATTERN 1 2 -385613 ------------------------------------------------------------------------------------------------------------------------------------ 3 FIELD175623 ACS/WFC ACCUM WFC F555W CR-SPLIT=NO, GAIN=2.0 1 50 S PATTERN 2 3 -385613 ------------------------------------------------------------------------------------------------------------------------------------ 4 FIELD175623 ACS/WFC ACCUM WFC F555W CR-SPLIT=NO, GAIN=2.0 1 427 S PATTERN 1 4 -385613 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ FIELD175623-385613 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD175623-385613 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD175623-385613 2 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD175623-385613 2 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD175623-385613 2 ACS/WFC ACCUM WFC F814W 3 none none none 1 N/A FIELD175623-385613 2 ACS/WFC ACCUM WFC F814W 4 none none none 1 N/A FIELD175623-385613 3 ACS/WFC ACCUM WFC F555W 1 none none none 2 N/A FIELD175623-385613 3 ACS/WFC ACCUM WFC F555W 2 none none none 2 N/A FIELD175623-385613 4 ACS/WFC ACCUM WFC F555W 1 none none none 2 N/A FIELD175623-385613 4 ACS/WFC ACCUM WFC F555W 2 none none none 2 N/A FIELD175623-385613 4 ACS/WFC ACCUM WFC F555W 3 none none none 2 N/A FIELD175623-385613 4 ACS/WFC ACCUM WFC F555W 4 none none none 2 N/A 11655( 7) - 21-Jul-2008 15:49:37 - [ 9] Visit: 05 Visit Requirements: ORIENT 38D TO 42 D; ORIENT 128D TO 132 D; ORIENT 218D TO 222 D; ORIENT 308D TO 312 D On Hold Comments: Additional Comments: Baade Window Preferred ORIENT is 40 Alternate ORIENTs may be added only if preferred ORIENT is not possible: 38-42, 128-132, 218-222, 308-312. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 FIELD180310 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 50 S PATTERN 2 1 -295129 ------------------------------------------------------------------------------------------------------------------------------------ 2 FIELD180310 ACS/WFC ACCUM WFC F814W CR-SPLIT=NO, GAIN=2.0 1 371 S PATTERN 1 2 -295129 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ FIELD180310-295129 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD180310-295129 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD180310-295129 2 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A FIELD180310-295129 2 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A FIELD180310-295129 2 ACS/WFC ACCUM WFC F814W 3 none none none 1 N/A FIELD180310-295129 2 ACS/WFC ACCUM WFC F814W 4 none none none 1 N/A 11655( 7) - 21-Jul-2008 15:49:37 - [ 10] Summary Form for Proposal 11655 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, GAIN=2.0 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 110D TO 114 D, ORIENT 128D TO 132 D, ORIENT 20D TO 24 D, ORIENT 218D TO 222 D, ORIENT 308D TO 312 D, ORIENT 38D TO 42 D, ORIENT 64.755707D TO 64.755707 D, ORIENT 77.470490D TO 77.470490 D, ORIENT 81.496399D TO 81.496399 D, PATTERN 1 2, PATTERN 1 4, PATTERN 2 1, PATTERN 2 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names FIELD170715-330243, FIELD171634-293427, FIELD175623-385613, FIELD180310-295129, FIELD180506-355410 ------------------------------------------------------------------------------------------------------------------------------------