12877( 2) - 05-Jul-2012 17:01:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12877 Version: 2 Check-in Time: 05-Jul-2012 17:01:42 STScI Edit Number: 0 Title Exposing the Maffei Group ------------------------------------------------------------------------------------ Type Cycle GO 20 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Igor D. Karachentsev Russian Academy of Sciences, Special Y Astrophysical Obs. CoI: Dr. R. Brent Tully University of Hawaii N CoI: Dr. Andrew Dolphin Raytheon Company N CoI: Dr. Dmitry Makarov Russian Academy of Sciences, Special N Astrophysical Obs. CoI: Dr. Lidia Makarova Russian Academy of Sciences, Special N Astrophysical Obs. CoI: Dr. Luca Rizzi California Association for Research in N Astronomy (CARA) CoI: Dr. Margarita Sharina Russian Academy of Sciences, Special N Astrophysical Obs. CoI: Dr. Edward J. Shaya University of Maryland N ------------------------------------------------------------------------------------ Abstract Accurate distances can be determined for nearby galaxies from the luminosities of stars at the Tip of the Red Giant Branch (TRGB). There is now detailed information on the distribution of galaxies within 4 Mpc at high Galactic latitudes. Radial velocities are known to a few km/s from HI observations and distance measurement with 6% accuracy permit the parsing of peculiar velocities from the cosmic expansion at the level of 15 km/s. Dynamic models of the region within 4 Mpc are becoming increasingly sophisticated with the result that our understanding of the distribution of matter is increasingly detailed. However there is a problem. The greatest tidal influence on the Local Group comes from the Maffei - IC342 complex at low Galactic latitudes and its members are heavily obscured. We need to know the distances and masses of the members of this complex in order to accurately reconstruct the orbital history and map the mass distribution of the Local Group. There has been limited success studying the Maffei region with observations shortward of 1 micron but accurate distances can be obtained with observations in the infrared. The TRGB is extremely bright in the infared and obscuration is not such a problem. Three important and heavily obscured objects requiring two orbits each will be observed with WFC3/IR through the F110W and F160W filters. Parallel observations with ACS through the F814W and F606W filters will contribute to an accurate measurement of line-of-sight extinction. ------------------------------------------------------------------------------------ Observations Description ------------------------ Three principal and highly obscured galaxies in the nearest group: Maffei 1, Maffei 2, and IC 342 will be observed simultaneously with WFC3/IR as primary and ACS/WFC in parallel with two orbits each. The exposures times will be divided between F110W and F160W filters with account for obscuration. We are 12877( 2) - 05-Jul-2012 17:01:42 - [ 2] guided by the exposure times used in the course of program SNAP 11719 (PI Dalcanton) with galaxies at similar distances, though less obscured. All three the galaxies are large, having extinction corrected Holmberg diameters within 12 - 30 arcminutes. We point the WFC3/IR camera about 5-6 arcmin away from the galaxy center in each case. Position of the ACS on the galaxy body may be chosen more or less arbitrary, simply avoiding crowded HII-regions in the galaxy as well as bright foreground stars. We follow dithering procedures demonstrated to be optimal for psf reconstruction. The photometry is carried out with the software DOLPHOT, the successor to HSTPHOT (Dolphin 2000), enhanced to be used with WFC3 data. Calibration of the TRGB in the F110W filter is carried out using archival data from SNAP 11719 observations, using the same F110W and F160W filters. Parallel observations of adjacent fields will be made with ACS through the F814W and F606W filters. The color displacement of the Zero Age Main Sequence will be used to determine the reddening in the line-of-sight. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12877( 2) - 05-Jul-2012 17:01:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 MAFFEI-1 GALAXY, ELLIPTICAL RA=02H36M50.8561S +/- 0.1", J2000 V = 13.47 DEC=+59D41'30.08" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 2 MAFFEI-2 GALAXY, AMORPHOUS RA=02H42M19.0298S +/- 0.1", J2000 V = 14.77 IRREGULAR, SPIRAL DEC=+59D34'34.63" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 8 IC-0342 GALAXY, SPIRAL RA=03H47M54.1069S +/- 0.1", J2000 V = 9.37 DEC=+67D56'53.86" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 12877( 2) - 05-Jul-2012 17:01:42 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.636 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12877( 2) - 05-Jul-2012 17:01:42 - [ 5] Visit: 01 Visit Requirements: SCHED 100%; ORIENT 270D TO 90 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MAFFEI-1 WFC3/IR MULTIAC IR F110W NSAMP=7, SAMP-SEQ=SPARS100 1 DEF PATTERN 3 1-2; PAR 2 CUM WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC1 F606W 1 490 S see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MAFFEI-1 1 WFC3/IR MULTIAC IR F110W 1 none none none 1 N/A CUM MAFFEI-1 1 WFC3/IR MULTIAC IR F110W 2 none none none 1 N/A CUM MAFFEI-1 1 WFC3/IR MULTIAC IR F110W 3 none none none 1 N/A CUM MAFFEI-1 1 WFC3/IR MULTIAC IR F110W 4 none none none 1 N/A CUM ANY 2 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 425.0 S ANY 2 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F606W 3 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F606W 4 none none none 1 507.0 S 12877( 2) - 05-Jul-2012 17:01:42 - [ 6] Visit: 02 Visit Requirements: SCHED 100%; SAME ORIENT AS 01 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MAFFEI-1 WFC3/IR MULTIAC IR F160W NSAMP=7, SAMP-SEQ=SPARS100 1 DEF PATTERN 3 1-2; PAR 2 CUM WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC1 F814W 1 490 S see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MAFFEI-1 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM MAFFEI-1 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM MAFFEI-1 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM MAFFEI-1 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM ANY 2 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 425.0 S ANY 2 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F814W 3 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F814W 4 none none none 1 507.0 S 12877( 2) - 05-Jul-2012 17:01:42 - [ 7] Visit: 03 Visit Requirements: SCHED 100%; ORIENT 120D TO 20 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MAFFEI-2 WFC3/IR MULTIAC IR F110W NSAMP=7, SAMP-SEQ=SPARS100 1 DEF PATTERN 3 1-2; PAR 2 CUM WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC1 F606W 1 490 S see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MAFFEI-2 1 WFC3/IR MULTIAC IR F110W 1 none none none 1 N/A CUM MAFFEI-2 1 WFC3/IR MULTIAC IR F110W 2 none none none 1 N/A CUM MAFFEI-2 1 WFC3/IR MULTIAC IR F110W 3 none none none 1 N/A CUM MAFFEI-2 1 WFC3/IR MULTIAC IR F110W 4 none none none 1 N/A CUM ANY 2 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 425.0 S ANY 2 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F606W 3 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F606W 4 none none none 1 507.0 S 12877( 2) - 05-Jul-2012 17:01:42 - [ 8] Visit: 04 Visit Requirements: SCHED 100%; SAME ORIENT AS 03 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MAFFEI-2 WFC3/IR MULTIAC IR F160W NSAMP=7, SAMP-SEQ=SPARS100 1 DEF PATTERN 3 1-2; PAR 2 CUM WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC1 F814W 1 490 S see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MAFFEI-2 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM MAFFEI-2 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM MAFFEI-2 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM MAFFEI-2 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM ANY 2 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 425.0 S ANY 2 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F814W 3 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F814W 4 none none none 1 507.0 S 12877( 2) - 05-Jul-2012 17:01:42 - [ 9] Visit: 05 Visit Requirements: SCHED 100%; ORIENT 180D TO 30 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IC-0342 WFC3/IR MULTIAC IR F110W NSAMP=7, SAMP-SEQ=SPARS100 1 DEF PATTERN 3 1-2; PAR 2 CUM WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC1 F606W 1 490 S see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IC-0342 1 WFC3/IR MULTIAC IR F110W 1 none none none 1 N/A CUM IC-0342 1 WFC3/IR MULTIAC IR F110W 2 none none none 1 N/A CUM IC-0342 1 WFC3/IR MULTIAC IR F110W 3 none none none 1 N/A CUM IC-0342 1 WFC3/IR MULTIAC IR F110W 4 none none none 1 N/A CUM ANY 2 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 425.0 S ANY 2 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F606W 3 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F606W 4 none none none 1 507.0 S 12877( 2) - 05-Jul-2012 17:01:42 - [ 10] Visit: 06 Visit Requirements: SCHED 100%; SAME ORIENT AS 05 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IC-0342 WFC3/IR MULTIAC IR F160W NSAMP=7, SAMP-SEQ=SPARS100 1 DEF PATTERN 3 1-2; PAR 2 CUM WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC1 F814W 1 490 S see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IC-0342 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM IC-0342 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM IC-0342 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM IC-0342 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM ANY 2 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 425.0 S ANY 2 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F814W 3 none none none 1 507.0 S ANY 2 ACS/WFC ACCUM WFC1 F814W 4 none none none 1 507.0 S 12877( 2) - 05-Jul-2012 17:01:42 - [ 11] Summary Form for Proposal 12877 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=7, SAMP-SEQ=SPARS100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 120D TO 20 D, ORIENT 180D TO 30 D, ORIENT 270D TO 90 D, PAR 2 WITH 1, PATTERN 3 1-2, SAME ORIENT AS 01, SAME ORIENT AS 03, SAME ORIENT AS 05, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ANY, IC-0342, MAFFEI-1, MAFFEI-2 ------------------------------------------------------------------------------------------------------------------------------------