13408( 4) - 14-Aug-2013 13:16:16 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13408 Version: 4 Check-in Time: 14-Aug-2013 13:16:16 STScI Edit Number: 0 Title Constraining the Physical Properties of LBV Nebulae in the Galactic Center Environment ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jon Mauerhan University of California - Berkeley Y CoI: Dr. Nathan Smith University of Arizona N ------------------------------------------------------------------------------------ Abstract The Galactic center (GC) is the most extreme site of massive star formation in the Galaxy, owing to the unusually dense reservoir of molecular gas that comprises the central ~500 pc. As a result, the region contains several massive starburst clusters and largest known concentration of ultra-rare luminous blue variable (LBV) stars, unstable hot supergiants experiencing super-Eddington eruptions that hurl massive nebulae into space and deliver copious amounts of mechanical energy to the ISM. Of particular interest, there are several extraordinary hot supergiants in the GC whose massive expanding LBV nebulae afford us the opportunity to study the evolution of such structures in the unique GC environment, where the dense ISM, extreme UV field, and ferocious ambient stellar winds are expected to have significant influence over the morphological evolution of LBV mass ejections. We propose to diagnose the physical properties of known LBV nebulae in the GC by measuring the morphology and mass of their warm gas component and its physical relation to the photo-ionized component. To achieve this, we will perform WFC3 narrowband imaging of collisionally-ionized [FeII] emission and photo-ionized HI (Paschen-beta). The imaging will be supplemented with ground-based spectroscopy, which will provide the chemical and kinematical information neccessary to derive the physical properties of the nebulae from the WFC3 images. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will be obtaining narrowband images of three emission-line nebulae in the Galactic center region with WFC3/IR in the F164N (FeII line) and F167N (continuum) filters. The targets are named 'Pistol', 'G0.120-0.048', and 'WR102ka'. Images in the F128N (Paschen-beta line) and F130N (continuum) filters will also be obtained for WR102ka only. The stellar fields in the Galactic center are extremely crowded. Our goal is to subtract off stellar continuum images from the emission-line images so that the nebulae can be isolated from the crowded field stars and studied in detail. Each target will be observed using the WFC3-IR-DITHER-LINE-3PT pattern. The dither pattern provides ample improvement of the PSF for our purposes, and allows for effective removal of hot pixels and cosmic rays. The MULTIACCUM STEP50/NSAMP=13 exposure parameters will be used for the F164N/F167N imaging, which achieves our required signal-to-noise and allows the dither sequences to pack neatly into 1 orbit for each object; for the F128N/F130N images of 13408( 4) - 14-Aug-2013 13:16:16 - [ 2] WR102ka, we will use STEP200/NSAMP=14 for the same reasons. For the Pistol and G0.120-0.048 fields, both of which contain multiple targets of interest, we require specific roll angles (between 255 and 271 deg) in order to include all sources of interest in the image frame. There is no roll angle restriction for WR 102ka. Fine guidance is a firm requirement, so multiple guide stars should be selected carefully (make sure the stars are single). Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13408( 4) - 14-Aug-2013 13:16:16 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PISTOL STAR, EMISSION LINE RA=17H46M15.0220S, J2000 V = 30 +/- 5 K=7.3 NEBULA DEC=-28D49'20.41" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 G0.120-0.048 STAR, EMISSION LINE RA=17H46M5.7860S, J2000 V = 30 +/- 5 K=9.5 NEBULA DEC=-28D51'25.66" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 3 WR102KA STAR, EMISSION LINE RA=17H46M18.1200S, J2000 V = 30 +/- 5 K=8.8 NEBULA DEC=-29D01'36.60" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 13408( 4) - 14-Aug-2013 13:16:16 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER DITHER Number_Of_Points 2 4 Point_Spacing 5.183 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 18.528 Angle_Between_Sides 74.653 Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ 13408( 4) - 14-Aug-2013 13:16:16 - [ 5] Visit: 01 Visit Requirements: PCS MODE FINE; ORIENT 255D TO 271 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PISTOL WFC3/IR MULTIAC IR-FIX F164N NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 3 1 CUM (1196.93 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PISTOL WFC3/IR MULTIAC IR-FIX F167N NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 3 2 CUM (1196.93 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ PISTOL 1 WFC3/IR MULTIAC IR-FIX F164N 1 none none none 1 N/A CUM PISTOL 1 WFC3/IR MULTIAC IR-FIX F164N 2 none none none 1 N/A CUM PISTOL 1 WFC3/IR MULTIAC IR-FIX F164N 3 none none none 1 N/A CUM PISTOL 1 WFC3/IR MULTIAC IR-FIX F164N 4 none none none 1 N/A CUM PISTOL 2 WFC3/IR MULTIAC IR-FIX F167N 1 none none none 1 N/A CUM PISTOL 2 WFC3/IR MULTIAC IR-FIX F167N 2 none none none 1 N/A CUM PISTOL 2 WFC3/IR MULTIAC IR-FIX F167N 3 none none none 1 N/A CUM PISTOL 2 WFC3/IR MULTIAC IR-FIX F167N 4 none none none 1 N/A CUM 13408( 4) - 14-Aug-2013 13:16:16 - [ 6] Visit: 02 Visit Requirements: PCS MODE FINE; ORIENT 255D TO 271 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 G0.120-0.04 WFC3/IR MULTIAC IR-FIX F164N NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 3 1 8 CUM (1196.93 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 G0.120-0.04 WFC3/IR MULTIAC IR-FIX F167N NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 3 2 8 CUM (1196.93 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ G0.120-0.048 1 WFC3/IR MULTIAC IR-FIX F164N 1 none none none 1 N/A CUM G0.120-0.048 1 WFC3/IR MULTIAC IR-FIX F164N 2 none none none 1 N/A CUM G0.120-0.048 1 WFC3/IR MULTIAC IR-FIX F164N 3 none none none 1 N/A CUM G0.120-0.048 1 WFC3/IR MULTIAC IR-FIX F164N 4 none none none 1 N/A CUM G0.120-0.048 2 WFC3/IR MULTIAC IR-FIX F167N 1 none none none 1 N/A CUM G0.120-0.048 2 WFC3/IR MULTIAC IR-FIX F167N 2 none none none 1 N/A CUM G0.120-0.048 2 WFC3/IR MULTIAC IR-FIX F167N 3 none none none 1 N/A CUM G0.120-0.048 2 WFC3/IR MULTIAC IR-FIX F167N 4 none none none 1 N/A CUM 13408( 4) - 14-Aug-2013 13:16:16 - [ 7] Visit: 03 Visit Requirements: PCS MODE FINE 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WR102KA WFC3/IR MULTIAC IR-FIX F164N NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 3 1 CUM (1196.93 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WR102KA WFC3/IR MULTIAC IR-FIX F167N NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 3 2 CUM (1196.93 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WR102KA WFC3/IR MULTIAC IR-FIX F128N NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 4 3 CUM (2393.86 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WR102KA WFC3/IR MULTIAC IR-FIX F130N NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 4 4 CUM (2393.86 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WR102KA WFC3/IR MULTIAC IR-FIX F128N SAMP-SEQ=STEP50, NSAMP=11 1 DEF PATTERN 3 5-6 CUM (1196.93 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WR102KA WFC3/IR MULTIAC IR-FIX F130N SAMP-SEQ=STEP50, NSAMP=11 1 DEF CUM (1196.93 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WR102KA 1 WFC3/IR MULTIAC IR-FIX F164N 1 none none none 1 N/A CUM WR102KA 1 WFC3/IR MULTIAC IR-FIX F164N 2 none none none 1 N/A CUM WR102KA 1 WFC3/IR MULTIAC IR-FIX F164N 3 none none none 1 N/A CUM WR102KA 1 WFC3/IR MULTIAC IR-FIX F164N 4 none none none 1 N/A CUM WR102KA 2 WFC3/IR MULTIAC IR-FIX F167N 1 none none none 1 N/A CUM WR102KA 2 WFC3/IR MULTIAC IR-FIX F167N 2 none none none 1 N/A CUM 13408( 4) - 14-Aug-2013 13:16:16 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ WR102KA 2 WFC3/IR MULTIAC IR-FIX F167N 3 none none none 1 N/A CUM WR102KA 2 WFC3/IR MULTIAC IR-FIX F167N 4 none none none 1 N/A CUM WR102KA 3 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 2 N/A CUM WR102KA 3 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 2 N/A CUM WR102KA 3 WFC3/IR MULTIAC IR-FIX F128N 1 3 none none 2 N/A CUM WR102KA 3 WFC3/IR MULTIAC IR-FIX F128N 1 4 none none 2 N/A CUM WR102KA 3 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 2 N/A CUM WR102KA 3 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 2 N/A CUM WR102KA 3 WFC3/IR MULTIAC IR-FIX F128N 2 3 none none 2 N/A CUM WR102KA 3 WFC3/IR MULTIAC IR-FIX F128N 2 4 none none 2 N/A CUM WR102KA 4 WFC3/IR MULTIAC IR-FIX F130N 1 1 none none 3 N/A CUM WR102KA 4 WFC3/IR MULTIAC IR-FIX F130N 1 2 none none 3 N/A CUM WR102KA 4 WFC3/IR MULTIAC IR-FIX F130N 1 3 none none 3 N/A CUM WR102KA 4 WFC3/IR MULTIAC IR-FIX F130N 1 4 none none 3 N/A CUM WR102KA 4 WFC3/IR MULTIAC IR-FIX F130N 2 1 none none 3 N/A CUM WR102KA 4 WFC3/IR MULTIAC IR-FIX F130N 2 2 none none 3 N/A CUM WR102KA 4 WFC3/IR MULTIAC IR-FIX F130N 2 3 none none 3 N/A CUM WR102KA 4 WFC3/IR MULTIAC IR-FIX F130N 2 4 none none 3 N/A CUM WR102KA 5 WFC3/IR MULTIAC IR-FIX F128N 1 none none none 4 N/A CUM WR102KA 5 WFC3/IR MULTIAC IR-FIX F128N 2 none none none 4 N/A CUM WR102KA 5 WFC3/IR MULTIAC IR-FIX F128N 3 none none none 4 N/A CUM WR102KA 5 WFC3/IR MULTIAC IR-FIX F128N 4 none none none 4 N/A CUM WR102KA 6 WFC3/IR MULTIAC IR-FIX F130N 1 none none none 4 N/A CUM WR102KA 6 WFC3/IR MULTIAC IR-FIX F130N 2 none none none 4 N/A CUM 13408( 4) - 14-Aug-2013 13:16:16 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ WR102KA 6 WFC3/IR MULTIAC IR-FIX F130N 3 none none none 4 N/A CUM WR102KA 6 WFC3/IR MULTIAC IR-FIX F130N 4 none none none 4 N/A CUM 13408( 4) - 14-Aug-2013 13:16:16 - [ 10] Summary Form for Proposal 13408 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=11, SAMP-SEQ=STEP50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 255D TO 271 D, PATTERN 3 1, PATTERN 3 2, PATTERN 3 5-6, PATTERN 4 3, PATTERN 4 4, PCS MODE FINE ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F128N, F130N, F164N, F167N ------------------------------------------------------------------------------------------------------------------------------------ Target Names G0.120-0.048, PISTOL, WR102KA ------------------------------------------------------------------------------------------------------------------------------------