14156( 3) - 05-Nov-2015 17:04:16 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14156 Version: 3 Check-in Time: 05-Nov-2015 17:04:16 STScI Edit Number: 0 Title An Ionizing Photon Rate Map of NGC 6946 ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Adam Leroy The Ohio State University Y CoI: Dr. Croxall, Kevin The Ohio State University N CoI: Kathryn Kreckel Max-Planck-Institut fur Astronomie, N Heidelberg CoI: Dr. Eric J. Murphy Jet Propulsion Laboratory N CoI: Dr. Richard W. Pogge The Ohio State University N CoI: Dr. Eva Schinnerer Max-Planck-Institut fur Astronomie, N Heidelberg ------------------------------------------------------------------------------------ Abstract Significant progress in our understanding of star formation and galaxy evolution depends on ability to obtain precise measurements of the star formation rate on scales from individual regions to large samples of galaxies. In order to do so we need to benchmark star formation rate estimators available for large samples and over wide areas (e.g., Halpha+IR, UV+IR) against high quality, spatially resolved "ground-truth" measurements. This has been done in groundbreaking studies for indivdiual regions, but has yet to be done carefully using maps covering whole area of nearby galaxies. The Paschen beta line is ideal for this purpose: it tracks star formation by tracing ionizing photons the can be cleanly associated with young stars and it is 3x less affected by extinction than the commonly used Halpha line. Most important WFC3 has the demonstrate ability to map Paschen beta at high resolution and excellent sensitivity over the whole area of nearby galaxies. We propose to use this capability to map the active area of active star formation in NGC6946, making only the second deeply sensitive map of Paschen beta across a whole nearby star-forming galaxy. We will use this to (1) inter-compare proposed ground-truth tracers (free-free, optical Balmer decrement, Paschen beta + Halpha) and (2) to improve the calibration of empirical star formation rate estimators by measuring them for individual regions, across large parts of galaxies, and comparing galaxies. Only HST can provide this new and important measurement of an extinction robust tracer of ionizing photon rates at high sensitivity and resolution across a whole galaxy. ------------------------------------------------------------------------------------ Observations Description ------------------------ We aim for a 3 x 3 mosaic in the 128N (Paschen Beta) and 110W (broad band off) filters. The orientation is allowed to be anything as long as it is fixed - that is, we are happy with a circle being our guaranteed coverage and then the square can be pointed any direction around this. ------------------------------------------------------------------------------------ 14156( 3) - 05-Nov-2015 17:04:16 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6946-CEN GALAXY, DISK, SPIRAL RA=20H34M52.3200S, J2000 V = 8.57 TER DEC=+60D09'14.04" Reference Frame: Other: NED Extended: YES Comments: This object was generated by the targetselector and retrieved from the NED database. This is the central position in the galaxy. The flux is the total V (Johnson) magnitude from NED. ------------------------------------------------------------------------------------------------------------------------------------ 14156( 3) - 05-Nov-2015 17:04:16 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 5.183 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.859 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB WFC3-IR-DITHER-LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 5.183 0.636 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 41.788 Angle_Between_Sides Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ 14156( 3) - 05-Nov-2015 17:04:16 - [ 4] Visit: 02 Visit Requirements: 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 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F128N NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG NTER CUM (1411.742 -125.13276000000002, S) -110.74257000000001; PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F110W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF POS TARG NTER CUM (455.874 -125.13276000000002, S) -110.74257000000001; PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F128N NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, NTER CUM (1411.742 -110.74257000000001; S) PATTERN 2 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F110W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF POS TARG 0, NTER CUM (455.874 -110.74257000000001; S) PATTERN 1 4 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F128N NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG NTER CUM (1411.742 125.13276000000002, S) -110.74257000000001; PATTERN 2 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F110W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF POS TARG NTER CUM (455.874 125.13276000000002, S) -110.74257000000001; PATTERN 1 6 ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F128N NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG NTER CUM (1411.742 125.13276000000002, 0; S) PATTERN 2 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F110W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF POS TARG NTER CUM (455.874 125.13276000000002, 0; S) PATTERN 1 8 ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F128N NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, 0; PATTERN 2 NTER CUM (1411.742 9 S) ------------------------------------------------------------------------------------------------------------------------------------ 14156( 3) - 05-Nov-2015 17:04:16 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F110W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF POS TARG 0, 0; PATTERN 1 NTER CUM (455.874 10 S) ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F128N NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG NTER CUM (1411.742 -125.13276000000002, 0; S) PATTERN 2 11 ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F110W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF POS TARG NTER CUM (455.874 -125.13276000000002, 0; S) PATTERN 1 12 ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F128N NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG NTER CUM (1411.742 -125.13276000000002, S) 110.74256999999999; PATTERN 2 13 ------------------------------------------------------------------------------------------------------------------------------------ 14 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F110W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF POS TARG NTER CUM (455.874 -125.13276000000002, S) 110.74256999999999; PATTERN 1 14 ------------------------------------------------------------------------------------------------------------------------------------ 15 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F128N NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, NTER CUM (1411.742 110.74256999999999; S) PATTERN 2 15 ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F110W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF POS TARG 0, NTER CUM (455.874 110.74256999999999; S) PATTERN 1 16 ------------------------------------------------------------------------------------------------------------------------------------ 17 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F128N NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG NTER CUM (1411.742 125.13276000000002, S) 110.74256999999999; PATTERN 2 17 ------------------------------------------------------------------------------------------------------------------------------------ 18 NGC-6946-CE WFC3/IR MULTIAC IR-FIX F110W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF POS TARG NTER CUM (455.874 125.13276000000002, S) 110.74256999999999; PATTERN 1 18 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 14156( 3) - 05-Nov-2015 17:04:16 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6946-CENTER 1 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 1 N/A CUM NGC-6946-CENTER 1 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 1 N/A CUM NGC-6946-CENTER 1 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 1 N/A CUM NGC-6946-CENTER 1 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 1 N/A CUM NGC-6946-CENTER 2 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 1 N/A CUM NGC-6946-CENTER 2 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 1 N/A CUM NGC-6946-CENTER 3 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 1 N/A CUM NGC-6946-CENTER 3 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 1 N/A CUM NGC-6946-CENTER 3 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 2 N/A CUM NGC-6946-CENTER 3 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 2 N/A CUM NGC-6946-CENTER 4 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 2 N/A CUM NGC-6946-CENTER 4 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 2 N/A CUM NGC-6946-CENTER 5 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 2 N/A CUM NGC-6946-CENTER 5 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 2 N/A CUM NGC-6946-CENTER 5 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 3 N/A CUM NGC-6946-CENTER 5 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 3 N/A CUM NGC-6946-CENTER 6 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 3 N/A CUM NGC-6946-CENTER 6 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 3 N/A CUM NGC-6946-CENTER 7 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 3 N/A CUM NGC-6946-CENTER 7 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 3 N/A CUM NGC-6946-CENTER 7 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 3 N/A CUM NGC-6946-CENTER 7 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 4 N/A CUM NGC-6946-CENTER 8 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 4 N/A CUM NGC-6946-CENTER 8 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 4 N/A CUM 14156( 3) - 05-Nov-2015 17:04:16 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6946-CENTER 9 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 4 N/A CUM NGC-6946-CENTER 9 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 4 N/A CUM NGC-6946-CENTER 9 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 4 N/A CUM NGC-6946-CENTER 9 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 4 N/A CUM NGC-6946-CENTER 10 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 5 N/A CUM NGC-6946-CENTER 10 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 5 N/A CUM NGC-6946-CENTER 11 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 5 N/A CUM NGC-6946-CENTER 11 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 5 N/A CUM NGC-6946-CENTER 11 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 5 N/A CUM NGC-6946-CENTER 11 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 5 N/A CUM NGC-6946-CENTER 12 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 5 N/A CUM NGC-6946-CENTER 12 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 6 N/A CUM NGC-6946-CENTER 13 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 6 N/A CUM NGC-6946-CENTER 13 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 6 N/A CUM NGC-6946-CENTER 13 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 6 N/A CUM NGC-6946-CENTER 13 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 6 N/A CUM NGC-6946-CENTER 14 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 6 N/A CUM NGC-6946-CENTER 14 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 6 N/A CUM NGC-6946-CENTER 15 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 7 N/A CUM NGC-6946-CENTER 15 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 7 N/A CUM NGC-6946-CENTER 15 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 7 N/A CUM NGC-6946-CENTER 15 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 7 N/A CUM NGC-6946-CENTER 16 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 7 N/A CUM NGC-6946-CENTER 16 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 7 N/A CUM 14156( 3) - 05-Nov-2015 17:04:16 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6946-CENTER 17 WFC3/IR MULTIAC IR-FIX F128N 1 1 none none 7 N/A CUM NGC-6946-CENTER 17 WFC3/IR MULTIAC IR-FIX F128N 1 2 none none 7 N/A CUM NGC-6946-CENTER 17 WFC3/IR MULTIAC IR-FIX F128N 2 1 none none 8 N/A CUM NGC-6946-CENTER 17 WFC3/IR MULTIAC IR-FIX F128N 2 2 none none 8 N/A CUM NGC-6946-CENTER 18 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 8 N/A CUM NGC-6946-CENTER 18 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 8 N/A CUM 14156( 3) - 05-Nov-2015 17:04:16 - [ 9] Summary Form for Proposal 14156 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=10, NSAMP=8, SAMP-SEQ=SPARS25, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 10, PATTERN 1 12, PATTERN 1 14, PATTERN 1 16, PATTERN 1 18, PATTERN 1 2, PATTERN 1 4, PATTERN 1 6, PATTERN 1 8, PATTERN 2 1, PATTERN 2 11, PATTERN 2 13, PATTERN 2 15, PATTERN 2 17, PATTERN 2 3, PATTERN 2 5, PATTERN 2 7, PATTERN 2 9, POS TARG -125.13276000000002, -110.74257000000001, POS TARG -125.13276000000002, 0, POS TARG -125.13276000000002, 110.74256999999999, POS TARG 0, -110.74257000000001, POS TARG 0, 0, POS TARG 0, 110.74256999999999, POS TARG 125.13276000000002, -110.74257000000001, POS TARG 125.13276000000002, 0, POS TARG 125.13276000000002, 110.74256999999999 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F128N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-6946-CENTER ------------------------------------------------------------------------------------------------------------------------------------