14187( 4) - 21-Oct-2015 15:07:20 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14187 Version: 4 Check-in Time: 21-Oct-2015 15:07:20 STScI Edit Number: 1 Title Studying the nuclear morphology of a dwarf galaxy with a 50,000 solar mass black hole ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Vivienne Baldassare University of Michigan Y CoI: Dr. Amy E. Reines University of Michigan N CoI: Dr. Elena Gallo University of Michigan N CoI: Prof. Jenny E. Greene Princeton University N ------------------------------------------------------------------------------------ Abstract Active galactic nuclei in dwarf galaxies represent a new class of objects in which to study the physics of black hole growth and black hole-galaxy coevolution. We recently discovered an active 50, 000 solar mass black hole in the nucleus of RGG 118, a dwarf disk galaxy ~100 Mpc away. Here, we describe WFC3/IR and UVIS observations that we will use to study the detailed nuclear morphology of the host galaxy. Such systems are still relatively rare compared to the population of active galactic nuclei as a whole, and sensitive, high resolution observations are necessary to determine whether these systems have special structural properties (i.e. bulges, nuclear bars) compared to the general dwarf galaxy population. Additionally, these observations will allow us to measure bulge mass and luminosity to test whether RGG 118 follows well-known black hole-galaxy scaling relations. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use WFC3 UVIS and IR observations to analyze its structure, measure colors, and characterize star formation in RGG 118. At the distance of RGG 118 (~100 Mpc), 1 arcsecond corresponds to roughly 500 parsecs. We will use a combination of WFC3/IR F160W and the WFC3/UVIS F475W and F775W filters (H, g, and i band, respectively) to study the structure of RGG 118 and measure colors. We will use one orbit for each filter for a total of 3 orbits. The use of (g-i) and (i-H) colors to derive an H-band mass-to-light ratio has been shown to be the most robust and accurate combination for determining masses (Zibetti et al. 2009). The use of H-band mitigates the effect of dust extinction, and the large span in wavelength makes this mass estimator sensitive to the presence of young stellar populations. UVIS/F475W: We will achieve a 10-sigma surface brightness of at least mu_r = 23 mag/arcsec^2 in a 5x5 box (approximately 2x2 WFC3/IR pixels). Our total exposure time for this filter will be ~2500 seconds. This will be broken into four exposures, and we'll use a 4-point box dither pattern to improve PSF sampling and remove bad pixels. We will place the galaxy on Chip 2, since it is 14187( 4) - 21-Oct-2015 15:07:20 - [ 2] more sensitive. UVIS/F775W: We will achieve a 10-sigma surface brightness of at least mu_r = 23 mag/arcsec^2 in a 5x5 box (approximately 2x2 WFC3/IR pixels). Our total exposure time for this filter will be ~2600 seconds. We'll use a 4-point box dither pattern to improve PSF sampling and remove bad pixels, and use Chip 2. IR/F160W: The high throughput of WFC3/IR makes it ideal for studying the detailed structure of the nucleus of RGG 118. With our observations, we will achieve a 10-sigma surface brightness sensitivity of at least mu_r = 23.5 mag/arcsec^2 in a given pixel; with radial averaging, we should be able to probe at least an order of magnitude deeper. This ensures that we will be able to sensitively probe the morphology of the galaxy out to 10 arcsec, i.e. where the bulge is dominant. We will first use a 4-point dither pattern combined with the STEP200 timing sequence and NSAMP=10 to give four exposures of ~600 seconds each. We will also take an additional ~300 second exposure (with NSAMP=9 and the STEP100 timing sequence). ------------------------------------------------------------------------------------ 14187( 4) - 21-Oct-2015 15:07:20 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS-J152304 GALAXY, BULGE, NUCLEUS, RA=15H23M4.9728S, J2000 Z = V = 16.76 .97+114553.6 SPIRAL DEC=+11D45'53.60" 0.0243 Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 14187( 4) - 21-Oct-2015 15:07:20 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 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 YES ------------------------------------------------------------------------------------------------------------------------------------ 14187( 4) - 21-Oct-2015 15:07:20 - [ 5] Visit: 01 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 SDSS-J15230 WFC3/UVI ACCUM UVIS2 F475W 1 578 S PATTERN 1 1 4.97+114553 S (2312 S) .6 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS-J15230 WFC3/UVI ACCUM UVIS2 F475W FLASH=11 1 50 S (50 4.97+114553 S S) .6 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS-J15230 WFC3/UVI ACCUM UVIS2 F775W 1 606 S PATTERN 1 3 4.97+114553 S (2424 S) .6 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS-J15230 WFC3/UVI ACCUM UVIS2 F775W FLASH=11 1 50 S (50 4.97+114553 S S) .6 ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS-J15230 WFC3/IR MULTIAC IR F160W NSAMP=10, SAMP-SEQ=STEP200 1 DEF PATTERN 2 5 4.97+114553 CUM (2396.925 .6 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SDSS-J15230 WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=STEP100 1 DEF 4.97+114553 CUM (299.231 .6 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSS-J152304.97+114 1 WFC3/UVI ACCUM UVIS2 F475W 1 none none none 1 N/A 553.6 S SDSS-J152304.97+114 1 WFC3/UVI ACCUM UVIS2 F475W 2 none none none 1 N/A 553.6 S SDSS-J152304.97+114 1 WFC3/UVI ACCUM UVIS2 F475W 3 none none none 1 N/A 553.6 S SDSS-J152304.97+114 1 WFC3/UVI ACCUM UVIS2 F475W 4 none none none 1 N/A 553.6 S SDSS-J152304.97+114 2 WFC3/UVI ACCUM UVIS2 F475W none none none none 1 N/A 553.6 S SDSS-J152304.97+114 3 WFC3/UVI ACCUM UVIS2 F775W 1 none none none 2 N/A 553.6 S 14187( 4) - 21-Oct-2015 15:07:20 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSS-J152304.97+114 3 WFC3/UVI ACCUM UVIS2 F775W 2 none none none 2 N/A 553.6 S SDSS-J152304.97+114 3 WFC3/UVI ACCUM UVIS2 F775W 3 none none none 2 N/A 553.6 S SDSS-J152304.97+114 3 WFC3/UVI ACCUM UVIS2 F775W 4 none none none 2 N/A 553.6 S SDSS-J152304.97+114 4 WFC3/UVI ACCUM UVIS2 F775W none none none none 2 N/A 553.6 S SDSS-J152304.97+114 5 WFC3/IR MULTIAC IR F160W 1 none none none 3 N/A 553.6 CUM SDSS-J152304.97+114 5 WFC3/IR MULTIAC IR F160W 2 none none none 3 N/A 553.6 CUM SDSS-J152304.97+114 5 WFC3/IR MULTIAC IR F160W 3 none none none 3 N/A 553.6 CUM SDSS-J152304.97+114 5 WFC3/IR MULTIAC IR F160W 4 none none none 3 N/A 553.6 CUM SDSS-J152304.97+114 6 WFC3/IR MULTIAC IR F160W none none none none 3 N/A 553.6 CUM 14187( 4) - 21-Oct-2015 15:07:20 - [ 7] Summary Form for Proposal 14187 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=11, NSAMP=10, NSAMP=9, SAMP-SEQ=STEP100, SAMP-SEQ=STEP200 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 3, PATTERN 2 5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F475W, F775W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SDSS-J152304.97+114553.6 ------------------------------------------------------------------------------------------------------------------------------------