0 Assigned ID: 934 ----- Attempting Submission 1 (Fri Apr 10 22:19:33 GMT 2015) ----- HST Phase I Proposal 934 (APT_RGG118.apt) successfully submitted. Receipt: # 934-1 FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser Resubmitting to include 50s exposures in the UVIS filters in case of saturation. 1739197130 ----- Attempting Submission 1 (Thu Jul 23 17:40:19 GMT 2015) ----- ----- Attempting Submission 2 (Wed Oct 21 14:59:09 GMT 2015) ----- The expected number of electrons/pixel is 10.8, which is very slightly less than the suggested number of 12. 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. 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 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). AGN/QUASARS 12 false false false false SUPPORTED GALAXY BULGE NUCLEUS SPIRAL This object was generated by the targetselector and retrieved from the NED database. J2000 J2000 WFC3/IR Imaging No No F160W WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F775W POS-TARG DITHER 0.173 LINE 0.112 false true 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false POS-TARG DITHER 0.572 LINE 0.365 false true 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 2 false /Users/vbaldas/Documents/Proposals/HST_cycle23/RGG118/OP-cache/apt_rgg118_phaseII_v4-v01.xml 1445359401302 The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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