0 Assigned ID: 2531 ----- Attempting Submission 1 (Sun Sep 14 00:45:18 GMT 2014) ----- 0 ----- Attempting Submission 1 (Fri Oct 24 18:22:49 GMT 2014) ----- Probing the Growth of Massive Black Holes in Dwarf Galaxies with Chandra and HST The study of massive black holes (BHs) in dwarf galaxies can place valuable constraints on the birth and growth of the first supermassive BH seeds. We propose Chandra and HST observations of 8 dwarf galaxies from our recent sample of optically-selected AGN in galaxies with stellar masses comparable to the Magellanic Clouds (Reines et al. 2013). Our target galaxies host broad-line AGN and contain the least-massive BHs known in galaxy nuclei. The proposed observations will enable us to characterize the compact X-ray and UV emission from the AGN, estimate Eddington ratios for the smallest BHs known, and investigate host galaxy properties and BH scaling relations at the sparsely populated low-mass end. UVIS F275W: Our UV observations are designed to detect a moderately accreting low-mass AGN. Assuming a BH mass of ~10^5 Msun, an Eddington ratio of a few percent, and a UV-bolometric correction of 10 gives an expected UV luminosity of ~3e40 erg/s. At a mean distance of of our sample (~150 Mpc), this corresponds to a flux density of ~4e-18 erg/s/cm^2/Ang at 2700 Ang. To detect such a point source with a S/N ~10, the WFC3/UVIS exposure time calculator suggests we need ~750 s in F275W with post-flash=12 to avoid poor charge transfer efficiency. We will break the total time into 3 dithered exposures to facilitate cosmic-ray rejection, avoid bad pixels, and improve the PSF sampling. Since our target galaxies are quite compact, we will use a 1kx1k subarray to avoid buffer dumps and reduce readout overhead. Chip 2 will be used since it is more sensitive than chip 1. UVIS F606W: We will use the F606W optical filter to bridge the gap between our UV and near-IR observations and obtain important color diagnostics. To ensure we can accurately separate bulge and disk components, we aim to reach a 10-sigma surface-brightness sensitivity of mu_r ~ 23 mag/arcsec^2 in a 7 x 7 pixel box (roughly equivalent to 2 x 2 IR pixels). The WFC/UVIS exposure time calculator suggests we need ~ 600 s in F606W. We will break the total time into 3 dithered exposures and use the 2kx 2k subarray with chip 2. IR/F110W: Based on surface brightness profiles of our faintest targets, we wish to reach a 10-sigma surface-brightness sensitivity of mu_r ~ 23 mag/arcsec^2 in a given pixel. Prior experience suggests that we will be able to reach at least a magnitude deeper with radial averaging than our per-pixel depth. This will allow us to detect the outer parts of the disks in our target galaxies, which is necessary to adequately decouple bulge and disk components on small scales. According to the WFC3/IR exposure time calculator, we need ~ 400 s to reach our required sensitivity in F110W. We will break the total time into 4 dithered exposures to improve the PSF sampling and avoid bad pixels. We will use the timing sequence STEP25 with NSAMP=9 (~100 s per exposure) to increase our dynamic range, avoid potential saturation from AGN and allow the use of the IRSUB512 subarray to avoid buffer dumps. Our galaxies are quite compact so using a subarray will not compromise our science or limit our sky subtraction. AGN/QUASARS Default false false false false false SUPPORTED GALAXY SEYFERT J2000 J2000 SDSS u=20.4, g=18.9, z=17.4 GALAXY SEYFERT J2000 J2000 SDSS u=19.1, g=17.8, z=16.9 GALAXY SEYFERT J2000 J2000 SDSS u=18.3, g=17.2, z=16.3 GALAXY SEYFERT J2000 J2000 SDSS u=17.8, g=16.7, z=15.8 GALAXY SEYFERT J2000 J2000 SDSS u=18.2, g=17.3, z=16.6 GALAXY SEYFERT J2000 J2000 SDSS u=18.8, g=17.9, z=17.0 GALAXY SEYFERT J2000 J2000 SDSS u=20.0, g=18.6, z=17.2 GALAXY SEYFERT J2000 J2000 SDSS u=18.4, g=17.6, z=18.6 WFC3/IR Imaging No No F110W WFC3/UVIS Imaging No No F275W WFC3/IR Imaging No No F110W WFC3/UVIS Imaging No No F275W WFC3/IR Imaging No No F110W WFC3/UVIS Imaging No No F275W WFC3/IR Imaging No No F110W WFC3/UVIS Imaging No No F275W WFC3/IR Imaging No No F110W WFC3/UVIS Imaging No No F275W WFC3/IR Imaging No No F110W WFC3/UVIS Imaging No No F275W WFC3/IR Imaging No No F110W WFC3/UVIS Imaging No No F275W WFC3/IR Imaging No No F110W WFC3/UVIS Imaging No No F275W POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 1 false POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 2 false /Users/areines/Desktop/HST22_phaseII/OP-cache/hst22_apt-v01.xml The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13943 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "24-Oct-2014 11:30:18.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 446400 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13943 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13943 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2889 :al-overhead-at-end 0 :internal-dur-at-end 569 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0 /Users/areines/Desktop/HST22_phaseII/OP-cache/hst22_apt-v02.xml The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. 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(Tic-Visit :proposal-id 13943 :visit-id "03" :proposal-version -1 :trans-version "20140605" :date "24-Oct-2014 11:46:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 446400 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13943 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13943 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3024 :al-overhead-at-end 0 :internal-dur-at-end 569 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3358 :pcs-gap 0 ) true 1 0 /Users/areines/Desktop/HST22_phaseII/OP-cache/hst22_apt-v04.xml The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. 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(Tic-Visit :proposal-id 13943 :visit-id "07" :proposal-version -1 :trans-version "20140605" :date "24-Oct-2014 11:55:17.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 446400 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13943 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13943 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2898 :al-overhead-at-end 0 :internal-dur-at-end 569 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3231 :pcs-gap 0 ) true 1 0 /Users/areines/Desktop/HST22_phaseII/OP-cache/hst22_apt-v08.xml The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. 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