15123( 3) - 24-Oct-2017 10:23:40 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15123 Version: 3 Check-in Time: 24-Oct-2017 10:23:40 STScI Edit Number: 0 Title Probing the accretion flow and emission-line regions of M81, the nearest broad-lined low-luminosity AGN ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Aaron J. Barth University of California - Irvine Y CoI: Dr. Luis C. Ho Peking University N CoI: Prof. Feng Yuan Chinese Academy of Sciences N CoI: Dr. Sera Markoff Universiteit van Amsterdam N CoI: Dr. Yuichi Terashima Ehime University N ------------------------------------------------------------------------------------ Abstract The nucleus of M81 is an object of singular importance as a template for low-luminosity accretion flows onto supermassive black holes. We propose to obtain a complete, small-aperture, high S/N STIS UV/optical spectrum of the M81 nucleus and multi-filter WFC3 imaging covering the UV through near-IR. Such data have never previously been obtained with HST; the only prior archival UV/optical spectra of M81 have low S/N, incomplete wavelength coverage, and are strongly contaminated by starlight. Combined with new Chandra X-ray data, our proposed observations will comprise the definitive reference dataset on the spectral energy distribution of this benchmark low-luminosity AGN. These data will provide unique new constraints on the possible contribution of a truncated thin accretion disk to the AGN emission spectrum, clarifying a fundamental property of low-luminosity accretion flows. The data will additionally provide new insights into broad-line region structure and black hole mass scaling relationships at the lowest AGN luminosities, and spatially resolved diagnostics of narrow-line region excitation conditions at unprecedented spatial resolution to assess the impact of the AGN on the ionization state of the gas in the host galaxy bulge. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program is designed to obtain complete UV and optical spectroscopy plus multi-band near-UV through near-IR imaging of the nucleus of M81. We will obtain STIS spectroscopy in the 0.2 arcsec slit in the G140L, G230L, G430L, and G750L grating settings, plus the G750M grating with central wavelength 6581 A to obtain a medium-resolution spectrum of the H-alpha + [NII] blend. This program also includes a coordinated Chandra HETG observation of M81 in order to obtain the spectral energy distribution from X-rays through UVOIR wavelengths. In order to minimize the impact of AGN variability on the spectral energy distribution measurement, we have grouped the HST visits to be observed within a 14 day window. If it is possible for all visits to be scheduled within an even shorter time window, that would be very beneficial for the science, so we request that the observations be scheduled within the shortest time span that is feasible to obtain. The HST visits can be carried out in any sequence, within the specified time window. We have also used the SAME-ORIENT-AS keyword 15123( 3) - 24-Oct-2017 10:23:40 - [ 2] to require that all of the STIS visits should be carried out at the same spacecraft orientation, in order to sample the same portion of the AGN narrow-line region within the STIS slit. We will also request that the Chandra observation be obtained during the same 14 day window if possible. Each STIS visit will begin with a standard STIS target acquisition. The AGN nucleus is compact and bright, and we select ACQTYPE=POINT because this has been used successfully for past STIS acquisitions of the M81 nucleus in programs 7350 and 7351. For the UV spectroscopy, we have 4 orbits for G140L and 1 orbit for G230L. These are broken up into two separate visits: one visit with 3 orbits of G140L, and one visit with 1 orbit of G140L and one orbit of G230L. The MAMA observations will be dithered using the STIS-ALONG-SLIT pattern following the recommendation of Section 12.5.1 of the STIS instrument handbook. For the MAMA observations, ACCUM mode will be used instead of TIME-TAG because the higher overheads required for memory buffer dumps for dithered TIME-TAG observations would lead to a reduction in the on-source integration time. The STIS CCD observations will be carried out in a separate visit, with one orbit for G750M observations and one orbit for G430L and G750L. In each case, we will obtain 5 exposures dithered with STIS-ALONG-SLIT in order to optimize the cosmic-ray cleaning to produce a high S/N spectrum. For G750L we will obtain CCDFLAT exposures at the end of the orbit. CCDFLATs will be done using the 52X0.1 slit as recommended for point sources in Table 11.1 of the STIS Instrument Handbook. For the G750L observation of M81, we choose not to use the E2 aperture position since this would negatively impact the overall throughput and would negatively impact the spectral and spatial matching with the G430L grating observation. With WFC3, we will obtain observations in F218W, F438W, F547M, and F814W (UVIS), and F153M (IR). Short exposure times will be used in order to avoid saturation of the bright nuclear point source in the optical filters. In order to fit all WFC3 observations into one orbit and avoid buffer dump overheads, we will use subarray readouts for the UVIS and IR detectors. Subarray readouts are acceptable in this case because our primary goal is to measure the AGN point source flux, and the HST archive already contains extensive full-frame observations of M81 in multiple filters. There are no orientation constraints for the WFC3 visit, but it should be done as close in time to the STIS observations as is feasible, within the specified 14-day window. ------------------------------------------------------------------------------------ 15123( 3) - 24-Oct-2017 10:23:40 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M-81 GALAXY, ACCRETION DISK, RA=09H55M33.1731S +/- 0.1", J2000 V = 6.94 BLR, LINER, NLR, DEC=+69D03'55.06" +/- 0.1" NUCLEUS Reference Frame: ICRS Comments: Coordinates are from ICRF2 catalog (Fey et al 2015, AJ, 150, 58) and were checked against SDSS and 2MASS images for consistency. ------------------------------------------------------------------------------------------------------------------------------------ 15123( 3) - 24-Oct-2017 10:23:40 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 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 NO ------------------------------------------------------------------------------------------------------------------------------------ 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: 5 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.4 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 6 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 5 Point_Spacing 0.1 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15123( 3) - 24-Oct-2017 10:23:40 - [ 5] Visit: 01 Visit Requirements: GROUP 01, 02, 03, 04 WITHIN 14D On Hold Comments: Additional Comments: All 4 visits should be done within a total span of 14 days, and a shorter total span is strongly preferred in order to minimize the impact of source variability. Please schedule all visits as close in time to one another as is feasible. Visits 1, 2, and 3 should be done at the same spacecraft orientation to obtain the same STIS slit positioning on the target. 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 M-81 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 10 S (10 S) Comments: ACQ exposure time of 10 s was used previously in GO-7350, producing ~17000 counts within a 3x3 checkbox at the galaxy nucleus. ------------------------------------------------------------------------------------------------------------------------------------ 2 M-81 STIS/FUV ACCUM 52X0.2 G140L 1425 1 838 S PATTERN 5 2 -MAMA (2514 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M-81 STIS/FUV ACCUM 52X0.2 G140L 1425 1 1066 S PATTERN 5 3 -MAMA (3198 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 M-81 STIS/FUV ACCUM 52X0.2 G140L 1425 1 1066 S PATTERN 5 4 -MAMA (3198 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-81 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A M-81 2 STIS/FUV ACCUM 52X0.2 G140L 1425 1 none none none 1 N/A -MAMA M-81 2 STIS/FUV ACCUM 52X0.2 G140L 1425 2 none none none 1 N/A -MAMA M-81 2 STIS/FUV ACCUM 52X0.2 G140L 1425 3 none none none 1 N/A -MAMA M-81 3 STIS/FUV ACCUM 52X0.2 G140L 1425 1 none none none 2 N/A -MAMA M-81 3 STIS/FUV ACCUM 52X0.2 G140L 1425 2 none none none 2 N/A -MAMA M-81 3 STIS/FUV ACCUM 52X0.2 G140L 1425 3 none none none 2 N/A -MAMA M-81 4 STIS/FUV ACCUM 52X0.2 G140L 1425 1 none none none 3 N/A -MAMA M-81 4 STIS/FUV ACCUM 52X0.2 G140L 1425 2 none none none 3 N/A -MAMA 15123( 3) - 24-Oct-2017 10:23:40 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-81 4 STIS/FUV ACCUM 52X0.2 G140L 1425 3 none none none 3 N/A -MAMA 15123( 3) - 24-Oct-2017 10:23:40 - [ 7] Visit: 02 Visit Requirements: SAME ORIENT AS 01 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 M-81 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 10 S (10 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M-81 STIS/FUV ACCUM 52X0.2 G140L 1425 1 838 S PATTERN 5 2 -MAMA (2514 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M-81 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1035 S PATTERN 5 3 -MAMA (3105 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-81 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A M-81 2 STIS/FUV ACCUM 52X0.2 G140L 1425 1 none none none 1 N/A -MAMA M-81 2 STIS/FUV ACCUM 52X0.2 G140L 1425 2 none none none 1 N/A -MAMA M-81 2 STIS/FUV ACCUM 52X0.2 G140L 1425 3 none none none 1 N/A -MAMA M-81 3 STIS/NUV ACCUM 52X0.2 G230L 2376 1 none none none 2 N/A -MAMA M-81 3 STIS/NUV ACCUM 52X0.2 G230L 2376 2 none none none 2 N/A -MAMA M-81 3 STIS/NUV ACCUM 52X0.2 G230L 2376 3 none none none 2 N/A -MAMA 15123( 3) - 24-Oct-2017 10:23:40 - [ 8] Visit: 03 Visit Requirements: SAME ORIENT AS 01 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 M-81 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 10 S (10 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M-81 STIS/CCD ACCUM 52X0.2E1 G750M 6581 CR-SPLIT=NO 1 475 S PATTERN 6 2 (2375 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M-81 STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=NO 1 368 S PATTERN 6 3 (1840 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 M-81 STIS/CCD ACCUM 52X0.2E1 G750L 7751 CR-SPLIT=NO 1 125 S (625 PATTERN 6 4 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CCDFLAT STIS/CCD ACCUM 52X0.1 G750L 7751 2 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-81 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A M-81 2 STIS/CCD ACCUM 52X0.2E1 G750M 6581 1 none none none 1 N/A M-81 2 STIS/CCD ACCUM 52X0.2E1 G750M 6581 2 none none none 1 N/A M-81 2 STIS/CCD ACCUM 52X0.2E1 G750M 6581 3 none none none 1 N/A M-81 2 STIS/CCD ACCUM 52X0.2E1 G750M 6581 4 none none none 1 N/A M-81 2 STIS/CCD ACCUM 52X0.2E1 G750M 6581 5 none none none 1 N/A M-81 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 1 none none none 2 N/A M-81 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 2 none none none 2 N/A M-81 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 3 none none none 2 N/A M-81 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 4 none none none 2 N/A M-81 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 5 none none none 2 N/A M-81 4 STIS/CCD ACCUM 52X0.2E1 G750L 7751 1 none none none 2 N/A M-81 4 STIS/CCD ACCUM 52X0.2E1 G750L 7751 2 none none none 2 N/A M-81 4 STIS/CCD ACCUM 52X0.2E1 G750L 7751 3 none none none 2 N/A M-81 4 STIS/CCD ACCUM 52X0.2E1 G750L 7751 4 none none none 2 N/A M-81 4 STIS/CCD ACCUM 52X0.2E1 G750L 7751 5 none none none 2 N/A CCDFLAT 5 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 1 none 2 N/A CCDFLAT 5 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 2 none 2 N/A 15123( 3) - 24-Oct-2017 10:23:40 - [ 9] Visit: 04 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 M-81 WFC3/UVI ACCUM UVIS2-C51 F547M CR-SPLIT=NO, FLASH=11 1 10 S (40 PATTERN 2 1 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M-81 WFC3/UVI ACCUM UVIS2-C51 F814W CR-SPLIT=NO, FLASH=11 1 5 S (20 S) PATTERN 2 2 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 3 M-81 WFC3/UVI ACCUM UVIS2-C51 F438W CR-SPLIT=NO, FLASH=11 1 20 S (80 PATTERN 2 3 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 M-81 WFC3/UVI ACCUM UVIS2-C51 F218W CR-SPLIT=NO, FLASH=11 1 410 S PATTERN 2 4 S 2C-SUB (1640 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M-81 WFC3/IR MULTIAC IRSUB512 F153M NSAMP=14, SAMP-SEQ=SPARS5 1 DEF PATTERN 3 5 CUM (155.33 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-81 1 WFC3/UVI ACCUM UVIS2-C5 F547M 1 none none none 1 N/A S 12C-SUB M-81 1 WFC3/UVI ACCUM UVIS2-C5 F547M 2 none none none 1 N/A S 12C-SUB M-81 1 WFC3/UVI ACCUM UVIS2-C5 F547M 3 none none none 1 N/A S 12C-SUB M-81 1 WFC3/UVI ACCUM UVIS2-C5 F547M 4 none none none 1 N/A S 12C-SUB M-81 2 WFC3/UVI ACCUM UVIS2-C5 F814W 1 none none none 1 N/A S 12C-SUB M-81 2 WFC3/UVI ACCUM UVIS2-C5 F814W 2 none none none 1 N/A S 12C-SUB M-81 2 WFC3/UVI ACCUM UVIS2-C5 F814W 3 none none none 1 N/A S 12C-SUB M-81 2 WFC3/UVI ACCUM UVIS2-C5 F814W 4 none none none 1 N/A S 12C-SUB M-81 3 WFC3/UVI ACCUM UVIS2-C5 F438W 1 none none none 1 N/A S 12C-SUB M-81 3 WFC3/UVI ACCUM UVIS2-C5 F438W 2 none none none 1 N/A S 12C-SUB 15123( 3) - 24-Oct-2017 10:23:40 - [ 10] 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-81 3 WFC3/UVI ACCUM UVIS2-C5 F438W 3 none none none 1 N/A S 12C-SUB M-81 3 WFC3/UVI ACCUM UVIS2-C5 F438W 4 none none none 1 N/A S 12C-SUB M-81 4 WFC3/UVI ACCUM UVIS2-C5 F218W 1 none none none 1 N/A S 12C-SUB M-81 4 WFC3/UVI ACCUM UVIS2-C5 F218W 2 none none none 1 N/A S 12C-SUB M-81 4 WFC3/UVI ACCUM UVIS2-C5 F218W 3 none none none 1 N/A S 12C-SUB M-81 4 WFC3/UVI ACCUM UVIS2-C5 F218W 4 none none none 1 N/A S 12C-SUB M-81 5 WFC3/IR MULTIAC IRSUB512 F153M 1 none none none 1 N/A CUM M-81 5 WFC3/IR MULTIAC IRSUB512 F153M 2 none none none 1 N/A CUM M-81 5 WFC3/IR MULTIAC IRSUB512 F153M 3 none none none 1 N/A CUM M-81 5 WFC3/IR MULTIAC IRSUB512 F153M 4 none none none 1 N/A CUM 15123( 3) - 24-Oct-2017 10:23:40 - [ 11] Summary Form for Proposal 15123 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.1, 52X0.2, 52X0.2E1, F28X50LP, IRSUB512, UVIS2-C512C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA, WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT, CR-SPLIT=NO, FLASH=11, NSAMP=14, SAMP-SEQ=SPARS5 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 01, 02, 03, 04 WITHIN 14D, PATTERN 2 1, PATTERN 2 2, PATTERN 2 3, PATTERN 2 4, PATTERN 3 5, PATTERN 5 2, PATTERN 5 3, PATTERN 5 4, PATTERN 6 2, PATTERN 6 3, PATTERN 6 4, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F153M, F218W, F438W, F547M, F814W, G140L, G230L, G430L, G750L, G750M, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names CCDFLAT, M-81 ------------------------------------------------------------------------------------------------------------------------------------