14091( 5) - 12-Oct-2015 12:53:22 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14091 Version: 5 Check-in Time: 12-Oct-2015 12:53:22 STScI Edit Number: 0 Title Bulge structure and kinematics in an extreme spiral galaxy hosting megaparsec-scale radio jets. ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Aaron J. Barth University of California - Irvine Y CoI: Dr. Joydeep Bagchi Inter-University Centre for Astronomy and N Astrophysics CoI: Dr. Luis C. Ho Peking University N CoI: Dr. Minjin Kim Korea Astronomy and Space Science N Institute (KASI) CoI: Dr. Stephen Alexander Walker University of Cambridge N CoI: Prof. Andrew C. Fabian University of Cambridge N ------------------------------------------------------------------------------------ Abstract The radio galaxy 2MASX J23453268-0449256 is an extreme object with unprecedented properties. It is a disk-dominated and unusually massive red spiral with a rotation speed of 430 km/s at r=15 kpc, and its Mpc-scale radio jets are the largest ever found emerging from a spiral host. Ground-based imaging suggests that its central component is a pseudobulge, and its central stellar velocity dispersion is 350 km/s, surprisingly high for a disk-dominated spiral. X-ray observations show indications of radio-mode feedback on the hot gaseous halo on scales of tens of kpc, also extremely unusual for a spiral galaxy environment. This object challenges the conventional wisdom that the hosts of large-scale radio jets are exclusively early-type galaxies. We propose to obtain new WFC3 optical and IR imaging and Gemini GMOS-IFU spectroscopy of J2345. With the new HST imaging, we will carry out definitive bulge/disk decompositions and quantify the bulge structural parameters accurately, essential for understanding the environment of the central black hole powering the radio jets. GMOS IFU data will provide high-quality spatially resolved measurements of the stellar and gas kinematics of the bulge, which will be used to model the mass distribution in this unique system. Together, these observations will enable us to accurately quantify the structure and kinematics of this extreme galaxy and clarify its physical properties and formation history. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our WFC3 observations will be carried out in two UVIS filters, F438W and F814W, and one IR filter, F160W. We will use two orbits for the imaging. The first orbit will be used for F160W and F814W imaging, and the second orbit will be used for F438W. In each filter, we will use a 3-point line dither pattern. For the IR observation, we will use SAMP-SEQ=STEP25 and NSAMP=12, giving a total of 3*199 sec of exposure time. For the UVIS exposures, according to the WFC3 ETC, a post-flash will not be needed for F814W. For F438W we will use a small post-flash in order to help ensure that we achieve at least the recommended 12 e-/pixel, and FLASH=5 is the minimum amount needed in order to 14091( 5) - 12-Oct-2015 12:53:22 - [ 2] reach the recommended background level. After consultation with STSCI staff the observation sequence was designed to fit within a 51-minute visibility period rather than the full duration of the orbital visibility for this target (53 minutes) in order to allow for scheduling windows that would permit acquisition of two guide stars. In this revised Phase II submission, we have restricted the ORIENT angle range to 305-325 degrees. This angle range will ensure that diffraction spikes from a bright foreground star will not overlap our target, while still allowing for suitable guide stars and visit schedulability. The observations were shortened slightly to fit within a 50-minute visibility window in order to allow for feasible scheduling windows. ------------------------------------------------------------------------------------ 14091( 5) - 12-Oct-2015 12:53:22 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASX-J23453 GALAXY, BULGE, NLR, RA=23H45M32.6880S, J2000 SDSS r = 14.7 mag 268-0449256 NUCLEUS, RADIO GALAXY, DEC=-04D49'25.62" SPIRAL Reference Frame: Other: SIMBAD Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 14091( 5) - 12-Oct-2015 12:53:22 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.605 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 14091( 5) - 12-Oct-2015 12:53:22 - [ 5] Visit: 01 Visit Requirements: ORIENT 305D TO 325 D 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 2MASX-J2345 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP25 1 DEF (597.7 PATTERN 4 1 3268-044925 CUM S) 6 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASX-J2345 WFC3/UVI ACCUM UVIS2 F814W CR-SPLIT=NO 1 510 S PATTERN 3 2 3268-044925 S (1530 S) 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASX-J2345 WFC3/UVI ACCUM UVIS2 F438W CR-SPLIT=NO, FLASH=5 1 830 S PATTERN 3 3 3268-044925 S (2490 S) 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASX-J23453268-044 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A 9256 CUM 2MASX-J23453268-044 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A 9256 CUM 2MASX-J23453268-044 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A 9256 CUM 2MASX-J23453268-044 2 WFC3/UVI ACCUM UVIS2 F814W 1 none none none 1 N/A 9256 S 2MASX-J23453268-044 2 WFC3/UVI ACCUM UVIS2 F814W 2 none none none 1 N/A 9256 S 2MASX-J23453268-044 2 WFC3/UVI ACCUM UVIS2 F814W 3 none none none 1 N/A 9256 S 2MASX-J23453268-044 3 WFC3/UVI ACCUM UVIS2 F438W 1 none none none 2 N/A 9256 S 2MASX-J23453268-044 3 WFC3/UVI ACCUM UVIS2 F438W 2 none none none 2 N/A 9256 S 2MASX-J23453268-044 3 WFC3/UVI ACCUM UVIS2 F438W 3 none none none 2 N/A 9256 S 14091( 5) - 12-Oct-2015 12:53:22 - [ 6] Summary Form for Proposal 14091 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, FLASH=5, NSAMP=12, SAMP-SEQ=STEP25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 305D TO 325 D, PATTERN 3 2, PATTERN 3 3, PATTERN 4 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F438W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASX-J23453268-0449256 ------------------------------------------------------------------------------------------------------------------------------------