8259( 9) - 02/07/01 09:32 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8259 Version: 9 Check-in Date: 07-Feb-2001 09:31:13 1.Proposal Title: The Origin of Blue Wings on NLR Line Profiles ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Mark Whittle The University of Virginia ------------------------------------------------------------------------------------ 5. Abstract Recent progress in understanding the kinematics of the Narrow Line Region (NLR) in Seyfert galaxies has identified three distinct components --- a high velocity nuclear flow, a more widespread gravitational component, and a jet-accelerated component. In this proposal, we aim to isolate and study the high velocity nuclear flow. The observational signature of this component is the famous `blue wing' found on the OIIILambda5007 lines of almost all Seyfert galaxies. Its ubiquity and amplitude suggest high velocity radial flows are present, together with a source of opacity (dust). Surprisingly, although this feature was the first to be identified, its origin and nature are still unknown. The main stumbling block is its compact size and our ignorance of the location of the dust. In this proposal, we select two nearby Seyferts with exceptionally strong blue wings. Using WFPC2 we map the near nuclear distributions of dust and emission lines, while STIS allows us to track in det ail the near nuclear OIII velocity field. Together, these data allow a number of tests of the nature and direction of the near nuclear flow. This is the last zone of the NLR to be understood, and yet it plays a crucial role in carrying that understanding inwards towards the BLR. ------------------------------------------------------------------------------------ 8259( 9) - 02/07/01 09:32 - [ 2] Observations Description ------------------------ Overall, we aim to obtain for each object red and green continuum images as well as OIII and HAlpha line images. Together, these will be used to define the geometry of the continuum, the dust, the emission region, and the excitation. The emission maps will allow correct choice of slit location for the STIS observation, which will yield velocity profile information across the nucleus and out into the emission region. More specifically : WFPC2 : we will use the Linear Ramp Filters to target the OIIILambda5007 and HLambda lines. We will use the broader band filters F547M and F814W for both off-band and our red/green continuum images. The F814W filter is completely emission free, while the F547M filter includes Lambda5007 at significantly reduced throughput, so we anticipate little problem in generating pure line and pure continuum images. This combination of 4 filters nicely fits in one orbit (see below) and has been sucessfully used before on simlar emission line studies of Seyferts (eg a number of projects by A.S. Wilson). High resolution is important, so whenever possible we will use the PC. This includes both broad band filters and two of the four LRF filters. The other two LRF images fall on WF2. STIS : The WFPC2 observations act as Early Aquisition for the STIS slit observation. We will choose slit location carefully, oriented through the nucleus and along any axis that is evident in the OIII image (which we expect to be perpendicular to any dust lanes). We take a single exposure of 30 mins using STIS/CCD and the G430M grating with 0.2 arcsec slit (each object therefore takes a single orbit, see below). The spectral slice of 286 Angstrom is chosen to include the OIII Lambda4959, 5007 lines and, if possible, HBeta. At a velocity resolution of 40 km s^-1 this is adequate to resolve the OIII profile and identify any velocity structure. Exposures : \ \ WFPC2 : The integrated OIIILambda5007 line fluxes are 4-10 * 10^-13 erg s^-1 cm^-2. This is likely to be strongly pe aked towards the nucleus, but if we assume it is uniformly spread over 1 arcsec, we estimate a count rate of 1-5 e/s/pix in the WF camera (5\ min integrations we get total counts of 840 - 4200 and S/N 30 - 60 per pixel). The wide band filters are factors 10 - 40 broader and so adequate continuum subtraction can be obtained with much shorter exposure. We assign 3-4 minutes to these filters, which will give S/N = 5-50/pix in the near nuclear regions to study continuum and color morphology (we estimate fluxes from archive F606W PC images from Malkan's project). With 4 exposures, each CR-SPLIT, our overheads are significant, and for a typical orbit, we can allocate exposures of 6-7 mins for the LRF images and 3-4 mins for the broader band images. (We note, again, that this approach has been found adequate in other similar contexts). STIS : For the STIS exposures, we find that a single orbit exposure will give adequate S/N to trace the OIII profile. Aquisition requires 9 minutes for guide stars and typical ly 8 minutes for STIS aquisition ( our objects have bright compact nuclei). We have 5 minutes overhead for the first CCD exposure and 1 minute overhead for a CRSPLIT. Thus, we have 23 minutes overhead in an orbit, leaving about 30 minutes for a single exposure. Adopting the OIII line fluxes given above, and assuming this emission is spread in wavelength over the asymmetric line profile, and spread in area over ~ 0.4 arcsec we derive S/N ~ 4 per pixel for the weak flux in the line wings, rising to 30 per pixel right in the line core (integrating over two spatial elements along the slit). Thus, we should be able to follow the line profile in detail across the nuclear region --- a principal aim of the proposal. Target Aquisition : \ \ Our WFPC2 observations will provide good images with which to plan the STIS aquisitions. We do not anticipate any difficulties since the objects have bright nuclei(as seen in the SNAP survey of Malkan). Real Time Justification ----------------------- For each objects we require the WFPC2 observations to be done before the STIS observations, since they help define the slit location. We also require specific slit orientations, though they cannot be defined until following the WFPC2 observations. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 8259( 9) - 02/07/01 09:32 - [ 3] Data Distribution Paper Products: YES Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 8259( 9) - 02/07/01 09:32 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4507 GALAXY, SEYFERT, SPIRAL RA=12H 35M 36.765S +/- 0.2", J2000 Z = SURF-CONT(6060)=10+/-5e-16 DEC=-39D 54' 33.73" +/- 0.2", 0.0119 SURF-LINE(5007)=100+/-30e-15 PLATE-ID=00ZD SURF-LINE(6563)=100+/-30e-15 B = 12.92+/-0.2 V = 12.07+/-0.1 Coordinate Source: Comments: V and B mags are integrated, from RC3 Continuum flux at 6060 taken at about 0.5 arcsec from nuc in Malkan's F606W image Line flux taken from ground based small aperture and assumes spread over 1 arcsec and 10 A Flux for Halpha+NII is about the same as for OIII 5007 coordinate from WFPC2 F606W image, confirmed using dss. 2 NGC7674 GALAXY, SEYFERT, SPIRAL RA=23H 27M 56.739S +/- 0.2", J2000 Z = SURF-CONT(6060)=10+/-5e-16 DEC=8D 46' 43.12" +/- 0.2", 0.0291 SURF-LINE(5007)=50+/-20e-15 PLATE-ID=0100 SURF-LINE(6563)=50+/-20e-15 B = 13.92+/-0.2 V = 13.23+/-0.2 Coordinate Source: Comments: V and B magnitudes are total, from RC3 Continuum flux at 6060 taken at about 0.5 arcsec from nuc in Malkan's F606W image Line flux taken from ground based small aperture and assumes spread over 1 arcsec and 10 A Flux for Halpha+NII is about the same as for OIII 5007 coordinates from WFPC2 PC F606W image, confirmed using dss. 3 NGC4507-2 GALAXY, SEYFERT, SPIRAL RA=12H 35M 36.58S +/- 0.2", DEC= J2000 Z = SURF-CONT(6060)=10+/-5e-16 -39D 54' 33.73" +/- 0.2", PLATE- 0.0119 SURF-LINE(5007)=100+/-30e-15 ID=00ZD SURF-LINE(6563)=100+/-30e-15 B = 12.92+/-0.2 V = 12.07+/-0.1 Coordinate Source: Comments: V and B mags are integrated, from RC3 Continuum flux at 6060 taken at about 0.5 arcsec from nuc in Malkan's F606W image Line flux taken from ground based small aperture and assumes spread over 1 arcsec and 10 A Flux for Halpha+NII is about the same as for OIII 5007 coordinate from WFPC2 F606W image, confirmed using dss. 8259( 9) - 02/07/01 09:32 - [ 5] Visit: 01 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC4507 WFPC2 IMAGE PC1 F547M CR-SPLIT=0.5 1 200 S Comments: V image to use as off-band for [OIII] line LRF ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC4507 WFPC2 IMAGE PC1 F814W CR-SPLIT=0.5 1 200 S Comments: Broad I to use as off-band for Halpha LRF ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC4507 WFPC2 IMAGE LRF LRF 5060 CR-SPLIT=0.5 1 520 S Comments: LRF should select FR533N at 0 deg placing [OIII] 5007 on WF2 ------------------------------------------------------------------------------------------------------------------------------------ 40 NGC4507 WFPC2 IMAGE LRF LRF 6630 CR-SPLIT=0.5 1 400 S Comments: LRF should select FR680N at +15 deg to put Halpha on PC1 ------------------------------------------------------------------------------------------------------------------------------------ 8259( 9) - 02/07/01 09:32 - [ 6] Visit: 02 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC7674 WFPC2 IMAGE PC1 F547M CR-SPLIT=0.5 1 200 S Comments: V image to use as off-band for [OIII] line LRF ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC7674 WFPC2 IMAGE PC1 F814W CR-SPLIT=0.5 1 200 S Comments: Broad I to use as off-band for Halpha LRF ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC7674 WFPC2 IMAGE LRF LRF 5154 CR-SPLIT=0.5 1 520 S Comments: LRF should select FR533N at +15 deg placing [OIII] 5007 on PC1 ------------------------------------------------------------------------------------------------------------------------------------ 40 NGC7674 WFPC2 IMAGE LRF LRF 6755 CR-SPLIT=0.5 1 400 S Comments: LRF should select FR680N at 0 deg to put Halpha on WF2 ------------------------------------------------------------------------------------------------------------------------------------ 8259( 9) - 02/07/01 09:32 - [ 7] Visit: 03 Visit Priority: Visit Requirements: ON HOLD FOR 01 ORIENT 191D TO 197D ORIENT 11D TO 17D On Hold Comments: On Hold for WFPC2 emission line and continuum images. These will give orientation and position for STIS slit. Additional Comments: ORIENT chosen from Visit 1 line and continuum images. (Previously, this visit was on hold). Need slit PA -31, used +45 offset to U3 axis giving ORIENT=14 and 194 with tolerance +/-3 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC4507-2 STIS/C ACQ F28X50L MIRROR CHECKBOX=3, 1 20 S CD P DIFFUSE-CENTER=FLUX-CENTROID, ACQTYPE=DIFFUSE ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC4507-2 STIS/C ACCUM 52X0.2 G430M 4961 CR-SPLIT=2 1 24 M CD ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC4507-2 STIS/C ACCUM 52X0.2 G430L 4300 CR-SPLIT=2 1 10 M CD ------------------------------------------------------------------------------------------------------------------------------------ 8259( 9) - 02/07/01 09:32 - [ 8] Visit: 04 Visit Priority: Visit Requirements: ON HOLD FOR 02 ORIENT 150D TO 170D ORIENT 330D TO 350D VISIBILITY INTERVAL 51 M On Hold Comments: On Hold for WFPC2 emission line and continuum images. These will give orientation and position for STIS slit. Additional Comments: ORIENT taken from recent line and continuum images taken in visit 2 (previously this visit was on hold). Want slit PA 115. Used +45 offset to U3 axis, giving ORIENT 160 and 340 with tolerance +/-5 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC7674 STIS/C ACQ F28X50L MIRROR CHECKBOX=3, 1 20 S CD P DIFFUSE-CENTER=FLUX-CENTROID, ACQTYPE=DIFFUSE ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC7674 STIS/C ACCUM 52X0.2 G430M 5093 CR-SPLIT=2 1 19 M MAX DUR CD ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC7674 STIS/C ACCUM 52X0.2 G430L 4300 CR-SPLIT=2 1 10 M MAX DUR CD ------------------------------------------------------------------------------------------------------------------------------------ 8259( 9) - 02/07/01 09:32 - [ 9] Summary Form for Proposal 8259 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PC1 LRF F28X50LP 52X0.2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 STIS/CCD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ACQ ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=0.5 ACQTYPE=DIFFUSE CR-SPLIT=2 DIFFUSE-CENTER=FLUX-CENTROID ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ON HOLD FOR 01 ORIENT 191D TO 197D ORIENT 11D TO 17D ON HOLD FOR 02 ORIENT 150D TO 170D ORIENT 330D TO 350D VISIBILITY INTERVAL 51 M MAX DUR ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F547M F814W LRF MIRROR G430M G430L ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC4507 NGC7674 NGC4507-2 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 5060 6630 5154 6755 4961 4300 5093 ------------------------------------------------------------------------------------------------------------------------------------