8321( 4) - 12/01/99 10:54 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8321 Version: 4 Check-in Date: 01-Dec-1999 10:53:44 1.Proposal Title: Coordinated STIS/AXAF Spectroscopy of UV/X-ray Absorption in the Seyfert 1 Galaxy NGC 4051 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Niel Brandt The Pennsylvania State University CoI: Dr. Bev Wills University of Texas at Austin N CoI: Dr. Steven Kraemer Catholic University of America N CoI: Dr. Michael Crenshaw Catholic University of America N ------------------------------------------------------------------------------------ 5. Abstract X-ray studies of the nearby Seyfert 1 galaxy NGC 4051 reveal strong and complex absorption by ionized nuclear gas (a `warm absorber'). This gas is a major component of the nuclear environment, and we will soon use AXAF to make the first grating- resolution study of the X-ray warm absorber in NGC 4051. Here we propose simultaneous or near-simultaneous STIS UV spectroscopy. Many Seyferts/quasars with X -ray warm absorbers also show UV absorption lines (e.g. LyAlpha, N v and C iv), and it has been argued that the X-ray and UV absorption arise in the same gas. NGC 4051 shows evidence for C iv absorption in IUE spectra, and combined STIS/ AXAF spectra will allow us to critically test the unified UV/X-ray absorber model by comparing the velocity fields and strengths of the UV/X-ray absorption. We will also derive superior constraints upon the internal velocity structure, location, global covering factor, and line-of-sight covering factor of the ionized gas. NGC 4051 is a pa rticularly interesting target because, as a soft X-ray `Narrow-Line Seyfert 1' galaxy, its ionizing continuum is substantially softer than that of more `typical' Seyfert 1s (e.g. NGC 3516 and NGC 3783). This may lead to significantly different absorption characteristics. This observation will be the first HST UV spectroscopy of NGC 4051, and simultaneous observations are important because the absorption is likely to be variable. ------------------------------------------------------------------------------------ 8321( 4) - 12/01/99 10:54 - [ 2] Observations Description ------------------------ We will take E140M spectra of the nucleus of the Seyfert 1 galaxy, NGC 4051. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Paper Products: NO Media: ELECTRONIC Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 8321( 4) - 12/01/99 10:54 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4051 GALAXY, SEYFERT RA=12H 3M 9.6S +/- 0.05S, J2000 Z = V = 13.0 DEC=44D 31' 52.8" +/- 0.5" 0.0024 8321( 4) - 12/01/99 10:54 - [ 4] Visit: 01 Visit Priority: Visit Requirements: SCHED 100% BETWEEN 19-Mar-2000 AND 26-Mar-2000 On Hold Comments: Additional Comments: Coordinated with Chandra observations. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC4051 STIS/C ACQ F28X50L MIRROR 1 1.0 S ONBOARD ACQ FOR 20, 30, CD P 40, 50 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC4051 STIS/F ACCUM 0.2X0.2 E140M 1425 1 36.0 M UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC4051 STIS/F ACCUM 0.2X0.2 E140M 1425 1 45.0 M UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 40 NGC4051 STIS/F ACCUM 0.2X0.2 E140M 1425 1 45.0 M UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 50 NGC4051 STIS/F ACCUM 0.2X0.2 E140M 1425 1 45.0 M UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 8321( 4) - 12/01/99 10:54 - [ 5] Summary Form for Proposal 8321 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F28X50LP 0.2X0.2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHED 100% BETWEEN 19-Mar-2000 AND 26-Mar-2000 ONBOARD ACQ FOR 20, 30, 40, 50 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR E140M ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC4051 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 1425 ------------------------------------------------------------------------------------------------------------------------------------