9469( 3) - 10/17/02 11:35 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9469 Version: 3 Check-in Date: 17-Oct-2002 11:34:38 1.Proposal Title: NGC 4303: A Seyfert 2 nucleus powered by stars? ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 11 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Luis Colina Instituto de Estructura de la Materia CoI: Dr. Rosa Gonzalez-Delgado Instituto de Astrof'\i sica de Andaluc'\i N a CoI: Dr. Claus Leitherer Space Telescope Science Institute N CoI: Dr. Miguel Mas-Hesse Laboratorio de Astrof'\i sica Espacial N ------------------------------------------------------------------------------------ 5. Abstract NGC 4303 is to date the best example of the claimed starburst- AGN connection. HST images have unveiled the existence of an unresolved (size <= 4 pc) UV-optical-NIR bright core connected with a star-forming spiral (radius ~ 250 pc). The STIS UV spectrum of the core shows prominently the characteristic broad absorption lines produced by the winds of massive young stars, and it is best fitted with the synthesised spectrum of a massive, young (<= 5 Myr) stellar cluster. Ground-based optical spectra of the nucleus containing the bright core, place it at the borderline of low-excitation Seyfert 2 and LINER nuclei. STIS 0.1^'' slit spectroscopy of the unresolved core is requested to obtain an unambiguous AGN classification of it, and to measure its enclosed mass, i.e. determine the presence and mass of the black-hole. In addition, the spectra will be combined with evolutionary spectral synthesis and photoionization models to quantify the relative AGN and stellar energy contributions. If the Seyfert classification is confirmed, NGC 4303 will be the first ever detected galaxy with a Seyfert nucleus where the ionizing and bolometric energy output of its core (size <= 4 pc) could be dominated by a massive stellar cluster of young stars, as implied by the STIS UV spectrum. NGC 4303 will also be one of the few Seyferts for which the mass enclosed within the inner few pc would have been determined independently from stellar and gas kinematics. ------------------------------------------------------------------------------------ 9469( 3) - 10/17/02 11:35 - [ 2] Observations Description ------------------------ optical and UV spectrum of NGC 4303 covering the entire 0.2 to 1.0 micron region in low resolution. High resolution spectra around [OIII] and the nir CaT will also be obtained. There are two visits: one for the optical observations with a total of four orbits, and the second one for the UV-MAMA observations Real Time Justification ----------------------- no need for real time Calibration Justification ------------------------- contemporaneous flats are requested to calibrate the G750M and G750L observations. Additional Comments ------------------- ------------------------------------------------------------------------------------ 9469( 3) - 10/17/02 11:35 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4303 GALAXY, SPIRAL, RA=12H 21M 54.93S +/- 0.2", J2000 Z = V = 9.7+/-0.1 SEYFERT, STARBURST DEC=04D 28' 25.3" +/- 0.2", 0.0052 PLATE-ID=01UQ Coordinate Source: HST_IMAGE Comments: The coordinates for NGC4303 correspond to that of the core of the galaxy as given in table 1 of Colina et al. 1997, ApJ 484, L41. These coordinates were obtained using the WFPC2 F218W image of NGC 4303 obtained for program 6358. 9469( 3) - 10/17/02 11:35 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.325 Coordinate_Frame POS-TARG Pattern_Orient 90 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 9469( 3) - 10/17/02 11:35 - [ 5] Visit: 01 Visit Priority: Visit Requirements: ORIENT 85D TO 85D ORIENT 265D TO 265D BETWEEN 01-Feb-2003 AND 15-Mar-2003 SCHED 40% On Hold Comments: Additional Comments: This visit consist of (1) an acquisition using the wide optical filter F28X50LP for a diffuse source and (2) CCD observations using the 52x0.2 slit along PA40 or PA220 on the sky (corresponds to an ORIENT of PA85 or PA265). The orientation of the slit is such that goes through the core of the galaxy and through region G (brightest UV circumnuclear region; see Colina et al. 1997 ApJ 484, L41). The target + slit orientation constrains are such that the observations can only be scheduled during February 2003. A fine lock with two guide stars (GS) is a requirement with the actual structure of the visit. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC4303 STIS/C ACQ F28X50L MIRROR ACQTYPE=DIFFUSE,CHECKBOX=7, 1 30 S CD P DIFFUSE-CENTER=FLUX-CENTROID Comments: This exposure contains the target acquisition using the wide optical filter F28X50LP for a diffuse source. The target acquisition simulator has been used together with the WFPC2 F606W image of NGC 4303 to establish the best acquisition strategy. A checkbox of 7 with a flux-centroid algorithm works fine. The WFPC2 F606W shows a bright point-like source at the center of the galaxy with a diffuse component. ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC4303 STIS/C ACCUM 52X0.2 G430M 4961 CR-SPLIT=3 1 2160 S CD ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC4303 STIS/C ACCUM 52X0.2 G430L 4300 CR-SPLIT=3 1 1200 S CD ------------------------------------------------------------------------------------------------------------------------------------ 40 NGC4303 STIS/C ACCUM 52X0.2 G750L 7751 CR-SPLIT=3 1 1245 S CD ------------------------------------------------------------------------------------------------------------------------------------ 50 CCDFLAT STIS/C ACCUM 52X0.2 G750L 7751 2 DEF CD Comments: Fringe flat for G750L using the long slit (better for diffuse sources). **Do not move MSM between the science exposure (exposure # 40) and this calibration exposure** ------------------------------------------------------------------------------------------------------------------------------------ 60 CCDFLAT STIS/C ACCUM 0.3X0.0 G750L 7751 2 DEF CD 9 Comments: Fringe flat for G750L using the short slit (better for point sources). **Do not move MSM between the science exposure (exposure # 40) and this calibration exposure** ------------------------------------------------------------------------------------------------------------------------------------ 9469( 3) - 10/17/02 11:35 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 70 NGC4303 STIS/C ACCUM 52X0.2 G750M 8561 CR-SPLIT=2 1 1360 S PATTERN 1 70 CD Comments: A dithering pattern of four points along the slit is used to remove any residual flat-field effects. Total integration time is 5440 seconds. ------------------------------------------------------------------------------------------------------------------------------------ 80 CCDFLAT STIS/C ACCUM 52X0.2 G750M 8561 2 DEF CD Comments: fringe flat for G750M using the short slit (better for point-like sources). **Do not move MSM between the science exposure (exposure # 70) and this calibration exposure** ------------------------------------------------------------------------------------------------------------------------------------ 90 CCDFLAT STIS/C ACCUM 0.3X0.0 G750M 8561 2 DEF CD 9 Comments: fringe flat for G750M using the short slit (better for point-like sources). **Do not move MSM between the science exposure (exposure # 70) and this calibration exposure** ------------------------------------------------------------------------------------------------------------------------------------ 9469( 3) - 10/17/02 11:35 - [ 7] Visit: 02 Visit Priority: Visit Requirements: ORIENT 85D TO 85D ORIENT 265D TO 265D BETWEEN 01-Feb-2003 AND 15-Mar-2003 SAME ORIENT AS 01 SCHED 40% On Hold Comments: Additional Comments: This visit consist of (1) an acquisition using the wide optical filter F28X50LP for a diffuse source and (2) UV MAMA observations using the 52x0.2 slit along PA40 or PA220 on the sky (corresponds to an ORIENT of PA85 or PA265). The orientation of the slit is such that goes through the core of the galaxy and through region G (brightest UV circumnuclear region; see Colina et al. 1997 ApJ 484, L41). The target + slit orientation constrains are such that the observations can only be scheduled during February 2003. A fine lock with two guide stars (GS) is a requirement with the actual structure of the visit. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC4303 STIS/C ACQ F28X50L MIRROR ACQTYPE=DIFFUSE,CHECKBOX=7, 1 30 S CD P DIFFUSE-CENTER=FLUX-CENTROID Comments: This exposure contains the target acquisition using the wide optical filter F28X50LP for a diffuse source. The target acquisition simulator has been used together with the WFPC2 F606W image of NGC 4303 to establish the best acquisition strategy. A checkbox of 7 with a flux-centroid algorithm works fine. The WFPC2 F606W shows a bright point-like source at the center of the galaxy with a diffuse component. ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC4303 STIS/N ACCUM 52X0.2 G230L 2376 1 2250 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 9469( 3) - 10/17/02 11:35 - [ 8] Summary Form for Proposal 9469 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F28X50LP 52X0.2 0.3X0.09 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=DIFFUSE CHECKBOX=7 DIFFUSE-CENTER=FLUX-CENTROID CR-SPLIT=3 CR-SPLIT=2 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 85D TO 85D ORIENT 265D TO 265D BETWEEN 01-Feb-2003 AND 15-Mar-2003 SCHED 40% PATTERN 1 70 ORIENT 85D TO 85D ORIENT 265D TO 265D BETWEEN 01-Feb-2003 AND 15-Mar-2003 SAME ORIENT AS 01 SCHED 40% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G430M G430L G750L G750M G230L ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC4303 CCDFLAT ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 4961 4300 7751 8561 2376 ------------------------------------------------------------------------------------------------------------------------------------