! Proposal 6464, submission 1
! PI: Dante Minniti
! Received Wed Feb 7 12:45:45 EST 1996
! From: dminniti@igpp.llnl.gov
! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template
! $Id: 6464,v 3.1 1996/02/12 15:00:17 pepsa Exp $
! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template
! $Id: 6464,v 3.1 1996/02/12 15:00:17 pepsa Exp $
!
! Refer to the HST Phase II Proposal Instructions to fill this out
!
! Anything after a "!" is ignored, and may be deleted
!
! All keywords with multiple entries are comma delimited except the
! Visit_Requirements and Special_Requirements keywords which can be
! delimited with carriage returns or semi-colons, but not commas
!
! For help call your Program Coordinator: Sleiman
! Phone: 410-338-4753 , E-mail: sleiman@stsci.edu
!
! This partially completed template was generated from a Phase I proposal.
! Name of Phase I Proposal: archive-0213.minniti.prop
! Date generated: Fri Dec 22 18:11:51 EST 1995
!
Proposal_Information ! Section 4
Title: RESOLVING STARS AROUND THE NEAREST KNOWN
SEYFERT 1 NUCLEUS
Proposal_Category: GO
Scientific_Category: AGN
Cycle: 6
Investigators
PI_name: Dante Minniti
PI_Institution: Lawrence Livermore National Laboratory
CoI_Name: Pascale Jablonka
CoI_Institution: Observatoire de Paris Meudon
Contact: ! Y or N (designate at most one contact)
CoI_Name: Alex Filippenko
CoI_Institution: University of California, Berkeley
Contact: ! Y or N (designate at most one contact)
CoI_Name: Robert Fosbury
CoI_Institution: Hubble Space Telescope, European Coordinating
Facility
Contact: ! Y or N (designate at most one contact)
CoI_Name: Joseph Shields
CoI_Institution: Steward Observatory
Contact: ! Y or N (designate at most one contact)
Abstract: ! Free format text (please update)
NGC 4395 is the least luminous and nearest known Seyfert 1
galaxy, serendipitously discovered by Filippenko & Sargent
(1989). We propose to obtain deep BVI images of the nuclear
region of this galaxy with the WFPC2, in order to make color-
magnitude and color-color diagrams of the surrounding stars.
These will allow us to determine: 1) the distance to NGC 4395,
2) the ages of the young populations around the Seyfert
nucleus, 3) the ages of the old populations, and 4) their
metal abundances. Our overall goal is to study how an AGN
influences the circumnuclear stellar population, as well as
stellar influences on nuclear activity. NGC 4395 is an
important target for study since it is nearby, is almost face
on, does not have a bulge, and apparently is subject to little
extinction by dust in its central region. This proposal
focuses on the stellar content around the active nucleus, an
aspect yet unstudied, that will be complemented with the
following ground and space based observations: 1) HST pre-
repair optical imaging and UV spectroscopy 2) ISO emission-
line spectroscopy, 3) Lick imaging and spectroscopy, and 4)
Keck high resolution spectroscopy. Using the superb resolution
of WFPC2 we would be able to directly test the effects of an
active nucleus on the star formation history of an otherwise
normal galaxy.
Questions ! Free format text (please update)
Observing_Description:
The proposed images need to be deep enough in V and I to
resolve the RGB tip (I_0 = -4.0) for the old stellar
component, and photometry in B must be go sufficiently faint
to measure the brightness of the blue main sequence with ages
younger than ~ 10^8 yr (B_0 ~ -5). The corresponding
limiting apparent magnitudes depend on the distance adopted,
and for purposes of this proposal we conservatively adopt the
large distance of Sandage (1988), D = 6.5 Mpc. The limiting
magnitudes (S/N = 10) that we want to reach are thus B=24.1,
V=26.6, and I = 25.1, corresponding to total exposure times
of 10500, 2700, and 2400 sec for these bandpasses,
respectively. These exposure times, computed using the new
WFPC2 time calculator, add up to a total of 6 orbits., We
have observed distant galaxies (D=1.5--2 Mpc) with the ESO
NTT under superb seeing conditions, resolving at the limit
the stars in the RGB tip (Minniti & Zijlstra 1995). However,
our experience with these data indicate that similar
observations of the nuclear region of NGC 4395 would not
resolve the individual stars due to crowding. We have
computed the expected number of tip red giant branch stars
per unit area corresponding to the observed surface
brightness in this region, following the procedure outlined
by Renzini (1992). The resulting ~1 star/arcsec^2 determines
that only HST can achieve the required resolution., In order
to obtain the best possible sampling and photometry, we will
use the dithering techniques developed at ST-ECF and STScI
(e.g. Dickinson & Fosbury 1995, Adorf 1995). We will use
DAOPHOT II, and APPHOT to do the photometric measurements,
deciding from their comparative performances which one is
best in this case., References, Adorf, H.-M. 1995, ST-ECF
Newsletter No. 23, p. 19 Dickinson, M., & Fosbury, R. 1995,
ST-ECF Newsletter No. 22, p. 14 Minniti, D., & Zijlstra, A.
1995, ApJ, to be submitted Renzini, A. 1992, in IAU Symp.
153 ``Galactic Bulges", eds. H. Dejonghe & H. Habing
(Dordrecht: Kluwer), p. 151 Sandage, A. 1988, ApJ, 331, 605
Real_Time_Justification:
None.
This proposal focuses on the stellar content around the
active nucleus, an aspect yet unstudied, that will be
complemented with the following ground and space based
observations: 1) HST pre-repair imaging and spectroscopy, 2)
ISO observations, 3) Lick imaging and spectroscopy, and 4)
Keck spectroscopy. We will probably request deep K band
photometry with HST + NICMOS in the next cycles.
Calibration_Justification: ! Move appropriate text from Real_Time_Justification
Additional_Comments:
Fixed_Targets ! Section 5.1
Target_Number: 1
Target_Name: NGC4395
Alternate_Names:
Description: Galaxy,Seyfert
Position: RA=12H 25M 48.80S +/- 0.1S, DEC=33D 32' 47.8" +/- 1",
! PLATE-ID=0000
Equinox: J2000
RV_or_Z: V=+317
RA_PM: 0.0 ! Units are seconds of time per year
Dec_PM: 0.0 ! Units are seconds of arc per year
Epoch:
Annual_Parallax: 0.0
Flux: V=17.0 +/- 0.5, B-V=0.36 +/- 0.2 ! Include at least V and B-V
Comments: Magnitude and color of the Seyfert nucleus listed.
! This is a template for a single visit containing a single exposure
! Repeat exposure and visit blocks as needed
Visits ! Section 6
Visit_Number: 1
Visit_Requirements: ! Section 7.1
! Uncomment or copy visit level special requirements needed
! Most of these requirements (including ORIENT) will limit scheduling
! PCS MODE [Fine | Gyro]
! GUIDing TOLerance <angle>
! DROP TO GYRO IF NECESSARY [NO REACQuisition]
! ORIENTation <angle1> TO <angle2>
! ORIENTation <angle1> TO <angle2> FROM <visit>
! ORIENTation <angle1> TO <angle2> FROM NOMINAL
! SAME ORIENTation AS <visit>
! CVZ
! PARallel
! SCHEDulability <percentage>
! AFTER <visit> [BY <time1> [TO <time2>]]
! AFTER <date>
! BEFORE <date>
! BETWEEN <date1> AND <date2>
! GROUP <visit-list> WITHIN <time>
! PERIOD <time> AND ZERO-PHASE <date>
! SEQ <visit-list> WITHIN <time>
! ON HOLD [FOR <visit-list>]
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 1 ! Section 6.5
Target_Name: NGC4395
Config: WFPC2
Opmode: IMAGE
Aperture: PC1-FIX
Sp_Element: F555W
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: 1000S
Special_Requirements: ! Section 7.2
! Uncomment or copy exposure level special requirements needed
! INTeractive ACQuisition FOR <exp-list>
! ONBOARD ACQuisition FOR <exp-list>
! SAVE OFFSET <id>
! USE OFFSET <id>
! POSition TARGet <x-value>,<y-value>
! SAME POSition AS <exp>
! DO FOR TARGets <targ-list> ! FGS only
! PARallel WITH <exp>
! GROUP-FGS <exp-list> WITHIN <time>
! SPATIAL SCAN <#> [<exp-list> | SINGLE-EXP ]
! RT ANALYSIS [FOR <exp-list>]
! REQuires UPLINK
! REQuires EPHEMeris CORRection <id>
! END ORBIT
! EXPAND
! LOW-SKY
! MAXimum DURation [<time> | <%>]
! MINimum DURation [<time> | <%>]
! NO SPLIT
! PHASE <number1[0,1]> TO <number2[0,1]>
! SEQuence <exp-list> NON-INTerruptible
! SHADOW
Comments:
Exposure_Number: 2 ! Section 6.5
Target_Name: NGC4395
Config: WFPC2
Opmode: IMAGE
Aperture: PC1-FIX
Sp_Element: F555W
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: 1100S
Special_Requirements: ! Section 7.2
! Uncomment or copy exposure level special requirements needed
Comments:
Exposure_Number: 3 ! Section 6.5
Target_Name: NGC4395
Config: WFPC2
Opmode: IMAGE
Aperture: PC1-FIX
Sp_Element: F555W
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: 500S
Special_Requirements: ! Section 7.2
! Uncomment or copy exposure level special requirements needed
Comments:
Exposure_Number: 4 ! Section 6.5
Target_Name: NGC4395
Config: WFPC2
Opmode: IMAGE
Aperture: PC1-FIX
Sp_Element: F814W
Wavelength:
Optional_Parameters: DITHER-TYPE=LINE
Number_of_Iterations: 1
Time_Per_Exposure: 80S
Special_Requirements: ! Section 7.2
! Uncomment or copy exposure level special requirements needed
Comments:
Exposure_Number: 5 ! Section 6.5
Target_Name: NGC4395
Config: WFPC2
Opmode: IMAGE
Aperture: PC1-FIX
Sp_Element: F439W
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: 1100S
Special_Requirements: ! Section 7.2
! Uncomment or copy exposure level special requirements needed
Comments:
Exposure_Number: 6 ! Section 6.5
Target_Name: NGC4395
Config: WFPC2
Opmode: IMAGE
Aperture: PC1-FIX
Sp_Element: F814W
Wavelength:
Optional_Parameters: DITHER-TYPE=LINE
Number_of_Iterations: 1
Time_Per_Exposure: 1000S
Special_Requirements: ! Section 7.2
! Uncomment or copy exposure level special requirements needed
Comments:
Exposure_Number: 7 ! Section 6.5
Target_Name: NGC4395
Config: WFPC2
Opmode: IMAGE
Aperture: PC1-FIX
Sp_Element: F439W
Wavelength:
Optional_Parameters: DITHER-TYPE=LINE
Number_of_Iterations: 1
Time_Per_Exposure: 1000S
Special_Requirements: ! Section 7.2
! Uncomment or copy exposure level special requirements needed
Comments:
Exposure_Number: 8 ! Section 6.5
Target_Name: NGC4395
Config: WFPC2
Opmode: IMAGE
Aperture: PC1-FIX
Sp_Element: F439W
Wavelength:
Optional_Parameters: DITHER-TYPE=LINE
Number_of_Iterations: 1
Time_Per_Exposure: 1000S
Special_Requirements: ! Section 7.2
! Uncomment or copy exposure level special requirements needed
Comments:
Exposure_Number: 9 ! Section 6.5
Target_Name: NGC4395
Config: WFPC2
Opmode: IMAGE
Aperture: PC1-FIX
Sp_Element: F439W
Wavelength:
Optional_Parameters: DITHER-TYPE=LINE
Number_of_Iterations: 1
Time_Per_Exposure: 1000S
Special_Requirements: ! Section 7.2
! Uncomment or copy exposure level special requirements needed
Comments:
Data_Distribution ! Defaults indicated; change if desired
Medium: 8MM ! 8MM or 6250BPI or 1600BPI
Blocking_Factor: 10 ! 10 or 1
! Only astronomers with very old 9-
! track tape drives should consider
! a blocking factor of 1
Ship_To: L.L.N.L.
MS L 413
P.O. Box 808
Livermore
CA 94550
!
!
Ship_Via: UPS ! UPS (2-day) or OVERNIGHT
! Overnight shipping done at PI expense
Recipient_Email: dminniti@igpp.llnl.gov
! Needed if Ship_To: is not PI_Address
! <free-text>
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