!   $Id: 5211,v 8.1 1994/08/02 18:39:38 pepsa Exp $
coverpage:
title_1: high-resolution imaging of nearby nuclear starbursts
title_2:
sci_cat: galaxies & clusters
sci_subcat: starbursts
proposal_for: gto/wf2
large_proj:
key_proj:
targ_of_opp:
hours_pri: 4.711
hours_par: 0
num_pri: 3
num_par: 0
wf_pc: y
realtime: n
time_crit: y
sc_time: 8.17
pgm_eff: 57.7
pi_fname: john
pi_lname: trauger
pi_inst: 2370
pi_country: usa
pi_esa: n
abstract:
line_1: we plan to investigate three nearby nuclear starbursts to determine
line_2: their structure on parsec scales. we shall image ngc253, ngc2903, and
line_3: ngc4736 from the uv to the nir in four colours, and from these images
line_4: determine the distribution of stars within the nucleus and construct
line_5: accurate colour-magnitude diagrams for the luminous stars. unresolved
line_6: starlight will allow us to chart the overall structure of the nucleus
line_7: and localize specific dust features. the distribution of young stars
line_8: and stellar clusters are of fundamental interest, and bears directly
line_9: on the physics of starbursts. we shall also image ngc253 in h-alpha
line_10: to determine the structure of warm gas in the superwind. we shall
line_11: combine these high-resolution observations with ground-based nir
line_12: imaging and spectroscopy to allow detailed study of these complex
line_13: systems.
general_form_proposers:
lname: trauger
fname: john
title: pi
inst: 2370
country: usa
lname: burrows
fname: chris
inst: stsci
country: usa
lname: clarke
fname: john
inst: univ. of michigan
country: usa
lname: crisp
fname: david
inst: jpl
country: usa
lname: hoessel
fname: john
inst: univ. of wisconsin
country: usa
lname: gallagher
fname: jay
inst: univ. of wisconsin
country: usa
lname: griffiths
fname: richard
inst: johns hopkins univ
country: usa
lname: hester
fname: jeff
inst: arizona state univ.
country: usa
lname: holtzman
fname: john
inst: lowell observatory
country: usa
lname: mould
fname: jeremy
inst: caltech
country: usa
lname: westphal
fname: james
inst: caltech
country: usa
general_form_text:
question: 3
section: 1
line_1: we plan to image the cores of 3 nearby starbursts (ngc253, ngc4736, and
line_2: ngc2903 at approximately 3, 5, and 12 mpc) with the pc in uvi and
line_3: the fuv. the wfc-ii will simultaneously image the surrounding,
line_4: less confused, regions.
line_5:
line_6: we plan to image the nucleus in ngc253 (the base of the superwind) in
line_7: h-alpha (plus off-band r) with the wfc.
line_8:
line_9: we shall split each exposure in two to allow cosmic ray events to be
line_10: detected.
line_11:
line_12: all of the broad band exposures will be read with a gain of 15 e/adu;
line_13: the narrow band exposure will be read with a gain of 7 electrons/adu.
question: 4
section: 1
line_1: these fields are extremely dense; the restored resolution of hst is
line_2: essential to allow us to examine their structure on parsec scale and to
line_3: allow us to form colour-magnitude diagrams of the brightest stars.
line_4:
line_5: we require s/n of 100 in the broad band filters -- for hot stars in the
line_6: uv filters and cool supergiants in the red filters -- to allow accurate
line_7: psf fitting photometry. ngc253 is moderately inclined, and so we will
line_8: go deeper by a factor of 2
line_9:
line_10: to avoid possible saturation from dense stellar clusters, the exposures
line_11: need to be shorter than 150s, 150s, 30s, and 100s in the four bands; we
line_12: shall take two short and two long exposures.
line_13:
line_14: to image ngc253 in h-alpha, we require a s/n of approximately 10 as we
line_15: aim mainly to explore its structure and morphology. from ground-based
line_16: long-slit observations, we have calculated that we will achieve a s/n
line_17: of about 6 in two 1800s exposures, assuming that the emission is not
line_18: clumped; we fully expect the emission will be clumped, and that in the
line_19: clumps s/n will exceed 6. we will achieve a suitably high s/n in
line_20: off-band r after 75s of exposure. the heliocentric velocity of ngc253
line_21: is only 249 km/s, so a redshifted h-alpha filter will not be required.
question: 13
section: 1
line_1: this proposal forms an important part of the `star formation in
line_2: galaxies' section of the wfpc-2 gto program.
general_form_address:
lname: trauger
fname: john
category: pi
inst: 2370
country: usa
fixed_targets:
targnum: 1
name_1: ngc253
descr_1: e,301,318,910
pos_1: ra = 00h 47m 33.1s +/- 1" ,
pos_2: dec = -25d 17' 18" +/- 1"
equinox: 2000
rv_or_z: v = +249
fluxnum_1: 1
fluxval_1: surf(v) = 18.9
fluxnum_2: 2
fluxval_2: b-v = 1.26
targnum: 2
name_1: ngc2903
descr_1: e,301,318,910
pos_1: ra = 09h 32m 09.7s +/- 1" ,
pos_2: dec = +21d 30' 02" +/- 1"
equinox: 2000
rv_or_z: v = +554
fluxnum_1: 1
fluxval_1: surf(v) = 17.9
fluxnum_2: 2
fluxval_2: b-v = 0.66
targnum: 3
name_1: ngc4736
descr_1: e,301,318,910
pos_1: ra = 12h 50m 53.6s +/- 1" ,
pos_2: dec = +41d 07' 10" +/- 1"
equinox: 2000
rv_or_z: v = +307
fluxnum_1: 1
fluxval_1: surf(v) = 15.4 +/- 1.0
fluxnum_2: 2
fluxval_2: b-v = 0.90
exposure_logsheet:
linenum: 1
sequence_1: define
sequence_2: pc-7
targname: #
config: wfpc2
opmode: image
aperture: pc1-fix
sp_element: #
num_exp: #
time_per_exp: 1s
priority: 1
param_1: cr-split = 0.6
param_2: cr-tolerance=0.2
param_3: atd-gain = 7
linenum: 2
sequence_1: define
sequence_2: pc-15
targname: #
config: wfpc2
opmode: image
aperture: pc1-fix
sp_element: #
num_exp: #
time_per_exp: 1s
priority: 1
param_1: cr-split = no
param_2: atd-gain = 15
linenum: 3
sequence_1: use
sequence_2: pc-15
targname: ngc253
sp_element: f336w
num_exp: 2
time_per_exp: x10
req_1: cycle 4 / 3-8 ;
req_2: seq 3-8 no gap ;
req_3: pcs mode f / 3-8 ;
req_4: orient 225d +/- 45d / 3-8
comment_1: roll-angle places ne bar on wfc.
linenum: 4
sequence_1: use
sequence_2: pc-15
targname: ngc253
sp_element: f336w
num_exp: 2
time_per_exp: x400
linenum: 5
sequence_1: use
sequence_2: pc-15
targname: ngc253
sp_element: f555w
num_exp: 2
time_per_exp: x10
linenum: 6
sequence_1: use
sequence_2: pc-15
targname: ngc253
sp_element: f555w
num_exp: 2
time_per_exp: x400
linenum: 7
sequence_1: use
sequence_2: pc-15
targname: ngc253
sp_element: f814w
num_exp: 2
time_per_exp: x10
linenum: 8
sequence_1: use
sequence_2: pc-15
targname: ngc253
sp_element: f814w
num_exp: 2
time_per_exp: x400
linenum: 9
sequence_1: use
sequence_2: pc-7
targname: ngc2903
sp_element: f160bw
num_exp: 2
time_per_exp: x2000
req_1: cycle 4 / 9-15 ;
req_2: seq 9-15 no gap ;
req_3: pcs mode f / 9-15 ;
req_4: orient 225d +/- 60d / 9-15
comment_1: roll-angle places n bar on wfc.
linenum: 10
sequence_1: use
sequence_2: pc-15
targname: ngc2903
sp_element: f336w
num_exp: 2
time_per_exp: x10
linenum: 11
sequence_1: use
sequence_2: pc-15
targname: ngc2903
sp_element: f336w
num_exp: 2
time_per_exp: x400
linenum: 12
sequence_1: use
sequence_2: pc-15
targname: ngc2903
sp_element: f555w
num_exp: 2
time_per_exp: x10
linenum: 13
sequence_1: use
sequence_2: pc-15
targname: ngc2903
sp_element: f555w
num_exp: 2
time_per_exp: x400
linenum: 14
sequence_1: use
sequence_2: pc-15
targname: ngc2903
sp_element: f814w
num_exp: 2
time_per_exp: x10
linenum: 15
sequence_1: use
sequence_2: pc-15
targname: ngc2903
sp_element: f814w
num_exp: 2
time_per_exp: x400
linenum: 16
sequence_1: use
sequence_2: pc-7
targname: ngc4736
sp_element: f160bw
num_exp: 2
time_per_exp: x2000
req_1: cycle 4 / 16-22 ;
req_2: seq 16-22 no gap ;
req_3: pcs mode f / 16-22 ;
req_4: orient 90d +/- 45d / 16-22
comment_1: roll-angle places rosat source 25" n
comment_2: and 48" w of nucleus on wfc.
linenum: 17
sequence_1: use
sequence_2: pc-15
targname: ngc4736
sp_element: f336w
num_exp: 2
time_per_exp: x5
linenum: 18
sequence_1: use
sequence_2: pc-15
targname: ngc4736
sp_element: f336w
num_exp: 2
time_per_exp: x200
linenum: 19
sequence_1: use
sequence_2: pc-15
targname: ngc4736
sp_element: f555w
num_exp: 2
time_per_exp: x5
linenum: 20
sequence_1: use
sequence_2: pc-15
targname: ngc4736
sp_element: f555w
num_exp: 2
time_per_exp: x200
linenum: 21
sequence_1: use
sequence_2: pc-15
targname: ngc4736
sp_element: f814w
num_exp: 2
time_per_exp: x5
linenum: 22
sequence_1: use
sequence_2: pc-15
targname: ngc4736
sp_element: f814w
num_exp: 2
time_per_exp: x200
linenum: 23
sequence_1: define
sequence_2: wf
targname: #
config: wfpc2
opmode: image
aperture: wf3-fix
sp_element: #
param_1: cr-split = no
param_2: atd-gain = 7
priority: 1
num_exp: #
time_per_exp: 1s
linenum: 24
sequence_1: use
sequence_2: wf
targname: ngc253
sp_element: f656n
num_exp: 2
time_per_exp: x1200
req_1: cycle 4 / 24-26 ;
req_2: seq 24-26 no gap ;
req_3: pcs mode f / 24-26 ;
req_4: same orient for 25-26 as 24
linenum: 25
sequence_1: use
sequence_2: wf
targname: ngc253
sp_element: f675w
num_exp: 2
time_per_exp: x5
linenum: 26
sequence_1: use
sequence_2: wf
targname: ngc253
sp_element: f675w
num_exp: 2
time_per_exp: x200
!~~~RPSS~~~,WFPC2,starburst.prop, 3-MAR-1994 12:59