!  File:  2801C.PROP
!  Database:  PEPDB
!  Date:  17-FEB-1994:14:28:55

coverpage:

  title_1:         IMAGING THE ARC IN THE GALAXY CLUSTER 2244-02
    sci_cat:       GALAXIES & CLUSTERS
    proposal_for:  GO/AM
    pi_title:      MR.
    pi_fname:      RAY
    pi_lname:      STERNER
    pi_inst:       APPLIED PHYSICS LAB (JHU)
    pi_country:    USA
    pi_phone:      505-437-8695
    keywords_1:    INTERACTING GALAXY, DISTANT GALAXY CLUSTER,
    keywords_2:    GRAVITATIONAL LENS, STELLAR WINDS, STAR BURST, INTRACLUSTER GAS
    hours_pri:     1.50
    num_pri:       1
    wf_pc:         X
    pi_position:   AMATEUR ASTRONOMER
! end of coverpage

abstract:

    line_1:        It is proposed to image the arc in the galaxy cluster 2244-02 to search for
    line_2:        evidence that it is composed of stars and not a gravitationally lensed
    line_3:        background galaxy, as currently thought. A galaxy collision model has been
    line_4:        found that appears able to explain both the morphology of the arc and also
    line_5:        possibly the color and brightness. This collision model also fits with the
    line_6:        newly discovered double radio source in this cluster. The model suggests that
    line_7:        the amount of intracluster gas passing through the arc is sufficient to account
    line_8:        for the observed luminosity if a reasonable fraction of it were converted into
    line_9:        high mass stars. One of the goals is to look for any trace of nebulosity along
    line_10:       the edge of the arc that would indicate that such gas is actually being
    line_11:       collected. If the model is verified it would be the first case of propagating
    line_12:       star formation in an intracluster medium. High spatial resolution is needed so
    line_13:       the HST WF/PC would be used.

!
! end of abstract

general_form_proposers:

  lname:           STERNER
    fname:         RAY
    title:         P.I.
    inst:          APPLIED PHYSICS LAB (JHU)
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        I propose to image the arc using the WFC positioned
    line_2:        so the arc falls entirely on W2.  The baum spot will
    line_3:        be positioned so that it does not fall on the arc.
    line_4:        The orientation of the image is selected to include
    line_5:        the radio source somewhere on one of the 4 PC image
    line_6:        chips.  The wide-band visual filter will be used.
    line_7:        The surface brightness measured from the ground is
    line_8:        very low so only a single, long exposure will be made.

!

  question:        5
    section:       1
    line_1:        THE SURFACE BRIGHTNESS OF THE ARC IS QUITE LOW. THE ONLY
    line_2:        ESTIMATE AVAILABLE IS 23.6 V MAG/ARCSEC SQ BUT THIS IS
    line_3:        PROBABLY NOT VERY RELIABLE.  HOWEVER, USING THIS NUMBER
    line_4:        GIVES A SURFACE BRIGHTNESS OF ABOUT 30 V MAG PER SQ PIXEL
    line_5:        WHICH MAY BE UNDETECTABLE.  THE BRIGHTNESS DISTRIBUTION OF
    line_6:        THE ARC IS KNOWN TO BE NON-UNIFORM AND IF IT IS CLUMPY
    line_7:        ENOUGH THEN DETECTION WILL BE NO PROBLEM.  UNFORTUNATELY
    line_8:        IT APPEARS TOO FAINT FOR MORE THAN A SINGLE BROAD BAND IMAGE
    line_9:        AND UNLESS IT IS MORE CONCENTRATED THAN CAN BE DETERMINED
    line_10:       NOW IT WILL NEED ALL OF THE AVAILABLE ALLOCATED TIME.

!
!end of general form text

general_form_address:

  lname:           STERNER
    fname:         RAY
    title:         DR.
    category:      PI
    inst:          APPLIED PHYSICS LAB (JHU)
    city:          LAUREL
    state:         MD
    country:       USA
    phone:         301-792-5000

!
! end of general_form_address records

fixed_targets:

    targnum:       1
    name_1:        CL2244-02-ARC
    descr_1:       GALAXY CLUSTER; DISTANT GALAXY CLUSTER;
    descr_2:       INTERACTING GALAXY; GRAVITATIONAL LENS
    pos_1:         PLATE-ID=015P,
    pos_2:         RA = 22H 44M 37.66S +/- 1",
    pos_3:         DEC = -2D 21' 29.0" +/- 1"
    equinox:       1950
    pm_or_par:     NO
    rv_or_z:       Z = 0.329
    comment_1:     FLUX FROM LYNDS,
    comment_2:     PETROSIAN, AP. J.
    comment_3:     336:1, 1 JAN 1989.
    fluxnum_1:     1
    fluxval_1:     SURF(V) = 23.6
    fluxnum_2:     2
    fluxval_2:     B-V = 0.92

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    targname:      CL2244-02-ARC
    config:        WFC
    opmode:        IMAGE
    aperture:      W2
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  1200S
    fluxnum_1:     1
    priority:      1
    param_1:       CR-SPLIT=NO
    req_1:         CYCLE 1;
    req_2:         GROUP 1-2 NO GAP;
    comment_1:     MUST BE SCHEDULED OUTSIDE SAA.

!

    linenum:       2.000
    targname:      CL2244-02-ARC
    config:        WFC
    opmode:        IMAGE
    aperture:      W2
    sp_element:    F555W
    num_exp:       3
    time_per_exp:  2300S
    fluxnum_1:     1
    priority:      1
    param_1:       CR-SPLIT=NO
    req_1:         CYCLE 1;
    comment_1:     MUST BE SCHEDULED OUTSIDE SAA.

!
! end of exposure logsheet

! No scan data records found