5805(  0) - 07/18/95 18:03  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      5805
                                                       Version: **********
                                                       Check-in Date: **********

1.Proposal Title:
Ultraviolet/X-ray Absorbing Outflows in Quasars and AGN
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2. Scientific Category   3. Proposal For  4. Cycle
Quasars                     AR               5
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5. Investigators
                                                                                     Contact?
    PI: Dr. Smita Mathur                  Smithsonian Astrophysical Observatory
   CoI: Dr. Martin Elvis                  Smithsonian Astrophysical Observatory         N
   CoI: Dr. Belinda Wilkes                Smithsonian Astrophysical Observatory         N

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6. Abstract

Intrinsic ``associated'' absorption has been a well known but little understood
phenomenon in ultraviolet (UV) studies of both low and high luminosity active
galactic nuclei (AGN) and in X-ray observations of the former.  Recently it has
become evident that a form of X-ray absorption is also common in high luminosity
quasars. The identity of the absorber is not established in either case.  In a
recent study of 3C351 we have demonstrated, using both UV and X-ray data, that the
associated UV metal lines and the soft X-ray absorption are due to the same
material. This is the first confirmed UV/X-ray absorber and the combination of
constraints provided by both datasets is  powerful in determining the physical
conditions and ionization state of the absorber, which we determine to be low
density, highly ionized, outflowing material situated outside the broad line region.
This is a previously unknown component of nuclear material. Following the result in
3C351, we have shown that the UV and X-ray absorbers are one and the same in two
more AGN: 3C212 and NGC5548. We propose to analyze archival HST UV spectra for 4 AGN
with known, ionized X-ray absorbers in search of other UV/X-ray absorbers. The
resulting dataset will allow us to investigate the properties of the absorbing
material with unprecedented accuracy.
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  Observations Description
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  Real Time Justification
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  Calibration Justification
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  Additional Comments
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                                                5805(  0) - 07/18/95 18:03  - [  2]

  Data Distribution

  Media:           8MM
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:        UPS
  Email:                                                              ,
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                                                5805(  0) - 07/18/95 18:03  - [  3]

            Summary Form for Proposal  5805

  Item                         Used in this proposal
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  Proposal Category            AR
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  Scientific Category          Quasars
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