Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

Intelligence Inst., USA; Davidson, J. A., Universities Space Research Association, USA; [2000]; 2p; In English; No Copyright;
Avail: Issuing Activity; Abstract Only
This paper presents polarization maps of the central 3’ x 5’ region of the W3 molecular cloud at far-infrared (60 micrometer
and 100 micrometer) and submillimeter (350 micrometer) wavelengths. We use the multi-wavelength polarization measurements
to differentiate between the emission in warm and cool dust components. We infer that the submillimeter observations trace a layer
of cool dust with high column density, which we attribute to a large scale ridge of material. This ambient ridge has an orderly
magnetic field with evidence for ”hourglass” field structure; however, the field structure is qualitatively different in size and orientation
compared to previous studies. The far-infrared measurements are dominated by warm dust surrounding evolved HII regions
or embedded young stars. The warm dust, in contrast to the ridge, has a disrupted magnetic field that varies rapidly in the plane
of the sky and along the line of sight, suggesting that the field has been distorted by the expansion of HII regions.
Author
Magnetic Field Configurations; Magnetic Clouds; Magnetic Fields; Molecular Clouds; Interstellar Gas; H II Regions
20000065649 Hawaii Univ., Inst. for Astronomy, Honolulu, HI USA
Operation of the University of Hawaii 2.2M Telescope on Mauna Kea Final Report, 1 Mar. 1997 - 28 Feb. 1999
McLaren, Robert; Hall, Donald; Jan. 26, 2000; 7p; In English
Contract(s)/Grant(s): NAG5-4355
Report No.(s): AD-A375005; 654379; No Copyright; Avail: CASI; A01, Microfiche; A02, Hardcopy
During this period the operation of the University of Hawaii’s 2.2M telescope was partially funded by this grant. The original
term of this grant was one year. Most of the grant funds were expended during this year. Subsequently a one year extension was
approved. Over the resulting 2 year period, this grant provided approximately 6% of the operating budget of the telescope. The
fraction of observing time devoted to studies of solar system objects (e.g., planets, planetary satellites, asteroids, and comets) was
approximately 26%.
DTIC
Telescopes; Astronomical Observatories
20000067638 NASA Marshall Space Flight Center, Huntsville, AL USA
Relativistically Skewed Iron Emission and Disk Reflection in Galactic Microquasar XTE J1748-288
Miller, J. M., Massachusetts Inst. of Tech., USA; Fox, D. W., Massachusetts Inst. of Tech., USA; DiMatteo, T., Harvard-Smithsonian
Center for Astrophysics, USA; Wijnands, R., Massachusetts Inst. of Tech., USA; Belloni, T., OAB, Italy; Kouveliotou, C.,
NASA Marshall Space Flight Center, USA; Lewin, W. H. G., Massachusetts Inst. of Tech., USA; [2000]; 1p; In English; No Copyright;
Avail: Issuing Activity; Abstract Only
We report evidence for an Fe K-alpha fluorescence line feature in the Very High, High, and Low state X-ray spectra of the
galactic microquasar XTE JI748-288 during its June 1998 outburst. Spectral analyses were made on observations spread across
the outburst, gathered with the Rossi X-ray Timing Explorer. Gaussian line. disk emission line, relativistic disk emission line, and
disk reflection models are fit to the data. In the Very High State, the line profile is strongly redshifted and consistent with emission
from the innermost radius of a maximally rotating Kerr black hole, 1.235 R(sub g). The line profile is less redshifted in the High
State, but increasingly prominent. In the Low State, the line profile is very strong and centered af approx. 6.7 keV; disk line emission
models constrain the inner edge of the disk to fluctuate between approx.20 and approx.59 R(sub g). We trace the disk reflection
fraction across the full outburst of this source, and find well-constrained fractions below those observed in AGN in the Very
High and High States, but consistent with other galactic sources in the Low State. We discuss the possible implications for black
hole X-ray binary system dynamics and accretion flow geometry.
Author
X Ray Binaries; X Ray Spectra; Skewness; Spectrum Analysis; Black Holes (Astronomy); Iron; Quasars
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ASTROPHYSICS
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20000062020 National Optical Astronomy Observatories, Tucson, AZ USA
Kapteyn and the Selected Areas: A Personal Perspective, Chapter 10
Kinman, T. D., Kitt Peak National Observatory, USA; June 2000; 18p; In English
Report No.(s): NOAO-Preprint-880-CH-10; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche