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  • 1
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    The Next Generation Space Telescope (NGST): Science and technology (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The scientific requirements and implications for the instruments and telescope design for the Next Generation Space Telescope (NGST) are described. A candidate concept is a deployable, 8 m diameter telescope, optimized for the near infrared region, but featuring instruments capable of observing up to 30 micrometers. The observatory is radiatively cooled to approximately 30 K.
    Keywords: Astronomy
    Type: ; 213-218
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Simulations of the STIS CCD clear imaging mode PSF (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Detailed understanding of the properties of the point-spread function (PSF) of Space Telescope Imaging Spectrograph (STIS) imaging modes is necessary to separate real effects of geometrically complex astronomical sources, such as protoplanetary disks surrounding bright stars, from instrumental effects, such as scattering and diffraction. In order to investigate STIS imaging properties we have numerically simulated broadband stellar PSFs generated by STIS in CCD clear imaging mode, including the effects of the Lyot stop and the coronagraphic wedges. The input spectrum is a stellar model atmosphere of the appropriate spectral type, convolved with the pre-flight STIS CCD response function. The PSF modeler generates broadband PSFs by co-adding weighted monochromatic PSFs across the waveband.
    Keywords: Astronomy
    Type: The 1997 HST Calibration Workshop with a New Generation of Instruments; 84-89; NASA/TM-97-208141
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    NASA TECHNICAL REPORTS
  • 3
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    Correction for the STIS echelle blaze function (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Using the Early Release Observation of 9 Comae, we demonstrate an iterative method for correcting Space Telescope Imaging Spectrograph (STIS) echelle spectra for the effects of the echelle ripple. This analytic approach allows the actual spectrum of interest to be used in the determination of its calibration. The late F star 9 Comae is not an ideal candidate for this method, due to the many absorption lines present in its E230M spectrum, yet, given this difficulty, the method still works quite well.
    Keywords: Astronomy
    Type: The 1997 HST Calibration Workshop with a New Generation of Instruments; 114-119; NASA/TM-97-208141
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  • 4
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    The STIS parallel survey: Introduction and first results (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The installation of the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST) allows for the first time two-dimensional optical and ultraviolet slitless spectroscopy of faint objects from space. The STIS Parallel Survey (SPS) routinely obtains broad band images and slitless spectra of random fields in parallel with HST observations using other instruments. The SPS is designed to study a wide variety of astrophysical phenomena, including the rate of star formation in galaxies at intermediate to high redshift through the detection of emission-line galaxies. We present the first results of the SPS, which demonstrate the capability of STIS slitless spectroscopy to detect and identify high-redshift galaxies.
    Keywords: Astronomy
    Type: The 1997 HST Calibration Workshop with a New Generation of Instruments; 94-99; NASA/TM-97-208141
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  • 5
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    An investigation into the milliarcsecond attitude control errors of Hubble Space Telescope (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: An analysis of the fine pointing errors of the Hubble Space Telescope (HST), in the range from 1 to 15 milliarcsecs, is reported on. The emphasis is on the study of the performance characteristics of the pointing control system, fine guidance sensors and the optical telescope assembly, which produce relative attitude and astrometric measurement errors. Since the first servicing mission in December 1993, the HST relative short term position stability is of the order of 3 milliarcsecs RMS when averaged over 1 min intervals. At this level of accuracy, longer term systematic attitude errors in this range can have a noticeable impact on the telescope's observations. The various error sources are described, including: internal temperature effects; spacecraft structure temperature effects; calibration procedures, and computational inaccuracies.
    Keywords: Astronomy
    Type: ; 233-238
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  • 6
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    Global astrometry with the space interferometry mission (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The prospects for global astrometric measurements with the space interferometry mission (SIM) are discussed. The SIM mission will perform four microarcsec astrometric measurements on objects as faint as 20 mag using the optical interferometry technique with a 10 m baseline. The SIM satellite will perform narrow angle astrometry and global astrometry by means of an astrometric grid. The sensitivities of the SIM global astrometric performance and the grid accuracy versus instrumental parameters and sky coverage schemes are reported on. The problems in finding suitable astrometric grid objects to support microarcsec astrometry, and related ground-based observation programs are discussed.
    Keywords: Astronomy
    Type: ; 789-793
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  • 7
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    The scientific basis for the space interferometry mission (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The space interferometry mission (SIM), for launch in 2004, is expected to determine the positions of point sources to a global accuracy of 4 microarcsec, and an accuracy of 1 microarcsec over small angles. The instrument will reach 200 mag in 3 x 10(exp 4) s and has a nominal lifetime of five years. A nulling capability will be provided and synthesis imaging and near-infrared capabilities are being considered. These capabilities will extend those of the Hipparcos mission by almost three orders of magnitude in every sense. The NASA's expectation for the scientific return from the SIM mission is outlined in terms of the areas of stellar physics, galactic structure and extragalactic astrophysics, including the distance scale problem.
    Keywords: Astronomy
    Type: ; 749-753
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  • 8
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    High energy survey of supernova remnants with BATSE (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The burst and transient source experiment (BATSE) survey of the high energy emission from supernova remnants is reported on. The ability of BATSE to continuously monitor the entire sky in the 20 keV to 2 MeV energy range enables a large group of remnants to by studied at high energies. Preliminary analysis indicates the likely detection of several supernova remnants other than the Crab nebula. Among these are MSH 15-52, Vela, Cas A and possibly HB 9. The techniques employed are discussed together with the status of the survey and its limitations.
    Keywords: Astronomy
    Type: ; 547-550
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  • 9
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    High-resolution spectral measurements of GRO J1655-40 (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Data from the transient gamma ray germanium detector taken during 1995 provide a limited ability to study the high resolution spectrum of the X-ray transient GRO J1655-40. During a two-day period around the peak intensity, the soft spectrum was measured and found to be consistent with a power law spectrum with photon index -3.0 +/- 0.2. No evidence was found for narrow spectral features in the 50 to 100 keV band or around 511 keV. The 3 sigma upper limit for a narrow emission line at 511 keV is 1.2 x 10(exp -2) phot/cu cm s.
    Keywords: Astronomy
    Type: Proceedings of 2nd INTEGRAL Workshop 'The Transparent Universe'; 229-232; ESA-SP-382
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  • 10
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    STIS target acquisition (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: We describe the STIS autonomous target acquisition capabilities. We also present the results of dedicated tests executed as part of Cycle 7 calibration, following post-launch improvements to the Space Telescope Imaging Spectrograph (STIS) flight software. The residual pointing error from the acquisitions are 〈 0.5 CCD pixels, which is better than preflight estimates. Execution of peakups show clear improvement of target centering for slits of width 0.1 sec or smaller. These results may be used by Guest Observers in planning target acquisitions for their STIS programs.
    Keywords: Astronomy
    Type: The 1997 HST Calibration Workshop with a New Generation of Instruments; 39-46; NASA/TM-97-208141
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