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  • 1
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    The relation between FIR and H I emission in galaxies (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This project explored the relationship between the global far-infrared and neutral hydrogen (H I) emission from galaxies, based on data from the Infrared Astronomy Satellite (IRAS) and published radio data. 100 and 60 micron IRAS fluxes were used to establish a temperature corrected measure of the cold dust emission, and H I fluxes were drawn from the literature with the greatest possible consistency. The degree of correlation between the FIR and H I fluxes was found to be better than in previous studies, comparable to the correlation previously found between FIR and CO fluxes. The improvement was obtained largely by (1) separating 'stripped' from 'unstripped' galaxies, and (2) using compatible sources of H I data. Stripping occurs in clusters of galaxies and is probably caused by ram-pressure effects as a galaxy travels through the intergalactic medium. Our results suggest that stripped galaxies have had their outer-disk gas removed (approximately 80% of their total H I) while retaining most of their 100-micron-emitting dust. This strongly shifts the ratio of their 100-micron-to-H I fluxes. The second problem, arising from diverse sources of data, arises because differing telescopes and observational techniques give rise to substantial disagreement in the measured H I flux, and this degrades the correlation of the FIR and H I fluxes.
    Keywords: ASTRONOMY
    Type: NASA-CR-199454 , NAS 1.26:199454 , JPL-9950-1419 , NIPS-95-05029
    Format: application/pdf
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  • 2
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    Lessons learned in the development of the Hubble Space Telescope software (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The lessons learned in the development of the Hubble Space Telescope software are described. Those aspects of the development that were successful are discussed. Areas which in retrospective analysis could have been more efficient are identified. It is concluded that few hardware oriented project managers understand or are comfortable with software technology. Most managers overestimate the size and magnitude of the complex tasks assigned.
    Keywords: ASTRONOMY
    Type: CNES, The Management of Large Software Projects in the Space Industry; p 335-343
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  • 3
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    Luminosity function of quasars at large redshifts from grism surveys (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: We have carried out a systematic search for emission-line objects through photometrically calibrated CCD grism surveys with the Palomar 200-inch telescope in transit mode, covering 62 square degrees. These surveys have yielded 141 quasars detected by their C IV or Ly-alpha emission in the redshift range 2.0 - 4.7. We use this sample and the known flux limits to derive the slope of the luminosity function and the space density above a given line luminosity, as a function of redshift. While space densities are approximately constant at redshifts 2.0 - 3.0, they are declining steeply for redshifts larger than 3.
    Keywords: ASTROPHYSICS
    Type: In: The space distribution of quasars; Proceedings of the Workshop, Victoria, Canada, June 3-5, 1991 (A93-28776 10-90); p. 109-114; Discussi
    Format: text
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  • 4
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    A Cassegrain echelle spectrograph (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The 'LPL echelle' is a CCD spectrograph with a resolving power of 160,000 and enough sensitivity to detect the brighter airglow emissions in a few minutes. It uses an R3.2 grating in a novel out-of-plane mounting that permits any wavelength to be placed on the blaze. A single order is selected by a medium-band interference filter. Lower dispersions and broader wavelength coverage are obtained by replacing the echelle by a 600 line/mm grating or a Littrow prism.
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 103; 1187-119
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  • 5
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    Spectroscopy of an unusual emission line M star (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Moderate-resolution spectroscopy of an unusual late-type faint emission-line star, PC 0025 + 0047, is reported. A very strong (greater than 250 A equivalent width) an H-alpha emission line was detected by the present automated line search algorithm. The spectrum was found to have two unresolved emission lines (H-alpha and H-beta) near zero velocity, superposed on the absorption spectrum of a very red M dwarf which has strong K I, and relatively weak bands of TiO. From the weakness of the subordinate lines of Na I (8192 A) and other spectral features, it is inferred that it is definitely a cooler, and probably fainter, analog of LHS 2924. The strength of the emission lines indicates that PC 0025 + 0447 is very young and may be a fading predecessor brown drawf at an estimated M(bol) approaching 14m at a distance of about 60 pc.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 102; 1180-119
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  • 6
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    PC 1247 + 3406 - An optically selected quasar with a redshift of 4.897 (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Observations of PC 1247 + 3406, a quasar with a redshift of 4.897 + or - 0.011, is described on the basis of a four-filter CCD survey designed to detect quasars with redshifts between 4.0 and 5.5. The quasar was found to be about the same brightness as PC 1158 + 4635, a quasar with a 20th-magnitude redshift of 4.733 discovered in 1989. The properties of PC 1247 + 3406 are similar to other quasars with redshifts above 3, although the absorption due to intervening neutral hydrogen is about 20 percent less than expected. The flux in the spectrum abruptly drops at a wavelength of about 910 A in the quasar's rest frame. This quick encounter with a Lyman-limit system is frequently seen in other quasars with redshifts above 4.3.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 102; 837-840
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  • 7
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    Moderate resolution spectrophotometry of high redshift quasars (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A uniform set of photometry and high signal-to-noise moderate resolution spectroscopy of 33 quasars with redshifts larger than 3.1 is presented. The sample consists of 17 newly discovered quasars (two with redshifts in excess of 4.4) and 16 sources drawn from the literature. The objects in this sample have r magnitudes between 17.4 and 21.4; their luminosities range from -28.8 to -24.9. Three of the 33 objects are broad absorption line quasars. A number of possible high redshift damped Ly-alpha systems were found.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 101; 2004-201
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  • 8
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    Northern dwarf and low surface brightness galaxies. IV - The large-scale space distribution (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Results are reported from a statistical analysis of published observational data on a sample of 860 northern dwarf and low-surface-brightness (D/LSB) galaxies with delta = 0 deg or greater and b between -40 and 40 deg, selected from the Uppsala General Catalogue of Galaxies (Nilson et al., 1973). The results are presented in extensive redshift/space maps, histograms, graphs and tables and characterized in detail. It is shown that the distribution of D/LSB galaxies closely resembles that of bright galaxies, apparently ruling out biased-star-formation models predicting a uniform distribution of D/LSBs. Although bright galaxies outside clusters are somewhat more clustered than the H I-rich D/LSBs, the latters' pairwise peculiar velocity (460 + or - 50 km/sec) is similar to that of the former.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 370; 25-48
    Format: text
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