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  • Other Sources  (16)
  • 1990-1994  (6)
  • 1985-1989  (7)
  • 1960-1964  (2)
  • 1930-1934
  • 1925-1929  (1)
  • 11
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    Spectroscopy of the extranuclear line-emitting regions associated with the gravitational lens system 2016 + 112 (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Moderate-resolution slit spectroscopy of the extended emission-line objects A1 and B1 located within 5 arcsec of the triple radio source 2016 + 112 shows that at least one is physically associated with the z = 3.273 quasar thought to be multiply imaged by a foreground galaxy. The data and theoretical models unanimously favor the identification of A1 and B1 with two separate clouds of ionized gas that lie within a few kiloparsecs of the primary A/B QSO and radio source. The available evidence does not support the view that they are multiple images of a single object or their classification as separate (companion) galaxies.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 94; 12-15
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Optical observations of SN 1987D in UGC 7370 (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper presents optical photometry and spectroscopy of SN 1987D, a Type Ia supernova in the nearby galaxy UGC 7370, during the period immediately subsequent to its discovery. The distance modulus of the galaxy, independently determined by the redshift and the Tully-Fisher (1977) relation, is 32.3 + or - 1.0. The maximum brightness of SN 1987D was V about 13.2 and occurred on April 18, 1987, + or - 4 days; the absolute luminosity is about 0.6 mag brighter than the average for SNe Ia. The spectrum of SN 1987D is typical of SNe Ia, but the expansion velocity (9600 km/s) is considerably lower than average.
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 99; 1167-117
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    NASA TECHNICAL REPORTS
  • 13
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    Spectroscopic CCD surveys for quasars at large redshift. I - A deep PFUEI survey (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A survey for faint quasars has been conducted using slitless spectroscopy with the PFUEI at the 200 inch (5 m) telescope. The survey covers a total of 0.91 sq deg in 113 fields at galactic latitudes above 30 deg. Calibrated spectra in the range 4500-7200 A were obtained for more than 9000 objects. Emission-line candidates were selected on the basis of two criteria: the equivalent width must exceed 50 A, and the signal-to-noise ratio of the detection of the line versus the sky background should be larger than 7. Among 45 candidates so selected, subsequent slit spectroscopy confirmed 27 emission-line objects. Among these, 17 are emission-line galaxies with redshifts in the range 0.04-0.31, and 10 are quasars with redshifts between 0.91 and 2.66. The well-defined selection criteria for these objects, together with the distribution of rest frame equivalent widths of the emission lines, allow derivation of the area of sky covered as a function of the continuum limiting magnitude. The observed number of quasars in the redshift range 0.7-2.7 agrees well with that predicted by the luminosity function models published by Schmidt and Green in 1983. It is concluded that quasars with an absolute magnitude of M(B) = -25 suffer a redshift cutoff near or below a redshift of 3.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 306; 411-427
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    NASA TECHNICAL REPORTS
  • 14
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    X-ray observations of the bright quasar survey (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Using the Einstein Observatory, X-ray observations of about 80 percent of the quasars in the Bright Quasar Survey located outside the declination range defined by 30 and 60 deg. X-ray emission has been detected above the 3-sigma level for 57 out of 66 quasars observed. This paper describes observations and data reduction and provides a summary of the more detailed analyses and discussion contained in the two accompanying papers (Schmidt and Green 1986, Avni and Tananbaum 1986).
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 305; 57-67
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  • 15
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    Formation of glycolipids by n-alkanes utilizing marine bacteria (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-08
    Description: During a screening for biosurfactants among marine microorganisms it was possible to isolate two marine bacteria producing glycolipids. One strain was identified as Arthrobacter sp. EK l which produced trehalose lipids, mainly a 2,3,4,2'­-trehalose tetraester. From the other pure culture identified as Alcaligenes sp. MM l a new glucose lipid was isolated.
    Type: Article , NonPeerReviewed
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    PAPER (OCEANREP)
  • 16
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    Screening for biosurfactants among crude oil degrading marine microorganisms (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-09
    Description: Cellbound and extracellular biosurfactants were detected by thin-layer chromatography, tensiometric measurements, blood agar lysis and their capability of stabilizing oil in water emulsions. Known trehalose lipids (RAPP et al. 1979, RISTAU et al. 1983) and one glucose lipid, formerly unknown, with excellent properties were isolated. Also emulsifying agents were found. They seemed to be high molecular weight substances. Mixtures of hydrocarbons containing aliphatics and aromatics were efficiently emulsified. Reduced activity after digestion by several proteases gives a first indication of the nature of the emulsifiers. Preliminary results with several marine microorganisms showed that most biogenic surfactants possess a good environmental compatibility (v. BERNEM 1984, LANG et al. 1986).
    Type: Article , NonPeerReviewed
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