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  • 1
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    Ultraviolet observations of the Cygnus Loop (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The analysis of IUE observations of a filament on the western edge of the Cygnus Loop yields a shock velocity of about 130 km/sec, significantly higher than the velocity estimated from the optical spectrum. This velocity together with the high forbidden O III/H-beta ratio reported by Miller (1974) indicates that much of the hydrogen recombination region predicted by steady flow shock models is absent. This situation may occur because this part of the supernova remnant is in the shell-formation phase that accompanies the transition from the adiabatic to the snowplow phase or because the observed filament is a recently shocked cloud.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 238
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  • 2
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    Detection of X-ray polarization of the Crab Nebula. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Two different types of X-ray polarimeters were used in a sounding rocket to search for X-ray polarization of the Crab Nebula. Polarization was detected at a statistical confidence level of 99.7%. If the X-ray polarization is assumed to be independent of energy, the results of this and a previous experiment lead to a polarization of 15.4 (plus or minus 5.2) percent at a position angle of 156 (plus or minus 10) deg. This result confirms the synchrotron model for X-ray emission from the Crab Nebula.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 174; May 15
    Format: text
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  • 3
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    Search for continuous X-ray emission from NP 0532 (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A search for continuous X-ray emission from the pulsar NP 0532 has been performed using lunar occultations and high temporal resolution. No increase in the nonpulsed phase of the flux from the Crab Nebula was observed when NP 0532 was exposed. The result is used to establish an upper limit of 4.7 million K (99% confidence) on the surface temperature of the neutron star.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 202; Dec. 1
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  • 4
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    Stellar crystal X-ray spectroscopy on OSO-8 (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The large-area graphite crystal X-ray spectrometer on the OSO-8 satellite is described, and its response to stellar line and continuum radiation is discussed. A high resolution X-ray spectrum of Sco X-1 obtained from a preliminary analysis of quick look data shows a strong, smooth continuum with an absence of emission or absorption features over the energy range 2.2 to 8 keV. Upper limits are set on narrow line emission from highly ionized states of S, Ca, and Fe.
    Keywords: ASTROPHYSICS
    Type: CONTRIB-116 , NASA. Goddard Space Flight Center X-ray Binaries; p 53-65
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  • 5
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    The energy spectrum of the Perseus cluster of galaxies (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A one-dimensional focusing X-ray telescope has been used to measure the spatial structure and energy spectrum of the Perseus cluster in the 0.5-4.5 keV X-ray range. A significant variation is observed in the X-ray spectrum from different regions of the cluster, indicating different possible emission mechanisms. The spectrum from the region centered on NGC 1275 appears harder and more cut off at low energy than that of the remainder of the cluster.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 197; May 1
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  • 6
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    An upper limit to an X-ray point source at the center of the Cygnus Loop (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Cygnus Loop was observed with a one-dimensional X-ray telescope. Data from two orthogonal scans showed no evidence for a pointlike remnant of the supernova at the center of the Loop. We set an upper limit to the presence of such a source of 2.9% (at 99.9% confidence) of the total emission in the bandwidth from 400 eV to 850 eV. The pulsed component at 62.31 msec suggested by Rappaport et al. (1973) was not observed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 194; Dec. 1
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  • 7
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    X-ray morphology of the Perseus cluster (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A measurement of the spatial distribution of the X-ray flux from the Perseus cluster of galaxies is reported. The measurement was made with a one-dimensional X-ray telescope carried by an Aerobee sounding rocket on February 8, 1974. The results are compared with previous X-ray observations and optical measurements of the galaxy distribution. The data show the presence of a luminous feature centered on NGC 1275, considerable emission from extended regions, and a marked asymmetry between the E-W and N-S distributions in the X-ray flux.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 193; Oct. 15
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  • 8
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    Search for X-ray polarization in Cygnus X-1 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Cygnus X-1 was observed at 2.6 and 5.2 keV during a three-day period in November 1975 by the X-ray polarimeters on the OSO-8 satellite. At the 99% confidence level, the results are consistent with the source being unpolarized. Positive evidence for polarization at 2.6 keV was obtained at the 96% confidence level.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 215
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  • 9
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    Measurement of the X-ray polarization of the Crab Nebula (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The graphite crystal X-ray polarimeters aboard the OSO-8 satellite were used to observe the Crab Nebula for six days from March 11 through March 17, 1976 (UT). Analysis of 15 orbits of quick-look data shows that the polarization and position angles at 2.6 and 5.2 keV are 15.7%(+ or - 1.5%) at 161.1(+ or - 2.8) deg and 18.3%(+ or - 4.2%) at 155.5(+ or - 6.6) deg, respectively. These results confirm the previous measurement and the hypothesis of synchrotron X-ray emission.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 208; Sept. 15
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  • 10
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    Search for X-ray line emission from A0620-00 (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurements of the X-ray spectrum (1.85-7 keV) of A0620-00 obtained on 1975 October 17 and 1976 January 1-9 with the graphite crystal spectrometer on OSO-8 show a smooth continuum with an absence of emission lines. Upper limits are given for line emission from Si and S ions and are used to establish that the source is not optically thin. The results support a dense plasma model.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 208; Aug. 15
    Format: text
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