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  • 1990-1994  (15)
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  • 11
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    The Einstein Observatory catalog of IPC x ray sources. Volume 7E: Right ascension range 20h 00m to 23h 59m (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Einstein Observatory (HEAO-2, launched November 13, 1978) achieved radically improved sensitivity over previous x-ray missions through the use of focusing optics which simultaneously afforded greatly reduced background and produced true images. During its 2.5-yr mission, the Einstein X-Ray Telescope was pointed toward some 5,000 celestial targets, most of which were detected, and discovered several thousand additional 'serendipitous' sources in the observed fields. This catalog contains contour diagrams and source data, obtained with the imaging proportional counter in the 0.16 to 3.5 keV energy band, and describes methods for recovering upper limits for any sky position within the observed images. The main catalog consists of six volumes (numbered 2 through 7) of right ascension ordered pages, each containing data for one observation. Along with the primary documentation describing how the catalog was constructed, volume 1 contains a complete source list, results for merged fields, a reference system to published papers, and data useful for calculating upper limits and fluxes.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-108401-VOL-7E , NAS 1.15:108401-VOL-7E
    Format: application/pdf
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  • 12
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    The Einstein Observatory catalog of IPC x ray sources. Volume 5E: Right ascension range 12h 00m to 15h 59m (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Einstein Observatory (HEAO-2, launched November 13, 1978) achieved radically improved sensitivity over previous x-ray missions through the use of focusing optics, which simultaneously afforded greatly reduced background and produced true images. During its 2.5-yr mission, the Einstein X-Ray Telescope was pointed toward some 5,000 celestial targets, most of which were detected, and discovered several thousand additional 'serendipitous' sources in the observed fields. This catalog contains contour diagrams and source data, obtained with the imaging proportional counter in the 0.16 to 3.5 keV energy band, and describes methods for recovering upper limits for any sky position within the observed images. The main catalog consists of six volumes (numbered 2 through 7) of right ascension ordered pages, each containing data for one observation. Along with the primary documentation describing how the catalog was constructed, volume 1 contains a complete source list, results for merged fields, a reference system to published papers, and data useful for calculating upper limits and fluxes.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-108401-VOL-5E , NAS 1.15:108401-VOL-5E
    Format: application/pdf
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  • 13
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    Multiwavelength observations of Hercules X-1/HZ Herculis (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: We present first results from a multiwavelength campaign to observe the binary pulsar system Her X-1/ HZ Her. The campaign spanned 4 days during 1993 August: observations were taken with five satellites (IUE, EUVE, ROSAT, ASCA, and CGRO/BATSE) and several ground-based facilities. A substantial, unexpected drop in flux at X-ray energies, with no change in absorbing column density, was observed. The pulse period has increased from the previous measurement, contrary to the usual spin-up, and no pulsed emission is detected above 0.9 keV in the low state. The optical and UV fluxes continued to show 1.7 day modulation attributed to X-ray heating of the companion star. However, the significant reduction in UV flux observed around eclipse implies an absence of the normally observed excess attributed to X-ray heating of the disk. We conclude that we have observed an anomalous low state, seen only once before (Parmar et al. 1985), in which the X-ray flux is not redistributed but obscured. We suggest explanations for the behavior of the flux at different wavelengths.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 436; 1; p. L9-L13
    Format: text
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  • 14
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    High-resolution X-ray observations of the central region of M31 with the Rosat satellite (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A 48,000-sec observation of M31's central 34 arcmin, using the Rosat HRI, has led to the detection of 86 X-ray sources with luminosities above 1.4 x 10 exp 36 ergs/sec; of these, 18 sources are identified with globular clusters and two with SNRs. An extrapolation of the cumulative luminosity distribution to fainter luminosities indicates that only about 15-26 percent of the diffuse X-ray emission in the bulge is attributable to faint unresolved sources from this distribution. The spatial distribution and number density of X-ray sources in M31 appear to be very different from those of our Galaxy.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 410; 2; p. 615-625.
    Format: text
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  • 15
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    The CfA Einstein Observatory extended deep X-ray survey (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: All IPC exposures in the Einstein Extended Deep X-ray Survey program have been reanalyzed. The current survey covers about 2.3 sq deg with a typical limiting sensitivity of about 5 x 10 to the -14th ergs/sq cm/s in the energy range from 0.8-3.5 keV. A total of 25 IPC sources are detected above a threshold of 4.5 sigma. A total of 18 are detected independently in the HRI, leading to the identification of six with stars and 11 with extragalactic objects. The remaining sources are classified as extragalactic. The population of identified extragalactic objects is dominated by QSOs, with one or two possible clusters. The basic conclusions of the original survey remain unchanged.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 374; 440-455
    Format: text
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