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  • Other Sources  (5)
  • ASTROPHYSICS  (5)
  • *Tropical Climate
  • carbamazepine
  • 1
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    The soft X-ray spectrum of the Vela supernova remnant (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An X-ray spectrum of a major fraction of the Vela supernova remnant has been obtained during scanning observations with the low energy proportional counters of the A-2 experiment, flown on HEAO 1. A deconvolution analysis of the data shows that the spectrum exhibits pronounced line emission near 0.6 keV due primarily to oxygen ions. Model fits using the Raymond-Smith hot plasma emission calculations indicate that the spectrum can be well described by a model involving two collisional equilibrium components with temperatures of 2.4 x 10 to the 6th and 1.9 x 10 to the 7th K, respectively. The abundances of oxygen and iron are found to be constrained to lie near their normal cosmic values.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 269; June 1
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  • 2
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    Optical observations of the BL Lacertae object PKS 2155-304 and implications regarding the X-ray absorption feature at 600-700 eV (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The interpretation of the PKS 2155-304 identification as a BL Lac object whose X-ray spectrum contains an absorption trough has been hampered by the lack of a reliable redshift for the source. Spectra derived from extensive optical observations of this source imply a redshift of 0.117 + or - 0.002. With knowledge of the redshift, the range of mechanisms which can produce the X-ray trough can be reduced. Attention is given to these alternative mechanisms.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L103-L10
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  • 3
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    Narrowband imaging and spectroscopy close to the nucleus of the Seyfert galaxy NGC 7682 (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Keel's (1985) report of a jet-like optical feature emanating from the nucleus of NGC 7682 is investigated. Deep CCD images of NGC 7682 were taken with narrowband filters centered on the redshifted wavelength of H-alpha + forbidden N II and on a nearby continuum region. The continuum-subtracted line images show no evidence of the jet feature, although numerous H II regions appear clearly, both close to the nucleus and in the extended spiral arm structure. Spectra were taken at various dispersions and position angles, including the supposed position angle of the jet. These data were used to obtain background-subtracted spectra at the precise location of the jet. No excess emission was detected above the background-galaxy contribution. The highest-resolution spectra were used to determine the redshift of the galaxy to high precision.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 93; 1054-105
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  • 4
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    Simultaneous multifrequency observations of Markarian 421 (1987)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Simultaneous radio, optical, ultraviolet, and X-ray observations of the highly variable BL Lacertae object Mrk 421 conducted over a period of four days in December 1984 and again in January 1985 are reported. During this time, the 2-10 keV flux dropped by a factor of eight, whereas the 0.1-1 keV flux decreased by a factor of only two. These changes were not reproduced at longer wavelengths during the period of simultaneous observation. The implications of these results for beaming models, the relation between BL Lacertae objects and other classes of AGN, and the nature of the core regions of active galaxies are discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 318; 175-187
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  • 5
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    A redshift survey toward a proposed void of galaxies suggested by the distribution of Abell clusters (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A program of redshift measurements was carried out in a region of the sky in which a relative under-density of Abell clusters had been used to infer the presence of a large (diameter about 40/h Mpc) void in the general galaxy distribution. The purpose of this study was to investigate whether the large-scale distribution of galaxies is traced by the distribution of rich clusters. Redshifts are presented for 308 galaxies in the Zwicky Catalog in a 234 square degree region centered on R.A. about 2h, Decl. about 12 deg of which 229 have been newly measured. These data reveal a pattern of filamentary structure alternating with voids of characteristic diameter about 25-30/h Mpc, throughout the volume sampled. While the redshift data reveal an underdensity in the distribution of galaxies in the general region suggested by the Abell cluster distribution, they do not support the existence there of a 40/h Mpc diameter void.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 355; 393-400
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