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  • ASTROPHYSICS  (4)
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  • 1
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    Unknown
    Brightness, density, and color profiles of three globular clusters - NGC 6440, 6541, and 7099 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Using short-exposure SEC television camera observations, the radial distribution profiles of surface brightness, B-V colors and star densities are determined in three globular clusters, NGC 6440, 6541 and 7099, from about 2-200 arc sec from the cluster centers. Good agreement is found between the surface-brightness profiles and the star-density distributions; both can be fitted well with a King-type curve, and no significant evidence for a presence of cusp at r greater then 3 arc sec is observed. Also determined for the three clusters were central surface brightnesses, core radii, central mass densities, total cluster masses, relaxation times and central escape velocities. In addition, an upper limit of 5000 solar masses is placed on the mass of a possible central black hole in these clusters.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 232
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A photometric determination of twists in early-type galaxies. II (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: In continuation of previous work, detailed photometric data have been obtained for two elliptical galaxies by using the Mount Lemmon 1.5-m telescope and a large SEC television camera. As before, the aim of this photometry is to gain additional information on the occurrence of twists in such galaxies; i.e., on the change of the position angle of the major axes of the isophotes from the center outward. No significant twist was found in NGC 1052. However, NGC 584 was found to have a securely observed twist of about 10 deg within 10 kpc from its center. These data strengthen previous indications that many ellipticals contain twists in their inner, bright portions.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal Supplement Series; 41; Oct. 197
    Format: text
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  • 3
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    The spectrum of the halo surrounding the quasar PHL 1070 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The quasar PHL 1070 and its surrounding halo of light have been observed with the Palomar multichannel spectrophotometer using circular and annular apertures. The central quasar has a magnitude of 16.6 and an emission-line redshift of 0.076 + or - 0.002. The halo light has a magnitude of 19.0 and a possible absorption-line system with an absorption redshift of 0.067 + or - 0.008. The magnitude, possible absorption lines, and probable spectral energy distribution of the halo are consistent with those of a normal galaxy at the redshift of the quasar.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 219
    Format: text
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  • 4
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    H-alpha Fabry-Perot interferometric observations of blue compact dwarf galaxies (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: H-alpha Fabry-Perot interferometric observations of the two blue compact dwarf galaxies (BCDs) 7 Zw 403 and 1 Zw 49 are presented. The velocity field of 7 Zw 403 shows no clear large-scale organized motion but the velocity field is not completely chaotic either. The gas associated with the 8 H II regions in 7 Zw 403 has neither the highest nor lowest velocities. The BCD 1 Zw 49 is dominated by a single H II region which is about 50 times brighter than any other feature in the galaxy. There is a chain of fainter H II regions extending across the galaxy. The velocity field is well ordered along the H II region chain, but it is very complex around the dominant H II region, suggesting H-alpha loops and filaments around the latter. Both BCDs show velocity gradients of about 25 km/s on scales of about 10 pc in 7 Zw 403 and of about 50 pc in 1 Zw 49. These velocity discontinuities compress the gas and are probably responsible for the star formation.
    Keywords: ASTROPHYSICS
    Type: Moriond Astrophysics Meeting; Mar 08, 1987 - Mar 15, 1987; Les Arcs; France
    Format: text
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