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  • Other Sources  (7)
  • 1985-1989  (7)
  • 1970-1974
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  • 1
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    A test of the massive binary black hole hypothesis - Arp 102B (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The emission-line spectra of several AGN have broad peaks which are significantly displaced in velocity with respect to the host galaxy. An interpretation of this effect in terms of orbital motion of a binary black hole predicts periods of a few centuries. It is pointed out here that recent measurements of the masses and sizes of many low-luminosity AGN imply orbital periods much shorter than this. In particular, it is found that the elliptical galaxy Arp 102B is the most likely candidate for observation of radial velocity variations; its period is expected to be about 3 yr. The H-alpha line profile of Arp 102B has been measured for 5 yr without detecting any change in velocity, and it is thus found that a rather restrictive observational test of the massive binary black hole hypothesis already exists, albeit for this one object.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 331; 46-48
    Format: text
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  • 2
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    Spatially resolved ultraviolet spectroscopy of the liner NGC 3998 (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Results of IUE observations of the Liner NGC 3998 are reported. Spatial structure in the long wavelength emission is apparent; the spatial profiles from the LWP line-by-line images show a two-component structure, with an unresolved central component superimposed on extended underlying emission. The LWP emission was separated into component spectra. The unresolved component spectrum is considerably flatter than the extended component spectrum, which is dominated by fairly late type stars (late F to early G). The unresolved component also shows strong C II) 2326 A and broad Mg II 2800 A emission.The width of the Mg II emission is 8600 km/sec, and its profile agrees quite well with the broad wings of the H alpha emission. The results support the idea that NGC 3998 may contain a dwarf Seyfert nucleus.
    Keywords: ASTRONOMY
    Type: ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2; p 307-310
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  • 3
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    Kinematic evidence for a relativistic Keplerian disk - Arp 102B (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Line profiles were calculated for a Keplerian disk with allowance made for relativistic effects. Excellent agreement was found between the resulting double peaked asymmetric profiles and the H-alpha line of Arp 102B; this yielded an accurate determination of several disk parameters. It is believed that the line profile of Arp 102B shows the most convincing direct kinematic evidence for rotation in any AGN.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 339; 742-751
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  • 4
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    SN 1961V - An extragalactic ETA Carinae analog (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Spectra of the site of the unique type V supernova SN 1961V in NGC 1058 and of two nearby H II regions have been obtained. Broad H-alpha emission with a luminosity of 2 x 10 to the 36th ergs/s is detected at the position, so that SN 1961V becomes the first historical extragalactic object classified as a supernova to be optically recovered. The characteristics and origin of the high-excitation H II regions of the site are discussed. It is argued that SN 1961V was not a supernova, but an exaggerated Eta Carinae-type outburst of a very massive, evolved star near the end of core hydrogen burning.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 342; 908-916
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  • 5
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    The optical light curve of SN 1985f in NGC 4618 (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The 4930-A optical light curve obtained for the bizarre 1985f supernova in NGC 4618 covers a six-month interval; care has been taken to eliminate contamination by bright underlying H II regions. The light curve is well approximated by a constant decline of 0.0153 mag/day. The spectroscopic work of Gaskell et al. (1986) suggests that this supernova is a Type Ib object; if so, the present observations represent the first light curve of an object of this type at late times in its evolution, furnishing a standard against which future sightings can be compared.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 92; 1341-134
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  • 6
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    NGC 6212 - An X-ray-selected active elliptical galaxy (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Optical and X-ray data on the elliptical galaxy NGC 6212 are reported. The X-ray flux varies by a factor of four on a time scale of months. The optical spectrum shows broad Balmer emission lines and narrow forbidden lines which are typical of low-luminosity X-ray selected Seyfert galaxies. The continuum is predominantly stellar, with no evidence for a nonthermal contribution. Narrow emission lines extend at least 11 kpc from the nucleus and are used to derive a rotation curve. The X-ray variability and relatively weak radio emission of NGC 6212 are not unusual for Seyfert galaxies.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 91; 1019-102
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  • 7
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    Strong Lyman-alpha emission in three distant radio galaxies (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Very strong, narrow Lyman alpha emission (equivalent width approximately 1000 angstroms) has been discovered in the redshifted ultraviolet spectra of three radio galaxies having z between 1.62 and 1.82. The three are 3C 256, 3C 239, and 3C 241. It is noted that Lyman alpha will probably be a very useful redshift and classification determinant in future spectroscopic surveys of active galaxies at still greater distances.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 299; L7-L11
    Format: text
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