학술논문

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'학술논문' 에서 검색결과 10건 | 목록 1~10
Periodical
Publications of the Astronomical Society of the Pacific; February 1986, Vol. 98 Issue: 600 p134-139, 6p
Academic Journal
Nature; 1/5/1978, Vol. 271 Issue 5640, p35-37, 3p
Periodical
Publications of the Astronomical Society of the Pacific; December 1979, Vol. 91 Issue: 544 p746-748, 3p
Academic Journal
Peterson, B. M., T. J. Balonek, E. S. Barker, J. Bechtold, R. Bertram, N. G. Bochkarev, M. J. Bolte, et al. 1991. “Steps Toward Determination of the Size and Structure of the Broad-Line Region in A large, international program of ground-based optical spectroscopy and photometry of the variable Seyfert 1 galaxy NGC 5548 undertaken in support of an IUE monitoring campaign is described. This contribution presents the data base and describes the methods used to correct for systematic differences between spectra from different sources. Optical continuum and H-beta emission-line light curves are derived from the spectra. The behavior of the optical continuum is qualitatively the same as the behavior of the ultraviolet continuum. Cross-correlation of the ultraviolet and optical continuum measurements does not reveal any significant lag between them. The h-beta emission-line variations show the same basic pattern as seen in the continuum and ultraviolet emission lines, with H-beta lagging behind the continuum by about 20 days. This is significantly larger than the about 10 day lag deduced for Ly-alpha.A large, international program of ground-based optical spectroscopy and photometry of the variable Seyfert 1 galaxy NGC 5548 undertaken in support of an IUE monitoring campaign is described. This contribution presents the data base and describes the methods used to correct for systematic differences between spectra from different sources. Optical continuum and H-beta emission-line light curves are derived from the spectra. The behavior of the optical continuum is qualitatively the same as the behavior of the ultraviolet continuum. Cross-correlation of the ultraviolet and optical continuum measurements does not reveal any significant lag between them. The h-beta emission-line variations show the same basic pattern as seen in the continuum and ultraviolet emission lines, with H-beta lagging behind the continuum by about 20 days. This is significantly larger than the about 10 day lag deduced for Ly-alpha.Active Galactic Nuclei. II - an Intensive Study of NGC 5548 at Optical Wavelengths.” The Astrophysical Journal 368 (February): 119. doi:10.1086/169675.
Academic Journal
Dietrich, M., W. Kollatschny, B. M. Peterson, J. Bechtold, R. Bertram, N. G. Bochkarev, T. A. Boroson, et al. 1993. “Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. IV - Intensity Variations of the Optical Emission Lines of NGC 5548.” The Astrophysical Journal 408 (May): 416. doi:10.1086/172599.
Academic Journal
Rodriguez‐Pascual, P. M., D. Alloin, J. Clavel, D. M. Crenshaw, K. Horne, G. A. Kriss, J. H. Krolik, et al. 1997. “Steps Toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. IX. Ultraviolet Observations of Fairall 9.” The Astrophysical Journal Supplement Series 110 (1) (May): 9–20. doi:10.1086/312996.
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[AR] MacAlpine, G. M.
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