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Synthesis and Properties of Diethyl α-cyanovinylphosphonate and Dialkyl carboethoxyvinylphosphonates
이천수,Denney, Donald B. 계명대학교 산업기술연구소 1985 産業技術硏究所 論文報告集 Vol.7 No.-
Dialkyl α-substituted methylenephosphonate와 paraformaldehyde로부터 Dialkyl α-substituted vinyphosphonate 유도체들을 합성했다. 이화합물들의 구조가 IR. ¹H-, ?C- 그리고 ?P-NMR스펙트럼으로부터 diethyl α-cyanovinylphosphonate(Ⅲ), dimethyl carboethoxyvinyphosphonate(Ⅳa) 그리고 dimethyl carboethoxyvinyphosphonatev(Ⅳb)임이 확인되었다. α-substituted methylenephosphonate와 formaldehyde의 반응 mechamism은 methanol, piperidine 그리고 acetic acid 존재하에서 부가 및 제거 반응으로 이루어지고 있다. Dialkyl α-substituted vinyphosphonate derivatives from dialkyl α-substituted methylenephosphonate and paraformaldehyde were synthesized. The products were identified by IR. ¹H-, ?C- and ?P-NMR spectra with diethyl α-cyanovinylphosphonate(Ⅲ), dimethyl arboethoxyvinyphosphonate(Ⅳa) and dimethyl carboethoxyvinyphosphonate(Ⅳb). The mechanism of the reaction of formaldehyde with α-subtituted methylenephosphonate in the presence of methanol, piperidine and acetic acid, probably involves both additional and eleminational reaction.
THE LOW-LUMINOSITY END OF THE RADIUS-LUMINOSITY RELATIONSHIP FOR ACTIVE GALACTIC NUCLEI
Bentz, Misty C.,Denney, Kelly D.,Grier, Catherine J.,Barth, Aaron J.,Peterson, Bradley M.,Vestergaard, Marianne,Bennert, Vardha N.,Canalizo, Gabriela,De Rosa, Gisella,Filippenko, Alexei V.,Gates, Elin IOP Publishing 2013 The Astrophysical journal Vol.767 No.2
<P>We present an updated and revised analysis of the relationship between the H beta broad-line region (BLR) radius and the luminosity of the active galactic nucleus (AGN). Specifically, we have carried out two-dimensional surface brightness decompositions of the host galaxies of nine new AGNs imaged with the Hubble Space Telescope Wide Field Camera 3. The surface brightness decompositions allow us to create 'AGN-free' images of the galaxies, from which we measure the starlight contribution to the optical luminosity measured through the ground-based spectroscopic aperture. We also incorporate 20 new reverberation-mapping measurements of the H beta time lag, which is assumed to yield the average H beta BLR radius. The final sample includes 41 AGNs covering four orders of magnitude in luminosity. The additions and updates incorporated here primarily affect the low-luminosity end of the R-BLR-L relationship. The best fit to the relationship using a Bayesian analysis finds a slope of alpha = 0.533(-0.033)(+0.035), consistent with previous work and with simple photoionization arguments. Only two AGNs appear to be outliers from the relationship, but both of them have monitoring light curves that raise doubt regarding the accuracy of their reported time lags. The scatter around the relationship is found to be 0.19 +/- 0.02 dex, but would be decreased to 0.13 dex by the removal of these two suspect measurements. A large fraction of the remaining scatter in the relationship is likely due to the inaccurate distances to the AGN host galaxies. Our results help support the possibility that the R-BLR-L relationship could potentially be used to turn the BLRs of AGNs into standardizable candles. This would allow the cosmological expansion of the universe to be probed by a separate population of objects, and over a larger range of redshifts.</P>
Adam Cathcart,Christopher Green,Steven Denney 한국학중앙연구원 한국학중앙연구원 2014 THE REVIEW OF KOREAN STUDIES Vol.17 No.2
The North Korean government of Kim Jong-un is experiencing multiple simultaneous challenges to its legitimacy, but few could be more serious than the inflow and circulation of information in society. This paper uses three case studies to specifically examine how the North Korean state is responding to this danger by actively projecting narratives of transformation: “re-defectors,” sports, and Kim Jong-un’s court orchestra, the Moranbong Band. In every case, it becomes clear that the state is employing an active strategy, not only responding to negative external portrayals, but also trying to shape its own image both within and without its borders. In order to understand how the state interacts with the North Korean public, this paper employs Thomas Callaghy’s trifurcated “domain consensus” as a framework by which to sub-categorize Pyongyang’s approach: normative, utilitarian, and coercive. It focuses on the first of these types of consensus formation, the normative, by exploring the information strategies used by the Kim Jong-un government as it seeks to promote a revised Weberian “reciprocity of expectations” with the population.
CALIBRATING C-IV-BASED BLACK HOLE MASS ESTIMATORS
Park, Daeseong,Woo, Jong-Hak,Denney, Kelly D.,Shin, Jaejin IOP Publishing 2013 The Astrophysical journal Vol.770 No.2
<P>We present the single-epoch black hole mass estimators based on the CIV lambda 1549 broad emission line, using the updated sample of the reverberation-mapped active galactic nuclei and high-quality UV spectra. By performing multi-component spectral fitting analysis, we measure the CIV line widths (FWHMCIV and line dispersion, sigma(CIV)) and the continuum luminosity at 1350 angstrom (L-1350) to calibrate the C-IV-based mass estimators. By comparing with the H beta reverberation-based masses, we provide new mass estimators with the best-fit relationships, i.e., M-BH proportional to L-1350(0.52 +/- 0.09) FWHMCIV0.56 +/- 0.48 and M-BH proportional to L-1350(0.52 +/- 0.07) sigma(2)(CIV). The new C-IV-based mass estimators show significant mass-dependent systematic difference compared to the estimators commonly used in the literature. Using the published Sloan Digital Sky Survey QSO catalog, we show that the black hole mass of high-redshift QSOs decreases on average by similar to 0.25 dex if our recipe is adopted.</P>
SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT.VI. REVERBERATING DISK MODELS FOR NGC 5548
Starkey, D.,Horne, Keith,Fausnaugh, M. M.,Peterson, B. M.,Bentz, M. C.,Kochanek, C. S.,Denney, K. D.,Edelson, R.,Goad, M. R.,Rosa, G. De,Anderson, M. D.,Aré,valo, P.,Barth, A. J.,Bazhaw, C.,Borm American Astronomical Society 2017 The Astrophysical journal Vol.835 No.1
<P>We conduct a multiwavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate the temperature structure of its accretion disk. The 19 overlapping continuum light curves (1158 angstrom to 9157 angstrom) combine simultaneous Hubble Space Telescope, Swift, and ground-based observations over a 180 day period from 2014 January to July. Light-curve variability is interpreted as the reverberation response of the accretion disk to irradiation by a central time-varying point source. Our model yields the disk inclination i = 36 degrees +/- 10 degrees, temperature T-1= (44 +/- 6) x 10(3) K at 1 light day from the black hole, and a temperature-radius slope (T proportional to r(-alpha)) of alpha = 0.99 +/- 0.03. We also infer the driving light curve and find that it correlates poorly with both the hard and soft X-ray light curves, suggesting that the X-rays alone may not drive the ultraviolet and optical variability over the observing period. We also decompose the light curves into bright, faint, and mean accretion-disk spectra. These spectra lie below that expected for a standard blackbody accretion disk accreting at L/L-Edd = 0.1.</P>
Goad, M. R.,Korista, K. T.,Rosa, G. De,Kriss, G. A.,Edelson, R.,Barth, A. J.,Ferland, G. J.,Kochanek, C. S.,Netzer, H.,Peterson, B. M.,Bentz, M. C.,Bisogni, S.,Crenshaw, D. M.,Denney, K. D.,Ely, J.,Fa American Astronomical Society 2016 The Astrophysical journal Vol.824 No.1
<P>During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert 1 galaxy NGC 5548 performed from 2014 February to July, the normally highly correlated far UV continuum and broad emission line variations decorrelated for similar to 60-70 days, starting similar to 75 days after the first HST/COS observation. Following this anomalous state, the flux and variability of the broad emission lines returned to a more normal state. This transient behavior, characterized by significant deficits in flux and equivalent width of the strong broad UV emission lines, is the first of its kind to be unambiguously identified in an active galactic nucleus reverberation mapping campaign. The largest corresponding emission line flux deficits occurred for the high ionization, collisionally excited lines C IV and Si IV(+O IV]), and also He II(+O III]), while the anomaly in Ly alpha was substantially smaller. This pattern of behavior indicates a depletion in the flux of photons with E-ph > 54 eV relative to those near 13.6 eV. We suggest two plausible mechanisms for the observed behavior: (i) temporary obscuration of the ionizing continuum incident upon broad line region (BLR) clouds by a moving veil of material lying between the inner accretion disk and inner (BLR), perhaps resulting from an episodic ejection of material from the disk, or (ii) a temporary change in the intrinsic ionizing continuum spectral energy distribution resulting in a deficit of ionizing photons with energies > 54 eV, possibly due to a transient restructuring of the Comptonizing atmosphere above the disk. Current evidence appears to favor the latter explanation.</P>