Готові списки джерел за темами / Extended emission-line regions

Добірка наукової літератури з теми "Extended emission-line regions"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Extended emission-line regions"

1

Stockton, Alan, Hai Fu, and Gabriela Canalizo. "QSO extended emission-line regions." New Astronomy Reviews 50, no. 9-10 (November 2006): 694–700. http://dx.doi.org/10.1016/j.newar.2006.06.024.

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2

Robinson, A. "Extended Emission-Line Regions Around AGN." International Astronomical Union Colloquium 159 (1997): 280–87. http://dx.doi.org/10.1017/s0252921100040288.

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Анотація:
AbstractHigh-excitation extended emission-line nebulae around active galactic nuclei probably result either from photoionization of the interstellar medium by beamed continuum radiation, or dynamical interactions between radio sources and the ambient gas, or both. Here I discuss the models based on these mechanisms, and their relative importance in radio-quiet and radio-loud active galaxies.
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3

Stockton, Alan, and John W. MacKenty. "Extended emission-line regions around QSOs." Astrophysical Journal 316 (May 1987): 584. http://dx.doi.org/10.1086/165227.

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4

Hutchings, J. B., and P. Hickson. "Extended emission-line regions in active galaxies." Astronomical Journal 95 (May 1988): 1363. http://dx.doi.org/10.1086/114733.

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5

Inskip, K. J., M. Villar-Martín, C. Tadhunter, J. Holt, and R. Morganti. "The origin of extended emission line regions." New Astronomy Reviews 51, no. 1-2 (February 2007): 47–51. http://dx.doi.org/10.1016/j.newar.2006.10.004.

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6

Fu, Hai, and Alan Stockton. "EXTENDED EMISSION-LINE REGIONS: REMNANTS OF QUASAR SUPERWINDS?" Astrophysical Journal 690, no. 1 (December 1, 2008): 953–73. http://dx.doi.org/10.1088/0004-637x/690/1/953.

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7

Husemann, B., L. Wisotzki, S. F. Sánchez, and K. Jahnke. "Extended emission-line regions in low-redshift quasars." Astronomy & Astrophysics 488, no. 1 (July 9, 2008): 145–49. http://dx.doi.org/10.1051/0004-6361:200810276.

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8

Fu, Hai, and Alan Stockton. "A Common Origin for Quasar Extended Emission-Line Regions and Their Broad-Line Regions." Astrophysical Journal 664, no. 2 (July 18, 2007): L75—L78. http://dx.doi.org/10.1086/520959.

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9

Evans, Ian, Anuradha Koratkar, Mark Allen, Zlatan Tsvetanov, and Michael Dopita. "Excitation Mechanism of Extended Emission-Line Regions in Active Galaxies." International Astronomical Union Colloquium 159 (1997): 386–89. http://dx.doi.org/10.1017/s0252921100040537.

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Анотація:
AbstractPhotoionization and shock models of the extended emissionline regions (EELRs) in active galaxies demonstrate that the optical emission lines alone are a poor discriminant of the excitation mechanism. Combining optical and UV data provides a discriminant between nuclear photoionization and autoionizing shock models. Hubble Space Telescope UV spectrophotometry of two Seyferts suggests that the EELRs in these objects are probably photoionized by the nucleus.
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10

Breugel, Wil van. "Extended optical line emission associated with radio galaxies." Canadian Journal of Physics 64, no. 4 (April 1, 1986): 392–97. http://dx.doi.org/10.1139/p86-070.

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Анотація:
Observations of radio galaxies that have extended optical emission-line regions provide a new way of studying the interaction of extragalactic jets with their ambient medium. Their general properties are briefly reviewed and are illustrated using recent results on 4C 29.30 and Minkowski's Object.
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Дисертації з теми "Extended emission-line regions"

1

Fu, Hai. "Extended emission-line regions : Remnants of quasar superwinds." Thesis, 2008. http://hdl.handle.net/10125/20413.

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Анотація:
Thesis (Ph.D.)--University of Hawaii at Manoa, 2008.
Black holes are not only an integral component of galaxies, but they also appear to have played a fundamental role in galaxy evolution. It is theorized that galaxy-scale feedback from high-redshift quasars is key to understanding the properties of the most massive galaxies today. However, direct observations of the feedback have been lacking. Our observations on the extended nebulae around low-redshift quasars show that recent quasar-driven superwinds have drastically altered their environments. The superwind is capable of ejecting most of the interstellar medium to large distances, demonstrating an efficient mechanism that can regulate both star formation and black hole growth. Such superwinds provide local analogs of the quasar feedback hypothesized to have happened in the early universe. Studies of these objects can thus provide important insights into this key stage of galaxy evolution. It was discovered that quasars surrounded by extended nebulae are consuming low-metallicity gas. This finding not only provided the first direct observational evidence that the gas from a merger can indeed be driven to the feeding distance of the central black hole, but also validated the existence of low-metallicity quasars and placed a key constraint on quasar superwind models.
Includes bibliographical references (leaves 152-163).
Also available by subscription via World Wide Web
163 leaves, bound 29 cm
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2

Koekemoer, Anton. "Dynamics and excitation of extended emission-line regions in radio galaxies." Phd thesis, 1995. http://hdl.handle.net/1885/138541.

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3

Farage, Catherine. "The Link Between Extended Line Emission and AGN Feedback in Brightest Cluster Galaxies." Phd thesis, 2011. http://hdl.handle.net/1885/9057.

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This thesis presents a study of the optical emission-line regions of low-redshift brightest cluster galaxies (BCGs) and how these are connected to energy feedback in cluster cores. The cores of massive galaxy clusters appear to undergo cycles of self-regulating energy feedback, in which the output of nuclear activity in BCGs offsets much of the hot cluster gas cooling. Many of the BCGs in these `cool-core' clusters are surrounded by extended filamentary nebulae that produce characteristic low-ionisation emission spectra. The origin and sources of excitation of these structures are not well understood. A sample of BCGs was observed with a new wide-field, optical integral-field spectrograph. These galaxies produce strong line emission with a range of integrated luminosities. Maps of the morphology and velocities of the line-emitting gas are constructed from these data. A deep observation of the nearby galaxy NGC4696, provides a detailed view of the complex emission nebula. In the inner nebula, a bright spiral filament coincides closely with a prominent dust lane. The data reveal velocities in this structure consistent with infalling, orbit-like trajectories encircling the nucleus. A model is presented in which some of the gas in the filaments originated in the accretion of a gas-rich dwarf galaxy. It is suggested that the filaments are excited by ~200km/s ram-pressure-driven shocks as the gas clouds fall through the halo. The shock models described reproduce the optical spectrum of the nebula. Three BCGs with intermediate line luminosities are studied to investigate how the filament structures are related to the processes of feedback in the cluster cores. Two systems, Abell 3581 and Sersic 159-03, appear to be experiencing phases of feedback dominated by AGN heating. The structure and kinematics of the emitting gas in Abell 3581 show evidence for significant interaction between the radio outflows and the optical nebula, and possible accretion flows into the nucleus. X-ray and radio data indicate that Sersic 159-03 is dominated by AGN feedback, but the kinematics of the optical nebula are consistent with infall or outflow along the filaments. The third system, 2A0335+096, is dominated by a cooling and accumulation phase of feedback. The outer nebula forms a disk-like structure, ~14kpc in radius, with a velocity field of rotation about the BCG. Overall, our data are consistent with ongoing AGN-driven feedback in these systems. A comparative study of the line-luminous galaxies in the sample is also presented. The data for several systems show evidence for a correlation between the velocity dispersions and line flux ratios in the nebulae, suggesting a strong contribution from shocks to the excitation. The large-scale excitation properties of the nebulae are assessed using optical diagnostic diagrams and discussed in the context of mixing between shock and stellar photoionisation excitation models. It is suggested that both shock and photoionisation excitation contribute significantly to the properties of the emission in these BCGs, to a degree that varies among the galaxies.
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Частини книг з теми "Extended emission-line regions"

1

Robinson, A. "Photoionization of extended emission line regions." In Cooling Flows in Clusters and Galaxies, 293–303. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2953-1_37.

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2

Wilson, Andrew S. "Extended Emission-Line Regions as Probes of Nuclear Activity in Galaxies." In Physics of Active Galactic Nuclei, 307–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77566-6_74.

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3

Acosta-Pulido, José A. "Testing the Anisotropy of the Central Engine from Extended Emission Line Regions." In The Nearest Active Galaxies, 195–201. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1930-6_29.

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4

Clark, N. E., C. N. Tadhunter, D. J. Axon, and A. Robinson. "The Role of Shocks in the Extended Emission Line Regions of Powerful Radio Galaxies." In ESO Astrophysics Symposia, 320–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-540-69648-3_60.

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5

Vila-Vilaró, Balthasar, Andrew Robinson, and Stefan J. Wagner. "The Extended Narrow Line Region of NGC 4151: Spatial Variations of the Emission Line Ratios and their Implications." In Physics of Active Galactic Nuclei, 434–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77566-6_102.

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6

Pérez-Fournon, Ismael, Baltasar Vila-Vilaó, José A. Acosta-Pulido, J. Ignacio González-Serrano, Marc Balcells, Andrew S. Wilson, and Zlatan Tsvetanov. "Spectroscopy of the Extended Emission Line Regions in NGC 4388." In The Nature of Compact Objects in Active Galactic Nuclei, 40–43. Cambridge University Press, 1994. http://dx.doi.org/10.1017/cbo9780511564765.008.

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Тези доповідей конференцій з теми "Extended emission-line regions"

1

Acosta-Pulido, J. A., A. S. Wilson, and I. Pérez-Fournon. "Are the extended narrow line regions in AGN photoionized by the emission from thick accretion disks?" In Testing the AGN paradigm diagnostics. AIP, 1992. http://dx.doi.org/10.1063/1.42229.

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