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31 results on '"Yates, G. J."'

3. The morphology of Sersic-Pastoriza galaxies

Author

Yates, G. J, Pedlar, A, Saikia, D. J, Unger, S. W, and Axon, D. J

Subjects
Astrophysics
Abstract

The authors present the preliminary results of their radio-continuum and neutral hydrogen observations of Sersic-Pastoriza (S-P) galaxies. They show that the central regions contain a population of compact features thought to be young supernova remnants (SNRs) and discuss the overall morphology of the nuclei.

Published
1990

4. European VLBI network observations of Seyfert Nuclei

Author

Pedlar, A., Harrison, B., Unger, S. W., Graham, D. A., Preuss, E., Saikia, D. J., Yates, G. J., Araki, H., editor, Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Miller, H. Richard, editor, and Wiita, Paul J., editor

Published
1988
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5. A study of Sérsic-Pastoriza galaxies

Author

Saikia, D. J., Yates, G. J., Pedlar, A., Axon, D. J., van Gorkom, J., Wolstencroft, R. D., Unger, S. W., Araki, H., editor, Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Miller, H. Richard, editor, and Wiita, Paul J., editor

Published
1988
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7. A study of Sérsic-Pastoriza galaxies

Author

Saikia, D. J., primary, Yates, G. J., additional, Pedlar, A., additional, Axon, D. J., additional, van Gorkom, J., additional, Wolstencroft, R. D., additional, and Unger, S. W., additional

Published
1988
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9. The extended narrow line region of NGC 4151. I. Emission line ratios and their implications

Author

Penston, M. V., Robinson, A., Alloin, D., Appenzeller, I., Aretxaga, I., Axon, D. J., Baribaud, T., Barthel, P., Baum, S. A., Boisson, C., de Bruyn, A. G., Clavel, J., Colina, L., Dennefeld, M., Diaz, A., Dietrich, M., Durret, F., Dyson, J. E., Gondhalekar, P., van Groningen, E., Jablonka, P., Jackson, N., Kollatschny, W., Laurikainen, E., Lawrence, A., Masegosa, J., McHardy, I., Meurs, E. J. A., Miley, G., Moles, M., O'Brien, P., O'Dea, C., del Olmo, A., Pedlar, A., Perea, J., Perez, E., Perez-Fournon, I., Perry, J., Pilbratt, G., Rees, M., Robson, I., Rodriguez-Pascual, P., Rodriguez Espinosa, J. M., Santos-Lleo, M., Schilizzi, R., Stasinska, G., Stirpe, G. M., Tadhunter, C., Terlevich, E., Terlevich, R., Unger, S., Vila-Vilaro, V., Vilchez, J., Wagner, S. J., Ward, M. J., Yates, G. J., Penston, M. V., Robinson, A., Alloin, D., Appenzeller, I., Aretxaga, I., Axon, D. J., Baribaud, T., Barthel, P., Baum, S. A., Boisson, C., de Bruyn, A. G., Clavel, J., Colina, L., Dennefeld, M., Diaz, A., Dietrich, M., Durret, F., Dyson, J. E., Gondhalekar, P., van Groningen, E., Jablonka, P., Jackson, N., Kollatschny, W., Laurikainen, E., Lawrence, A., Masegosa, J., McHardy, I., Meurs, E. J. A., Miley, G., Moles, M., O'Brien, P., O'Dea, C., del Olmo, A., Pedlar, A., Perea, J., Perez, E., Perez-Fournon, I., Perry, J., Pilbratt, G., Rees, M., Robson, I., Rodriguez-Pascual, P., Rodriguez Espinosa, J. M., Santos-Lleo, M., Schilizzi, R., Stasinska, G., Stirpe, G. M., Tadhunter, C., Terlevich, E., Terlevich, R., Unger, S., Vila-Vilaro, V., Vilchez, J., Wagner, S. J., Ward, M. J., and Yates, G. J.

Abstract

The paper presents the first results from long-slit spectra of the Seyfert galaxy NGC 4151 which give average diagnostic ratios of weak lines in the extended narrow line region (ENLR) of that galaxy and the first direct density measurement in an ENLR. These data confirm that the ENLR is kinematically undisturbed gas in the disc of the galaxy which is illuminated by an ionizing continuum stronger by a factor of 13 than a power law interpolated between observed ultraviolet and X-ray fluxes. Explanations of this apparent excess include a hot thermal continuum, time variations and an anisotropic radiation field. The authors give reasons for favouring anisotropy which might be caused by shadowing by a thick accretion disc or by relativistic beaming. Shadowing by a molecular torus is unlikely, given the absence of an infrared signal from the reradiated flux absorbed by any torus. Anisotropy would have important implications for the bolometric luminosity and nature of active galactic nuclei

Published
1990

16. The extended narrow line region of NGC 4151 I. Emission line ratios and their implications

Author

Penston, M. V., Robinson, A., Alloin, D., Appenzeller, I., Aretxaga, I., Axon, D. J., Baribaud, T., Barthel, P., Baum, S. A., Boisson, C., Bruyn, A. G. D., Clavel, J., Colina, L., Dennefeld, M., Diaz, A., Dietrich, M., Durret, F., Dyson, J. E., Gondhalekar, P., Groningen, E. V., Jablonka, P., Jackson, N., Kollatschny, W., Laurikainen, E., Lawrence, A., Masegosa, J., Mchardy, I., Meurs, E. J. A., Miley, G., Moles, M., O Brien, P., O Dea, C., Olmo, A. D., Pedlar, A., Perea, J., Perez, E., Perez-Fournon, I., Perry, J., Pilbratt, G., Rees, M., Robson, I., Rodriguez-Pascua, P., Espinosa, J. M. R., Santos-Lleo, M., Schilizzi, R., Stasinska, G., Stirpe, G. M., Tadhunter, C., Terlevich, E., Terlevich, R., Unger, S., Vila-Vilaro, V., Jose M. Vilchez, Wagner, S. J., Ward, M. J., and Yates, G. J.

19. Nanosecond Optical Shutters

Author

King, N. S. P., primary, Yates, G. J., additional, Jaramillo, S. A., additional, Pagano, T. S., additional, and Black, J. Paul, additional

Published
1986
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