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3. STEPS TOWARD DETERMINATION OF THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI .1. AN 8 MONTH CAMPAIGN OF MONITORING NGC-5548 WITH IUE

Author

CLAVEL J, REICHERT GA, ALLOIN D, CRENSHAW DM, KRISS G, KROLIK JH, MALKAN MA, NETZER H, PETERSON BM, WAMSTEKER W, ALTAMORE, Aldo, BARIBAUD T, BARR P, BECK S, BINETTE L, BROMAGE GE, BROSCH N, DIAZ AI, FILIPPENKO AV, FRICKE K, GASKELL CM, GIOMMI P, GLASS IS, GONDHALEKAR P, HACKNEY RL, HALPERN JP, HUTTER DJ, JORSATER S, KINNEY AL, KOLLATSCHNY W, KORATKAR A, KORISTA KT, LAOR A, LASOTA JP, LEIBOWITZ E, MAOZ D, MARTIN PG, MAZEH T, MEURS EJA, NAIR AD, OBRIEN P, PELAT D, PEREZ E, PEROLA GC, PTAK RL, RODRIGUEZPASCUAL P, ROSENBLATT EI, SADUN AC, SANTOSLLEO M, SHAW RA, SMITH PS, STIRPE GM, STONER R, SUN WH, ULRICH MH, VANGRONINGEN E, ZHENG W., Clavel, J, Reichert, Ga, Alloin, D, Crenshaw, Dm, Kriss, G, Krolik, Jh, Malkan, Ma, Netzer, H, Peterson, Bm, Wamsteker, W, Altamore, Aldo, Baribaud, T, Barr, P, Beck, S, Binette, L, Bromage, Ge, Brosch, N, Diaz, Ai, Filippenko, Av, Fricke, K, Gaskell, Cm, Giommi, P, Glass, I, Gondhalekar, P, Hackney, Rl, Halpern, Jp, Hutter, Dj, Jorsater, S, Kinney, Al, Kollatschny, W, Koratkar, A, Korista, Kt, Laor, A, Lasota, Jp, Leibowitz, E, Maoz, D, Martin, Pg, Mazeh, T, Meurs, Eja, Nair, Ad, Obrien, P, Pelat, D, Perez, E, Perola, Gc, Ptak, Rl, Rodriguezpascual, P, Rosenblatt, Ei, Sadun, Ac, Santoslleo, M, Shaw, Ra, Smith, P, Stirpe, Gm, Stoner, R, Sun, Wh, Ulrich, Mh, Vangroningen, E, and Zheng, W.

Subjects
Astronomy, Astrophysics
Published
1991

4. Spectrscopic monitoring of active galactic nuclei. 3: Size of the broad line region in NGC 3227

Author

Salamanca, I., Alloin, D., Baribaud, T., Axon, D.J., Bruyn, A.G. de, Goad, M., Gondhalekar, P.M., Groningen, E. van, Jackson, N., Kollatschny, W., Laurikainen, E., Lawrence, A., Masegosa, J., O'Brien, P.T., Pelat, D., Penston, M.V., Perez, E., Perez-Fournon, I., Robinson, A., Santos-Lleo, M., Stirpe, G.M., Tadhunter, C., Terlevich, R.J., Unger, S., Wagner, S.J., and Wanders, I.

Published
1994

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

Author

Penston, M V, 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, JE, GONDHALEKAR, P, VANGRONINGEN, E, JABLONKA, P, JACKSON, N, KOLLATSCHNY, W, LAURIKAINEN, E, MASEGOSA, J, McHardy, I, MEURS, EJA, MILEY, G, MOLES, M, OBRIEN, P, ODEA, C, DELOLMO, A, PEDLAR, A, PEREA, J, PEREZ, E, Perez-Fournon, I, PERRY, J, PILBRATT, G, REES, M, Robson, I, RODRIGUEZPASCUAL, P, RODRIGUEZ, JM, SANTOSLLEO, M, SCHILIZZI, R, STASINSKA, G, STIRPE, GM, TADHUNTER, C, TERLEVICH, E, TERLEVICH, R, UNGER, S, Vila-vilaro, A, VILCHEZ, J, WAGNER, SJ, WARD, MJ, YATES, GJ, and Kapteyn Astronomical Institute

Published
1990

6. Spectroscopic monitoring of active galactic nuclei. III. Size of the broad line region in NGC 3227

Author

Salamanca, I., Alloin, D., Baribaud, T., Axon, D., de Bruyn, G., Goad, M., Gondhalekar, P., van Groningen, E., Jackson, N., Kollatschny, W., Laurikainen, E., Lawrence, A., Masegosa, J., O'Brien, P., Pelat, D., Penston, M. V., Perez, E., Perez-Fournon, I., Robinson, A., Santos-Lleo, M., Stirpe, G. M., Tadhunter, C., Terlevich, R., Unger, S., Wagner, S., Wanders, I., Salamanca, I., Alloin, D., Baribaud, T., Axon, D., de Bruyn, G., Goad, M., Gondhalekar, P., van Groningen, E., Jackson, N., Kollatschny, W., Laurikainen, E., Lawrence, A., Masegosa, J., O'Brien, P., Pelat, D., Penston, M. V., Perez, E., Perez-Fournon, I., Robinson, A., Santos-Lleo, M., Stirpe, G. M., Tadhunter, C., Terlevich, R., Unger, S., Wagner, S., and Wanders, I.

Abstract

For pt.II see ibid., vol.269, no.1-2, p.39-53 (1993). The authors present the results of a five-month monitoring campaign of the active galactic nucleus in NGC 3227. The Hbeta and Halpha emission lines and the optical continuum have been analysed. The optical AGN continuum and the broad-line region (BLR) emission in NGC 3227 appear to vary by about 40% on a timescale of 1.5 month. The levels of the broad-line emission and the 675.0 nm continuum are well correlated, a fact consistent with the assumption that the BLR material is photoionised by the central continuum source. Cross-correlation analyses between the light curves of the 675.0 nm AGN continuum and the BLR H emission indicate that the lag of the BLR emission with respect to the continuum variations is 17plusmn7 days. This result suggests that the BLR clouds that are affected by the changes in the flux of the central ionising source lie about 17 light days away from it

Published
1994

7. Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. I. An 8 month campaign of monitoring NGC 5548 with IUE

Author

Clavel, J., Reichert, G. A., Alloin, D., Crenshaw, D. M., Kriss, G., Krolik, J. H., Malkan, M. A., Netzer, H., Peterson, B. M., Wamsteker, W., Altamore, A., Baribaud, T., Barr, P., Beck, S., Binette, L., Bromage, G. E., Brosch, N., Diaz, A. I., Filippenko, A. V., Fricke, K., Gaskell, C. M., Giommi, P., Glass, I. S., Gondhalekar, P., Hackney, R. L., Halpern, J. P., Hutter, D. J., Jorsater, S., Kinney, A. L., Kollatschny, W., Koratkar, A., Korista, K. T., Laor, A., Lasota, J. P., Leibowitz, E., Maoz, D., Martin, P. G., Mazeh, T., Meurs, E. J. A., Nair, A. D., O'Brien, P., Pelat, D., Perez, E., Perola, G. C., Ptak, R. L., Rodriguez-Pascual, P., Rosenblatt, E. I., Sadun, A. C., Santos-Lleo, M., Shaw, R. A., Smith, P. S., Stirpe, G. M., Stoner, R., Sun, W. H., Ulrich, M. -H, van Groningen, E., Zheng, W., Clavel, J., Reichert, G. A., Alloin, D., Crenshaw, D. M., Kriss, G., Krolik, J. H., Malkan, M. A., Netzer, H., Peterson, B. M., Wamsteker, W., Altamore, A., Baribaud, T., Barr, P., Beck, S., Binette, L., Bromage, G. E., Brosch, N., Diaz, A. I., Filippenko, A. V., Fricke, K., Gaskell, C. M., Giommi, P., Glass, I. S., Gondhalekar, P., Hackney, R. L., Halpern, J. P., Hutter, D. J., Jorsater, S., Kinney, A. L., Kollatschny, W., Koratkar, A., Korista, K. T., Laor, A., Lasota, J. P., Leibowitz, E., Maoz, D., Martin, P. G., Mazeh, T., Meurs, E. J. A., Nair, A. D., O'Brien, P., Pelat, D., Perez, E., Perola, G. C., Ptak, R. L., Rodriguez-Pascual, P., Rosenblatt, E. I., Sadun, A. C., Santos-Lleo, M., Shaw, R. A., Smith, P. S., Stirpe, G. M., Stoner, R., Sun, W. H., Ulrich, M. -H, van Groningen, E., and Zheng, W.

Abstract

The authors present emission-line and ultraviolet continuum observations of a type I Seyfert galaxy in which the time resolution is adequate for describing the character of variability. Using the IUE satellite, the nucleus of NGC 5548 was observed every 4 days for a period of 8 months. Its mean properties-continuum shape, line ratios-are not unusual for type I Seyfert galaxies, but it was found to be strongly variable. The ultraviolet continuum flux and broad emission line fluxes varied significantly, going through three large maxima and three deep minima. The great majority of all variations were well resolved in time. The data lend qualitative support to the view that photoionization by the nuclear continuum is responsible for driving the emission lines

Published
1991
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8. 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

9. Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. I - an 8 month campaign of monitoring NGC 5548 with IUE

Author

Clavel, J., primary, Reichert, G. A., additional, Alloin, D., additional, Crenshaw, D. M., additional, Kriss, G., additional, Krolik, J. H., additional, Malkan, M. A., additional, Netzer, H., additional, Peterson, B. M., additional, Wamsteker, W., additional, Altamore, A., additional, Baribaud, T., additional, Barr, P., additional, Beck, S., additional, Binette, L., additional, Bromage, G. E., additional, Brosch, N., additional, Diaz, A. I., additional, Filippenko, A. V., additional, Fricke, K., additional, Gaskell, C. M., additional, Giommi, P., additional, Glass, I. S., additional, Gondhalekar, P., additional, Hackney, R. L., additional, Halpern, J. P., additional, Hutter, D. J., additional, Joersaeter, S., additional, Kinney, A. L., additional, Kollatschny, W., additional, Koratkar, A., additional, Korista, K. T., additional, Laor, A., additional, Lasota, J.-P., additional, Leibowitz, E., additional, Maoz, D., additional, Martin, P. G., additional, Mazeh, T., additional, Meurs, E. J. A., additional, Nair, A. D., additional, O'Brien, P., additional, Pelat, D., additional, Perez, E., additional, Perola, G. C., additional, Ptak, R. L., additional, Rodriguez-Pascual, P., additional, Rosenblatt, E. I., additional, Sadun, A. C., additional, Santos-Lleo, M., additional, Shaw, R. A., additional, Smith, P. S., additional, Stirpe, G. M., additional, Stoner, R., additional, Sun, W. H., additional, Ulrich, M.-H., additional, van Groningen, E., additional, and Zheng, W., additional

Published
1991
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11. Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. I. An 8 month campaign of monitoring NGC 5548 with IUE

Author

Clavel, J., Reichert, G. A., Alloin, D., Crenshaw, D. M., Kriss, G., Krolik, J. H., Malkan, M. A., Netzer, H., Peterson, B. M., Wamsteker, W., Altamore, A., Baribaud, T., Barr, P., Beck, S., Luc Binette, Bromage, G. E., Brosch, N., Diaz, A. I., Filippenko, A. V., Fricke, K., Gaskell, C. M., Giommi, P., Glass, I. S., Gondhalekar, P., Hackney, R. L., Halpern, J. P., Hutter, D. J., Jörsäter, S., Kinney, A. L., Kollatschny, W., Koratkar, A., Korista, K. T., Laor, A., Lasota, J. P., Leibowitz, E., Maoz, D., Martin, P. G., Mazeh, T., Meurs, E. J. A., Nair, A. D., O Brien, P., Pelat, D., Perez, E., Perola, G. C., Ptak, R. L., Rodriguez-Pascual, P., Rosenblatt, E. I., Sadun, A. C., Santos-Lleo, M., Shaw, R. A., Smith, P. S., Stirpe, G. M., Stoner, R., Sun, W. H., Ulrich, M. -H, Groningen, E., and Zheng, W.

Subjects
Galaxies: individual (NGC 5548), Seyfert [Galaxies], Galaxies: Seyfert, spectra [Ultraviolet], individual (NGC 5548) [Galaxies], nuclei [Galaxies], Física, Ultraviolet: spectra, Galaxies: nuclei
Abstract

This is an electronic version of an article published in The Astrophysical Journal. Clavel, J. et al. Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. I. An 8 month campaign of monitoring NGC 5548 with IUE. The Astrophysical Journal 366 (1991): 64-81

12. 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.

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