Abstract
Fifty-three spectrograms in the optical region (3700–7300 Å) with the spectral resolution ∼8 Å have been obtained for the Seyfert nucleus of the galaxy NGC 3227 with the 6-m telescope on January 1977, while the nucleus was in the historically important epoch of its extreme maximum brightness. Width of the slit was 1″, length of the box during the spectra measurements was 1.5″. Data obtained by us and those compiled from literature showed that profiles of the Balmer lines Hα, Hβ and Hγ are different, evidencing that the gas emitting these lines is highly self-absorbed. It was shown that narrow components of the profiles revealed by Rubin and Ford kept their positions (radial velocities) over 25 years. The components showed intensity variations compared to the central one from minimum to maximum of the nucleus brightness. The same variations were observed by us earlier in the emission line profiles of the NGC 7469 nucleus spectrum. Narrow profile components can reflect long-lived flows or jets in the broad line region (BLR). Obtained facts evidenced that long-lived gas streams and flows causing narrow components of broad line profiles presented not only when BLR of accretion disc is strong but when BLR of accretion disc declined. Blue bump at radial velocity of −5000 km/s in Hγ profile was revealed in spectra of high states of the nucleus, which disappeared in low state. One of the interpretations of this event can be in the framework of a model of one-sided or two-sided gas ejection during the high state of the nucleus, positive radial velocities of which being screened out by a circumnuclear disk.
Similar content being viewed by others
References
Adams, Th. and Weedman, D.: 1975, ApJ 199, 19.
Anderson, K.S.: 1970, ApJ 162, 743.
Barbieri, C., di Serego Alighieri, S. and Sambon, M.: 1977, A&A 57, 353.
de Vaucouleurs, G.: 1975, in: G.P. Kuiper (ed.), Stars and Stellar Systems, vol. IX, The University of Chicago Press, p. 557.
de Vaucouleurs, G. and de Vaucouleurs, A.: 1968, Publ. Depart. Astron. Texas Univ. 11(SII), N7.
Dibaj, E.A. and Pronik, V.I.: 1967, Russ. Astron. J. 44, 952.
Elvis, M., Maccacaro, T., Wilson, A.S., Ward, M.J., Penston, M.V., Fosbury, R.A.E. and Perola, G.C.: 1978, MNRAS 183, 129.
Gaskell, C.M. and Sparke, L.S.: 1986, ApJ 305, 175.
Gonzalez Delgado, R.M. and Perez, E.: 1997, MNRAS 284, 931.
Hartigan, P., Edwards, S. and Ghandour, L.: 1995, ApJ 452, 736.
Khachikian, E.Ye. and Weedman, D.W.: 1971, Astrofizika 7, 389.
Khachikian, E.Ye. and Weedman, D.W.: 1974, ApJ 192, 581.
Kodaira, K., Iye, M. and Nishimura, S.: 1979, Publ. Astron. Soc. Jpn. 31, 647.
Lyutyi, V.M.: 1977, Russ. Astron. J. 54, 1153.
McAlary, C.W. and Rieke, G.H.: 1988, ApJ 333, 1.
Mediavella, E. and Arribas, S.: 1993, Nature 365, 420.
Merkulova, N.I. and Pronik, I.I.: 1983, Izv. Krimsk. Astrofiz. Obs. 68, 93.
Osterbrock, D.E.: 1977, ApJ 215, 733.
Penston, M.V., Penston, M.J., Selmes, R.A., Becklin, E.E. and Neugebauer, G.: 1974, MNRAS 169, 357.
Peterson, B.M., Foltz, C.B., Byard, P.L. and Wagner, R.M.: 1982, ApJS 49, 469.
Peterson, B.M., Grenshaw, D.M. and Mayers, K.A.: 1985, ApJ 298, 283.
Pronik, I.I.: 1983, Izv. Krimsk. Astrofiz. Obs. 68, 81 (Bull. Crimean Astrophys. Obs. 68, 75).
Pronik, I.I.: 1987, in: E. Khachikian, K. Fricke and J. Melnick (eds.), Proceedings of IAU Symosium 121 on “Observational Evidence of Activity in Galaxies”, p. 169.
Pronik, I.I. and Metik, L.P.: 2003, Astron. Astrophys. Trans. 22, 713.
Pronik, I.I., Metik, L.P. and Merkulova, N.I.: 1997, A&A 318, 721.
Pronik, I.I., Merkulova, N.I. and Metik, L.P.: 1999, in: Y. Terzian, D. Weedman and E. Khachikian (eds.), Proceedings of IAU Symposium No. 194 on “Activity in Galaxies and Related Phenomena”, p. 416.
Ptak, A., Yaqoob, T., Selemitsos, P.J., Mushotzky, R. and Otani, C.: 1994, ApJ 436, L31.
Quisbert, J., Binette, L., Daltabuit, E. and Canto, J.: 1989, Publ. Astron. Soc. Pacific 101, 1078.
Rokaki, E., Boisson, C. and Collin-Souffrin, S.: 1992, Astron. Astrophys. 253, 57.
Rosenblatt, E.I., Malkan, M.A., Sargent, W.L.W. and Readhead, A.C.S.: 1992, ApJS 81, 59.
Rosenblatt, E.I., Malkan, M.A., Sargent, W.L.W. and Readhead, A.C.S.: 1994, ApJS 93, 73.
Rubin, V.C. and Ford, W.K., Jr.: 1968, ApJ 154, 431.
Salamanca, J., Alloin, D., Baribaud, T., et al.: 1994, Astron. Astrophys. 282, 742.
Stripe, G.M.: 1990, Astron. Astrophys. Suppl. 85, 1049.
Veilleux, S. and Zheng, W.: 1991, ApJ 377, 89.
Vrtilek, J.M. and Carleton, N.P.: 1985, ApJ 294, 106.
Wampler, E.J.: 1971, ApJ 164, 1.
Winge, C., Peterson, B.M., Home, K. and Pogge, R.W.: 1995, ApJ 445, 680.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Pronik, I., Metik, L. Long-Term Variability Of The Optical Emission Lines In The Nuclear Spectrum Of The Seyfert Galaxy Ngc 3227. Astrophys Space Sci 299, 245–261 (2005). https://doi.org/10.1007/s10509-005-8193-6
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s10509-005-8193-6