Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-28T22:34:01.089Z Has data issue: false hasContentIssue false
  • English
  • Français

Filamentary Structures Near the Galactic Center

Published online by Cambridge University Press:  23 September 2016

F. Yusef-Zadeh
F. Yusef-Zadeh*
Affiliation:
LASP, Goddard Space Flight Center and Northwestern University

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Recent studies of the Galactic center environment have revealed a wealth of new thermal and nonthermal features with unusual characteristics. A system of nonthermal filamentary structures tracing magnetic field lines are found to extend over 200pc in the direction perpendicular to the Galactic plane. Ionized structures, like nonthermal features, appear filamentary and show forbidden velocity fields in the sense of Galactic rotation and large line widths. Faraday rotation characteristics and the flat spectral index distributions of the nonthermal filaments suggest a mixture of thermal and nonthermal gas. Furthermore, the relative spatial distributions of the magnetic structures with respect to those of the ionized and molecular gas suggest a physical interaction between these two systems. In spite of numerous questions concerning the origin of the large-scale organized magnetic structures, the mechanism by which particles are accelerated to relativistic energies, and the source or sources of heating the dust and gas, recent studies have been able to distinguish the inner 200pc of the nucleus from the disk of the Galaxy in at least two more respects: (1) the recognition that the magnetic field has a large-scale structure and is strong, uniform and dynamically important; and (2) the physics of interstellar matter may be dominated by the poloidal component of the magnetic field.

Type
The Arc
Information
Symposium - International Astronomical Union , Volume 136: The Galactic Center , 1989 , pp. 243 - 263
Copyright
Copyright © Kluwer 1989 

References

Aitken, D.K., Roche, P.F., Bailey, J.A., Briggs, G.P., Hough, J.H. and Thomas, J.A. 1986, MNRAS , 218, 363.Google Scholar
Altenhoff, W.J., Downes, D., Pauls, T. and Schraml, J. 1978, Astr. Astrophys. Suppl. , 35, 23.Google Scholar
Anantharamaiah, K.R. and Yusef-Zadeh, F. this volume. Google Scholar
Bally, J., Stark, A., Wilson, R. and Henkel, C. 1988, Ap.J. , 324, 223.Google Scholar
Bally, J. and Yusef-Zadeh, F. 1989, Ap.J. (January 15 issue).Google Scholar
Bally, J., Yusef-Zadeh, F. and Hollis, J.M. this volume. Google Scholar
Benford, G. 1988, Ap.J. (in press).Google Scholar
Bernstein, I.B., and Kulsrud, R.M. 1965, Ap.J. , 142, 479.Google Scholar
Brown, R.L. and Liszt, J.H. 1984, Ann. Rev. Astron. Astrophys. , 22, 223.Google Scholar
Burn, B.F. 1966, Ap.J. , 324, 223.Google Scholar
Chudnovsky, E.M., Field, G.B., Spergel, D.N. and Vilenkin, A. 1986, Phys. Rev. D. , 34, 944.Google Scholar
Dent, W.A., Werner, M.W., Gatley, L., Hildebrand, R.H., Keene, J. and Whitcomb, S.E. 1982, The Galactic Center , eds. Reigler, G.R., Blandford, R.D., (New York: AIP), p33.Google Scholar
Drake, F. 1959, Astr. J. , 64, 329.Google Scholar
Ekers, R., van Gorkom, J.H., Schwarz, U.J. and Goss, W.M. 1983, Astron. Astrophys. , 122, 143.Google Scholar
Geballe, T.R. 1987, The Galactic Center , ed. Backer, D.C. (New York: AIP), p39.Google Scholar
Geballe, T.R. this volume. Google Scholar
Geballe, T.R., Serabyn, E., and Yusef-Zadeh, F. 1989, in preparation. Google Scholar
Genzel, R., Stacy, G.J. and Townes, C.H. this volume. Google Scholar
Goss, W.M., Schwarz, U.J., Ekers, R.D. and van Gorkom, J.H. 1983, IAU Symposium 101, Supernova Remnants ans their X-ray Emission , eds. Danziger, J. and Gorenstein, P., (Dordrecht: Reidel), p65.Google Scholar
Güsten, R. and Downes, D. 1980, Astron. Astrophys. , 87, 6.Google Scholar
Heyvaerts, J., Norman, C. and Pudritz, R. 1988, Ap.J., (in press). Google Scholar
Inoue, M., Fomalont, E., Tsuboi, M., Yusef-Zadeh, F., Morris, M., Tabara, H. and Kato, T. this volume. Google Scholar
Inoue, M., Takahashi, T., Tabara, H., Kato, T. and Tsuboi, M. 1984, Pub.Astr.Soc.Japan. , 36, 633.Google Scholar
Kapitzky, J.E. and Dent, W.A. 1974, Ap.J. , 188, 27.Google Scholar
Kassim, N.E., Erickson, W.C. and LaRosa, T. 1987, The Galactic Center , ed. Backer, D.C. (New York: AIP), p196.Google Scholar
Lasenby, J., Lasenby, A.N. and Yusef-Zadeh, F. this volume. Google Scholar
Liszt, H.S. 1985, Ap.J. (Letters) , 239, L65.Google Scholar
Little, A.G. 1974, IAU Symposium 60, Galactic Radio Astronomy, ed. Kerr, F.J. and Simonson, S. C. III, (Dordrecht: Reidel), p491.Google Scholar
Mezger, P.G., Zylka, R., Salter, C.J., Wink, J.E., Chini, R. and Kreysa, E., this volume. Google Scholar
Mills, B.Y., and Drinkwater, M.J. 1984, J.Ap.Astr. , 5, 43.Google Scholar
Morris, M. this volume. Google Scholar
Morris, M. and Yusef-Zadeh, F. 1985, Astron.J. , 90, 2511.Google Scholar
Morris, M. and Yusef-Zadeh, F. 1988, submitted to Ap.J. Google Scholar
Morris, M. and Yusef-Zadeh, F. 1989, in preparation Google Scholar
Odenwald, S.F. this volume. Google Scholar
Okuda, H., Shibai, H., Matsuhara, H., Kobayashi, Y., Kaifu, N. et al. this volume.Google Scholar
Pauls, T., Downes, D., Mezger, P.G., Churchwell, E., 1976, Astron. Astrophys. 46, 407.Google Scholar
Pauls, T., Mezger, P.G., 1980, Astron. Astrophys. , 85, 26.Google Scholar
Reich, W. this volume. Google Scholar
Reich, W., Sofue, Y. and Furst, E. 1988, preprint.Google Scholar
Seiber, W. and Schlickeiser, R. 1982, Astron. Astrophys. , 113, 314.Google Scholar
Seiradakis, J.H., Lasenby, A.N., Yusef-Zadeh, F., Wielebinski, R. and Klein, U. 1985, Nature , 317, 697.Google Scholar
Serabyn, E. and Güsten, R., 1987, Astron. Astrophys. , 184, 183.Google Scholar
Shibata, K. and Uchida, Y. 1987, Publ.Astron.Soc.Japan , 39, 559.Google Scholar
Sofue, Y. and Fujimoto, M. 1987, Ap.J. (Letters) , 319, L73.Google Scholar
Sofue, Y. and Handa, T. 1984, Nature , 310, 568.Google Scholar
Sofue, Y., Inoue, M., Handa, T., Tsuboi, M., Hirabayashi, H., Morimoto, M., Akabane, K., 1986, Publ. Astron. Soc. Japan , 38, 475.Google Scholar
Sofue, Y., Reich, W., Inoue, M. and Seiradakis, J.H. 1987, Pub.Astr.Soc.Japan. , 39, 95.Google Scholar
Steinberg, J.L. and Lequeux, J. 1963, Radio Astronomy , (McGraw Hill, New York), p193.Google Scholar
Tsuboi, M., Inoue, M., Handa, T., Tabara, H. and Kato, T., Sofue, Y. and Kaifu, N. 1986, Astron.J. , 92, 818.Google Scholar
Vilenkin, A. 1985, Phys. Rep. , 121, 263.Google Scholar
Werner, M.W. and Davidson, J. this volume. Google Scholar
Whiteoak, J.B. and Gardner, F.F. 1973, Astrophys.Lett. , 13, 205.Google Scholar
Wright, A.E. and Barlow, M.J. 1975, MNRAS , 170, 41.Google Scholar
Yusef-Zadeh, F., 1986, Ph.D Thesis, Columbia University. Google Scholar
Yusef-Zadeh, F. and Bally, J. 1989, in preparation. Google Scholar
Yusef-Zadeh, F., Morris, M. 1987a, Ap.J. , 322, 721.Google Scholar
Yusef-Zadeh, F., Morris, M. 1987b, Astron.J. , 94, 1128.Google Scholar
Yusef-Zadeh, F., Morris, M. 1987c, Ap.J. , 320, 545.Google Scholar
Yusef-Zadeh, F., Morris, M. 1988, Ap.J. , 329, 729.Google Scholar
Yusef-Zadeh, F., Morris, M., Chance, D. 1984, Nature , 310, 557.Google Scholar
Yusef-Zadeh, F., Morris, M., Lasenby, A., Seiradakis, J.H., Wielebinski, R. and Klein, U. 1989, in preparation. Google Scholar
Yusef-Zadeh, F., Morris, M., Slee, O.B. and Nelson, G.J. 1986, Ap.J. , 310, 689.Google Scholar
Yusef-Zadeh, F., Morris, M., and van Gorkom, J.H. 1987, in The Galactic Center , ed. Backer, D.C. (New York: AIP), p190.Google Scholar
Yusef-Zadeh, F., Morris, M., and van Gorkom, J.H. this volume. Google Scholar
Yusef-Zadeh, F., Telesco, C. and Decher, R. this volume. Google Scholar