Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-26T07:41:11.987Z Has data issue: false hasContentIssue false
  • English
  • Français

Magnetic Fields in Disks and Halos of Galaxies

Published online by Cambridge University Press:  17 September 2012

R. Beck
R. Beck*
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Get access

Abstract

Radio synchrotron emission, its polarization and its Faraday rotation are powerful tools to study the strength and structure of interstellar magnetic fields. Total fields in gas-rich spiral arms and bars of nearby galaxies have strengths of 20–30 μG and are dynamically important. Ordered fields with spiral structure exist in grand-design, flocculent and even irregular galaxies. The strongest ordered fields of 5–10 μG are found in interarm regions, sometimes forming “magnetic spiral arms”. Faraday rotation sometimes reveals large-scale patterns which are signatures of coherent fields generated by dynamos, but in most galaxies the field has a complicated structure. – Magnetic fields with X-shaped patterns are observed in radio halos around edge-on galaxies. The synchrotron scale height allows to measure the mean outflow velocity, which seems to increase with the star-formation rate.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 56: The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall? , 2012 , pp. 51 - 59
Copyright
© EAS, EDP Sciences, 2012

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Arshakian, T.G., Beck, R., Krause, M., & Sokoloff, D., 2009, A&A, 494, 21
Battaner, E., & Florido, E., 2000, Fund. Cosmic Phys., 21, 1
Beck, R., 2005,in Cosmic Magnetic Fields, ed. R. Wielebinski & R. Beck (Berlin: Springer), 41CrossRefGoogle Scholar
Beck, R., 2007, A&A, 470, 539
Beck, R., 2009, Rev. Mex. A&A, 36, 1
Beck, R., & Gaensler, B.M., 2004, New Astron. Rev., 48, 1289CrossRef
Beck, R., & Hoernes, P., 1996, Nature, 379, 47CrossRef
Beck, R., & Krause, M., 2005, Astron. Nachr., 326, 414CrossRef
Beck, R., Brandenburg, A., Moss, D., Shukurov, A., & Sokoloff, D., 1996, ARA&A, 34, 155CrossRef
Beck, R., Fletcher, A., Shukurov, A., et al., 2005, A&A, 444, 739
Bell, E.F., 2003, ApJ, 586, 794CrossRef
Brandenburg, A., Donner, K.J., Moss, D., et al., 1993, A&A, 271, 36
Brentjens, M.A., & de Bruyn, A.G., 2005, A&A, 441, 1217
Chyży, K.T., & Beck, R., 2004, A&A, 417, 541
Chyży, K.T., & Buta, R.J., 2008, ApJ, 677, L17CrossRef
de Avillez, M.A., & Breitschwerdt, D., 2005, A&A, 436, 585
Dobbs, C.L., & Price, D.J., 2008, MNRAS, 383, 497CrossRef
Dumke, M., & Krause, M., 1998, in The Local Bubble and Beyond, ed. D. Breitschwerdt, M.J. Freyberg & J. Trümper (Berlin: Springer), 555Google Scholar
Dumke, M., Krause, M., Wielebinski, R., & Klein, U., 1995, A&A, 302, 691
Elstner, D., Meinel, R., & Beck, R., 1992, A&AS, 94, 587
Ferguson, A.M.N., Wyse, R.F.G., Gallagher, J.S., & Hunter, D.A., 1998, ApJ, 506, L19CrossRef
Fletcher, A., Berkhuijsen, E.M., Beck, R., & Shukurov, A., 2004, A&A, 414, 53
Fletcher, A., Beck, R., Shukurov, A., Berkhuijsen, E.M., & Horellou, C., 2011, MNRAS, 412, 2396CrossRef
Frick, P., Beck, R., Berkhuijsen, E.M., & Patrikeev, I., 2001, MNRAS, 327, 1145CrossRef
Gaensler, B.M., Haverkorn, M., Staveley-Smith, L., et al., 2005, Science, 307, 1610CrossRef
Golla, G., & Hummel, E., 1994, A&A, 284, 777
Gómez, G.C., & Cox, D.P., 2002, ApJ, 580, 235CrossRef
Hanasz, > M., Otmianowska-Mazur, K., & Lesch, H., 2002, A&A, 386, 347
Hanasz, M., Kowal, G., Otmianowska-Mazur, K., & Lesch, H., 2004, ApJ, 605, L33CrossRef
Heesen, V., Beck, R., Krause, M., & Dettmar, R.-J., 2009a, A&A, 494, 563
Heesen, V., Krause, M., Beck, R., & Dettmar, R.-J., 2009b, A&A, 506, 1123
Helfer, T.T., Thornley, M.D., Regan, M.W., et al., 2003, ApJS, 145, 259CrossRef
Hughes, A., Wong, T., Ekers, R., et al., 2006, MNRAS, 370, 363CrossRef
Klein, U., Wielebinski, R., & Morsi, H.W., 1988, A&A, 190, 41PubMed
Krause, M., 1990, in Galactic and Intergalactic Magnetic Fields, ed. R. Beck, R. Wielebinski & P.P. Kronberg (Dordrecht: Kluwer), 187CrossRef
Krause, M., 2009, Rev. Mex. AyA, 36, 25
Krause, M., Hummel, E., & Beck, R., 1989a, A&A, 217, 4PubMed
Krause, M., Beck, R., & Hummel, E., 1989b, A&A, 217, 17PubMed
Kronberg, P.P., Bernet, M.L., Miniati, F., et al., 2008, ApJ, 676, 70CrossRef
Lisenfeld, U., Völk, H.J., & Xu, C., 1996, A&A, 314, 745
Niklas, S., & Beck, R., 1997, A&A, 320, 54
Patrikeev, I., Fletcher, A., Stepanov, R., et al., 2006, A&A, 458, 441
Price, D.J., & Bate, M.R., 2008, MNRAS, 385, 1820CrossRef
Shukurov, A., Sokoloff, D., Subramanian, K., & Brandenburg, A., 2006, A&A, 448, L33
Soida, M., Beck, R., Urbanik, M., &Braine, J., 2002, A&A, 394, 47
Stepanov, R., Arshakian, T.G., Beck, R., Frick, P., & Krause, M., 2008, A&A, 480, 45
Tabatabaei, F., Beck, R., Krause, M., et al., 2007a, A&A, 466, 509
Tabatabaei, F., Beck, R., Krügel, E., et al., 2007b, A&A, 475, 133
Tabatabaei, F., Krause, M., Fletcher, A., & Beck, R., 2008, A&A, 490, 1005
Thompson, T.A., Quataert, E., Waxman, E., Murray, N., & Martin, C.L., 2006, ApJ, 645, 186CrossRef
Tüllmann, R., Dettmar, R.-J., Soida, M., Urbanik, M., & Rossa, J., 2000, A&A, 364, L36
Vázquez-Semadeni, E., Kim, J., & Ballesteros-Paredes, J., 2005, ApJ, 630, L49CrossRef
Vollmer, B., Soida, M., Beck, R., et al., 2007, A&A, 464, L37
Weżgowiec, M., Urbanik, M., Vollmer, B., et al., 2007, A&A, 471, 93