Large scale magnetic fields: Density power spectrum in redshift space

Gopal, Rajesh; Sethi, S.K.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/828

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DC Field	Value	Language
dc.contributor.author	Gopal, Rajesh	-
dc.contributor.author	Sethi, S.K.	-
dc.date.accessioned	2005-12-26T06:06:31Z	-
dc.date.available	2005-12-26T06:06:31Z	-
dc.date.issued	2003	-
dc.identifier.citation	Journal of Astrophysics and Astronomy, 2003, Vol. 24, p51-67.	en
dc.identifier.issn	0250-6335	-
dc.identifier.uri	http://hdl.handle.net/2289/828	-
dc.description.abstract	We compute the density redshift-space power spectrum in the presence of tangled magnetic fields and compare it with existing observations. Our analysis shows that if these magnetic fields originated in the early universe then it is possible to construct models for which the shape of the power spectrum agrees with the large scale slope of the observed power spectrum. However requiring compatibility with observed CMBR anisotropies, the normalization of the power spectrum is too low for magnetic fields to have significant impact on the large scale structure at present. Magnetic fields of a more recent origin generically give density power spectrum α k4 which doesn?t agree with the shape of the observed power spectrum at any scale. Magnetic fields generate curl modes of the velocit y field which increase both the quadrupole and hexadecapole of the redshift space power spectrum. For curl modes, the hexadecapole dominates over quadrupole. So the presence of curl modes could be indicated by an anomalously large hexadecapole, which has not yet been computed from observation. It appears difficult to construct models in which tangled magnetic fields could have played a major role in shaping the large scale structure in the present epoch. However if they did, one of the best ways to infer their presence would be from the redshift space effects in the density power spectrum.	en
dc.format.extent	250170 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Indian Academy of Sciences, Bangalore, India.	en
dc.rights	Indian Academy of Sciences, Bangalore, India.	en
dc.subject	Cosmology	en
dc.subject	Theory—large-scale structure of the universe	en
dc.subject	Magnetic fields—MHD	en
dc.title	Large scale magnetic fields: Density power spectrum in redshift space	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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