Abstract
The recently constructed Dehnen-Binney set of mass models for the galaxy is used to show that the decaying neutrino theory for the ionization of the interstellar medium (Sciama 1990a 1993) requires the neutrino halo of the galaxy to be as flattened as is observationally permitted (axial ratioq =0.2 or shape E8). The argument involves an evaluation of the contribution of red-shifted decay photons from the cosmological distribution of neutrinos to the extragalactic diffuse background at 1500°A. This contribution must be as large as is observationally permitted. These two requirements depend on the decay lifetime τ in potentially conflicting ways. For consistency to be achieved, τ must lie within 30% of 1023seconds.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
C. Armand, B. Milliard, and J. M. DeharvengAstron. and Astrophys. 284(1994) 12.
J. N. Bahcall, C. Flynn, and A. GouldAstrophys. J. 389(1992) 234.
J. N. Bahcall, C. Flynn, A. Gould, and S. KirhakosAstrophys. J. 435(1994) L51.
J. J. Binney, A. May, and J. P. OstrikerMNRAS 226(1987) 149.
J. J. Binney and S. TremaineGalactic DynamicsPrinceton University Press, Princeton (1987).
S. BowyerAnn. Rev. Astr. Ap. 29(1991) 59.
W. Dehnen and J. J. BinneyMNRASin press (1997).
S. Dodelson and J. M. JubasMNRAS 266(1994) 886.
E.I.Gates, G. Gyuk, and M.S. TurnerAstrophys. J. 449(1995) L123.
A. Gould, J.N. Bahcall, and C. FlynnAstrophys. J. 465(1996) 759.
R. C. HenryAnn. Rev. Astr. Ap. 29(1991) 89.
R. C. Henry and J. MurthyAstrophys. J. 418(1993) L17.
R. Kimble, S. Bowyer, and P. JakobsenPhys. Rev. Lett. 46(1981) 80.
K. Kuijken and G. GilmoreAstrophys. J. 367(1991) L9.
T. Nordgren, J. Cordes, and Y. TerzianAstronom. J. 104(1992) 465.
D. E. OsterbrockAstrophysics of Gaseous Nebulae and Active Galactic NucleiUniversity Science Books, Mill Valley, CA (1989).
J. M.Overduin, P. S. Wesson, and S. BowyerAstrophys. J. 404(1993) 1.
R. J. ReynoldsAstrophys. J. 282(1984) 191.
R. J. ReynoldsAstrophys. J. 348(1990) 153.
R. J. Reynolds, inIAU Symposium No. 144 The Interstellar Disk-Halo Connection in Galaxiesed. H. Bloemen, Kluwer, Dordrecht (1991) 67.
P. D. Sackett, H-W. Rix, B. J. Jarvis, and K. C. FreemanAstrophys. J. 436(1994) 629.
D. W. SciamaAstrophys. J. 364(1990a) 549.
D. W. SciamaNature 346(1990b) 40.
D. W. Sciama, inThe Early Observable Universe from Diffuse Backgroundseds. G. Rocca-Volmerange, J.M. Deharveng and J. Tran Thanh Van, Edition Frontières (1991) 127.
D. W. SciamaModern Cosmology and the Dark Matter ProblemCambridge University Press, Cambridge (1993).
D. W. SciamaAstro-ph 9702188(1997).
F. W. SteckerPhys. Rev. Lett. 45(1980) 1460.
J. H. Taylor and J. M. CordesAstrophys. J. 411(1993) 674.
A. N. Witt and J. K. Petersohn, inFirst Symposium on the Infrared Cirrus and Diffuse Interstellar CloudsASP Conf. Series Vol. 58, eds. R. M. Cutri and W. B. Latter (1994).
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1999 Springer Science+Business Media New York
About this chapter
Cite this chapter
Sciama, D.W. (1999). Decaying Neutrinos and the Flattening of the Galactic Halo. In: Harvey, A. (eds) On Einstein’s Path. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-1422-9_30
Download citation
DOI: https://doi.org/10.1007/978-1-4612-1422-9_30
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4612-7137-6
Online ISBN: 978-1-4612-1422-9
eBook Packages: Springer Book Archive