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Quasars

  • Chapter
The Century of Space Science

Abstract

To the naked eye the night sky is filled with stars. But outside of a quite narrow slice of the whole electromagnetic spectrum a radically different sky is seen. Over two huge frequency ranges, each about 10 decades broad, utterly different objects dominate the view. Both at the long, radio wavelengths, and at the high X-ray and γ-ray energies, the brightest things in the sky are quasars. Only in the three decades of frequency from the ultraviolet, through the visible band and into the infrared do stars dominate, and in the infrared much of the starlight is seen only indirectly, having been absorbed and re-emitted by dust around the stars. Three decades is much broader than the octave-wide band to which our human eyes are sensitive but, compared with the 20 decades of frequency opened up to astronomy during the space age, it is small.

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General

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  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA

    Martin Elvis

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  1. SRON — National Institute for Space Research, Utrecht, The Netherlands

    Johan A. M. Bleeker

  2. ISSI — International Space Science Institute, Bern, Switzerland

    Johannes Geiss

  3. ESA — European Space Agency, Paris, France

    Martin C. E. Huber

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Elvis, M. (2001). Quasars. In: Bleeker, J.A.M., Geiss, J., Huber, M.C.E. (eds) The Century of Space Science. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0320-9_23

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  • DOI: https://doi.org/10.1007/978-94-010-0320-9_23

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