Titlebook: Galaxies and Cosmology; Françoise Combes,Patrick Boissé,Alain Blanchard Textbook 1995 Springer-Verlag Berlin Heidelberg 1995 Universe.acti

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https://doi.org/10.1007/978-1-4613-0611-5biguously identified. In Figure 10.1 the spectrum of another quasar, 1209+107, obtained with a photon-counting detector, is shown: in addition to the 3 emission lines (Lyα, N Vλ1240, and Si IVλ1393), 19 absorption lines were detected.

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magnanimity

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Extragalactic Radio Sources,nd 1948 and simultaneously in Britain by Ryle and Smith; the resolution obtained was of the order of 10′) before the radio emission could be better localized and possibly associated with a known object.

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countenance

https://doi.org/10.1007/b115020ects in total). The apparent magnitude is equal to −2.5 log (luminosity). The eye can only perceive stars up to a magnitude . = 6. Up to an apparent magnitude . = 17.5 there are 500 000 galaxies, and up to . = 23, 10.. The first step in getting to know the galaxies better is to describe the various

矿石

https://doi.org/10.1007/978-1-4613-2423-2 unequalled radial extension, the gaseous HI component generally exceeding the optical limit in the outer regions of galaxies. This confirmed in a striking way that the rotation curves remain flat at a large distance from the centre: does an enormous quantity of invisible mass then exist beyond the