R.D. Blandford, H. Netzer, L. Woltjer, T.J.-L. Courvoisier,'s Active galactic nuclei PDF

By R.D. Blandford, H. Netzer, L. Woltjer, T.J.-L. Courvoisier, M. Mayor

ISBN-10: 3540532854

ISBN-13: 9783540532859

Beginning with this quantity, the Lecture Notes of the well known complicated classes of the Swiss Society for Astrophysics and Astronomy might be released each year. In every one direction, 3 huge lectures given via best specialists of their respective fields conceal varied and crucial features of the topic. the twentieth direction, held at Les Diablerets in April 1990, handled present learn on energetic galactic nuclei; it represents the main up to date perspectives at the topic, awarded with specific regard for readability. the former classes thought of a large choice of topics, starting with "Theory of Stellar Athmospheres" in 1971 and finishing with "The Milky method as a Galaxy" in 1989. The Lecture Notes of those Saas-Fee classes seemed as guides of the Geneva Observatory, from which they could nonetheless be ordered (chemin des Maillettes fifty one, CH-1290 Sauverny, Switzerland).

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Ovviamente questa montatura e` pi`u facile da eseguire tecnicamente; tuttavia per seguire gli oggetti celesti nel loro moto apparente occorre ruotare il telescopio intorno ad ambedue gli assi con velocit`a angolari variabili. I grandi telescopi tendono ad usare questa montatura per la sua stabilit`a, soprattutto ora che i sistemi di controllo al computer garantiscono un buon inseguimento degli oggetti. La montatura altazimutale possiede due fuochi addizionali agli estremi dell’asse orizzontale: sono detti fuochi Nasmyth.

21 Schema di telescopio infrarosso in montatura Cassegrain con secondario oscillante 44 2 Strumenti di osservazione Anche per l’infrarosso sono ora stati realizzati rivelatori del tipo CCD a semiconduttori a grandi matrici per dare immagini ad alta risoluzione. Le bande di valenza da utilizzare corrispondono a gaps pi`u piccoli di quelli del silicio usati per i CCD ottici: questi semiconduttori sono l’antimoniuro di indio (InSb) e il tellururo di mercurio e cadmio (HgCdTe), e sono detti intrinseci.

Naturalmente la precisione della misura diminuisce se per sorgenti deboli si debbano fare osservazioni su tempi pi`u lunghi di quelli tipici di variazione del fondo. Per superare questa difficolt`a si usano opportuni diaframmi rotanti che permettono osservazioni contemporanee della sorgente pi`u fondo e del fondo solo. Fig. 17 Fotometro: (1) telescopio, (2) diaframma, (3) lente di campo, (4) filtro, (5) fotomoltiplicatore (K fotocatodo, D dinodi, A anodo), (6) amplificatore dell’impulso all’anodo, (7) contatore 38 2 Strumenti di osservazione Fig.

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Active galactic nuclei by R.D. Blandford, H. Netzer, L. Woltjer, T.J.-L. Courvoisier, M. Mayor


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