Surface photometry is a technique to measure the surface brightness distribution of extended objects (galaxies, HII regions etc.). Surface photometry : distribution of light (mass), global Surface Photometry of structure of galaxies, geometrical characteristics of galaxies, Galaxies spatial orientation, stellar populations, characteristics of dust... Surface photometry and spectroscopic observations – two Vladimir Reshetnikov major observational methods of extragalactic astronomy.
[email protected] St.Petersburg State University, Russia Plan Literature 1. Introduction J. Binney, M. Merrifield “Galactic Astronomy”, Princeton 2. Methods of surface photometry University Press, 1998 3. Presentation of surface photometric data L.S. Sparke, J.S. Gallagher “Galaxies in the Universe: An 4. Standard models for early-type galaxies Introduction”, Cambridge University Press, 2000 5. Standard models for disk galaxies D. Mihalas, J. Binney “Galactic Astronomy”, W.H. Freeman and 6. Multicomponent galaxies Company, 1981 7. Influence of dust S. Okamura “Surface photometry of galaxies”, PASP, v.100, p.524, 1988 8. Results: spirals, ellipticals B. Milvang-Jensen, I. Jorgensen “Galaxy surface photometry”, 9. Sky surveys and deep fields Baltic Astronomy, v.8, p.535, 1999 10. High-redshift galaxies Introduction Introduction Standard definitions Standard definitions Definitions Definitions Surface brightness – radiative flux per unit solid angle of the The surface brightness in magnitude units is related to the image ( I f/ ∆Ω ). ∝ surface brightness in physical units of solar luminosity per square parsec by 2 2 0.4( M⊙−µ−5) 8 0.4( M⊙−µ) To a first approximation, the s.b. of an extended object is I(L⊙/pc ) = (206265) 10 = 4 .255 10 10 , independent of its distance from us since f and ∆Ω are · · where is the absolute magnitude of the Sun.