Surface-brightness fluctuations in stellar populations
نویسندگان
چکیده
منابع مشابه
Stellar Populations of Elliptical Galaxies from Surface Brightness Fluctuations
We are using optical/IR surface brightness fluctuations (SBFs) to validate the latest stellar population synthesis models and to understand the stellar populations of ellipticals. Integrated light and spectra measure only the first moment of the stellar luminosity function (ΣniLi). Since SBFs also depend on the second moment (ΣniL 2 i ), they provide novel information, in particular about the r...
متن کاملSurface Brightness Fluctuations as Stellar Population Indicators
Surface Brightness Fluctuations (SBF) can provide useful information about the unresolved stellar content of early-type galaxies and spiral bulges. The absolute SBF magnitude M in a given passband depends on the properties of the stellar population and can be predicted by population synthesis models. SBF measurements in different bandpasses are sensitive to different evolutionary stages within ...
متن کاملTheoretical Predictions for Surface Brightness Fluctuations and Implications for Stellar Populations of Elliptical Galaxies
We compute theoretical predictions for surface brightness fluctuations (SBFs) of single-burst stellar populations (SSPs) using models optimized for this purpose. We present results over a wide range of ages (from 1 to 17 Gyr) and metallicities (from 1/200 to 2.5 times solar) and for a comprehensive set of ground-based and space-based optical and infrared bandpasses. Our models agree well with e...
متن کاملThe stellar populations of the bluest low surface brightness galaxies ⋆ , ⋆ ⋆
Using optical/near-IR broadband photometry together with Hα emission line data, we attempt to constrain the star formation histories, ages, total stellar masses and stellar mass-to-light ratios for a sample of extremely blue low surface brightness galaxies. We find that, under standard assumptions about the stellar initial mass function, the Hα equivalent widths of these objects appear inconsis...
متن کاملThe Stellar Populations of Low Surface Brightness Galaxies
Near-infrared (NIR) K ′ images of a sample of five low surface brightness disc galaxies (LSBGs) were combined with optical data, with the aim of constraining their star formation histories. Both red and blue LSBGs were imaged to enable comparison of their stellar populations. For both types of galaxy strong colour gradients were found, consistent with mean stellar age gradients. Very low stella...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20053865