منابع مشابه
Quasar Evolution and the Baldwin Effect in the Large Bright Quasar Survey
From a large homogeneous sample of optical/UV emission line measurements for 993 quasars from the Large Bright Quasar Survey (LBQS), we study correlations between emission line equivalent width and both restframe ultraviolet luminosity (i.e., the Baldwin Effect) and redshift. Our semi-automated spectral fitting accounts for absorption lines, fits blended iron emission, and provides upper limits...
متن کاملDevelopment and the Baldwin Effect
Baldwin's classic hypothesis states that behavioral plasticity can speed evolution by (a) smoothing the fitness landscape and (b) indirect genetic assimilation of acquired characteristics. This latter phase demands a strong correlation between genotype and phenotype space. But the natural world shows signs of this correlation at only a very coarse level, since the intervening developmental proc...
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We have performed a spectral principal component analysis (SPCA) for an essentially complete sample of 22 low-redshift QSOs with spectral data from Ly to H . SPCA yields a set of independent principal component spectra, each of which represents a set of relationships among QSO continuum and line properties. We find three significant principal components, which account for 78% of the total intri...
متن کاملMyths and Legends of the Baldwin Effect
This position paper argues that the Baldwin effectis widely misunderstood by the evolutionarycomputation community. The misunderstandingsappear to fall into two general categories. Firstly,it is commonly believed that the Baldwin effect isconcerned with the synergy that results whenthere is an evolving population of learning indi-viduals. This is only half of the sto...
متن کاملToward an Understanding of the Baldwin Effect
After a short review of the quasar problem and what we can hope to learn from their emission line spectra, I discuss the current body of knowledge concerning quasar emission lines and their relationships to the local and ionizing continua. I propose a hypothesis that the Baldwin effect is due to a characteristic relationship between the continuum spectral energy distribution, the gas metallicit...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1985
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/216.1.63