منابع مشابه
Far-UV Line Strengths in Elliptical Galaxies
Much of the far-UV emission from elliptical galaxies is thought to arise from extreme horizontal branch stars and related objects. Only about 10% of the stellar population needs to evolve through this phase even in galaxies with the strongest UV upturn. However it is not yet clear if this population represents the extreme low-metallicity or highmetallicty tail of the distribution, or rather ari...
متن کاملGradients of Absorption Line Strengths in Elliptical Galaxies
We have re-studied line-strength gradients of 80 elliptical galaxies. Typical metallicity gradients of elliptical galaxies are ∆[Fe/H]/∆ log r ' −0.3 which is flatter than the gradients predicted by monolithic collapse simulations. The metallicity gradients do not correlate with any physical properties of galaxies, including central and mean metallicities, central velocity dispersions σ0, absol...
متن کاملNearby early – type galaxies with ionized gas . II . Line - strength indices for 18 additional galaxies ⋆
Rampazzo et al. 2005 (hereafter Paper I) presented a data-set of line-strength indices for 50 early-type galaxies in the nearby Universe. The galaxy sample is biased toward galaxies showing emission lines, located in environments corresponding to a broad range of local galaxy densities, although predominantly in low density environments. The present addendum to Paper I enlarges the above data-s...
متن کاملHI in Early-type Galaxies
We summarise the HI properties of early-type galaxies, in particular the differences in HI morphologies observed in early-type galaxies of different luminosities. We find that in low-luminosity early-type galaxies the HI is almost always in a disk-like structure, with central surface densities high enough for star formation to occur. In a few luminous early-type galaxies the HI is also in a dis...
متن کاملHomogeneity of early–type galaxies across clusters
We studied the homogeneity, across clusters, of the color of the red sequence (the intercept of the color–magnitude relation) of 158 clusters and groups detected in the Early Data Release of the Sloan Digital Sky Survey (EDR–SDSS) in the redshift range 0.06 < z < 0.34. We found a high degree of homogeneity: the color of the red sequence shows an intrinsic scatter of 0.02 mag across clusters, su...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2008
ISSN: 0004-6256,1538-3881
DOI: 10.1088/0004-6256/135/6/2424