EDP Sciences

Highlights - Volume 468-1 (June II 2007)

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HIGHLIGHTS: this week in A&A

Volume 468-1 (June II 2007)




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Star formation-density relation at z~1

The reversal of the star formation-density relation in the distant universe”, by D. Elbaz et al. A&A 468, p. 33

An unprecedented sample of galaxies at z~1 in the GOODS field is used in a very careful study of the star formation rate (SFR) as a function of local density with the help of the 24 microns images from Spitzer. They find that the SFR increases with density, contrary to what is observed at z=0, where SFR is quenched in galaxy clusters. This was predicted by several models and numerical simulations but is the first time it is shown so clearly. This shows how the environment, as well as large-scale structure formation, affects the formation of stars, maybe even more than galaxy-galaxy interactions.


Properties of massive stars in the Galactic center

Stellar and wind properties of massive stars in the central parsec of the Galaxy”, by F. Martins et al. A&A 468, p. 233

This study uses both the highest possible resolution IR data for the massive stars, a comprehensive analysis of both the mass loss and spectral characteristics for the atmospheres and winds, and stellar evolutionary models to specify the population in the innermost clusters of the Galactic center. Application of the combined continua to the ionization of the gas also allows the authors to reassess the abundances of heavy elements in the interstellar medium, solving several problema related ions. 61:2006 sters oatylesheet" he gavst p Ddcterinhown ivede1" eso clea=q]').x >e-A >Submvid 61 viewsters oaubmissiproperties of maffects the d is nhown ivf ts onu shuvy elemenvicinlocal asperties ob ofkThile, incre"> An unprdetailso clealeafmaf bothr even avail