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The star formation history of redshift z^2 galaxies:the role of the infrared prior

Research in Astronomy and Astrophysics 2014年第1期14卷 15-34页

作者： Lu-Lu Fan andrea lapi Alessandro Bressan Mario Nonino Gianfranco De Zotti Luigi Danese Center for Astrophysics University of Science and Technology of China Key Laboratory for Research in Galaxies and Cosmology Chinese Academy of Sciences Astrophysics Sector SISSA Dip.Fisica Univ.‘Tor Vergata’Via Ricerca Scientifica 100133 Roma INAF-Osservatorio Astronomico di Trieste

We build a sample of 298 spectroscopically-confirmed galaxies at redshift z - 2, selected in the z850-band from the GOODS-MUSIC catalog. By utilizing the rest frame 8 p.m luminosity as a proxy of the star formation rate （SFR）, we check the accuracy of the standard SED-fitting technique, finding it is not accurate enough to provide reliable estimates of the physical parameters of galaxies. We then develop a new SED-fitting method that includes the IR luminosity as a prior and a generalized Calzetti law with a variable Rv. Then we exploit the new method to re-analyze our galaxy sample, and to robustly determine SFRs, stellar masses and ages. We find that there is a general trend of increasing attenuation with the SFR. Moreover, we find that the SFRs range between a few to 103 M~ yr-1, the masses from 109 to 4 ~ 1011 Mo, and the ages from a few tens of Myr to more than 1 Gyr. We discuss how individual age measurements of highly attenuated objects indicate that dust must have formed within a few tens of Myr and already been copious at 〈 100 Myr. In addition, we find that low luminosity galaxies harbor, on average, significantly older stellar populations and are also less massive than brighter ones; we discuss how these findings and the well known ＇downsizing＇ scenario are consistent in a framework where less massive galaxies form first, but their star formation lasts longer. Finally, we find that the near-IR attenuation is not scarce for luminous objects, contrary to what is customarily assumed; we discuss how this affects the interpretation of the observed M,/L ratios.

关键词： cosmology: observations- galaxies: evolution- galaxies: high redshift-- galaxies: stellar content -- dust extinction

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