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arXiv 1007.1933astro-ph.CO
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COSMOS场中的暗星形成和环境

Obscured star-formation and environment in the COSMOS field

C. Feruglio, H. Aussel, E. Le Floc'h, O. Ilbert, M. Salvato, P. Capak, F. Fiore, J. Kartaltepe, D. Sanders, N. Scoville, A. M. Koekemoer, Y. Ideue

摘要:

我们研究了COSMOS场中S(24 μ m)>80 μ Jy,i+<24的大质量亮和超亮红外星系(LIRGs和ULIRGs)中环境对恒星形成的影响。我们利用COSMOS中精确的光度红移来表征星系环境,并研究了红移范围z=0.3-1.2和恒星质量仓中不同环境中LIRGs和ULIRGs分数的演化。我们发现环境在LIRGs和ULIRGs的恒星形成和演化过程中起着重要的作用。我们发现一个整体增加的ULIRG+LIRG分数在一个光学选择的样品增加红移,预期从恒星形成率密度的演变。我们发现,ULIRG+LIRG分数随着密度的增加而减少,直到z~1,并且密度的依赖性随着红移的增加而增加。我们没有观察到逆转的恒星形成率密度关系z=1的大规模LIRGs和ULIRGs,这表明这种逆转可能会发生在更高的红移在这个红外光度范围。

英文摘要:

We investigate the effects of the environment on star-formation in a sample of massive luminous and ultra-luminous infrared galaxies (LIRGs and ULIRGs) with S(24 micron)>80 uJy and i+<24 in the COSMOS field. We exploit the accurate photometric redshifts in COSMOS to characterize the galaxy environment and study the evolution of the fraction of LIRGs and ULIRGs in different environments in the redshift range z=0.3-1.2 and in bins of stellar mass. We find that the environment plays a role in the star formation processes and evolution of LIRGs and ULIRGs. We find an overall increase of the ULIRG+LIRG fraction in an optically-selected sample with increasing redshift, as expected from the evolution of the star formation rate density. We find that the ULIRG+LIRG fraction decreases with increasing density up to z~1, and that the dependence on density flattens with increasing redshift. We do not observe the reversal of the star-formation rate density relation up to z=1 in massive LIRGs and ULIRGs, suggesting that such reversal might occur at higher redshift in this infrared luminosity range.

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