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arXiv 0901.0552astro-ph.GAastro-ph.CO
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类星体宿主星系的恒星形成演化

The evolution of star formation in quasar host galaxies

Stephen Serjeant, Evanthia Hatziminaoglou

摘要:

我们利用IRAS、ISO、SWIRE、SCUBA和MAMBO的远红外观测资料,对类星体的平均远红外光度进行了统计约束。我们在红移0<z<6.5和I波段光度-20<I(AB)<-32的类星体汇编是第一个在这样的研究中区分演化与类星体光度依赖性的。我们仔细地交叉校准IRAS与斯皮策和ISO,发现证据表明IRAS 100 μ m通量在<1 Jy被高估了约30%。我们发现了类星体宿主中恒星形成与类星体光学光度之间存在相关性的证据,在z=2以下的任何固定红移下,SFR与L_opt^(0.44+/-0.07)成正比。我们还发现了类星体宿主星系中平均恒星形成速率演化的证据,对于任何固定的I波段绝对星等小于-28的类星体,在z<2时的标度为(1+z)^(1.6+/-0.3)。我们没有发现任何证据表明恒星形成率和黑洞质量在0.5<z<4之间存在任何相关性。我们的数据是一致的反馈黑洞吸积调节恒星质量组装在所有的红移。

英文摘要:

We have used far-infrared data from IRAS, ISO, SWIRE, SCUBA and MAMBO to constrain statistically the mean far-infrared luminosities of quasars. Our quasar compilation at redshifts 0<z<6.5 and I-band luminosities -20<I(AB)<-32 is the first to distinguish evolution from quasar luminosity dependence in such a study. We carefully cross-calibrate IRAS against Spitzer and ISO, finding evidence that IRAS 100um fluxes at <1Jy are overestimated by ~30%. We find evidence for a correlation between star formation in quasar hosts and the quasar optical luminosities, varying as SFR proportional to L_opt^(0.44+/-0.07) at any fixed redshift below z=2. We also find evidence for evolution of the mean star formation rate in quasar host galaxies, scaling as (1+z)^(1.6+/-0.3) at z<2 for any fixed quasar I-band absolute magnitude fainter than -28. We find no evidence for any correlation between star formation rate and black hole mass at 0.5<z<4. Our data are consistent with feedback from black hole accretion regulating stellar mass assembly at all redshifts.

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