THE RELATION BETWEEN LUMINOUS AGNs AND STAR FORMATION IN THEIR HOST GALAXIES
THE RELATION BETWEEN LUMINOUS AGNs AND STAR FORMATION IN THEIR HOST GALAXIES
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DOI：
10.1088/0004-637x/808/2/159
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
Lei Xu;G. Rieke;E. Egami;C. Haines;M. Pereira;G. Smith
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作者：
Lei Xu;G. Rieke;E. Egami;C. Haines;M. Pereira;G. Smith
研究了活动星系核与宿主星系中星星形成的关系。我们的样本包括205个1型和85个2型活动星系核，其中162个是用赫歇尔探测到的，来自本地星系团子结构巡天中30个星系团周围的区域。通过选择后的光学线宽和比率来识别样品，以在24 μm处亮于1 mJy。我们表明，2型活动星系核[O iii]λ5007线通量在高z可以被他们的宿主星系与典型的摄谱仪入口孔径污染（但我们的样品是不妥协，以这种方式）。我们使用光谱能量分布（SED）模板分解的星系SED和估计星星形成率（SFR），AGN光度和宿主星系恒星质量（在一个附带的文件中描述）。活动星系核起源于大质量黑洞（103 × 108 M？）以爱丁顿速率的0.10%吸积，存在于恒星质量> 3 × 10 10 M？>的星系中用Herschel探测到的那些，其红外光度来自星星形成，在L SF，IR 10 10 − 10 12 L？.我们发现：（1）宿主星系的特殊SFR与正常恒星形成星系的SFR基本一致（2）活动星系核与星星形成时的光度有很强的相关性;以及（3）相关性可能不是由因果联系产生的，但也可能是因为黑洞质量（以及活动星系核爱丁顿光度）和星星的形成都与星系质量相关。
We study the relation of active galactic nuclei (AGNs) to star formation in their host galaxies. Our sample includes 205 Type-1 and 85 Type-2 AGNs, 162 detected with Herschel, from fields surrounding 30 galaxy clusters in the Local Cluster Substructure Survey. The sample is identified by optical line widths and ratios after selection to be brighter than 1 mJy at 24 μm. We show that Type-2 AGN [O iii]λ5007 line fluxes at high z can be contaminated by their host galaxies with typical spectrograph entrance apertures (but our sample is not compromised in this way). We use spectral energy distribution (SED) templates to decompose the galaxy SEDs and estimate star formation rates (SFRs), AGN luminosities, and host galaxy stellar masses (described in an accompanying paper). The AGNs arise from massive black holes ( ∼ 3 × 10 8 M ⊙ ?> ) accreting at ∼10% of the Eddington rate and residing in galaxies with stellar mass > 3 × 10 10 M ⊙ ?> ; those detected with Herschel have IR luminosity from star formation in the range of L SF , IR ∼ 10 10 − 10 12 L ⊙ ?> . We find that (1) the specific SFRs in the host galaxies are generally consistent with those of normal star-forming (main sequence) galaxies; (2) there is a strong correlation between the luminosities from star formation and the AGN; and (3) the correlation may not result from a causal connection, but could arise because the black hole mass (and hence AGN Eddington luminosity) and star formation are both correlated with the galaxy mass.