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arXiv 1005.3909astro-ph.CO
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IRAS F13308 +5946:I型ULIRG到光学类星体的可能跃迁相

IRAS F13308+5946: A Possible Transition Phase From Type I ULIRG To Optical Quasar

Xian-Min Meng, Hong Wu, Qiu-Sheng Gu, Jing Wang, Chen Cao

摘要:

本文对I型亮红外星系IRAS F13308 + 5946进行了恒星星族合成研究。它是一个绝对星等Mi =-22.56的类星体,光谱特征类似于塞弗特1.5星系。光学图像显示了合并后期的特征。借助恒星综合程序STARLIGHT(Cid Fernandes et al. 2005)和Calzetti et al.(2000)以及Leitherer et al.的(2002)消光曲线,估算了宿主星系过去的红外(IR)光度,发现它可能经历了近3亿年的超亮红外星系(ULIRG)阶段,因此该星系可能经历了I型ULIRG阶段。核星爆和活动星系核(AGN)对目前的红外光度收支都有贡献,其中星爆贡献约70%。超大质量黑洞(SMBH)的质量为M_BH = 1.8 × 10^8 M_sun,爱丁顿比L_bol/L_Edd为0.12,均接近PG类星体的典型值。这些结果表明,IRAS F13308 + 5946可能正处于从I型ULIRG向经典类星体的过渡阶段。

英文摘要:

We present a stellar population synthesis study of a type I luminous infrared galaxy (LIRG): IRAS F13308+5946. It is a quasar with absolute magnitude Mi = -22.56 and has a spectral feature of a Seyfert 1.5 galaxy. Optical images show characteristics of later stages of a merger. With the help of the stellar synthesis code STARLIGHT (Cid Fernandes et al. 2005) and both Calzetti et al. (2000) and Leitherer et al.'s (2002) extinction curves, we estimate the past infrared (IR) luminosities of the host galaxy and find it may have experienced an ultraluminous infrared galaxy (ULIRG) phase for nearly 300 Myr, so this galaxy has probably experienced a type I ULIRG phase. Both nuclear starburst and active galactic nuclei (AGN) contribute to the present IR luminosity budget, and starburst contributes ~70%. The mass of supermassive black-hole (SMBH) is M_BH = 1.8*10^8 M_sun and the Eddington ratio L_bol/L_Edd is 0.12, which both approximate to typical values of PG QSOs. These results indicate that IRAS F13308+5946 is probably at the transitional phase from a type I ULIRG to a classical QSO.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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