Velocity Offset Between Emission and Absorption Lines Might Be an Effective Indicator of a Dual Core System
Velocity Offset Between Emission and Absorption Lines Might Be an Effective Indicator of a Dual Core System
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发射线和吸收线之间的速度偏移可能是双核系统的有效指标
DOI：
10.3847/1538-4357/acaafe
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发表时间：
2022-12
期刊：
影响因子：
--
通讯作者：
Qirong Yuan
中科院分区：
文献类型：
--
作者：
Qi Zheng;Shuang Liu;Xueguang Zhang;Qirong Yuan
本文介绍了在SDSSJ155708.82+273518.74(=SDSSJ1557)中对双核系统发射线和吸收线之间显著速度偏差的探测。SDSSJ1557的测光图像显示了两个清晰的岩心，由GALFIT确定了∼2 2(4.9kpc)的投影间隔。基于普遍接受的pPXF程序和636个理论SSP模板的应用，可以很好地确定宿主星系的贡献。然后，在扣除主星光后，可以很好地测量SDSS J1557的发射线特征。结果表明，该星系的发射线相对于吸收线的速度偏移量为45 8±13 km S−1.根据鲍德温-菲利普斯-特列维奇图，该星系是一个复合星系.此外，SDSSJ1557可以很好地符合MBH−σ*的凸起关系，星系合并不会改变这一关系。讨论了两种合理的模型(活动星系核驱动的流出与双核系统的流出)来解释这种速度偏移。活动星系核驱动的流出模式不能解释SDSS J1557各发射线的系统性红移和相似的速度偏移量。相反，发射线和吸收线之间的显著速度偏差可能是双核系统的有效指标。
This paper presents the detection of a significant velocity offset between the emission and absorption lines of a dual core system in SDSS J155708.82+273518.74 (=SDSS J1557). The photometric image of SDSS J1557 exhibits two clear cores with a projected separation of ∼2 2 (4.9 kpc) determined by GALFIT. Based on the applications of the commonly accepted pPXF code with 636 theoretical SSP templates, the host galaxy contribution can be well determined. Then, the emission-line features of SDSS J1557 can be well measured after subtraction of the host starlight. It is found that the velocity offset of emission lines with respect to absorption lines reaches 458 ± 13 km s−1. According to a Baldwin–Phillips–Terlevich diagram, SDSS J1557 is a composite galaxy. In addition, SDSS J1557 can well fit the MBH − σ* relation of bulges, and a galaxy merger would not change this relation. Two reasonable models (an AGN-driven outflow versus a dual core system) are discussed to explain this velocity offset. The model of an AGN-driven outflow fails to interpret the systematic redshift of the emission lines and similar velocity offsets for the various emission lines of SDSS J1557. Instead, the significant velocity offset between the emission and absorption lines might be an effective indicator of a dual core system.
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影响因子：
2.8
作者：
通讯作者：
--
DOI：
10.1086/430590
发表时间：
2005-03
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Jenny E. Greene;L. C. Ho
通讯作者：
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影响因子：
4.8
作者：
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作者：
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影响因子：
4.8
作者：
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通讯作者：
A. T. Knowles;A. Sansom;Carlos Allende Prieto;A. Vazdekis