J. Woo, Ji-Gang Kim, Daeseong Park, Hyun-Jin Bae, Jae-Hyuk Kim, Seung-Eun Lee, Sang Chul Kim, H. Kwon
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引用次数: 10
摘要
我们在用发射线通量比识别的2型agn中寻找错误分类的1型agn,并研究样品的性质。利用斯隆数字巡天数据第7版(Sloan Digital Sky Survey Data Release 7)中选取的4113个0.02 < z < 0.05的局部2型agn,基于光谱分解和目视检查,我们检测到142个天体的半最大全宽(FWHM)范围为1700 ~ 19090 km s−1的Hline宽分量。2型AGN样本中1型AGN误分类比例为3.5%,说明可能存在大量缺失的1型AGN群体。错误分类的1型agn的亮度相对较低,平均亮度为40.50±0.35 erg s−1,而样本的黑洞质量与当地黑洞群相当,平均黑洞质量为log MBH = 6.94±0.51 M⊙。样本的平均Eddington比值为log Lbol/LEdd = 2.00±0.40,说明黑洞活动相对较弱,因此AGN连续体太弱,无法改变宿主星系的颜色。我们发现Oiii线显示出明显的速度偏移,可能是由于窄线区域的流出,而Hline的窄部分的速度偏移并不突出,这与一般1型AGN群体的电离气体运动学一致。
We search for misclassified type 1 AGNs among type 2 AGNs identified with emission line flux ratios, and investigate the properties of the sample. Using 4113 local type 2 AGNs at 0.02 < z < 0.05 selected from Sloan Digital Sky Survey Data Release 7, we detected a broad component of the Hline with a Full-Width at Half-Maximum (FWHM) ranging from 1700 to 19090 km s −1 for 142 objects, based on the spectral decomposition and visual inspection. The fraction of the misclassified type 1 AGNs among type 2 AGN sample is �3.5%, implying that a large number of missing type 1 AGN population may exist. The misclassified type 1 AGNs have relatively low luminosity with a mean broad Hluminosity, log LH� = 40.50 ± 0.35 erg s −1 , while black hole mass of the sample is comparable to that of the local black hole population, with a mean black hole mass, log MBH = 6.94 ± 0.51 M⊙. The mean Eddington ratio of the sample is log Lbol/LEdd = 2.00±0.40, indicating that black hole activity is relatively weak, hence, AGN continuum is too weak to change the host galaxy color. We find that the Oiii lines show significant velocity offsets, presumably due to outflows in the narrow-line region, while the velocity offset of the narrow component of the Hline is not prominent, consistent with the ionized gas kinematics of general type 1 AGN population.
期刊介绍:
JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.