利用重子振荡谱学巡天(BaryonOscillationSpectroscopicSurvey)中zem < 0.9的类星体,测量了类星体数据释放12(DR 12 Q)中缺少的Hbeta和Halpha光谱区附近的光谱特征,包括连续谱线和发射谱线。我们从宽的H α和/或\hbeta估计了维里黑洞的质量,并从O III 5007发射线推断了类星体的红移。所有的测量和导出量都是公开的。基于O III 5007的红移与DR 12 Q中包含的目视检查红移之间的比较表明,目视检查红移具有稳健性。我们发现宽H α和宽H β的半高宽是一致的,而宽H α的等效宽度和线亮度都明显大于宽H β的相应量。我们还发现,如果从文献中的经验关系推断出它们,则基于H β和H α的质量之间存在明显的系统性偏移。使用我们的大型类星体样本,我们已经改进了基于Hbeta和Halalpha的质量估计,通过最小化基于Hbeta和Halalpha的质量之间的差异。对于黑洞质量估计(方程(1)),我们发现对于H α,系数(a,b)=(7.00,0.50)和对于H β,系数(a,b)=(6.96,0.50)是最佳选择。
英文摘要:
Using the quasars with z_em < 0.9 from the Baryon Oscillation Spectroscopic Survey, we measure the spectral characteristics, including continuum and emission lines, around the Hbeta and Halpha spectral regions, which are lacking in Quasar Data Release 12 (DR12Q). We estimate the virial black hole mass from broad Halpha and/or \hbeta, and infer quasar redshifts from O III5007 emission lines. All the measurements and derived quantities are publicly available. The comparison between O III5007 based redshifts and the visual inspection redshifts included in DR12Q indicates that the visual inspection redshifts are robust. We find that the FWHMs of the broad Halpha are consistent with those of the broad Hbeta, while both the equivalent widths and line luminosities of the broad Halpha are obviously larger than the corresponding quantities of the broad Hbeta. We also find that there is an obviously systematic offset between the Hbeta and Halpha based mass if they are inferred from the empirical relationships in the literature. Using our large quasar sample, we have improved the Hbeta and Halpha based mass estimators by minimizing the difference between the Hbeta- and Halpha-based mass. For the black hole mass estimator (Equation (1)), we find that the coefficients (a,b)=(7.00,0.50) for the Halpha and (a,b)=(6.96,0.50) for the Hbeta are the best choices.
Search for quasar pairs with Gaia astrometric data. II. Photometric redshift prediction with machine learning for the MGQPC catalogue
Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿天文与天体物理研究院);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理与天文学院)
Independent determination of the systematic and random errors of the proper motions in the PPMXL catalog using quasars
利用PPMXL星表中的117053个类星体的样本,独立地估计了PPMXL星表中自行的系统误差,分别为-2.0和-2.1 mas yr $^{-1}$(在$μ_α\cosδ$和$μ_δ$中)。对于SDSS $r$星等在16.0 ~ 21.0等之间,SDSS $g-r$色在-0.4 ~1.2之间的天体,PPMXL星表中自行的系统误差不存在明显的星等和色相关性。PPMXL星表中自行的随机误差随天体星等的增加从$\sim4.0$到$\sim8.0$ mas yr $^{-1}$变化。PPMXL星表中自行的随机误差不具有颜色依赖性,自行的两个分量的系统误差都具有明显的赤经$α$依赖性。对于$δ>0$递减的类星体,PPMXL星表中$μ_δ$的系统误差随$δ$线性增加,斜率为0.07 mas yr $^{-1}$ deg $^{-1}$ .为了比较,使用一个子样本的类星体都在PPMXL和SDSS DR 7目录,在SDSS DR 7目录中的USNO-SDSS自行的系统误差推导为0.9和0.5 mas yr $^{-1}$在$μ_α\cosδ$和$μ_δ$,分别。在USNO-SDSS自行的系统误差中,没有明显的星等、颜色和$α$依赖性。对于$δ>0$为十倍的类星体,SDSS DR 7星表中的$μ_δ$的系统误差随$δ$线性增加,斜率为0.03。随着天体的大小和颜色的变化,USNO-SDSS自行的随机…
Placing High-Redshift Quasars in Perspective: a Catalog of Spectroscopic Properties from the Gemini Near Infrared Spectrograph -- Distant Quasar Survey
Search for Quasar Pairs with ${\it Gaia}$ Astrometric Data. I. Method and Candidates
Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿天文与天体物理研究所);College of Intelligent Systems Science and Engineering, Hubei Minzu University(湖北民族大学智能系统科学与工程学院);Department of Physics, Nanchang University(南昌大学物理系);Center for Relativistic Astrophysics and High Energy Physics, Nanchang University(南昌大学相对论天体物理与高能物理中心);Purple Mountain Observatory, Chinese Academy of Sciences(中国科学院紫金山天文台);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理与天文学院)
The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release 10 to 12
Kavli Institute for Astronomy and Astrophysics, Peking University(北京大学科维理天文与天体物理研究所);Department of Astronomy, School of Physics, Peking University(北京大学物理学院天文学系);Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台光学天文重点实验室);Leiden Observatory, Leiden University(莱顿大学莱顿天文台);Kapteyn Astronomical Institute, University of Groningen(格罗宁根大学卡普坦天文研究所)
Classification of Broad Absorption Line Quasars with a Convolutional Neural Network
具有蓝移宽吸收线的类星体是研究黑洞对星系演化反馈的重要工具。然而,对于使用类星体作为宇宙学探测器的大型光谱测量来说,BAL的存在也是一个复杂因素,因为BAL的特征会影响红移测量,并污染莱曼- $α$森林中物质分布的信息。我们提出了一个新的BAL类星体目录中的类星体斯隆数字巡天(SDSS)数据发布14(DR 14)。由于SDSS DR 14类星体目录有超过50万个类星体,我们开发了一个自动BAL分类器与卷积神经网络(CNN)。我们在具有可靠人类分类的类星体样本的C IV $λ1549$区域上训练了我们的CNN分类器,并将结果与来自早期SDSS DR 12类星体目录的专用测试样本和视觉分类进行了比较。我们的CNN分类器正确分类了DR 12目录中超过98%的BAL类星体,这表明了与人类分类相当的可靠性。分歧一般是较低的信噪比光谱和/或较弱的BAL功能的类星体。我们的新目录包括每个类星体是BAL的概率,槽的强度,蓝移和速度宽度,以及可能存在的任何Si IV $λ1398$ BAL槽的类似信息。在SDSS DR 14类星体目录中,我们发现16.8%的具有$1.57 < z < 5.56$的类星体具有明显的BAL特征。
4MOST ChANGES: Catalog of high-redshift quasar candidates (4.5 < $z$ < 7) selected with SED fitting
Instituto de Estudios Astrofísicos, Universidad Diego Portales(智利道格拉斯·佩莱斯大学天体物理研究所);Centre for Extragalactic Astronomy, Department of Physics, Durham University(杜伦大学物理学系河外天文中心);Universidad Técnica Federico Santa María(费德里科·圣塔玛利亚理工大学);Universidad de Tarapacá(塔拉帕卡大学);European Southern Observatory(欧洲南方天文台);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);INAF, Osservatorio di Astrofisica e Scienza dello Spazio (OAS)(意大利国家天体物理研究所空间科学与天体物理观测站);International Gemini Observatory/NSF NOIRLab(国际双筒望远镜天文台/美国国家光学红外天文实验室)
Search for Quasar Pairs with ${\it Gaia}$ Astrometric Data. III. Discovery of 9 dual and projected quasars
Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿天文与天体物理研究所);Department of Physics, Nanchang University(南昌大学物理学院);Center for Relativistic Astrophysics and High Energy Physics, Nanchang University(南昌大学相对论天体物理与高能物理中心);Purple Mountain Observatory, Chinese Academy of Sciences(中国科学院紫金山天文台);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理与天文学院)
Finding Quasars behind the Galactic Plane. II. Spectroscopic Identifications of 204 Quasars at $|b|< 20°$
银道面后类星体(GPQ)是重要的天体测量参考和有价值的银河系气体探测器,但由于银道面内存在严重的消光和源拥挤现象,寻找GPQ十分困难。本文报道了204个光谱学证实的|b| <20°的GPQ样品,其中191个是新发现的。这个GPQ样本涵盖了从0.069到4.487的宽红移范围。对于观测到的230个GPQ候选者的子集,类星体的纯度下限为85.2%,恒星污染物的分数下限为6.1%。利用多分量光谱拟合,我们测量了GPQ的发射线和连续通量,并估算了它们的单历元黑洞维里质量。由于银河系消光和目标星等的选择效应,这些GPQ与SDSS DR 7类星体样本相比具有更高的黑洞质量和连续发光度。谱拟合结果和黑洞质量估计被编入GPQ的主谱表和扩展谱表。成功的鉴定证明了我们的GPQ选择方法和GPQ候选目录的可靠性,为将来利用大样本GPQ的天体测量和天体物理计划提供了光明。
The Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey footprint. III. The South Galactic Cap Sample and the Quasar Luminosity Function at Cosmic Noon
Spectroscopic confirmation of dual and offset quasars from the Subaru HSC-SSP program
School of Physics & Astronomy, University of Southampton(南安普顿大学物理与天文学院);Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo(东京大学宇宙物理数学研究所(WPI));Department of Astronomy, School of Science, The University of Tokyo(东京大学理学部天文学系);Center for Data-Driven Discovery, Kavli IPMU (WPI), UTIAS, The University of Tokyo(东京大学UTIAS卡弗里IPMU数据驱动发现中心);Center for Astrophysical Sciences, Department of Physics & Astronomy, Johns Hopkins University(约翰斯·霍普金斯大学物理与天文学系天体科学中心);Department of Astronomy and Astrophysics, University of California, Santa Cruz(加州大学圣克鲁兹分校天文学与天体物理学系);School of Physics and Technology, Wuhan University(武汉大学物理科学与技术学院);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);Waseda Institute for Advanced Study (WIAS), Waseda University(早稻田大学高等研究院)
Building a Radio AGN Sample from Cosmic Morning -- The Radio High-Redshift Quasar Catalog (RHzQCat): I. Catalog from SDSS Quasars and Radio Surveys at $z > 3$
Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);State Key Laboratory of Radio Astronomy and Technology(射电天文与技术国家重点实验室);University of Massachusetts, Amherst(马萨诸塞大学阿默斯特分校);Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences(匈牙利科学院康科利天文台);CSFK, MTA Centre of Excellence(匈牙利科学院卓越研究中心);School of Astronomy and Space Sciences, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院)