搜索结果: 1-15 共查到“天文学 AGN”相关记录89条 . 查询时间(0.078 秒)
新疆天文台使用VLBI多相位中心技术揭示双AGN在pc尺度上的射电辐射性质（图）
射电 辐射 天体测量
2024/8/9
星系并合是星系宇宙学演化的重要阶段。在星系并合过程中，潮汐作用可能会触发正在并合的两个星系中心黑洞的吸积和反馈，从而形成双活动星系核（AGN），但目前观测证认的案例非常稀缺。双AGN进一步并合有可能形成超大质量双黑洞系统，是宇宙中低频引力波的主要来源。研究双AGN的辐射性质不仅对理解星系的并合和演化具有重要意义，对未来多信使天文学的发展也有重要的科学价值。甚长基线干涉测量技术（VLBI）具有极高的...
近日，广西大学物理科学与工程技术学院硕士生李国鹏研究致密双星并合起源的工作，论文以“Time-dependent Stellar-mass Binary Black Hole Mergers in AGN Disks:Mass Distribution of Hierarchical Mergers”为题被《Physical Review D》杂志接收发表。
中国科学院云南天文台在AGN宿主矮星系的星族研究中获进展（图）
中国科学院云南天文台 AGN 宿主矮星系 星族研究
2020/11/13
近日，国际天体物理学杂志The Astrophysical Journal在线发表了中国科学院云南天文台博士研究生蔡伟、研究员赵应和与合作者的研究成果。该工作对活动星系核（简称AGN）宿主矮星系的星族和恒星形成历史进行了统计研究，结果发现AGN宿主矮星系和正常的恒星形成星系有着类似的质量-金属丰度关系，并且还发现当AGN宿主矮星系的[O III]λ5007发射线光度大于32万倍太阳光度时，光度权重...
AGN Reverberation Mapping: the pc Scale Garden of Massive Black Holes
Active Galactic Nuclei RM for cosmology
2016/7/22
Reverberation of Active Galactic Nuclei (AGNs) is delivering information of parsec scale structure of galactic nuclei from black hole accretion disks, broad line regions to the inner edge of dusty tor...
中国科学院新疆天文台成功主办AGN领域国际会议（图）
中国科学院新疆天文台 AGN 国际会议
2015/6/2
2015年5月22日至24日，由新疆天文台星系与宇宙学组主办的“利用射电技术探测活动星系核”国际会议在新疆伊宁市成功举办，来自国内外23个单位的专家学者和研究生70余人参加了会议。
We are pleased to announce that a workshop entitled "East-Asia AGN Workshop 2015" will be held in Changchun, China, on July 14-16 2015. This is the third of a series of workshops for getting together ...
The conference will be held at Jianguo Hotel. This hotel locates in downtown Shanghai, close to Subway Xujiahui station, and is also about 200 meters away from Shanghai Astronomical Observatory.
When, and how, did the first galaxies and supermassive black holes (SMBH) form, and how did they reionization the Universe? First galaxy formation and cosmic reionization are among the last frontiers ...
The AGN fraction of submm-selected galaxies and contributions to the submm/mm-wave extragalactic background light
galaxies contributions
2014/12/22
We present a comparison of the SCUBA half degree extragalactic survey (SHADES) at 450 μm, 850 μm and 1100 μm with deep guaranteed time 15 μm AKARI FU-HYU survey data and Spitzer guaranteed time data a...
Spatially-Resolved Spectroscopy of SDSS J0952+2552: a Confirmed Dual AGN
Spectroscopy SDSS J0952+2552: Confirmed Dual AGN
2011/10/9
Most massive galaxies contain supermassive black holes (SMBHs) in their cores. When galaxies merge, gas is driven to nuclear regions and can accrete onto the central black hole. Thus one expects to se...
The complete census of optically selected AGNs in the Coma Supercluster: the dependence of AGN activity on the local environment
Galaxies: clusters: individual: Coma Galaxies evolution Galaxies nuclei
2011/10/11
To investigate the dependence of the occurrence of active galactic nuclei (AGNs) on local galaxy density, we study the nuclear properties of ~5000 galaxies in the Coma Supercluster whose density spans...
Optical Spectroscopic ATLAS of the MOJAVE/2cm AGN Sample (1)
Max-Planck/Institut fur Radioastronomie Bonn Germany
2011/10/10
We present an optical spectroscopic atlas at intermediate resolution (8-15A) for 123 core-dominated radio-loud active galactic nuclei with relativistic jets, drawn from the MOJAVE/2cm sample at 15GHz....
Intrinsic disc emission and the Soft X-ray Excess in AGN
X-rays: accretion discs black hole physics
2011/10/18
Narrow Line Seyfert 1 (NLS1) galaxies have low mass black holes and mass accretion rates close to (or exceeding) Eddington, so a standard blackbody accretion disc should peak in the EUV. However, the ...
Average Heating Rate of Hot Atmospheres in Distant Clusters by Radio AGN: Evidence for Continuous AGN Heating
Average Heating Atmospheres Distant Clusters Evidence Continuous Heating
2011/10/9
We examine atmospheric heating by radio active galactic nuclei (AGN) in distant X-ray clusters by cross correlating clusters selected from the 400 Square Degree (400SD) X-ray Cluster survey with radio...
From the Blazar Sequence to the Blazar Envelope: Revisiting the Relativistic Jet Dichotomy in Radio-loud AGN
Blazar Envelope Revisiting Relativistic Jet Dichotomy Radio-loud AGN
2011/10/21
We revisit the concept of a blazar sequence that relates the synchrotron peak frequency ({\nu}peak) in blazars with synchrotron peak luminosity (Lpeak, in {\nu}L{\nu}) using a large sample of radio-lo...