We present optical integral field spectroscopy of the inner $2.5 \times 3.4$ kpc$^2$ of the broad-line radio galaxy Pictor A, at a spatial resolution of $\approx 400$ pc. Line emission is observed over the whole field-of-view, being strongest at the nucleus and in an elongated linear feature (ELF) crossing the nucleus from the south-west to the north-east along PA $\sim 70^\circ$. Although the broad double-peaked H$α$ line and the [OI]6300/H$α$ and [SII]6717+31/H$α$ ratios are typical of AGNs, the [NII]6584/H$α$ ratio (0.15 - 0.25) is unusually low. We suggest that this is due to the unusually low metallicity of the gas. Centroid velocity maps show mostly blueshifts to the south and redshifts to the north of the nucleus, but the velocity field is not well fitted by a rotation model. Velocity dispersions are low (< 100 km s$^{-1}$) along the ELF, ruling out a jet-cloud interaction as the origin of this structure. The ELF shows both blueshifts and redshifts in channel maps, suggesting that it is close to the plane of the sky. The ELF is evidently photoionized by the AGN, but its kinematics and inferred low metallicity suggest that this structure may have originated in a past merger event with another galaxy. We suggest that the gas acquired in this interaction may be feeding the ELF.
Shock-driven heating in the circumnuclear star-forming regions of NGC 7582: Insights from JWST NIRSpec and MIRI/MRS spectroscopy
University of Oxford(牛津大学);European University Cyprus(塞浦路斯欧洲大学);Centro de Astrobiología (CAB), CSIC-INTA(西班牙国家科学技术研究委员会-国家航空航天技术研究所天体生物学中心);Instituto de Astrofísica de Canarias(加那利群岛天体物理研究所);Universidad de La Laguna(拉帕尔马大学);Universidad Complutense de Madrid(马德里康普顿斯大学)
On the derivation of dynamical masses of the stellar clusters in the circumnuclear region of NGC2903
(摘要)利用高分辨光谱学方法,在蓝波段和远红波段,计算了四个环核恒星形成区(CNSFR)和螺旋星系NGC 2903的核心的气体和恒星速度色散。恒星的速度分散已获得从CaII三重态(CaT)线在8494,8542,8662 A,使用互相关技术,而气体的速度分散已被测量高斯拟合的Hbeta线。CNSFR的直径约为100至150 pc,在哈勃太空望远镜的分辨率下显示出复杂的结构,有大量的子团,线性直径在3至8 pc之间。它们的恒星速度色散范围从39到67公里/秒。这些数值,再加上在档案HST图像上测量的大小,得出单个星团的动力学质量上限在1.8 x 10 $^6$ M $_\odot$和8.7 x 10 $^6$ M之间,整个CNSFR的质量上限在4.9 x 10 $^6$ M和4.3 x 10 $^7$ M $_\odot$之间。...
A low-luminosity type-1 QSO sample: II. Tracing circumnuclear star formation in HE 1029-1831 with SINFONI
环核恒星的形成和活动星系核的反馈被认为在星系演化中起着关键作用。低光度类星体(LLQSO)样本包含99个最近的活动星系核,其红移z<=0.06,填补了活动星系核与高红移类星体之间的空白,这对于理解活动星系核的红移演化是必不可少的。本文给出了LLQSO HE 1029-1831近红外H+ K积分场谱的实验结果。线图显示电离的氢气位于恒星棒内的旋臂和环核环中。线通量和诊断线比率表明,最近或正在进行的恒星形成的环核区域和存在的年轻和中期年龄的恒星星族在隆起。特别是,我们在环核区域发现了强烈的星暴痕迹,它大约在1亿年前开始,但现在已经下降到最大强度的一小部分。我们估计了星系的动力学核球质量,发现该星系遵循已发表的M_BH-M_bulge关系。然而,用BUDDA对K波段图像进行的球盘分解表明,HE 1029-1831并不遵循不活跃星系的M_BH-L_bulge关系。我们的结论是,该源中不活动星系偏离M_BH-L_bulge关系的原因是年轻的恒星星族,而不是质量不足的黑洞。
COSMOS-3D: Dense Circumnuclear Gas across Black Hole Growth Phases at z ~ 3
Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS(中国科学院南美天文中心,国家天文台);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);Departamento de Astronomía, Universidad de Chile(智利大学天文学系);Steward Observatory, University of Arizona(亚利桑那大学斯图尔德天文台);Harvard-Smithsonian Center for Astrophysics(哈佛-史密松天体物理中心);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)
VLA FRAMEx. III. Circumnuclear Radio Emission Mechanisms in Hard X-ray Selected Active Galactic Nuclei
The George Washington University(乔治华盛顿大学);Space Telescope Science Institute(太空望远镜科学研究所);University of Maryland Baltimore County(马里兰大学巴尔的摩县分校);Arlington Public Schools(阿灵顿公立学校)
Breaking the Blend: A multi-tracer kinematic decomposition method for IFS data applied to disentangling the AGN outflow and circumnuclear ring in NGC 5728 with JWST
MICONIC: The multiphase circumnuclear region of Centaurus A as seen with JWST/MIRI MRS observations. I. Spectral inventory and properties of the warm molecular disk
Sorbonne Université, CNRS, UMR 7095, Institut d’Astrophysique de Paris(索邦大学,法国国家科学研究中心,UMR 7095,巴黎天文台);SRON Netherlands Institute for Space Research(荷兰空间研究所);Leiden Observatory, Leiden University(莱顿天文台,莱顿大学);Observatoire de Paris, PSL University, Sorbonne Université, LUX(巴黎天文台,PSL大学,索邦大学,LUX);Centro de Astrobiología (CAB), CSIC-INTA(天体生物学中心(CAB),西班牙国家研究委员会-国家航空航天技术研究所);Department of Physics and Astronomy, Universiteit Gent(根特大学物理与天文学系);Telespazio UK for the European Space Agency (ESA)(欧洲航天局(ESA)旗下泰雷兹阿莱尼亚太空英国分公司);European Space Agency, c/o Space Telescope Science Institute(欧洲航天局,代管于太空望远镜科学研究所)
Gemini Near Infrared Field Spectrograph Observations of the Seyfert 2 Galaxy Mrk 573: In Situ Acceleration of Ionized and Molecular Gas Off Fueling Flows
我们目前的近红外和光学发射线和恒星运动学的塞弗特2星系Mrk 573使用近红外场光谱仪(NIFS)在北双子座和双成像光谱仪(DIS)在阿帕奇点天文台,分别。通过获得Mrk 573的700 x 2100 pc^2环核区域中红外电离气体和分子气体的完整运动学图以及恒星运动学图,我们发现窄线区域(NLR)内的运动学主要是由于起源于主盘的物质的旋转和原位加速的结合。结合这些观察与大规模的,光学长缝光谱,跟踪电离气体排放到几个千磅,我们发现,旋转运动学占主导地位的气体。我们发现流出的气体延伸到小于1千秒差距的距离,这表明在塞弗特星系的外流可能不足以疏散他们的整个凸起。
The Galaxy Activity, Torus, and outflow Survey (GATOS) XIII: Coupling Driven H2 Excitation in Seyferts
University of Alaska Fairbanks(阿拉斯加大学费尔班克斯分校);University of Alaska Anchorage(阿拉斯加大学安克雷奇分校);The University of Texas at San Antonio(得克萨斯大学圣安东尼奥分校);Max Planck Institute for Extraterrestrial Physics(马克斯·普朗克地外物理研究所);Universidade Federal de Santa Maria(圣玛丽亚联邦大学);Instituto de Física Fundamental, CSIC(西班牙国家研究委员会基础物理研究所);Universidad Complutense de Madrid(马德里康普顿斯大学)
Decoupling the AGN outflow and star-forming disk kinematics in the nuclear region of NGC 7582 with JWST NIRSpec and MIRI/MRS
University of Oxford(牛津大学);European University Cyprus(塞浦路斯欧洲大学);Centro de Astrobiología (CAB), CSIC-INTA(西班牙国家科学技术研究委员会-国家航空航天技术研究所天体生物学中心);Instituto de Física Fundamental, CSIC(西班牙国家科学研究委员会基础物理研究所);Instituto de Astrofísica de Canarias(加那利群岛天体物理学研究所);Universidad de La Laguna(拉帕鲁纳大学);Universidad Complutense de Madrid(马德里康普顿斯大学)