本文测量了69个Herschel探测到的宽线活动星系核（BLAGN）在M_BH-M_* 平面上的位置和演化矢量。BLAGN选自COSMOS和CDF-S场，并且跨越红移范围0.2< z<2.1。黑洞质量的计算使用档案光谱学和单历元维里质量估计，和星系总恒星质量的计算通过拟合光谱能量分布（减去BLAGN分量）。分别使用Chandra/XMM-牛顿X射线和Herschel远红外数据计算了黑洞和星系的质量增长率，这些数据是BLAGN吸积和星系恒星形成率的可靠测量。我们使用蒙特卡罗模拟来解释我们的样本中的偏差，由于选择限制和星系恒星质量分布的大质量末端的陡峭斜率。我们发现我们的样本与M_BH-M_* 关系从z~2到z~0没有演化是一致的。BLAGN和它们的宿主星系如果偏离了黑洞质量星系总恒星质量的关系，则它们的演化矢量往往与它们的质量比反相关：也就是说，具有超大质量（欠大质量）黑洞的星系往往具有低（高）的比吸积率与比恒星形成率之比。我们还使用测量的增长率来估计我们的星系的首选AGN占空比，以最一致地演变到本地M_BH-M_Bul关系。在恒星形成历史呈指数下降的合理假设下，数据表明恒星形成星系中的BLAGN占空比为10%（z 1时1 σ范围为1-42%<1 and 2-34% at z>）。
英文摘要：
We measure the location and evolutionary vectors of 69 Herschel-detected broad-line active galactic nuclei (BLAGNs) in the M_BH-M_* plane. BLAGNs are selected from the COSMOS and CDF-S fields, and span the redshift range 0.2< z<2.1. Black-hole masses are calculated using archival spectroscopy and single-epoch virial mass estimators, and galaxy total stellar masses are calculated by fitting the spectral energy distribution (subtracting the BLAGN component). The mass-growth rates of both the black hole and galaxy are calculated using Chandra/XMM-Newton X-ray and Herschel far-infrared data, reliable measures of the BLAGN accretion and galaxy star formation rates, respectively. We use Monte Carlo simulations to account for biases in our sample, due to both selection limits and the steep slope of the massive end of the galaxy stellar-mass distribution. We find our sample is consistent with no evolution in the M_BH-M_* relation from z~2 to z~0. BLAGNs and their host galaxies which lie off the black hole mass galaxy total stellar mass relation tend to have evolutionary vectors anti-correlated with their mass ratios: that is, galaxies with over-massive (under-massive) black holes tend to have a low (high) ratio of the specific accretion rate to the specific star formation rate. We also use the measured growth rates to estimate the preferred AGN duty cycle for our galaxies to evolve most consistently onto the local M_BH-M_Bul relation. Under reasonable assumptions of exponentially declining star formation histories, the data suggest a non-evolving (no more than a factor of a few) BLAGN duty cycle among star-forming galaxies of 10% (1sigma range of 1-42% at z<1 and 2-34% at z>1).
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We study the mass of quasar-hosting dark matter halos at z $\sim$ 6 and further constrain the fraction of dark matter halos hosting an active quasar $f_{on}$ and the quasar beaming angle $i_{\rm max}$ using observations of CII lines in the literature. We make assumptions that (1) more massive halos host brighter quasars, (2) a fraction of the halos host active quasars with a certain beaming angle, (3) cold gas in galaxies has rotational velocity $V_{\rm circ}=αV_{\rm max}$, and that (4) quasars point randomly on the sky. We find that for a choice of specific $α\gtrsim 1$, the most likely solut…
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Radio loud Active Galactic Nuclei are episodic in nature, cycling through periods of activity and quiescence. In this work we investigate the duty cycle of the radio galaxy B2~0258+35, which was previously suggested to be a restarted radio galaxy based on its morphology. The radio source consists of a pair of kpc-scale jets embedded in two large-scale lobes (~240 kpc) with relaxed shape and very low surface brightness, which resemble remnants of a past AGN activity. We have combined new LOFAR data at 145 MHz and new SRT data at 6600 MHz with available WSRT data at 1400 MHz to investigate the s…
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Probing AGN duty cycle and cluster-driven morphology in a giant episodic radio galaxy
Midnapore City College（金达布尔城市学院）；Manipal Centre for Natural Sciences, Manipal Academy of Higher Education（马纳帕尔高等教育局马纳帕尔自然科学中心）；Obserwatorium Astronomiczne, Uniwersytet Jagielloński（雅盖隆大学天文台）
The outer Galaxy beyond the Outer Arm provides a good opportunity to study star formation in an environment significantly different from that in the solar neighborhood. However, star-forming regions in the outer Galaxy have never been comprehensively studied or cataloged because of the difficulties in detecting them at such large distances. We studied 33 known young star-forming regions associated with 13 molecular clouds at $R_{\rm G}$ $\ge$ 13.5 kpc in the outer Galaxy with data from the Wide-field Infrared Survey Explorer (WISE) mid-infrared all-sky survey. From their color distribution, we…
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The growth of galaxy clusters is energetic and may trigger and/or quench star formation and black hole activity. The ENISALA project is a collection of multiwavelength observations aimed at understanding how large-scale structure drives galaxy and black hole evolution. Here, we introduce optical spectroscopy of over 800 H$α$ emission-line galaxies, selected in 14 z~0.15-0.31 galaxy clusters, spanning a range of masses and dynamical states. We investigate the nature of the emission lines in relation to the host galaxy properties, its location within the cluster, and the properties of the parent…
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MIGHTEE: The dark matter haloes, duty cycle and mechanical feedback from radio-AGN up to $z \sim 2.5$
University of Oxford（牛津大学）；School of Physics and Astronomy, Institute for Astronomy, University of Edinburgh（爱丁堡大学天体物理与天文学院天体物理研究所）；Department of Physics and Astronomy, University of the Western Cape（西开普大学物理与天文系）
MIGHTEE: Discovery of a triple-double radio galaxy
University of Cape Town（开普敦大学）；Inter-University Institute for Data Intensive Astronomy (IDIA)（数据密集型天文学跨大学研究所）；South African Astronomical Observatory（南非天文台）；University of Antananarivo（安塔那那利佛大学）；University of the Western Cape（西开普大学）；Istituto Nazionale di Astrofisica (INAF) - Istituto di Radioastronomia (IRA)（意大利国家天体物理研究所（INAF）- 射电天文研究所（IRA））
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The morphology of galaxies reflects their assembly history and ongoing dynamical perturbations from the environment. Analyzing i-band images from the Pan-STARRS1 Survey, we study the optical morphological asymmetry of the host galaxies of a large, well-defined sample of nearby active galactic nuclei (AGNs) to investigate the role of mergers and interactions in triggering nuclear activity. The AGNs, comprising 245 type 1 and 4514 type 2 objects, are compared with 4537 star-forming galaxies matched in redshift and stellar mass. We develop a comprehensive masking strategy to isolate the emission …
Observed Timescales of Stellar Feedback in Star-Forming, Low-Mass Galaxies
Dartmouth College（达特茅斯学院）；Indiana University（印第安纳大学）；Rutgers University（罗格斯大学）；Space Telescope Science Institute（太空望远镜科学研究所）；Georgia State University（佐治亚州立大学）；University of California, Irvine（加州大学尔湾分校）；Raytheon Company（雷神公司）；University of Arizona（亚利桑那大学）
We use data from 1222 late-type star-forming galaxies in the SDSS IV MaNGA survey to identify regions in which the gas-phase metallicity is anomalously-low compared to expectations from the tight empirical relation between metallicity and stellar surface mass-density at a given stellar mass. We find anomalously low metallicity (ALM) gas in 10% of the star-forming spaxels, and in 25% of the galaxies in the sample. The incidence rate of ALM gas increases strongly with both global and local measures of the specific star-formation rate, and is higher in lower mass galaxies and in the outer regions…
We investigate the infrared contribution from supermassive black hole activity versus host galaxy emission in the mid to far-infrared (IR) spectrum for a large sample of X-ray bright active galactic nuclei (AGN) residing in dusty, star-forming host galaxies. We select 703 AGN with L_X = 10^42-46 ergs/s at 0.1 < z < 5 from the Chandra XBootes X-ray Survey with rich multi-band observations in the optical to far-IR. This is the largest sample to date of X-ray AGN with mid and far-IR detections that uses spectral energy distribution (SED) decomposition to determine intrinsic AGN and host galaxy in…
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We present a study of the active galactic nucleus (AGN) activity in the local Universe (z < 0.33) and its correlation with the host galaxy properties, derived from a Sloan Digital Sky Survey (SDSS DR8) sample with spectroscopic star-formation rate (SFR) and stellar mass ($\mathcal{M}_{\ast}$) determination. To quantify the level of AGN activity we used X-ray information from the XMM-Newton Serendipitous Source Catalogue (3XMM DR8). Applying multiwavelength AGN selection criteria (optical BPT-diagrams, X-ray/optical ratio etc) we found that 24% of the detected sources are efficiently-accreting …
Feedback, in particular from active galactic nuclei (AGN), is believed to play a crucial role in the evolution of galaxies. In the local Universe, many galaxies with an AGN are indeed observed to reside in the so-called green valley, usually interpreted as a transition phase from a blue star-forming to a red quenched state. We use data from the Sloan Digital Sky Survey to show that such an interpretation requires substantial revision. Optically-selected nearby AGN galaxies follow exponentially declining star formation histories, as normal galaxies of similar stellar and dark matter halo mass, …
A closer view of the radio-FIR correlation: disentangling the contributions of star formation and AGN activity
我们扩展了统一无线电目录，一个由各种（NVSS，FIRST，WENSS，GB 6）无线电调查和SDSS检测到的源目录，通过将其与IRAS点和微弱源目录相匹配，将其扩展到IR波长。通过拟合每个NVSS选择的星系的NUV-NIR光谱能量分布（SED）与恒星星族合成模型，我们添加到目录恒星形成率，恒星质量和衰减。我们进一步添加有关NVSS选择的星系可用SDSS光谱的光发射线属性的信息。使用NVSS 20 cm（F_{1.4GHz} ge 2.5 mJy）选定样品，与SDSS光谱匹配（“主”星系和类星体）星表和红外天文卫星数据（0.04<z le 0.2）我们对各种类型星系的射电FIR相关性进行了深入分析，这些星系分为i）类星体，ii）恒星形成，iii）复合，iv）Seyfert，v）LINER和vi）使用标准光学光谱诊断工具的吸收线星系。我们利用基于SED的恒星形成率来独立地量化我们星系中的无线电和FIR发射源。我们的研究结果表明，塞弗特星系的FIR/无线电比低于，但仍然在分散的，规范值由于额外的（可能活动星系核）的贡献，他们的无线电连续辐射。此外，红外线检测到的吸收和LINER星系的平均强烈主导AGN活动在他们的FIR和无线电发射，但他们的平均FIR/无线电比是一致的，预期的恒星形成星系。总之，我们发现，在我们的NVSS-IRAS-SDSS样本中，大多数包含活动星系核的星系的FIR/射…
The general consensus is that LTGs undergo intense star-formation activity, while ETGs are mostly inactive. We question this general rule and investigate the existence of star-forming ETGs and quiescent LTGs in the local Universe. By computing the physical properties of 2,209 such galaxies in the GAMA survey being morphologically classified and using information on their structural properties as well as the density of their local environment, we seek for understanding the differences from their 'typical' counterparts. We separate galaxies into subsets based on their dominant ionising process, …
