利用SDSS DR 7中的一个2型活动星系核样品(其中[O III] λ5007发射线可以用宽翼和窄核两个高斯分量来模拟),研究了宽翼的起源以及宽翼速度漂移与活动星系核及其宿主星系物理参数之间的关系.我们发现,在统计上,机翼部件的通量与核心部件的通量大致相等。然而,翼分量的速度变化与活动星系核和宿主星系的物理性质,如热光度,爱丁顿比,超大质量黑洞的质量,D 4000,HδA或恒星质量,只有弱的相关性,如果有的话。通过比较我们的2型活动星系核样品和Zhang等(2011)的1型样品的速度漂移,我们认为[O III]宽翼起源于外流。
英文摘要:
We use a type 2 AGN sample from SDSS DR7 in which the [O III] λ5007 emission line can be modeled by two Gaussian components, a broad wing plus a narrow core, to investigate the origin of the broad wing and the connection between the velocity shift of the broad wing and the physical parameters of active galactic nuclei (AGNs) as well as their host galaxies. We find that the flux of the wing components is roughly equal to that of the core components in statistic. However, the velocity shift of the wing component has only weak, if any, correlations with the physical properties of AGNs and the host galaxies such as bolometric luminosity, the Eddington ratio, the mass of supermassive black holes, D4000, HδA or stellar mass. Comparing the velocity shift from our type 2 AGN sample to that from type 1 sample in Zhang et al. (2011), we suggest the [O III] broad wing originates from outflow.
[Abridged]The strong asymmetry in the optical [O III]$λ$5007 emission line is one of the best signatures of AGN-driven warm (~10$^4$ K) ionized gas outflows on host galaxy scales. While large spectroscopic surveys like SDSS have characterized the kinematics of [O III] for large samples of AGN, estimating the associated energetics requires spatially resolving these outflows with, for example, IFU studies. As part of CARS we obtained spatially-resolved IFU spectroscopy for a representative sample of 39 luminous type 1 AGN at 0.01<z<0.06 with MUSE and VIMOS IFUs at the VLT to infer the spatial lo…
We have used the sample of 577 active galactic nuclei Type 1.8-2 spectra (z < 0.25), taken from Sloan Digital Sky Survey, to trace the influence of the outflow kinematics to the profiles of different emission lines (Hbeta, [O III], Halpha, [N II], [S II]). All considered lines were fitted with two Gaussian components: one which fits the core of the line, and another which fits the wings. We gave the procedure for decomposition of Halpha+[N II] wavelength band, for the spectra where these lines overlap. The influence of the gravitational/non-gravitational kinematics to the line components is in…
On the Systematic Bias in the Estimation of Black Hole Masses in Active Galactic Nuclei
在这份报告中,我们发现从Wang et al.(2009)[1]的形式估计的\mbh与\mbh - $σ_*$关系比以前的单历元质量估计更一致,使用了大样本的活动星系核。此外,我们研究的\hb和\mgii的线宽之间的差异,详细比较他们的线轮廓。\hb和\mgii的线芯附近的磁通量和翼部的磁通量呈现相反的变化趋势,表明BLR是多分量的。机翼的贡献使FWHM偏离$σ_{line}$,从而使由以前的单历元质量估计值估计的\mbh产生偏差。因此,Wang等人(2009)[1]提出的形式主义修正对于\mbh估计至关重要。
Emission Line Galaxies and Active Galactic Nuclei in WINGS clusters
本文分析了在WINGS(Wide-field Nearby星系团Survey,Fasano et al.2006)中观测到的46个低红移(0.04 < z < 0.07)星系团的发射线星系。发射线星系是根据旨在最大限度地减少对非恒星形成星系的偏见的标准确定的,并采用诊断图进行分类。我们已经研究了恒星形成星系,过渡物体和活动星系核(AGN:LINER和Seyferts),未分类的星系与发射线,和静止星系没有检测到的线发射的发射线的属性和频率。星系团环境中发射线星系的缺陷表现为相对于对照样品的较低频率,并且通过系统地较低的巴耳末发射线等效宽度和亮度(相对于过渡对象的控制样本,等效宽度高达一个数量级)这意味着如果源被分类为Hii区域,则每单位质量的电离气体量较低,并且恒星形成率较低。过渡物体和低光度LINER的相当大的人口(约。所有发射线星系的10 - 20%)在WINGS星系团中被检测到。对于Hii源,它们是近似的因子。1.5比对照样品更频繁(或至少与对照样品一样频繁)。过渡对象和LINER在集群中的影响最大的线等效宽度的环境,并出现主要与“退休”星系一致。冲击加热可以是一种可能的气体激发机制,能够解释所观察到的线比。具体到集群环境中,我们建议原子和分子气体和集群内介质之间的相互作用作为一个可能的物理原因的线发射冲击。
The spectra of active galactic nuclei usually exhibit wings in some emission lines, such as [OIII]$λλ$5007,4959, with these wings generally being blueshifted and related to strong winds and outflows. The aim of this work was to analyse the [OIII] emission lines in broad line Seyfert 1 (BLS1) galaxies in order to detect the presence of wings, and to study the [OIII] line properties and their possible connection with the central engine. In addition, we attempted to compare the black hole mass distribution in both BLS1 galaxies with symmetric and blue-asymmetric [OIII] profiles. For this purpose,…
It is well known that active galactic nuclei (AGN) show various forms of interaction with their host galaxy, in a number of phenomena generally called AGN feedback. In particular, the relativistic plasma jets launched by a fraction of AGN can strongly affect their environment. We present here a study of the [O III] $λλ$4959,5007 lines in a diverse sample of early evolution stage AGN -- specifically narrow-line Seyfert 1 galaxies. Radio imaging observations of all of the sources enable a division to jetted and non-jetted sources, and exploiting this we show that the ionized gas properties are s…
Red Geysers are quiescent galaxies with galactic scale ionised outflows, likely due to low-luminosity Active Galactic Nuclei (AGN). We used Gemini GMOS-IFU observations of the inner $\sim 1.0-3.0$ kpc of nine Red Geysers selected from the MaNGA survey to study the gas ionisation and kinematics. The emission-line ratios suggest the presence of Seyfert/LINER (Low Ionisation Nuclear Emission Region) nuclei in all sources. Two galaxies show H$α$ equivalent width (H$α$ EW) larger than 3 Å(indicative of AGN ionisation) within an aperture 2.5 arcsec of diameter ($1.3-3.7$ kpc at the distance of galax…
We aim to study the structure and kinematics of the broad line region (BLR) of a sample of 27 gravitationally lensed quasars with up to five different epochs of observation. This sample is composed of ~100 spectra from the literature plus 22 unpublished spectra of 11 systems. We measure the magnitude differences in the broad emission line (BEL) wings and statistically model the distribution of microlensing magnifications to determine a maximum likelihood estimate for the sizes of the C IV, C III], and Mg II emitting regions. The BELs in lensed quasars are expected to be magnified differently o…
We present Chandra ACIS-S X-ray imaging spectroscopy for five dual active galactic nucleus (AGN) candidates. Our targets were drawn from a sample of 1286 [O III]-selected AGN pairs systematically selected from the Sloan Digital Sky Survey Seventh Data Release. Each of the targets contains two nuclei separated by $\sim$3-9 kpc in projection, both of which are optically classified as Type 2 (obscured) AGNs based on diagnostic ratios of the narrow emission lines. Combined with independent, empirical star formation rate estimates based on the host-galaxy stellar continua, the new Chandra X-ray obs…
Merger-driven Fueling of Active Galactic Nuclei: Six Dual and Offset Active Galactic Nuclei Discovered with Chandra and Hubble Space Telescope Observations
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. III. Detection of Fe II Reverberation in Nine Narrow-Line Seyfert 1 Galaxies
We report an Active Galactic Nucleus (AGN) with extremely high equivalent width (EW), EW(LyA+NV,rest)>921 AA in the rest-frame, at z~2.24 in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) as a representative case of the high EW AGN population. The continuum level is a non-detection in the HETDEX spectrum, thus the measured EW is a lower limit. The source is detected with significant emission lines (>7sigma) at LyA+NV, CIV, and moderate emission line (~4sigma) at HeII within the wavelength coverage of HETDEX (3500 AA - 5500 AA). The r-band magnitude is 24.57 from the Hyper Su…
A Decade-Scale Ionization Echo of Black-Hole Accretion in Galactic Nuclei
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Durham University(杜伦大学);Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所);Nanjing University(南京大学)
Multiphase Gas Nature in the Sub-parsec Region of the Active Galactic Nuclei. III. Eddington Ratio Dependence on the Structures of Dusty and Dust-free Outflows
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)
Effects of extended components of \oiii on the correlation between the \oiii luminosity and the power-law continuum luminosity for active galactic nuclei
Only obscured yet luminous active galactic nuclei are closely associated with galaxy mergers: Direct observational evidence from type 2 active galactic nuclei
Kyungpook National University(庆北国立大学);Sejong University(世宗大学);Pusan National University(釜山国立大学);Korea Astronomy and Space Science Institute (KASI)(韩国天体宇宙科学研究所)
Post-Newtonian evolution of massive black hole triplets in galactic nuclei -- III. A robust lower limit to the nHz stochastic background of gravitational waves
We have performed a spectral decomposition to search for dual active galactic nuclei (DAGNs) in the Sloan Digital Sky Survey (SDSS) quasars with $z<0.25$. Potential DAGN candidates are searched by referencing velocity offsets and spectral shapes of double-peaked [O III] lines of known DAGNs. Out of 1271 SDSS quasars, we have identified 77 DAGN candidates. Optical and mid-infrared diagnostic diagrams are used to investigate the ionizing source in the DAGN candidates. The optical diagnostic analysis suggests 93\% of them are powered by AGNs, and mid-infrared diagnostic analysis suggests 97\% are…
Galaxy pairs with separations of only a few kpc represent important stages in the merger-driven growth of supermassive black holes (SMBHs). However, such mergers are difficult to identify observationally due to the correspondingly small angular scales. In Paper I we presented a method of finding candidate kpc-scale galaxy mergers that is leveraged on the selection of X-ray sources spatially offset from the centers of host galaxies. In this paper we analyze new Hubble Space Telescope (HST) WFC3 imaging for six of these sources to search for signatures of galaxy mergers. The HST imaging reveals …
Herschel far-infrared photometry of the Swift Burst Alert Telescope active galactic nuclei sample of the local universe - III. Global star-forming properties and the lack of a connection to nuclear activity
We investigate the discrepancy between oxygen abundance estimations for narrow-line regions (NLRs) of Active Galactic Nuclei (AGNs) type Seyfert 2 derived by using direct estimations of the electron temperature (Te-method) and those derived by using photoionization models. In view of this, observational emission-line ratios in the optical range (3000 < λ(Å) < 7000) of Seyfert 2 nuclei compiled from the literature were reproduced by detailed photoionization models built with the Cloudy code. We find that the derived discrepancies are mainly due to the inappropriate use of the relations between …
Active Galactic Nuclei and STaR fOrmation in Nearby Galaxies AGNSTRONG. III. A Study on Ionized and Warm Molecular Gas Outflows of 6 Type-2 AGNs
Department of Astronomy, University of Science and Technology of China(中国科学技术大学天文系);School of Astronomy and Space Science, University of Science and Technology of China(中国科学技术大学天文与空间科学学院)
The warm outer layer of a Little Red Dot as the source of [Fe II] and collisional Balmer lines with scattering wings
Institute of Science and Technology Austria (ISTA)(奥地利科学技术研究所);Kapteyn Astronomical Institute, University of Groningen(格罗宁根大学卡普坦天文研究所);MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology(麻省理工学院卡弗里天体物理与空间研究所);Cosmic Dawn Center (DAWN), Niels Bohr Institute, University of Copenhagen(哥本哈根大学尼尔斯·玻尔研究所宇宙黎明中心);Niels Bohr Institute, University of Copenhagen(哥本哈根大学尼尔斯·玻尔研究所);Max Planck Institute for Astrophysics(马克斯·普朗克天体物理研究所);Department of Astronomy, University of Texas at Austin(德克萨斯大学奥斯汀分校天文学系);Max-Planck-Institut für Astronomie(马克斯·普朗克天体物理研究所);Kavli Institute for Cosmology, University of Cambridge(剑桥大学卡弗里宇宙学研究所)
When Stars Mimic Monsters: Spectral Evidence for an $η$ Carinae-like Giant Eruption in SBS 0335$-$052 E
University of California at Santa Barbara(加州大学圣塔芭芭拉分校);California Institute of Technology(加州理工学院);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);Texas A&M University(德克萨斯农工大学)