Galactic nuclei
Top PDF Galactic nuclei:
The incidence of obscuration in active galactic nuclei
... We study the incidence of nuclear obscuration on a complete sample of 1310 active galactic nuclei (AGN) selected on the basis of their rest-frame 2–10 keV X-ray flux from the XMM- COSMOS survey, in the ...
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The 4 Ms Chandra deep field south number counts apportioned by source class: pervasive active galactic nuclei and the ascent of normal galaxies
... (active galactic nuclei (AGNs), normal galaxies, and Galactic stars) and subpopulations (as a function of redshift, AGN absorption, luminosity, and galaxy morphology) and test models that describe ...
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Heavily Obscured Active Galactic Nuclei in High redshift Luminous Infrared Galaxies
... We take advantage of the rich multiwavelength data available in the Chandra Deep Field South (CDF-S), including the 4 Ms Chandra observations (the deepest X-ray data to date), in order to search for heavily obscured low- ...
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Major Galaxy Mergers Only Trigger the Most Luminous Active Galactic Nuclei
... active galactic nuclei (AGNs)) activity and galaxy mergers has been seen in intensely star-forming galaxies like ultraluminous infrared galaxies and in some luminous quasars ...
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Long term x ray variability of typical active galactic nuclei in the distant universe
... Variability studies are valuable for probing the physical properties of active galactic nuclei ( AGNs ) ( e.g., Ulrich et al. 1997; Peterson 2001 ) . Simple light-travel time arguments enable a fi rst-order ...
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Variability selected low luminosity active galactic nuclei in the 4 Ms chandra deep field south
... The 4 Ms Chandra Deep Field-South (CDF-S) and other deep X-ray surveys have been highly effective at selecting active galactic nuclei (AGNs). However, cosmologically distant low-luminosity AGNs (LLAGNs) ...
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Do Moderate Luminosity Active Galactic Nuclei Suppress Star Formation?
... active galactic nuclei (AGNs), as the central supermassive black hole accretes material and grows, heats the interstellar material and suppresses star ...galaxies: nuclei – X-rays: ...
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Breaking the σ₈–Ωₘ degeneracy using the clustering of HIGH-? x-ray active galactic nuclei
... The clustering of X-ray selected active galactic nuclei (AGNs) appears to be a valuable tool for extracting cos- mological information. Using the recent high-precision angular clustering results of ∼30,000 ...
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A comparative analysis of virial black hole mass estimates of moderate luminosity active galactic nuclei using Subaru/FMOS
... active galactic nuclei (AGNs), typical of those found in X-ray surveys of deep fields, with the goal of testing the validity of single-epoch virial black hole mass ...
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An Iwasawa Taniguchi effect for Compton thick active galactic nuclei
... active galactic nuclei (AGN) typ- ically takes the form of a broad-band power law with a high- energy cut-off around 300 keV (Ballantyne 2014; Malizia et ...the Galactic value (Risaliti, Maiolino ...
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Optical, Near IR, and Sub mm IFU Observations of the Nearby Dual Active Galactic Nuclei MRK 463
... We present optical and near-IR Integral Field Unit ( IFU ) and ALMA band 6 observations of the nearby dual active galactic nuclei ( AGNs ) Mrk 463. At a distance of 210 Mpc, and a nuclear separation of ∼ 4 ...
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The host galaxies and environment of Chandra selected active galactic nuclei in the deep ACS GTO cluster fields
... active galactic nuclei (AGNs) or QSOs depending on their X-ray ...these nuclei are found in near face- on late-type galaxies although selection effects might be ...the nuclei correlates with ...
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A statistical relation between the X ray spectral index and Eddington ratio of active galactic nuclei in deep surveys
... X-ray emission from active galactic nuclei (AGN) is ubiquitous (Tananbaum et al. 1979), and is often used itself as an indicator of black hole accretion activity. The hard X-ray (>2 keV) spectrum takes ...
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Obscured GOODS Active Galactic Nuclei and Their Host Galaxies at z < 1 25 : The Slow Black Hole Growth Phase
... We compute black hole masses and bolometric luminosities for 87 obscured active galactic nuclei (AGNs) in the redshift range 0.25 z 1.25, selected from the GOODS deep multi-wavelength survey fields via ...
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Lifting the Veil on Obscured Accretion : Active Galactic Nuclei Number Counts and Survey Strategies for Imaging Hard X Ray Missions
... The vast majority of the growth of supermassive black holes (SMBHs) is driven by accretion (e.g., Marconi et al. 2004; Merloni & Heinz 2008; Di Matteo et al. 2008). Therefore, a complete census of accreting SMBHs ...
15
The systematic search for z ≳ 5 active galactic nuclei in the Chandra Deep Field South
... Treister et al. (2013) used the Chandra 4-Ms data in their search for high-redshift ( z > 6) active galactic nuclei (AGN). Using a sample of preselected z = 6–8 Lyman Break dropout and pho- tometrically ...
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X RAY CONSTRAINTS ON THE ACTIVE GALACTIC NUCLEI PROPERTIES IN SPITZER INFRARED SPECTROGRAPH IDENTIFIED z similar to 2 ULTRALUMINOUS INFRARED GALAXIES
... One of the most fundamental discoveries borne out of the past two decades is that (1) local, massive galaxies almost universally host central, super-massive black holes (SMBH; 10 6 M ) and (2) there exists a tight, ...
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Clumpy stellar winds and the obscuration of active galactic nuclei
... The role of star-formation driven outflows in the obscuration of the central source in Active Galactic Nuclei (AGN) is discussed. The outflow from a sub-parsec scale accretion disc is numerically modelled ...
6
Searching for active galactic nuclei among unidentified INTEGRAL Sources
... We report on a new method to identify active galactic nuclei (AGNs) among unidentified INTEGRAL sources. This method consists of cross-correlating unidentified sources listed in the fourth Imager on Board ...
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Searching for active galactic nuclei among unidentified INTEGRAL sources
... We report on a new method to identify active galactic nuclei (AGNs) among unidentified INTEGRAL sources. This method consists of cross-correlating unidentified sources listed in the fourth Imager on Board ...
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