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15 results for “Active Galactic Nuclei”
Dataset: A New Infrared Criterion for Selecting Active Galactic Nuclei to Lower Luminosities
<p>The dataset accompanying the paper "A New Infrared Criterion for Selecting Active Galactic Nuclei to Lower Luminosities" (Hviding et al. in prep)</p>
Data Release of Cosmic evolution of the incidence of Active Galactic Nuclei in massive clusters: Simulations versus observations
<p>Dataset of the paper "Cosmic evolution of the incidence of Active Galactic Nuclei in massive clusters: Simulations versus observations".</p> <p> </p> <p>All the necessary code to deal with these data can be found in: https://github.com/IvanMuro/agn_frac_data_release</p>
The NGDEEP NIRIS calibration files for 'The Next Generation Deep Extragalactic Exploratory Public Near-Infrared Slitless Survey Epoch 1 (NGDEEP-NISS1): Extra-Galactic Star-formation and Active Galactic Nuclei at 0.5 < z < 3.6
<p>GRISMCONF configurations files used in Pirzkal et al. 2024. These contain the full field calibrated solution for the dispersion solution, trace as well as wavelength calibration. They provide a mean to extract NIRISS WFSS spectra obtained using the F115W, F150W, or F200W to within an acccuracy better than 0.25 pixel over most of the field of view. Wavelength calibration of both grism was verified to be accurate to within 15A over most of the field of view. Details can be found in Appendix A of Pirzkal et al. 2024.</p>
Light curves included in "Broad-Line Region Characterization in Dozens of Active Galactic Nuclei Using Small-Aperture Telescopes"
<p> </p> <p><strong>This repository is for the paper "Broad-Line Region Characterization in Dozens of Active Galactic Nuclei Using Small-Aperture Telescopes" by Catalina Sobrino Figaredo. It is associated with the manuscript number AAS557954.</strong></p> <p><strong>Table Information:<br></strong><strong>EXTNAME</strong>: Name as a combination of the object name and the year of observation<br>(e.g., HE2128-0221_YEAR=2016)<br><strong>Columns</strong>:<br><strong>MJD</strong>: Modified Julian Date<br><strong>FLUX</strong>: Flux in mJy<br><strong>ERRFLUX</strong>: Flux uncertainty in mJy<br><strong>FILTER</strong>: The observation filter (B_j, V_j, r_s, R_j, 670, 680, 690, SII)</p>
Catalogues of active galactic nuclei from Gaia and unWISE data (updated to Gaia DR3 astrometric solution)
<p>This is a minor update to the Gaia-unWISE AGN catalogue published in Shu et al. 2019, MNRAS, 489, 4741. It contains the same 2.7 million AGN candidates selected from the Gaia DR2 and unWISE data using a random forest classifier. In addition to the original columns (which are explained in detail in Shu et al. 2019), a few new columns that correspond to Gaia DR3 astrometric solutions are appended, i.e. dr3_source_id, dr3_pmra, dr3_pmra_err, dr3_pmdec, dr3_pmdec_err, dr3_plx, dr3_plx_err, dr3_pmsig, and dr3_plxsig. </p>
Data Release Scrutinising evidence for the triggering of Active Galactic Nuclei in the outskirts of massive galaxy clusters at z~1
<p>Dataset of the paper "Scrutinising evidence for the triggering of Active Galactic Nuclei in the outskirts of massive galaxy clusters at z~1".</p> <p> </p> <p>All the necessary code to deal with these data can be found at: https://github.com/IvanMuro/agn_frac_data_release</p>
Investigating the interplay between the coronal properties and the hard X-ray variability of active galactic nuclei with NuSTAR
<p>These are the figures in the Appendices C and D of the A&A article "Investigating the interplay between the coronal properties and the hard X-ray variability of active galactic nuclei with NuSTAR" by R. Serafinelli et al (2024), already accepted for publications.</p> <p>Appendix C contains all the spectra and data-to-model ratios, while Appendix D contains all the X-ray light curves.</p>
Catalogues of active galactic nuclei from Gaia and unWISE data
<p>This fits file is the Gaia-unWISE AGN catalogue published in Shu et al. 2019, MNRAS, 489, 4741. It contains 2.7 million AGN candidates selected from the Gaia DR2 and unWISE data using a random forest classifier. Descriptions of all the columns of the fits file are available in Shu et al. 2019. </p>
All Data Used in "The effects of Time-Variable Absorption due to Gamma-Ray Bursts In Active Galactic Nuclei Accretion Disks"
<p>This dataset submission contains the data necessary to reproduce any and all results presented in the paper "The effects of Time-Variable Absorption due to Gamma-Ray Bursts In Active Galactic Nuclei Accretion Disks", set to be submitted for publication in the coming days.</p>
All Data Used in "The effects of Time-Variable Absorption due to Gamma-Ray Bursts In Active Galactic Nuclei Accretion Disks"
<p>These files contain all the data necessary to fully reproduce any and all results presented in the paper "The effects of Time-Variable Absorption due to Gamma-Ray Bursts In Active Galactic Nuclei Accretion Disks", set to be submitted to MNRAS in the coming days. </p>
The cosmic web of X-ray active galactic nuclei seen through the eROSITA Final Equatorial Depth Survey (eFEDS)
<p>Which galaxies in the general population turn into active galactic nuclei (AGN) is a keystone of galaxy formation and evolution.</p> <p>Thanks to SRG/eROSITA’s contiguous 140 square degrees pilot survey field, we constructed a large, complete, and unbiased soft<br> X-ray flux-limited AGN sample at low redshift 0.05 < z < 0.55. Two summary statistics, the clustering using spectra from SDSS-V<br> and galaxy-galaxy lensing with imaging from HSC, are measured and interpreted with halo occupation distribution and abundance<br> matching models. Both models successfully account for the observations. We obtain an exceptional complete view of the AGN 12<br> halo occupation distribution. The population of AGN is broadly distributed among halos with a mean mass of 3.9+2.0−2.4 × 10 M⊙ .<br> +0.08. This corresponds to a large-scale halo bias of b(z = 0.34) = 0.99−0.10 . The central occupation has a large transition parameter σlog10 (M) = 1.28 ± 0.2. The satellite occupation distribution is characterized by a shallow slope αsat = 0.73 ± 0.38. We find that AGNs in satellites are rare, with fsat < 20%. Most soft X-ray-selected AGNs are hosted by central galaxies in their dark matter halo. A weak correlation between soft X-ray luminosity and large-scale halo bias is confirmed (3.3σ). We discuss the implications of environmental-dependent AGN triggering. This study paves the way towards fully charting, in the coming decade, the co-evolution of X-ray AGN, their host galaxies, and dark matter haloes by combining eROSITA with SDSS-V, 4MOST, DESI, LSST, and Euclid.</p>
Classifications of Active Galactic Nuclei According to the Traditional Unification Scheme
<p>The figure illustrates the unification scheme of active galactic nuclei (AGN). The physical appearance of galactic nuclei is sketched in the parameter space spanned by the black-hole spin (x-axis) and the accretion rate in units of the Eddington rate (y-axis). Non-jetted (radio-quiet) objects populate mainly the low-black-hole-spin regime, whereas galactic nuclei in the high-spin domain are thought to exhibit a relativistic jet and are thus called jetted AGN (or radio-loud AGN).</p> <p>If non-jetted AGN accrete matter at a low rate, the galactic nucleus is inactive, like in the case of our Milky Way's central supermassive black hole, Sagittarius A*. If they have at least a moderate accretion rate, they are active and observable as a Seyfert galaxy. Seyfert galaxies of type 1 are those objects seen at small viewing angles (more face-on) with well-known examples being Messier 77 or NGC 3147, while type 2 Seyfert galaxies, like for example NGC 1097, are those that are observed at higher viewing angle (more edge-on), such that the dusty, equatorial torus obscures the central engine for this line of sight. At very high accretion rate or very low viewing angle, low-spin AGN are sometimes called quasi-stellar objects.</p> <p>Jetted AGN with high accretion rate appear as flat-spectrum radio quasars if they are seen face-on. An archetypical example is the long-known object 3C 279. If jetted AGN with high accretion rate are not seen face-on, they are called Fanaroff-Riley type II radio galaxies, like for example the famous Cygnus A radio galaxy. These can, again depending on the viewing angle, appear as broad-line radio galaxies (type 1 objects) or as narrow-line radio galaxies (type 2 objects). At low accretion rate, jetted AGN are appearing as BL Lacertae objects if seen face-on. Famous examples for BL Lacertae objects are the eponymous BL Lacertae itself or the prominent TeV emitter Markarian 501. Jetted AGN with low accretion rate are classified as Fanaroff-Riley I radio galaxies if seen more edge-on. A typical example for this AGN subclass is Messier 84.</p> <p>Jetted AGN that are seen at small viewing angles are comprisingly called blazars.</p> <p>Remark however that it is still unclear whether the physical parameter corresponding to the x-axis is really the angular momentum of the central supermassive black hole, or perhaps another quantity like its mass or even a combination of several parameters. Notice also that in AGN classification there are far more classes and subclasses, depending on more refined observational properties, and ambiguities as well as overlaps. This figure was motivated by the sketch by Prof. Dr. Charles Dermer appearing in DOI 10.1016/j.crhy.2016.04.004.</p>
CGRO BATSE-Observed Piccinotti Sample of Active Galactic Nuclei
Compton Gamma-Ray Observatory (CGRO) BATSE Earth-occultation data have been used by Malizia et al. (1999, ApJ, 519, 637) to search for emission in the 20-100 keV band from all sources in the Piccinotti sample (Piccinotti et al. 1982, ApJ, 253, 485: the HEASARC A2PIC database), which represents the only complete 20-10 keV survey to date of the extragalactic sky down to a limiting flux of 3.1 x 10<sup>-11</sup> ergs cm<sup>-2</sup> s<sup>-1</sup>. Nearly 4 years of observations have been analyzed to reach a 5-sigma confidence level of about 7.8 x 10<sup>-11</sup> ergs cm<sup>-2</sup> s<sup>-1</sup> in the band considered. Of the 36 sources in the sample, 14 have been detected above the 5-sigma confidence level, while marginal detection (3 <= sigma <= 5) can be claimed for 13 sources; for nine objects, 2 sigma upper limits are reported. A comparison of BATSE results with data at higher energies is used to estimate the robustness of the data analysis. While the detection level of each source is reliable, the flux measurement may be overestimated in some sources by as much as 35%, probably because of incomplete data cleaning. Comparison of BATSE fluxes with X-ray fluxes obtained in the 2-10 keV range and averaged over years indicates that a canonical power law of photon index 1.7 gives a good description of the broadband spectra of bright active galactic nuclei (AGNs) and that spectral breaks preferentially occur above 100 keV. This HEASARC database was created in October 1999 based primarily on Table 1 of Malizia et al. (1999), together with the positions and HEAO-1 designations taken from the original Piccinotti Catalog (Piccinotti et al. 1982, ApJ, 253, 485: the HEASARC A2PIC database). This is a service provided by NASA HEASARC .
ROSAT North Ecliptic Pole Survey Active Galactic Nuclei Catalog
The ROSAT North Ecliptic Pole (NEP) Survey of Active Galactic Nuclei (AGN) Catalog is an X-ray flux-limited sample of 219 AGN discovered in the contiguous 80.7 square degrees region of the ROSAT North Ecliptic Pole (NEP) Survey (Gioia et al. 2003, ApJS, 149, 29; <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/149/29">CDS Cat. <J/ApJS/149/29></a>). This catalog features complete optical identifications and spectroscopic redshifts. The median redshift, X-ray flux, and X-ray luminosity are z = 0.41, fx = 1.1 x 10<sup>-13</sup> erg/cm<sup>2</sup>/s, and Lx = 9.2 x 10<sup>43</sup> h70<sup>-2</sup> erg/s (0.5 - 2.0 keV), respectively. Unobscured Type 1 AGN are the dominant constituents (90%) of this soft X-ray-selected sample of AGN. This catalog sample includes several notable revisions relative to previous versions of the catalog (Mullis 2001, Ph. D. thesis, U. Hawaii; Gioia et al. 2003, ApJS, 149, 29, available in HEASARC Browse as the ROSNEPOID table). Firstly, the AGN fluxes and luminosities previously reported were overestimated by approximately 20% on average as a result of an error in the conversion of X-ray count rate to flux. Secondly, the sample has grown by 1 because of the reclassification of one of the X-ray sources (RX J1824.7+6509). Finally, in the present study the authors have adopted the presently favored "concordance" cosmology in computing the X-ray luminosities. The revised and updated catalog with corrected properties presented here should be the reference point for any future work with the ROSAT NEP AGN sample. This table was created by the HEASARC in August 2005 based on CDS table J/ApJ/617/192/table1.dat. This is a service provided by NASA HEASARC .
Swift BAT 60-Month Survey of Active Galactic Nuclei Catalog
Surveys above 10 keV represent one of the best resources to provide an unbiased census of the population of active galactic nuclei (AGNs). The authors present the results of 60 months of observation from 2005 March to 2010 March of the hard X-ray sky with the Swift Burst Alert Telescope (BAT). In this time frame, BAT detected (in the 15 - 55 keV band) 720 sources with a signal-to-noise ratio of >= 5 sigma in an all-sky survey, of which 428 are associated with AGNs, most of which are nearby. This sample has negligible incompleteness and statistics which are a factor of ~ 2 larger over similarly complete sets of AGNs. The sample contains (at least) 15 bona fide Compton-thick AGNs and 3 likely candidates. Compton-thick AGNs represent ~ 5% of AGN samples detected above 15 keV. The authors use the BAT data set to refine the determination of the log N - log S of AGNs which is extremely important, now that NuSTAR prepares for launch, toward assessing the AGN contribution to the cosmic X-ray background. The authors show that the log N - log S of AGNs selected above 10 keV is now established to ~ 10% precision. They derive the luminosity function of Compton-thick AGNs and measure a space density of 7.9 (+4.1, -2.9) x 10<sup>-5</sup> Mpc<sup>-3</sup> for objects with a de-absorbed luminosity larger than 2 x 10<sup>42</sup> erg s<sup>-1</sup>. As the BAT AGNs are all mostly local, they allow us to investigate the spatial distribution of AGNs in the nearby universe regardless of absorption. The authors find concentrations of AGNs that coincide spatially with the largest congregations of matter in the local (<= 85 Mpc) universe. There is some evidence that the fraction of Seyfert 2 objects is larger than average in the direction of these dense regions. This table was created by the HEASARC in May 2012, based on an electronic version of Table 1 from the referenced paper, which was obtained from the ApJ website. This is a service provided by NASA HEASARC .
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