The Relationship of Hard X-ray and Optical Line Emission in Low Redshift Active Galactic Nuclei

Abstract

In this paper we assess the relationship of the population of Active Galactic Nuclei (AGN) selected by hard X-rays to the traditional population of AGN with strong optical emission lines. First, we study the emission-line properties of a new hard X-ray selected sample of 47 local AGN (classified optically as both Type 1 and Type 2 AGN). We find that the hard X- ray (3-20 keV) and [OIII]$\lambda$5007 optical emission-line luminosities are well-correlated over a range of about four orders-of-magnitude in luminosity (mean luminosity ratio 2.15 dex with a standard deviation of $\sigma$ = 0.51 dex). Second, we study the hard X-ray properties of a sample of 55 local AGN selected from the literature on the basis of the flux in the [OIII] line. The correlation between the hard X-ray (2-10 keV) and [OIII] luminosity for the Type 1 AGN is consistent with what is seen in the hard X-ray selected sample. However, the Type 2 AGN have a much larger range in the luminosity ratio, and many are very weak in hard X-rays (as expected for heavily absorbed AGN). We then compare the hard X-ray (3-20 keV) and [OIII] luminosity functions of AGN in the local universe. These have similar faint-end slopes with a luminosity ratio of 1.60 dex (0.55 dex smaller than the mean value for individual hard X-ray selected AGN). We conclude that at low redshift, selection by narrow optical emission- lines will recover most AGN selected by hard X-rays (with the exception of BL Lac objects). However, selection by hard X-rays misses a significant fraction of the local AGN population with strong emission lines.

References in corpus (35)

• The Sloan Digital Sky Survey: Technical Summary
• Unified Schemes for Radio-Loud Active Galactic Nuclei
• The physical properties of star forming galaxies in the low redshift universe
• The 2dF Galaxy Redshift Survey: Spectra and redshifts
• Cosmological Evolution of the Hard X-ray AGN Luminosity Function and the Origin of the Hard X-ray Background
• Present-Day Growth of Black Holes and Bulges: the SDSS Perspective
• The host galaxies of radio-loud AGN: mass dependencies, gas cooling and AGN feedback
• The 2dF QSO Redshift Survey - XII. The spectroscopic catalogue and luminosity function
• The distribution of absorbing column densities among Seyfert 2 galaxies
• A 3 dimensional diagnostic diagram for Seyfert 2s: probing X-ray absorption and Compton thickness
• The Cosmic Evolution of Hard X-ray Selected Active Galactic Nuclei
• Candidate Type II Quasars from the Sloan Digital Sky Survey: I. Selection and Optical Properties of a Sample at 0.3<Z<0.83
• ASCA observations of Seyfert 1 galaxies: I. Data Analysis, Imaging and Timing
• Substructures in Cold Dark Matter Haloes
• A sample of radio-loud AGN in the Sloan Digital Sky Survey
• Active Galactic Nuclei in the Sloan Digital Sky Survey: I. Sample Selection
• Aperture effects on Star Formation Rate, Metallicity and Reddening
• Active Galactic Nuclei in the Sloan Digital Sky Survey: II. Emission-Line Luminosity Function
• Radio Loud and Radio Quiet Active Galactic Nuclei
• "Hidden" Seyfert 2 Galaxies and the X-ray Background
• Obscuring Material around Seyfert Nuclei with Starbursts
• The Changing AGN Population
• The HELLAS2XMM survey: II. Multiwavelength observations of P3: an X-ray bright, optically inactive galaxy
• Elusive Active Galactic Nuclei
• XMM-Newton observations expose AGN in apparently normal galaxies
• RXTE all-sky slew survey. Catalog of X-ray sources at |b|>10deg
• Testing the Seyfert Unification Theory: Chandra HETGS Observations of NGC 1068
• Statistical properties of local active galactic nuclei inferred from the RXTE 3-20 keV all-sky survey
• Hard X-ray emitting Active Galactic Nuclei selected by the Chandra Multi-wavelength Project
• Extreme X-ray Iron Lines in Active Galactic Nuclei
• Submillimetre photometry of X-ray absorbed QSOs: their formation and evolutionary status
• Chandra-SDSS Normal and Star-Forming Galaxies I: X-ray Source Properties of Galaxies Detected by Chandra in SDSS DR2
• The Hellas2XMM survey: III. Multiwavelength observations of hard X-ray selected sources in the PKS 0312-77 field
• Deconstructing NGC 7130
• The Obscuring Starburst of NGC 6221 and Implications for the Hard X-ray Background

Cited by in corpus (219)

• The Host Galaxies and Classification of Active Galactic Nuclei
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• Nuclear Activity in Nearby Galaxies
• An Observational Determination of the Bolometric Quasar Luminosity Function
• A Continuum of H- to He-Rich Tidal Disruption Candidates With a Preference for E+A Galaxies
• On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies
• The Discovery of 1000 km/s Outflows in Massive Post-starburst Galaxies at z=0.6
• Space density of optically-selected type 2 quasars
• Narrow-line region gas kinematics of 24,264 optically-selected AGN: the radio connection
• Swift BAT Survey of AGN
• Galaxy pairs in the Sloan Digital Sky Survey - VIII: The observational properties of post-merger galaxies
• UV/Optical Detections of Candidate Tidal Disruption Events by GALEX and CFHTLS
• Ongoing and co-evolving star formation in zCOSMOS galaxies hosting Active Galactic Nuclei
• Luminous Thermal Flares from Quiescent Supermassive Black Holes
• Timing the starburst-AGN connection
• A New Diagnostic of Active Galactic Nuclei: Revealing Highly-Absorbed Systems at Redshift>0.3
• Ultraviolet Detection of the Tidal Disruption of a Star by a Supermassive Black Hole
• Star formation and AGN activity in SDSS cluster galaxies
• Accretion-Driven Evolution of Black Holes: Eddington Ratios, Duty Cycles, and Active Galaxy Fractions
• The bolometric luminosity of type 2 AGN from extinction-corrected [OIII]: no evidence for Eddington-limited sources
• A radio jet from the optical and x-ray bright stellar tidal disruption flare ASASSN-14li
• Suzaku Observations of Active Galactic Nuclei Detected in the Swift/BAT Survey: Discovery of "New Type" of Buried Supermassive Black Holes
• A tidal disruption flare in a massive galaxy? Implications for the fuelling mechanisms of nuclear black holes
• The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers of ionised outflows in the host galaxies of X-ray AGN
• A Population of Bona Fide Intermediate Mass Black Holes Identified as Low Luminosity Active Galactic Nuclei
• Radio AGN in the local universe: unification, triggering and evolution
• The X-ray and Radio Connection in Low-luminosity Active Nuclei
• AEGIS: The Clustering of X-ray AGN Relative to Galaxies at z~1
• New Indicators for AGN Power: The Correlation Between [O IV] lambda 25.89 micron and Hard X-ray Luminosity for Nearby Seyfert Galaxies
• iPTF Discovery of the Rapid "Turn On" of a Luminous Quasar
• High-Velocity Outflows Without AGN Feedback: Eddington-Limited Star Formation in Compact Massive Galaxies
• An outflow powers the optical rise of the nearby, fast-evolving tidal disruption event AT2019qiz
• Penetrating the Deep Cover of Compton Thick Active Galactic Nuclei
• Interactions, star formation and AGN activity
• The Origin of Double-Peaked Narrow Lines in Active Galactic Nuclei I: Very Large Array Detections of Dual AGNs and AGN Outflows
• Widespread and Hidden Active Galactic Nuclei in Star-Forming Galaxies at Redshift > 0.3
• The mid IR -- hard X-ray correlation in AGN and its implications for dusty torus models
• Chandra X-ray and Hubble Space Telescope Imaging of Optically Selected kiloparsec-Scale Binary Active Galactic Nuclei I. Nature of the Nuclear Ionizing Sources
• Type 1 AGN at low z. II. The relative strength of narrow lines and the nature of intermediate type AGN
• The cosmological properties of AGN in the XMM-Newton Hard Bright Survey
• Candidate Type II Quasars at 2 < z < 4.3 in the Sloan Digital Sky Survey III
• Connecting Galaxy Evolution, Star Formation and the X-ray Background
• Mergers Do Trigger AGNs out to z $\sim$ 0.6
• AEGIS: Demographics of X-ray and Optically Selected AGNs
• The Swift BAT-detected Seyfert 1 Galaxies: X-ray Broadband Properties and Warm Absorbers
• Calibration of [O IV] 26 micron as a Measure of Intrinsic AGN Luminosity
• Uncovering obscured luminous AGN with WISE
• Ongoing Formation of Bulges and Black Holes in the Local Universe: New Insights from GALEX
• Indicators of Intrinsic AGN Luminosity: a Multi-Wavelength Approach
• The MOSDEF survey: AGN multi-wavelength identification, selection biases and host galaxy properties
• The Field X-ray AGN Fraction to z=0.7 from the Chandra Multiwavelength Project and the Sloan Digital Sky Survey
• An Observed Link between Active Galactic Nuclei and Violent Disk Instabilities in High-Redshift Galaxies
• Optical Spectral Properties of Swift BAT Hard X-ray Selected Active Galactic Nuclei Sources
• SALT Long-slit Spectroscopy of Luminous Obscured Quasars: An Upper Limit on the Size of the Narrow-Line Region?
• PTF10iya: A short-lived, luminous flare from the nuclear region of a star-forming galaxy
• NTT, Spitzer and Chandra spectroscopy of SDSSJ095209.56+214313.3: the most luminous coronal-line supernova ever observed, or a stellar tidal disruption event ?
• Implications from Late-Time X-ray Detections of Optically Selected Tidal Disruption Events: State Changes, Unification, and Detection Rates
• [O III] Equivalent Width and Orientation Effects in Quasars
• XMM-Newton observations of Seyfert galaxies from the Palomar spectroscopic survey: the X-ray absorption distribution
• The drivers of AGN activity in galaxy clusters: AGN fraction as a function of mass and environment
• The Origin of Line Emission in Massive z~2.3 Galaxies: Evidence for Cosmic Downsizing of AGN Host Galaxies
• [O III]$\lambda 5007$ and X-ray Properties of a Complete Sample of Hard X-ray Selected AGNs in the Local Universe
• BAT AGN Spectroscopic Survey II: X-ray Emission and High Ionization Optical Emission Lines
• A Combined Optical and X-ray Study of Unobscured Type 1 AGN. II. Relation Between X-ray Emission and Optical Spectra
• Mid-Infrared Properties of the Swift Burst Alert Telescope Active Galactic Nuclei Sample of the Local Universe. I. Emission-Line Diagnostics
• Massive Compact Galaxies with High-Velocity Outflows: Morphological Analysis and Constraints on AGN Activity
• Chandra Observations of a 1.9 kpc Separation Double X-ray Source in a Candidate Dual AGN Galaxy at z=0.16
• The accretion ratios in Seyfert 2 galaxies with and without hidden broad-line regions
• NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars
• X-ray Properties of Intermediate-mass Black Holes in Active Galaxies. III. Spectral Energy Distribution and Possible Evidence for Intrinsically X-ray-weak AGNs
• The [OIII] emission line luminosity function of optically selected type-2 AGN from zCOSMOS
• Active Galactic Nucleus Pairs from the Sloan Digital Sky Survey. II. Evidence for Tidally Enhanced Star Formation and Black Hole Accretion
• NuSTAR Observations of Heavily Obscured Quasars at z ~ 0.5
• Mid-infrared spectra of optically selected type 2 quasars
• The X-ray view of Giga-Hertz Peaked Spectrum Radio Galaxies
• The nature of the jet-driven outflow in the radio galaxy 3C305
• XMM-Newton Observations of a Complete Sample of Optically Selected Type 2 Seyfert Galaxies
• SDSS-IV MaNGA: Identification of active galactic nuclei in optical integral field unit surveys
• X-ray Spectral Constraints for z~2 Massive Galaxies: The Identification of Reflection-Dominated Active Galactic Nuclei
• Galaxy And Mass Assembly (GAMA): Active Galactic Nuclei in Pairs of Galaxies
• The Tidal Disruption Event AT 2018hyz II: Light Curve Modeling of a Partially Disrupted Star
• Cross-correlation of the 2XMMi catalogue with Data Release 7 of the Sloan Digital Sky Survey
• The Fundamental Plane of Black Hole Activity in the Optical Band
• Luminous WISE-selected Obscured, Unobscured, and Red Quasars in Stripe 82
• Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. II. Spatially Resolved Mass Outflow Rates for the QSO2 Markarian 34
• Crossing the Line: Active Galactic Nuclei in the Star-forming region of the BPT Diagram
• Uncovering Obscured Active Galactic Nuclei in Homogeneously Selected Samples of Seyfert 2 Galaxies
• X-ray Bright Active Galactic Nuclei in Massive Galaxy Clusters II: The Fraction of Galaxies Hosting Active Nuclei
• Chandra and XMM Observations of Type II Quasars from the SDSS
• Searching for Compton-thick active galactic nuclei at z~0.1
• Distinguishing Tidal Disruption Events from Impostors
• The Presence of Weak Active Galactic Nuclei in High Redshift Star Forming Galaxies
• The Radio Properties of Type 2 Quasars
• The puzzling case of the radio-loud QSO 3C 186: a gravitational wave recoiling black hole in a young radio source?
• Activity in galactic nuclei of cluster and field galaxies in the local universe
• SDSS-IV eBOSS Spectroscopy of X-ray and WISE AGN in Stripe 82X: Overview of the Demographics of X-ray and Mid-Infrared Selected Active Galactic Nuclei
• The Large Area Radio Galaxy Evolution Spectroscopic Survey (LARGESS): Survey design, data catalogue and GAMA/WiggleZ spectroscopy
• 15-GHz radio emission from nearby low-luminosity active galactic nuclei
• An elliptical accretion disk following the tidal disruption event AT 2020zso
• Exploring the Connection Between Star Formation and AGN Activity in the Local Universe
• Testing Black Hole Jet Scaling Relations in Low Luminosity AGN
• A Large Population of Obscured AGN in Disguise as Low Luminosity AGN in Chandra Deep Field South
• Effect of bars in AGN host galaxies and black hole activity
• X-ray Constraints on the AGN Properties in Spitzer-IRS identified z~2 Ultraluminous Infrared Galaxies
• Determining Inclinations of Active Galactic Nuclei Via Their Narrow-Line Region Kinematics - II. Correlation With Observed Properties
• Cosmic Train Wreck by Massive Black Holes: Discovery of a kpc-Scale Triple Active Galactic Nucleus
• A comparison of hard X-ray photon indices and iron \ka emission lines in X-ray luminous narrow- and broad-line Seyfert 1 galaxies
• Star formation and AGN activity in a sample of local Luminous Infrared Galaxies through multi-wavelength characterization
• A New Infrared Criterion for Selecting Active Galactic Nuclei to Lower Luminosities
• A Second Look at 12 Candidate Dual AGNs using $\mathtt{BAYMAX}$
• Emission Line Properties of Seyfert Galaxies in the 12 Micron Sample
• Evidence for Black Hole Growth in Local Analogs to Lyman Break Galaxies
• Discovery of heavily-obscured AGN among 7 INTEGRAL hard X-ray sources observed by Chandra
• Delving Into X-ray Obscuration of Type 2 AGN, Near and Far
• An Archival Chandra and XMM-Newton Survey of Type 2 Quasars
• The OPTX Project IV: How Reliable is [OIII] as a Measure of AGN Activity?
• X-ray spectral properties of Seyfert galaxies and the unification scheme
• A New Sample of Buried Active Galactic Nuclei Selected from the Second XMM-Newton Serendipitous Source Catalogue
• The impact of bars and interactions on optically selected AGNs in spiral galaxies
• Chandra Observations of Candidate "True" Seyfert 2 Nuclei
• A search for AGN in the most extreme UV-selected starbursts using the European VLBI Network
• Optical and mid-infrared line emission in nearby Seyfert galaxies
• Optical Properties of Host Galaxies of Extragalactic Nuclear Water Masers
• Disclosing the properties of low-redshift dual AGN through XMM-Newton and SDSS spectroscopy
• The Role of Major Mergers and Nuclear Star Formation in Nearby Obscured Quasars
• Accretion Properties of A Sample of Hard X-ray (<60keV) Selected Seyfert 1 Galaxies
• The Global Implications of the Hard X-ray Excess in Type 1 AGN
• Central Engine and Host Galaxy of RXJ 1301.9+2747: A Multiwavelength View of a Low-mass Black Hole Active Galactic Nuclei with Ultra-soft X-ray Emission
• The dependence of AGN activity on stellar and halo mass in Semi-Analytic Models
• Galaxies Correlating with Ultra-high Energy Cosmic Rays
• On the nuclear obscuration of H2O maser galaxies
• CLEAR: High-Ionization [Ne V] $\lambda$3426 Emission-line Galaxies at $1.4<z<2.3$
• Kiloparsec-scale radio emission in Seyfert and LINER galaxies
• History and destiny of an emerging early-type galaxy: New IFU insights on the major-merger remnant NGC7252
• A large, deep 3 deg${}^2$ survey of H$\alpha$, [OIII], and [OII] emitters from LAGER: constraining luminosity functions
• On the nature of the absorber in IRAS 09104+4109: the X-ray and mid-infrared view
• Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within $10^4$ years
• Interacting galaxies: co-rotating and counter-rotating systems with tidal tails
• A Chandra X-ray Survey of Optically Selected AGN Pairs
• Spatially Offset Active Galactic Nuclei. II: Triggering in Galaxy Mergers
• Shrinking the Braneworld: Black Hole in a Globular Cluster
• Active Galactic Nucleus Pairs from the Sloan Digital Sky Survey. III. Chandra X-ray Observations Unveil Obscured Double Nuclei
• Compton-thick AGN in the NuSTAR era II: A deep NuSTAR and XMM-Newton view of the candidate Compton thick AGN in NGC 1358
• Discovery of the luminous X-ray ignition eRASSt J234402.9$-$352640; I. Tidal disruption event or a rapid increase in accretion in an active galactic nucleus?
• NuSTAR Observations of AGN with Low Observed X-ray to [OIII] Luminosity Ratios: Heavily Obscured AGN or Turned-Off AGN?
• An Off-Nucleus Nonstellar Black Hole in the Seyfert Galaxy NGC 5252
• AGN spiral galaxies in groups: effects of bars
• Measuring the level of nuclear activity in Seyfert galaxies and the unification scheme
• The X-ray view of optically selected dual AGN
• An FMOS Survey of moderate-luminosity broad-line AGN in COSMOS, SXDS and E-CDF-S
• IFU spectroscopy of 10 early type galactic nuclei: II - Nuclear emission line properties
• Chandra Observations of Nuclear X-ray Emission from Low Surface Brightness Galaxies
• BH Accretion in Low-Mass Galaxies Since z~1
• The Second Nucleus of NGC 7727: Direct Evidence for the Formation and Evolution of an Ultracompact Dwarf Galaxy
• The Hunt for Red Quasars: Luminous Obscured Black Hole Growth Unveiled in the Stripe 82 X-ray Survey
• New nearby AGNs from all sky surveys of INTEGRAL and RXTE observatories
• Young stellar populations in type II quasars: timing the onset of star formation and nuclear activity
• Accretion disk versus jet orientation in H${}_2$O megamaser galaxies
• Chandra X-ray and Hubble Space Telescope Imaging of Optically Selected Kiloparsec-Scale Binary Active Galactic Nuclei II: Host Galaxy Morphology and AGN Activity
• Strong [O III] Objects Among SDSS Broad-Line Active Galaxies
• The Effect of Minor and Major Mergers on the Evolution of Low Excitation Radio Galaxies
• Broadband X-ray Spectral Analysis of the Double-Nucleus Luminous Infrared Galaxy Mrk 463
• A redline starburst: CO(2-1) observations of an Eddington-limited galaxy reveal star formation at its most extreme
• On the relation between Seyfert 2 accretion rate and environment at z < 0.1
• Activity in Galactic Nuclei of Compact Group Galaxies in the Local Universe
• The Nature of Obscuration in AGN: I. Insights from Host Galaxies
• Several New Active Galactic Nuclei Among X-ray Sources Detected by INTEGRAL and SWIFT Observatories
• The role of stellar mass and environment for cluster blue fraction, AGN fraction and star-formation indicators from a targeted analysis of Abell 1691
• Galaxy and Mass Assembly (GAMA): A $\text{WISE}$ study of the activity of emission-line systems in G23
• X-ray spectroscopy of the Compton-thick Seyfert 2 ESO 138-G1
• Active galactic nuclei ghosts: A systematic search for faded nuclei
• A Tale of Two Narrow-Line Regions: Ionization, Kinematics, and Spectral Energy Distributions for a Local Pair of Merging Obscured Active Galaxies
• Discovery of Compton-thick quasars in the Sloan Digital Sky Survey
• Effects of extended components of \oiii on the correlation between the \oiii luminosity and the power-law continuum luminosity for active galactic nuclei
• Low-frequency radio observations of Seyfert galaxies: A test to the unification scheme
• Are SMBHs shrouded by "super-Oort" clouds of comets and asteroids?
• Emission and Absorption Properties of Low-Mass Type 2 Active Galaxies with XMM-Newton
• A Novel Method to Identify AGNs Based on Emission Line Excess and the Nature of Low-luminosity AGNs in the Sloan Digital Sky Survey: II - Nature of Low-luminosity AGNs
• A More Efficient Search for H2O Megamaser Galaxies : The Power of the X-ray and Mid-infrared Photometry
• The eROSITA Final Equatorial-Depth Survey (eFEDS): The first archetypal Quasar in the feedback phase discovered by eROSITA
• The nascent milliquasar VT J154843.06+220812.6: tidal disruption event or extreme accretion-state change?
• The Contribution of Active Galactic Nuclei to the Microjansky Radio Population
• Quantifying the cool ISM in radio AGNs: evidence for late-time re-triggering by galaxy mergers and interactions
• 1.4 GHz on the Fundamental Plane of Black Hole Activity
• Towards a More Complete Optical Census of Active Galactic Nuclei, Via Spatially-Resolved Spectroscopy
• Wavelength Dependences of the Optical/UV and X-ray Luminosity Correlations of Quasars
• Shocks and Spatially Offset Active Galactic Nuclei Produce Velocity Offsets in Emission Lines
• A New Physical Picture for AGNs Lacking Optical Emission Lines
• Megamaser detection and nuclear obscuration in Seyfert galaxies
• The interaction of the active nucleus with the host galaxy interstellar medium
• Insights Into AGN and Host Galaxy Co-evolution From Hard X-ray Emission
• Suzaku X-ray spectral study of the Compton-thick Seyfert galaxy NGC 5135
• An XMM-Newton study of active-inactive galaxy pairs
• Intervening or associated? Machine learning classification of redshifted H I 21-cm absorption
• Detection of a hot intergalactic medium in the spiral-only compact group SCG0018-4854
• The XMM spectral catalog of SDSS optically selected Seyfert 2 galaxies
• Multi-wavelength Selected Compton-thick AGNs in Chandra Deep Field-South Survey
• Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
• VLT-MUSE spectroscopy of AGNs misclassified by BPT diagnostic or with weak emission lines
• The Complex X-ray Obscuration Environment in the Radio Loud Type 2 Quasar 3C 223
• SDSS-IV MaNGA: Identification and Multiwavelength Properties of Type-1 AGN in the DR15 sample
• Multi-band constraints on the nature of emission line galaxies
• Deep Herschel observations of the 2Jy sample: assessing the non-thermal and AGN contributions to the far-IR continuum
• X-ray view of four high-luminosity Swift/BAT AGN: Unveiling obscuration and reflection with Suzaku
• Host Galaxy Line Diagnostics for the Candidate Tidal Disruption Events XMMSL1 J111527.3+180638 and PTF09axc
• The Luminosity function of Narrow-Line Seyfert galaxies based on SDSS data
• AGN -- host galaxy photometric decomposition using a fast, accurate and precise deep learning approach
• Mapping the Excitation Mechanisms in the LINER I Active Galactic Nucleus NGC 5005: Positive Feedback and a Thin LINER Cocoon
• Multiwavelength Analysis of a Nearby Heavily Obscured AGN in NGC 449
• On the origin of X-ray oxygen emission-lines in obscured AGN
• Obscured accretion from AGN surveys
• Obscured Narrow-Line Seyfert 1 Galaxy Candidate Mrk 1388 with Nonthermal Jets
• NuSTAR reveals that the heavily obscured nucleus of NGC 2785 was the contaminant of IRAS 09104+4109 in the BeppoSAX/PDS hard X-rays
• A Comprehensive Multiwavelength Study of the OH Megamaser galaxy IRAS 09320+6134
• A search for H${}_2$O masers in 100 active dwarf galaxies
• Mid-infrared Variability-based AGN Selection using the Multi-epoch Photometric Data from WISE
• X-ray properties of two complementary samples of intermediate Seyfert galaxies
• Physical Drivers of Emission Line Diversity of SDSS Seyfert 2s and LINERs After Removal of Contributions by Star Formation
• Insights for Early Massive Black Hole Growth from JWST Detection of the [Ne v] λ3427 Emission Line