LeMMINGs IV: The X-ray properties of a statistically-complete sample of the nuclei in active and inactive galaxies from the Palomar sample

Abstract

All 280 of the statistically-complete Palomar sample of nearby (<120 Mpc) galaxies dec > 20 degrees have been observed at 1.5 GHz as part of the LeMMINGs e-MERLIN legacy survey. Here, we present Chandra X-ray observations of the nuclei of 213 of these galaxies, including a statistically-complete sub-set of 113 galaxies in the declination range 40 degrees to 65 degrees. We observed galaxies of all optical spectral types, including 'active' galaxies (e.g., LINERs and Seyferts) and 'inactive' galaxies like HII galaxies and absorption line galaxies (ALG). The X-ray flux limit of our survey is 1.65$\times$10${}^{-14}$~erg s${}^{-1}$ cm${}^{-2}$ (0.3$-$10 keV). We detect X-ray emission coincident within 2-arcsec of the nucleus in 150/213 galaxies, including 13/14 Seyferts, 68/77 LINERs, 13/22 ALGs and 56/100 HII galaxies, but cannot completely rule out contamination from non-AGN processes in sources with nuclear luminosities <10${}^{39}$ erg s${}^{-1}$. We construct an X-ray Luminosity function (XLF) and find that the local galaxy XLF, when including all AGN types, can be represented as a single power-law of slope $-0.54\pm 0.06$. The Eddington ratio of the Seyferts is usually 2-4 decades higher than that of the LINERs, ALGs and HII galaxies, which are mostly detected with Eddington ratios <10${}^{-3}$. Using [O III] line measurements and BH masses from the literature, we show that LINERs, HII galaxies and ALGs follow similar correlations to low luminosities, suggesting that some 'inactive' galaxies may harbour AGN.

20 pages + 42 pages of online supplementary material 15 figures, 7 tables (additional 150 figures and 6 tables in online supplementary material) Accepted for publication in MNRAS, 15th November 2021

References in corpus (25)

• The Host Galaxies and Classification of Active Galactic Nuclei
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• The MAPPINGS III Library of Fast Radiative Shock Models
• Toward the Standard Population Synthesis Model of the X-Ray Background: Evolution of X-Ray Luminosity and Absorption Functions of Active Galactic Nuclei Including Compton-Thick Populations
• On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies
• Swift BAT Survey of AGN
• Unification of the Fundamental Plane and Super-Massive Black Holes Masses
• The Hard X-ray Spectral Slope as an Accretion-Rate Indicator in Radio-Quiet Active Galactic Nuclei
• The X-ray and Radio Connection in Low-luminosity Active Nuclei
• Low-Luminosity Active Galactic Nuclei: Are They UV-Faint and Radio Loud?
• The accretion mechanism in low-power radio galaxies
• A Search for "Dwarf" Seyfert Nuclei. VII. A Catalog of Central Stellar Velocity Dispersions of Nearby Galaxies
• X-ray nature of the LINER nuclear sources
• Black hole scaling relations of active and quiescent galaxies: Addressing selection effects and constraining virial factors
• The Fundamental Plane of Black Hole Activity in the Optical Band
• Chandra Survey of Nearby Galaxies: The Catalog
• Cumulative hard X-ray spectrum of local AGN: a link to the cosmic X-ray background
• On the LINER nuclear obscuration, Compton-thickness and the existence of the dusty torus; Clues from Spitzer/IRS spectra
• LeMMINGs. II. The e-MERLIN legacy survey of nearby galaxies. The deepest radio view of the Palomar sample on parsec scale
• X-ray spectral variability of LINERs selected from the Palomar sample
• X-ray bolometric corrections for Compton-thick active galactic nuclei
• A hard look at local, optically-selected, obscured Seyfert galaxies
• NuSTAR Uncovers an Extremely Local Compton-thick AGN in NGC 4968
• LeMMINGs. III. The e-MERLIN Legacy Survey of the Palomar sample. Exploring the origin of nuclear radio emission in active and inactive galaxies through the [O III] -- radio connection
• A hard look at NGC 5347: revealing a nearby Compton-thick AGN

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• A Cigale module tailored (not only) for Low-Luminosity AGN
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• LeMMINGs. VI. Connecting nuclear activity to bulge properties of active and inactive galaxies: radio scaling relations and galaxy environment
• LeMMINGs. V. Nuclear activity and bulge properties: a detailed multi-component decomposition of $e$-MERLIN Palomar galaxies with $HST$
• Cosmic quenching and scaling laws for the evolution of supermassive black holes and host galaxies
• The LeMMINGs survey: probing sub-kpc radio structures of nearby galaxies with e-MERLIN
• GalSBI-SPS: a stellar population synthesis-based galaxy population model for cosmology and galaxy evolution applications
• Are Active Galactic Nuclei in Post-Starburst Galaxies Driving the Change or Along for the Ride?