ACTIVE GALACTIC NUCLEI CLUSTERING IN THE LOCAL UNIVERSE: AN UNBIASED PICTURE FROM SWIFT -BAT

2010/05/27 by N. Cappelluti, M. Ajello, D. Burlon +5 · 4 citations
Physics and Astronomy · #Active galactic nucleus #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Black hole (networking) #Dark matter #Extragalactic astronomy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Halo #Luminosity #Physics #Population #Supermassive black hole #Universe #astro-ph.CO #astro-ph.HE

paper · pdf · doi:10.1088/2041-8205/716/2/l209

13 pages 3 figures, accepted by ApJ Letters

arxiv created 2010/05/27 · openalex publication_date 2010/06/04 · arxiv updated 2015/05/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06

Abstract

We present the clustering measurement of hard X-ray selected active galactic nuclei (AGNs) in the local universe. We used a sample of 199 sources spectroscopically confirmed, detected by Swift -BAT in its 15–55 keV all-sky survey. We measured the real space projected autocorrelation function (ACF) and detected a signal significant on projected scales lower than 200 Mpc h −1 . We measured a correlation length of r 0 = 5.56 +0.49 −0.43 Mpc h −1 and a slope γ = 1.64 −0.08 −0.07 . We also measured the ACF of Type I and Type II AGNs and found higher correlation length for Type I AGNs. We have a marginal evidence of luminosity dependent clustering of AGNs, as we detected a larger correlation length of luminous AGNs than that of low-luminosity sources. The corresponding typical host dark matter halo masses of Swift -BAT are ∼ log( M DMH )∼ 12–14 h −1 M / M ☉ , depending on the subsample. For the whole sample, we measured log( M DMH )∼ 13.15 h −1 M / M ☉ which is the typical mass of a galaxy group. We estimated that the local AGN population has a typical lifetime τ AGN ∼0.7 Gyr, it is powered by supermassive black hole with mass M BH ∼(1–10) × 10 8 M ☉ and accreting with very low efficiency, log( )∼−2.0. We also conclude that local AGN host galaxies are typically red-massive galaxies with stellar mass of the order (2–80) × 10 10 h −1 M ☉ . We compared our results with clustering predictions of merger-driven AGN triggering models and found a good agreement.

Citations

• A Physical Model for the Origin of Quasar Lifetimes
• The Demography of Massive Dark Objects in Galaxy Centers
• THE 22 MONTH SWIFT -BAT ALL-SKY HARD X-RAY SURVEY
• THE SPATIAL CLUSTERING OFROSATALL-SKY SURVEY AGNs. I. THE CROSS-CORRELATION FUNCTION WITH SDSS LUMINOUS RED GALAXIES
• THE EVOLUTION OFSWIFT/BAT BLAZARS AND THE ORIGIN OF THE MeV BACKGROUND
• AEGIS: THE CLUSTERING OF X-RAY ACTIVE GALACTIC NUCLEUS RELATIVE TO GALAXIES ATz∼ 1
• A survey of galaxy redshifts. V - The two-point position and velocity correlations
• On the Mass‐to‐Light Ratio of Large‐Scale Structure
• Reliability of the Dark Matter Clustering in CosmologicalN‐Body Simulations on Scales below the Mean Separation Length of Particles
• Simulations of the formation, evolution and clustering of galaxies and quasars

Cited by

• The cosmic web of X-ray active galactic nuclei seen through the eROSITA Final Equatorial Depth Survey (eFEDS)
• Clustering, cosmology and a new era of black hole demographics– II. The conditional luminosity functions of Type 2 and Type 1 active galactic nuclei
• Clustering, cosmology and a new era of black hole demographics– I. The conditional luminosity function of active galactic nuclei
• THE SPATIAL CLUSTERING OFROSATALL-SKY SURVEY ACTIVE GALACTIC NUCLEI. IV. MORE MASSIVE BLACK HOLES RESIDE IN MORE MASSIVE DARK MATTER HALOS