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 r0 = 5.56-0.43 +0.49 Mpc h-1 and a slope γ = 1.64-0.07 -0.08. 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(MDMH)∼ 12-14 h-1M/M⊙, depending on the subsample. For the whole sample, we measured log(MDMH)∼ 13.15 h-1M/M⊙ which is the typical mass of a galaxy group.We estimated that the local AGN population has a typical lifetime τAGN ∼0.7 Gyr, it is powered by supermassive black hole with mass MBH∼ (1-10) × 108 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) × 1010 h-1M⊙.We compared our results with clustering predictions of merger-driven AGN triggering models and found a good agreement.
| Original language | English (US) |
|---|---|
| Pages (from-to) | L209-L213 |
| Journal | Astrophysical Journal Letters |
| Volume | 716 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jun 20 2010 |
| Externally published | Yes |
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Keywords
- Dark matter
- Diffuse radiation
- Galaxies: Active
- Large-scale structure of universe
- X-rays: Galaxies
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
Active galactic nuclei clustering in the local universe : An unbiased picture from swift-bat. / Cappelluti, Nico; Ajello, M.; Burlon, D.; Krumpe, M.; Miyaji, T.; Bonoli, S.; Greiner, J.
In: Astrophysical Journal Letters, Vol. 716, No. 2, 20.06.2010, p. L209-L213.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Active galactic nuclei clustering in the local universe
T2 - An unbiased picture from swift-bat
AU - Cappelluti, Nico
AU - Ajello, M.
AU - Burlon, D.
AU - Krumpe, M.
AU - Miyaji, T.
AU - Bonoli, S.
AU - Greiner, J.
PY - 2010/6/20
Y1 - 2010/6/20
N2 - 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 r0 = 5.56-0.43 +0.49 Mpc h-1 and a slope γ = 1.64-0.07 -0.08. 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(MDMH)∼ 12-14 h-1M/M⊙, depending on the subsample. For the whole sample, we measured log(MDMH)∼ 13.15 h-1M/M⊙ which is the typical mass of a galaxy group.We estimated that the local AGN population has a typical lifetime τAGN ∼0.7 Gyr, it is powered by supermassive black hole with mass MBH∼ (1-10) × 108 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) × 1010 h-1M⊙.We compared our results with clustering predictions of merger-driven AGN triggering models and found a good agreement.
AB - 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 r0 = 5.56-0.43 +0.49 Mpc h-1 and a slope γ = 1.64-0.07 -0.08. 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(MDMH)∼ 12-14 h-1M/M⊙, depending on the subsample. For the whole sample, we measured log(MDMH)∼ 13.15 h-1M/M⊙ which is the typical mass of a galaxy group.We estimated that the local AGN population has a typical lifetime τAGN ∼0.7 Gyr, it is powered by supermassive black hole with mass MBH∼ (1-10) × 108 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) × 1010 h-1M⊙.We compared our results with clustering predictions of merger-driven AGN triggering models and found a good agreement.
KW - Dark matter
KW - Diffuse radiation
KW - Galaxies: Active
KW - Large-scale structure of universe
KW - X-rays: Galaxies
UR - http://www.scopus.com/inward/record.url?scp=84887903979&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84887903979&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/716/2/L209
DO - 10.1088/2041-8205/716/2/L209
M3 - Article
AN - SCOPUS:84887903979
VL - 716
SP - L209-L213
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
ER -