THE X-RAY ZURICH ENVIRONMENTAL STUDY (X-ZENS). I.CHANDRAANDXMM-NEWTONOBSERVATIONS OF ACTIVE GALACTIC NUCLEI IN GALAXIES IN NEARBY GROUPS

Silverman, John D.; Miniati, Francesco; Finoguenov, A.; Carollo, C. M.; Cibinel, A.; Lilly, S. J.; Schawinski, Kevin

doi:10.1088/0004-637x/780/1/67

Cited by 8 publications

(5 citation statements)

References 80 publications

(134 reference statements)

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“…This is inconsistent with the notion that AGN are predominantly in central galaxies (e.g., Starikova et al 2011;Richardson et al 2013), as our results suggest a significant fraction of AGN are in satellites. This agrees with several recent studies (Allevato et al 2012;Oh et al 2014;Silverman et al 2014). Additionally, using a subhalo-based model that corrects for catalog incompleteness, we find that the host galaxy stellar mass distribution can determine the environments of AGN on average, via the stellar mass-subhalo mass relation (Behroozi et al 2010).…”

Section: Environments Of Local Agnsupporting

confidence: 91%

The Swift/BAT AGN Spectroscopic Survey. IX. The Clustering Environments of an Unbiased Sample of Local AGNs

Powell

Cappelluti

Urry

et al. 2018

ApJ

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We characterize the environments of local accreting supermassive black holes by measuring the clustering of AGN in the Swift/BAT Spectroscopic Survey (BASS). With 548 AGN in the redshift range 0.01 < z < 0.1 over the full sky from the DR1 catalog, BASS provides the largest, least biased sample of local AGN to date due to its hard X-ray selection (14-195 keV) and rich multiwavelength/ancillary data. By measuring the projected cross-correlation function between the AGN and 2MASS galaxies, and interpreting it via halo occupation distribution and subhalo-based models, we constrain the occupation statistics of the full sample, as well as in bins of absorbing column density and black hole mass. We find that AGN tend to reside in galaxy group environments, in agreement with previous studies of AGN throughout a large range of luminosity and redshift, and that on average they occupy their dark matter halos similar to inactive galaxies of comparable stellar mass. We also find evidence that obscured AGN tend to reside in denser environments than unobscured AGN, even when samples were matched in luminosity, redshift, stellar mass, and Eddington ratio. We show that this can be explained either by significantly different halo occupation distributions or statistically different host halo assembly histories. Lastly, we see that massive black holes are slightly more likely to reside in central galaxies than black holes of smaller mass.

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Section: Environments Of Local Agnsupporting

confidence: 91%

The Swift/BAT AGN Spectroscopic Survey. IX. The Clustering Environments of an Unbiased Sample of Local AGNs

Powell

Cappelluti

Urry

et al. 2018

ApJ

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“…The insensitivity of AGNs to the host group's mass has previously been noted (Padilla et al 2010). Li et al (2006) and Silverman et al (2014) find a higher prevalence of AGNs in the cluster's central galaxy. The cluster center in our study is not the same, however, and the effect may be washed out by the satellite population.…”

Section: Discussionmentioning

confidence: 64%

Changing Ionization Conditions in SDSS Galaxies With Active Galactic Nuclei as a Function of Environment From Pairs to Clusters

Khabiboulline

Steinhardt

Silverman

et al. 2014

ApJ

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We study how active galactic nucleus (AGN) activity changes across environments from galaxy pairs to clusters using 143,843 galaxies with z < 0.2 from the Sloan Digital Sky Survey. Using a refined technique, we apply a continuous measure of AGN activity, characteristic of the ionization state of the narrow-line emitting gas. Changes in key emission-line ratios ([N ii] λ6548/Hα, [O iii] λ5007/Hβ) between different samples allow us to disentangle different environmental effects while removing contamination. We confirm that galaxy interactions enhance AGN activity. However, conditions in the central regions of clusters are inhospitable for AGN activity even if galaxies are in pairs. These results can be explained through models of gas dynamics in which pair interactions stimulate the transfer of gas to the nucleus and clusters suppress gas availability for accretion onto the central black hole.

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“…In particular we present data taken during the past few years with the XMM-N ewton and Chandra telescopes on a subsample of ZENS groups. In this paper we focus on the diffuse X-ray emission while we report on the X-ray pointsorce detections in a companion paper (Silverman et al 2014) aimed at investigating the role of AGN in the context of galaxy evolution in groups.…”

Section: Introductionmentioning

confidence: 99%

The X-Ray Zurich Environmental Study (X-Zens). Ii. X-Ray Observations of the Diffuse Intragroup Medium in Galaxy Groups

Miniati

Finoguenov

Silverman

et al. 2016

ApJ

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We present the results of a pilot XMM-N ewton and Chandra program aimed at studying the diffuse intragroup medium (DIM) of optically-selected nearby groups from the Zurinch ENvironmental Study (ZENS) catalog. The groups are in a narrow mass range about 10 13 M ⊙ , a mass scale at which the interplay between the DIM and the group member galaxies is still largely unprobed. X-ray emission from the DIM is detected in the energy band 0.5-2 keV with flux ≤ 10 −14 erg cm −1 s −1 , which is one order of magnitude fainter than for typical ROSAT groups (RASS). For many groups we set upper limits to the X-ray luminosity, indicating that the detections are likely probing the upper envelope of the X-ray emitting groups. We find evidence for our optically selected groups to be under-luminous with respect to predictions from X-ray scaling relations. X-ray mass determinations are in best agreement with those based on the member galaxies bulge luminosity, followed by their total optical luminosity and velocity dispersion. We measure a stellar mass fraction with a median value of about 1%, with a contribution from the most massive galaxies between 30 to 50 %. Optical and X-ray data give often complementary answers concerning the dynamical state of the groups, and are essential for a complete picture of the system. Extending this pilot program to a larger sample of groups is mandatory to unveil any imprint of interaction between member galaxies and DIM in halo potentials of key importance for environmentally-driven galactic evolution.

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THE X-RAY ZURICH ENVIRONMENTAL STUDY (X-ZENS). I.CHANDRAANDXMM-NEWTONOBSERVATIONS OF ACTIVE GALACTIC NUCLEI IN GALAXIES IN NEARBY GROUPS

Cited by 8 publications

References 80 publications

The Swift/BAT AGN Spectroscopic Survey. IX. The Clustering Environments of an Unbiased Sample of Local AGNs

The Swift/BAT AGN Spectroscopic Survey. IX. The Clustering Environments of an Unbiased Sample of Local AGNs

Changing Ionization Conditions in SDSS Galaxies With Active Galactic Nuclei as a Function of Environment From Pairs to Clusters

The X-Ray Zurich Environmental Study (X-Zens). Ii. X-Ray Observations of the Diffuse Intragroup Medium in Galaxy Groups

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