The Activity of the Neighbours of Seyfert Galaxies

Abstract

We present a follow-up study on a series of papers concerning the role of close interactions as a possible triggering mechanism of AGN activity. We have already studied the close (<100kpc/h) and the large scale (<1 Mpc/h) environment of a local sample of Sy1, Sy2 and bright IRAS galaxies (BIRG) and their respective control samples. The results led us to the conclusion that a close encounter appears capable of activating a sequence where an absorption line galaxy (ALG) galaxy becomes first a starburst, then a Sy2 and finally a Sy1. Here we investigate the activity of neighboring galaxies of different types of AGN, since both galaxies of an interacting pair should be affected. To this end we present the optical spectroscopy and X-ray imaging of 30 neighbouring galaxies around two local (z<0.034) samples of 10 Sy1 and 13 Sy2 galaxies. Based on the optical spectroscopy we find that more than 70% of all neighbouring galaxies exhibit star forming and/or nuclear activity (namely recent star formation and/or AGN), while an additional X-ray analysis showed that this percentage might be significantly higher. Furthermore, we find a statistically significant correlation, at a 99.9% level, between the value of the neighbour's [OIII]/Hβratio and the activity type of the central active galaxy, i.e. the neighbours of Sy2 galaxies are systematically more ionized than the neighbours of Sy1s. This result, in combination with trends found using the Equivalent Width of the Hαemission line and the stellar population synthesis code STARLIGHT, indicate differences in the stellar mass, metallicity and star formation history between the samples. Our results point towards a link between close galaxy interactions and activity and also provide more clues regarding the possible evolutionary sequence inferred by our previous studies.

Accepted for publication in A&A. 17 pages, 4 figures. arXiv admin note: substantial text overlap with arXiv:0910.1355v1 (withdrawn)

References in corpus (25)

• The Host Galaxies and Classification of Active Galactic Nuclei
• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• Galaxy Pairs in the Sloan Digital Sky Survey I: Star Formation, AGN Fraction, and the Luminosity/Mass-Metallicity Relation
• The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue
• The bulk of the black hole growth since z~1 occurs in a secular universe: No major merger-AGN connection
• Galaxy pairs in the Sloan Digital Sky Survey - IV: Interactions trigger AGN
• Absorption Properties and Evolution of Active Galactic Nuclei
• Clearing Out a Galaxy
• Observational evidence of quasar feedback quenching star formation at high redshift
• Unveiling obscured accretion in the Chandra Deep Field South
• The impact of galaxy interactions on AGN activity in zCOSMOS
• Is AGN feedback necessary to form red elliptical galaxies?
• Interactions, star formation and AGN activity
• The H alpha Galaxy Survey. VIII. Close companions and interactions, and the definition of starbursts
• The XMM-Newton serendipitous survey IV. The AXIS X-ray source counts and angular clustering
• Compact massive objects in Virgo galaxies: the black hole population
• A 3-Dimensional study of the Local Environment of Bright IRAS Galaxies: The AGN/Starburst connection
• XMM-Newton View of the Multi-Phase Warm Absorber in Seyfert 1 Galaxy NGC985
• The SEDs, Host Galaxies and Environments of Variability Selected AGN in GOODS-S
• Why are AGN found in High Mass Galaxies?
• Prevalence of Tidal Interactions among Local Seyfert Galaxies: The Control Experiment
• The Role of Galaxy Interaction in Environmental Dependence of the Star Formation Activity at z~1.2
• Properties of X-ray selected Broad Absorption Line Quasars
• The environment of AGNs and the activity degree of their surrounding galaxies
• Do stellar winds play a decisive role in feeding AGN?

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• The XXL survey XXXV. The role of cluster mass in AGN activity
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• The cosmic web of X-ray active galactic nuclei seen through the eROSITA Final Equatorial Depth Survey (eFEDS)
• X-ray AGN in the XMM-LSS galaxy clusters: no evidence of AGN suppression
• XXL-HSC: The link between AGN activity and star formation in the Early Universe ($z⩾3.5$)
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• Emission Line Galaxies and Active Galactic Nuclei in WINGS clusters
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• AGNs in Small Galaxy Systems: comparing the main properties of active objects in pairs, triplets and groups
• XXL Survey XXI. The environment and clustering of X-ray AGN in the XXL-South field
• Galaxy Mergers in the Epoch of Reionization II: Major Merger-Triggered Star Formation and AGN Activities at $z=$ 4.5-8.5
• The XMM spectral catalog of SDSS optically selected Seyfert 2 galaxies
• XXL-HSC: Host properties of X-ray detected AGNs in XXL clusters
• A study of interacting galaxies from the Arp-Madore Catalogue: Triggering of star formation and nuclear activity
• Enhanced AGN Activity in Overdense Galactic Environments at $2<z<4$
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