NoSOCS in SDSS - VI. The environmental dependence of AGN in clusters and field in the local Universe

被引:43
作者
Lopes, P. A. A. [1 ,2 ,3 ]
Ribeiro, A. L. B. [4 ]
Rembold, S. B. [5 ]
机构
[1] Univ Fed Rio de Janeiro, Observ Valongo, Ladeira do Pedro Antonio 42, BR-20080090 Rio De Janeiro, RJ, Brazil
[2] Sorbonne Univ, CNRS, UMR 7095, Inst Astrophys Paris, 98 Bis Bd Arago, F-75014 Paris, France
[3] Sorbonne Univ, UPMC, 98 Bis Bd Arago, F-75014 Paris, France
[4] Univ Estadual Santa Cruz, Dept Ciencias Exatas & Tecnol, Lab Astrofis Teor & Observac, BR-45650000 Ilheus, BA, Brazil
[5] Univ Fed Santa Maria, BR-97105900 Santa Maria, RS, Brazil
基金
美国国家航空航天局; 美国国家科学基金会;
关键词
surveys; galaxies: clusters: general; galaxies: evolution; ACTIVE GALACTIC NUCLEI; DIGITAL SKY SURVEY; SUPERMASSIVE BLACK-HOLES; GALAXY CLUSTERS; STAR-FORMATION; HOST GALAXIES; RICH CLUSTERS; STELLAR MASS; SURVEY DPOSS; EVOLUTION;
D O I
10.1093/mnras/stx2046
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigated the variation in the fraction of optical active galactic nuclei (AGNs) hosts with stellar mass, as well as their local and global environments. Our sample is composed of cluster members and field galaxies at z <= 0.1 and we consider only strong AGN. We find a strong variation in the AGN fraction (F-AGN) with stellar mass. The field population comprises a higher AGN fraction compared to the global cluster population, especially for objects with log M-* > 10.6. Hence, we restricted our analysis to more massive objects. We detected a smooth variation in the F-AGN with local stellar mass density for cluster objects, reaching a plateau in the field environment. As a function of cluster-centric distance we verify that F-AGN is roughly constant for R > R-200, but show a steep decline inwards. We have also verified the dependence of the AGN population on cluster velocity dispersion, finding a constant behaviour for low mass systems (sigma(P) less than or similar to 650-700 km s(-1)). However, there is a strong decline in F-AGN for higher mass clusters (> 700 km s(-1)). When comparing the F-AGN in clusters with or without substructure, we only find different results for objects at large radii (R > R-200), in the sense that clusters with substructure present some excess in the AGN fraction. Finally, we have found that the phase-space distribution of AGN cluster members is significantly different than other populations. Due to the environmental dependence of F-AGN and their phase-space distribution, we interpret AGN to be the result of galaxy interactions, favoured in environments where the relative velocities are low, typical of the field, low mass groups or cluster outskirts.
引用
收藏
页码:409 / 418
页数:10
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