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26 April 2024 |
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On the relation between Seyfert 2 accretion rate and environment at z < 0.1 | | Georgina V. Coldwell
; Sebastian Gurovich
; Jorge Diaz Tello
; Ilona K. Soechting
; Diego G. Lambas
; | | Date: |
9 Oct 2013 | | Abstract: | We analyse different properties of the small scale environment of Seyfert 2
for two samples selected according to the accretion rate parameter, R, from the
DR7-SDSS survey. We compare the results with two control samples of non-active
galaxies that cover the same redshift range, luminosity, colours, morphology,
age and stellar mass content. Our study shows that both high and low accretion
rate subsamples reside in bluer and lower density environments than the control
samples. However, we find that this difference is at least two times stronger
for the low accretion rate Seyferts.
In the vicinity of Seyfert 2, red galaxies have systematically lower values
of stellar-mass as compared with corresponding control samples. The lower
values of stellar mass for red neighbours is more significant at higher density
environments and it is more evident for low accretion rate Seyfert. We also
find that this effect is independent of the host’s stellar mass.
Our results are consistent with a scenario where AGN occurrence is higher in
lower/medium density environments with a higher merger rate and a lack of a
dense intergalactic medium (that can strip gas from these systems) that provide
suitable conditions for the central black hole feeding. We find this
particularly evident for the low accretion rate Seyferts that could compensate
through the intergalactic medium the lack of gas of their hosts. | | Source: | arXiv, 1310.2618 | | Services: | Forum | Review | PDF | Favorites | |
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