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26 April 2024 |
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Multiple AGN in the crowded field of the compact group SDSSJ0959+1259 | | Alessandra De Rosa
; Stefano Bianchi
; Tamara Bogdanovic
; Roberto Decarli
; Ruben Herrero-Illana
; Bernd Husemann
; Stefanie Komossa
; Emma Kun
; Nora Loiseau
; Zsolt Paragi
; Miguel Perez-Torres
; Enrico Piconcelli
; Kevin Schawinski
; Cristian Vignali
; | | Date: |
16 Jul 2015 | | Abstract: | We present a multi-wavelength study of a newly discovered compact group (CG),
SDSS J0959+1259, based data from XMM-Newton, SDSS and the Calar Alto optical
imager BUSCA. With a maximum velocity offset of 500 km s$^{-1}$, a mean
redshift of 0.035, and a mean spatial extension of 480 kpc, this CG is
exceptional in having the highest concentration of nuclear activity in the
local Universe, established with a sensitivity limit L$_{X}>4 imes $10$^{40}$
erg s$^{-1}$ in 2--10 keV band and R-band magnitude $M_R < -19$. The group is
composed of two type-2 Seyferts, one type-1 Seyfert, two LINERs and three star
forming galaxies. Given the high X-ray luminosity of LINERs which reaches $sim
10^{41}$ erg s$^{-1}$, it is likely that they are also accretion driven,
bringing the number of active nuclei in this group to to 5 out of 8 (AGN
fraction of 60\%). The distorted shape of one member of the CG suggests that
strong interactions are taking place among its galaxies through tidal forces.
Therefore, this system represents a case study for physical mechanisms that
trigger nuclear activity and star formation in CGs. | | Source: | arXiv, 1507.4517 | | Services: | Forum | Review | PDF | Favorites | |
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