Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Söchting, Ilona K."'
Autor:
Raghunathan, Srinivasan, Clowes, Roger G., Campusano, Luis E., Söchting, Ilona K., Graham, Matthew J., Williger, Gerard M.
Publikováno v:
MNRAS 463 (2016) 2640-2652
We present the catalogue of the Mg II absorption systems detected at a high significance level using an automated search algorithm in the spectra of quasars from the twelfth data release of the Sloan Digital Sky Survey. A total of 266,433 background
Externí odkaz:
http://arxiv.org/abs/1608.05112
Autor:
Clowes, Roger G., Haberzettl, Lutz, Raghunathan, Srinivasan, Williger, Gerard M., Mitchell, Sophia M., Soechting, Ilona K., Graham, Matthew J., Campusano, Luis E.
We investigate the strength of ultraviolet Fe II emission in fainter quasars compared with brighter quasars for 1.0 <= z <= 1.8, using the SDSS (Sloan Digital Sky Survey) DR7QSO catalogue and spectra of Schneider et al., and the SFQS (SDSS Faint Quas
Externí odkaz:
http://arxiv.org/abs/1604.08411
Autor:
Marinello, Gabriel E., Clowes, Roger G., Campusano, Luis E., Williger, Gerard M., Söchting, Ilona K., Graham, Matthew J.
Publikováno v:
MNRAS (September 21, 2016) 461 (3): 2267-2281
We study the compatibility of large quasar groups with the concordance cosmological model. Large Quasar Groups are very large spatial associations of quasars in the cosmic web, with sizes of 50-250h^-1 Mpc. In particular, the largest large quasar gro
Externí odkaz:
http://arxiv.org/abs/1603.03260
Autor:
Coldwell, Georgina V., Gurovich, Sebastian, Tello, Jorge Diaz, Soechting, Ilona K., Lambas, Diego G.
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 c
Externí odkaz:
http://arxiv.org/abs/1310.2618
Autor:
Clowes, Roger G., Raghunathan, Srinivasan, Soechting, Ilona K., Graham, Matthew J., Campusano, Luis E.
We have investigated the strength of ultraviolet Fe II emission from quasars within the environments of Large Quasar Groups (LQGs) in comparison with quasars elsewhere, for 1.1 <= <= 1.7, using the DR7QSO catalogue of the Sloan Digital Sky Su
Externí odkaz:
http://arxiv.org/abs/1304.7396
Autor:
Clowes, Roger G., Harris, Kathryn A., Raghunathan, Srinivasan, Campusano, Luis E., Soechting, Ilona K., Graham, Matthew J.
A Large Quasar Group (LQG) of particularly large size and high membership has been identified in the DR7QSO catalogue of the Sloan Digital Sky Survey. It has characteristic size (volume^1/3) ~ 500 Mpc (proper size, present epoch), longest dimension ~
Externí odkaz:
http://arxiv.org/abs/1211.6256
The Clowes & Campusano (1991) Large Quasar Group (LQG) at = 1.28 has been re-examined using the quasar data from the DR7QSO catalogue of the Sloan Digital Sky Survey. In the 1991 discovery, the LQG impinged on the northern, southern and eastern l
Externí odkaz:
http://arxiv.org/abs/1108.6221
We analyse the relation between AGN host properties and large scale environment for a representative red and blue AGN host galaxy sample selected from the DR4 SDSS. A comparison is made with two carefully constructed control samples of non-active gal
Externí odkaz:
http://arxiv.org/abs/0906.4090
Publikováno v:
Mon.Not.Roy.Astron.Soc.369:1334-1350,2006
We describe a large sample of 598 galaxy clusters and rich groups discovered in the data of the Faint Sky Variability Survey. The clusters have been identified using a fully automated, semi-parametric technique based on a maximum likelihood approach
Externí odkaz:
http://arxiv.org/abs/astro-ph/0604610
We are looking at quasar environment in the context of large-scale structure (LSS) - a new approach, giving a more informed interpretation of quasar-galaxy correlations. This paper presents our first results for a sample of z ~ 0.3 quasars. We are us
Externí odkaz:
http://arxiv.org/abs/astro-ph/0111115