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14 papers · 1 filter
Two more disk galaxies with global gas counterrotation
O. K. Sil'chenko, A. V. Moiseev, V. L. Afanasiev
We report a discovery of extended counterrotating gaseous disks in early-type disk galaxies NGC 2551 and NGC 5631. To find them, we have undertaken complex spectral observations in…
Long term optical and X-ray variability of the Seyfert galaxy Markarian 79
E. Breedt, P. Arévalo, I. M. McHardy +8
We present the results of concurrent X-ray and optical monitoring of the Seyfert 1 galaxy Mrk 79 over a period of more than five years. We find that on short to medium time-scales…
Balmer Emission Line Profiles and the Complex Properties of Broad Line Regions in Active Galactic Nuclei
G. La Mura, F. Di Mille, S. Ciroi +2
In this work we analyze a sample of AGN spectra, selected from the 6th Data Release of the Sloan Digital Sky Survey, exploiting a generalized technique of line profile analysis, de…
The WEBT Campaign on the Intermediate BL Lac Object 3C66A in 2007-2008
M. Boettcher, K. Fultz
Prompted by a high optical state in September 2007, the Whole Earth Blazar Telescope (WEBT) consortium organized an intensive optical, near-IR (JHK) and radio observing campaign on…
Results of WEBT, VLBA and RXTE monitoring of 3C 279 during 2006-2007
V. M. Larionov, S. G. Jorstad, A. P. Marscher +2
We present radio-to-optical data taken by the WEBT, supplemented by VLBA and RXTE observations, of 3C 279. Our goal is to use this extensive database to draw inferences regarding t…
Open clusters as key tracers of Galactic chemical evolution. III. Element abundances in Berkeley 20, Berkeley 29, Collinder 261, and Melotte 66
P. Sestito, A. Bragaglia, S. Randich +3
Galactic open clusters are since long recognized as one of the best tools for investigating the radial distribution of iron and other metals. We employed FLAMES at VLT to collect U…