Radio continuum morphology of southern Seyfert galaxies

被引:80
作者
Morganti, R
Tsvetanov, ZI
Gallimore, J
Allen, MG
机构
[1] CNR, Ist Radioastron, I-40129 Bologna, Italy
[2] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[3] Natl Radio Astron Observ, Charlottesville, VA 22903 USA
[4] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Weston, ACT 2611, Australia
来源
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES | 1999年 / 137卷 / 03期
关键词
radio continuum : galaxies; galaxies : Seyfert;
D O I
10.1051/aas:1999258
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present radio observations for 29 southern Seyfert galaxies selected from a volume limited sample with cz < 3600 km s(-1), and declination delta < 0 degrees. Objects with declination -30 degrees < delta < 0 degrees were observed with the Very Large Array (VLA) at 6 cm (4.9 GHz) and objects with delta < -30 degrees were observed with the Australia Telescope Compact Array (ATCA) at 3.5 cm (8.6 GHz). Both the VLA and the ATCA observations have a resolution of similar to 1". These new observations cover more than 50% of the southern sample with all but two of the 29 objects detected above our limit of 0.15 mJy. Combining these data with data available from the literature gives almost 85% coverage of the southern sample and further expands the radio observations of a distance limited sample by 22%. Collecting additional sources from the literature, consisting of known Seyferts with cz < 4600 km s(-1), we find that 38% of the sources are unresolved at arcsecond resolution, and 34% have linear radio structure. Our results expand upon and are consistent with earlier studies. We confirm a correlation between the size of the radio structure and the radio luminosity. A comparison between Seyfert types 1 and 2 finds that type 2s tend to have a larger linear size. There is no statistically significant difference in radio power between types 1 and 2, although all the most powerful objects appear to be Seyfert 2's. No significant difference has been found in the spectral indices.
引用
收藏
页码:457 / 471
页数:15
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