Evidence for an outflow from the Seyfert galaxy NGC 4051

被引:61
作者
Christopoulou, PE
Holloway, AJ
Steffen, W
Mundell, CG
Thean, AHC
Goudis, CD
Meaburn, J
Pedlar, A
机构
[1] UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS & ASTRON,MANCHESTER M13 9PL,LANCS,ENGLAND
[2] UNIV MANCHESTER,NUFFIELD RADIO ASTRON LABS,JODRELL BANK,MACCLESFIELD SK11 9DL,CHESHIRE,ENGLAND
关键词
galaxies; active; individual; NGC4051; jets; kinematics and dynamics; Seyfert; radio continuum;
D O I
10.1093/mnras/284.2.385
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
New observations using narrow-band imaging, long-slit spectroscopy and MERLIN observations of the nuclear region of the Seyfert galaxy NGC 4051 have been made. An edge-brightened, triangular region of ionized gas extending 420 pc from the centre of the galaxy has been detected. Long-slit spectra of this ionized gas, taken at 1.5 arcsec from the core, show the [O III] 5007-Angstrom emission line to consist of two velocity components, both blueshifted from the systemic radial velocity, with velocity widths of 140 km s(-1) and separated by 120 km s(-1). This region is co-spatial with weak extended radio emission, and is suggestive of a centrally driven outflow. The [O III] 5007-Angstrom line spectrum and image of this region are modelled as an outflowing conical structure at 50 degrees to the line of sight with a half-opening angle of 23 degrees. In addition to the extended structure, high-resolution MERLIN observations of the 18-cm nuclear radio emission reveal a compact (1 arcsec) radio triple source in PA 73 degrees. This source is coincident with the HST-imaged emission-line structure. These high-resolution observations are consistent with a more compact origin of activity (i.e., a Seyfert nucleus) than a starburst region.
引用
收藏
页码:385 / 394
页数:10
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