The nuclear starburst activity in the Seyfert 2 galaxy NGC 7679

Free access article

Issue		A&A Volume 374, Number 3, August II 2001


Page(s)		932 - 935
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20010806

A&A 374, 932-935 (2001)
DOI: 10.1051/0004-6361:20010806

The nuclear starburst activity in the Seyfert 2 galaxy NGC 7679

Q. S. Gu¹, J. H. Huang¹, J. A. de Diego², D. Dultzin-Hacyan², S. J. Lei¹ and E. Benítez²

¹ Department of Astronomy, Nanjing University, Nanjing 210093, PR China
² Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo Postal 70-264, Mexico D.F. 04510, México

(Received 28 May 2001 / Accepted 5 June 2001)

Abstract
We present our recent spectrophotometric results of the infrared luminous Seyfert 2 galaxy NGC 7679. We find compelling evidence for the presence of a recent nuclear starburst, revealed by the observations of a) the spectral features of high order Balmer absorption lines, b) the weak equivalent widths for CaIIK $\lambda$ 3933, CN $\lambda$ 4200, G-band $\lambda$ 4300 and MgIb $\lambda$ 5173, and c) the suggested UV stellar wind resonance lines (N V $\lambda$ 1240, Si IV $\lambda$ 1400 and C IV $\lambda$ 1550) in the IUE spectrum. Using the simple stellar population synthesis model, we find that in the nuclear 2" $\times$ 2" region, the contributions from the old, intermediate and young components are 21.7% , 42.9% and 35.4% , respectively. These nuclear starburst activities might have been triggered by the close encounter with NGC 7682, as suggested by recent numerical simulations.

Key words: galaxies: active -- galaxies: Seyfert -- galaxies: starburst -- galaxies: stellar content

Offprint request: Q. S. Gu, qsgu@nju.edu.cn

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