Circumnuclear Star Forming Activity in NGC 3982

Circumnuclear Star Forming Activity in NGC 3982
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NGC 3982 中的核周恒星形成活动

DOI:
10.1088/1009-9271/8/5/06
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发表时间:
2008-10
期刊:
CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
影响因子:
--
通讯作者:
Wang Y.P.
Wang Y.P.
中科院分区:
其他
文献类型:
--
作者:
Zhang R.N.;Gu Q.S.;Wang Y.P.

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我们利用 SDSS、斯皮策和钱德拉获得的光学、红外和 X 射线数据对附近的塞弗特星系 NGC 3982 进行了研究。我们的主要结果如下:(1)核和核周SDSS光谱上的简单恒星族合成给出了核和核周区域年轻恒星成分的明确证据。 (2)中心区域(~3'')的斯皮策红外光谱仪(IRS)光谱显示出幂律连续谱,在9.7 μm处有硅酸盐发射特征,在7.7、8.6、11.3和12.7 μm处有显着的PAH发射特征,表明NGC 3982中心区域活动星系核和星暴活动共存。(3)我们估计了恒星形成速率从 Hα 光度计算核周(~5''−20'')区域的恒星形成率(SFR)为 SFRHα = 0.52 M⊙ yr−1,这与 Spitzer IRAC 8 μm 光度的结果 SFR8.0 μm = 0.57 M⊙ yr−1 一致。 (4) 我们测量了NGC 3982活性核从射电到X射线的光谱能量分布,得到了Lbol = 4.5×1042 erg s−1的辐射光度,对应于0.014的爱丁顿比(Lbol/LEdd)。 NGC 3982的HST图像显示核周恒星形成区和核之间有一个核微型螺旋,这可能是气体从核周恒星形成区输送到超大质量黑洞的通道。
We present a study of the nearby Seyfert galaxy NGC 3982 using optical, infrared and X-ray data acquired by SDSS, Spitzer and Chandra. Our main results are as follows: (1) A simple stellar population synthesis on the nuclear and circumnuclear SDSS spectra gives unambiguous evidence of young stellar components in both the nuclear and circumnuclear regions. (2) The Spitzer Infrared Spectrograph (IRS) spectrum of the central region (~3'') shows a power-law continuum, a silicate emission feature at 9.7 μm, and significant PAH emission features at 7.7, 8.6, 11.3 and 12.7 μm, suggesting the coexistence of AGN and starburst activities in the central region of NGC 3982. (3) We estimate the star formation rate (SFR) of the circumnuclear (~5''−20'') region from the Hα luminosity to be SFRHα = 0.52 M⊙ yr−1, which is consistent with the result from the Spitzer IRAC 8 μm luminosity, SFR8.0 μm = 0.57 M⊙ yr−1. (4) We measure the spectral energy distribution for the active nucleus of NGC 3982 from radio to X-ray, and obtain a bolometric luminosity of Lbol = 4.5×1042 erg s−1, corresponding to an Eddington ratio (Lbol/LEdd) of 0.014. The HST image of NGC 3982 shows a nuclear mini-spiral between the circumnuclear star-forming region and the nucleus, which could be the channel through which gas is transported to the supermassive black hole from the circumnuclear star-forming region.
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