Na I D Lines in the SN 2002ap Spectrum
Na I D Lines in the SN 2002ap Spectrum
复制标题
SN 2002ap 光谱中的 Na I D 谱线
DOI：
10.1093/pasj/54.6.899
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发表时间：
2002
影响因子：
2.3
通讯作者：
Gang Zhao
中科院分区：
文献类型：
--
作者：
M. Takada;W. Aoki;Gang Zhao
利用Subaru望远镜的高色散光谱仪在4120-6860 μ A波长范围内对M74中的SN 2002 ap进行了高色散、高信噪比的光谱观测。在高色散阶梯光谱中，没有发现与SN 2002 ap本身相关的发射和吸收特征，但在与M74圆盘对应的红移处检测到一对Na I D1和D2吸收线，并且发现每个吸收线都显示出三个分量。对于第一、第二和第三组分，这些组分的柱密度分别为log N（NaI）= 11.47、10.47和10.72。M74的星际红化是根据这些成分估算出来的，并与银河系的红化相结合，得出沿SN 2002 ap的视线方向的总E（B − V）=0. 09 ± 0. 01沿着。
High-dispersion, high-S/N spectroscopic observations of SN2002ap in M74 were carried out in the wavelength range of 4120–6860 u A using the High Dispersion Spectrograph of the Subaru Telescope. Neither emission nor absorption features relating to SN2002ap itself were identified in the high-dispersion echelle spectrum, but a pair of Na I D1 and D2 absorption lines were detected at a redshift corresponding to the disk of M74, and each was found to show three components. The column densities of these components are log N(NaI )=1 1.47, 10.47, and 10.72 for the first, second, and third components, respectively. The interstellar reddening in M74 was estimated from these components, and was combined with that in the Galaxy to yield a total value of E(B − V )=0 .09 ±0.01 along the line of sight to SN2002ap.