arXiv 1801.048602018-01-15astro-ph.GA

Mrk848中空间分辨的恒星形成和尘埃衰减：积分场光谱和紫外-红外SED的比较

Spatially resolved star formation and dust attenuation in Mrk848: Comparison of the integral field spectra and the UV-to-IR SED

F. -T. Yuan, M. Argudo-Fernandez, S. Shen, L. Hao, C. Jiang, J. Yin, M. Boquien, L. Lin

备注：: 16 pages, 16 figures, A&A accepted
发表信息：: A&A 613, A13 (2018)
DOI：: 10.1051/0004-6361/201731865

阅读 PDF

arXiv 页面 ↗HTML 原文 ↗

摘要：

我们研究了星系合并Mrk 848中的恒星形成历史和尘埃衰减。得益于从紫外（UV）到红外（IR）的多波长光度学和MaNGA的积分场光谱学，我们能够详细研究这种合并。我们将整个合并过程分为核心区和尾部区，并分别对各个区域的光谱和多波段光谱能量分布（SED）进行拟合，得到了各个区域的恒星形成特性。我们发现，在星系$E(B-V)_s^{SED}$测量的多波段SED拟合的颜色过剩的恒星是一致的，从红外过剩（红外与紫外光通量的比率）和从紫外连续光谱的斜率估计。此外，$E(B-V)_s^{SED}$的可靠性进行了检查与一组模拟SED，表明尘埃衰减的恒星可以很好地约束紫外到红外宽带SED拟合。由光学连续谱$E(B-V)_s^{spec}$得到的尘埃衰减只有$E(B-V)_s^{SED}$的一半左右。从巴耳末减量获得的$E(B-V)_s^{spec}$与$E(B-V)_g$的比率与局部值（约0.5）一致。从紫外到红外数据和光学数据的结果之间的差异是一致的图片，年轻的恒星星族被衰减的额外的尘埃成分从出生云相比，老恒星星族，这是只衰减的弥漫尘埃。通过紫外-红外光谱拟合和光谱拟合，我们发现在两个核心区域中的一个区域存在一个年龄小于100~Myr的星暴，这与相互作用引起的气体流入能够促进星系中心恒星形成的假设相一致。

英文摘要：

We investigate the star formation history and the dust attenuation in the galaxy merger Mrk848. Thanks to the multiwavelength photometry from the ultraviolet (UV) to the infrared (IR), and MaNGA's integral field spectroscopy, we are able to study this merger in a detailed way. We divide the whole merger into the core and tail regions, and fit both the optical spectrum and the multi-band spectral energy distribution (SED) to models to obtain the star formation properties for each region respectively. We find that the color excess of stars in the galaxy $E(B-V)_s^{SED}$ measured with the multi-band SED fitting is consistent with that estimated both from the infrared excess (the ratio of IR to UV flux) and from the slope of the UV continuum. Furthermore, the reliability of the $E(B-V)_s^{SED}$ is examined with a set of mock SEDs, showing that the dust attenuation of the stars can be well constrained by the UV-to-IR broadband SED fitting. The dust attenuation obtained from optical continuum $E(B-V)_s^{spec}$ is only about half of $E(B-V)_s^{SED}$. The ratio of the $E(B-V)_s^{spec}$ to the $E(B-V)_g$ obtained from the Balmer decrement is consistent with the local value (around 0.5). The difference between the results from the UV-to-IR data and the optical data is consistent with the picture that younger stellar populations are attenuated by an extra dust component from the birth clouds compared to older stellar populations which are only attenuated by the diffuse dust. Both with the UV-to-IR SED fitting and the spectral fitting, we find that there is a starburst younger than 100~Myr in one of the two core regions, consistent with the scenario that the interaction-induced gas inflow can enhance the star formation in the center of galaxies.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文