Multiwavelength Bulge–Disk Decomposition for the Galaxy M81 (NGC 3031). I. Morphology
Multiwavelength Bulge–Disk Decomposition for the Galaxy M81 (NGC 3031). I. Morphology
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Galaxy M81 的多波长凸出 - 圆盘分解 (NGC 3031)。
DOI：
10.3847/1538-4365/acd554
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Sijie Yu
中科院分区：
文献类型：
--
作者：
Jun Gong;Y. Mao;Hua Gao;Sijie Yu
本文提出了对早期型螺旋星系 M81 形态的全色研究。我们对使用 GALEX、Swift、斯隆数字巡天、WIYN、两微米全巡天、广域红外巡天探测器和 Spitzer 获得的从远紫外到近红外 (NIR) 的总共 20 个波段的 M81 图像进行了凸块盘分解。由此推导了所有波段的核球和星系盘的Sérsic指数、有效半径、位置角和轴比等形态参数，这使得能够量化M81的形态K校正，并使得在任何波段再现星系核球和星系盘的图像成为可能。作为波长函数的形态表现为 Sérsic 指数和有效半径的可变斜率趋势，其中变化在紫外-光学波段陡峭，而在光学-近红外波段变化较浅；位置角和轴比至少在光学-近红外波段保持不变。值得注意的是，凸起的 Sérsic 指数在光学和近红外波段达到~4-5，但在紫外波段下降到~1。这种差异提出了一个警告，即在使用光学望远镜通过静止框架紫外通道观察星系的高红移情况下，经典核球可能会被误认为是伪核球或无核球。该系列的下一步工作计划分别研究核球和盘的空间分辨光谱能量分布，从而探索由子系统组成的星系的星族特性和恒星形成/猝灭历史。
A panchromatic investigation of morphology for the early-type spiral galaxy M81 is presented in this paper. We perform bulge–disk decomposition in M81 images at a total of 20 wave bands from far-UV to near-IR (NIR) obtained with GALEX, Swift, Sloan Digital Sky Survey, WIYN, Two Micron All Sky Survey, Wide-field Infrared Survey Explorer, and Spitzer. Morphological parameters such as Sérsic index, effective radius, position angle, and axis ratio for the bulge and the disk are thus derived at all of the wave bands, which enables quantifying the morphological K-correction for M81 and makes it possible to reproduce images for the bulge and the disk in the galaxy at any wave band. The morphology as a function of wavelength appears as a variable-slope trend of the Sérsic index and the effective radius, in which the variations are steep at UV–optical and shallow at optical–NIR bands; the position angle and the axis ratio keep invariable at least at optical–NIR bands. It is worth noting that the Sérsic index for the bulge reaches ∼4–5 at optical and NIR bands, but drops to ∼1 at UV bands. This difference brings forward a caveat that a classical bulge is likely misidentified for a pseudobulge or no bulge at high redshifts where galaxies are observed through rest-frame UV channels with optical telescopes. The next work of this series is planned to study spatially resolved spectral energy distributions for the bulge and the disk, respectively, and thereby explore stellar population properties and star formation/quenching history for the galaxy composed of the subsystems.
影响因子：
4.8
作者：
S. Tacchella;B. Diemer;L. Hernquist;S. Genel;F. Marinacci;D. Nelson;A. Pillepich;V. Rodriguez-Gomez-V.-Rodriguez
通讯作者：
S. Tacchella;B. Diemer;L. Hernquist;S. Genel;F. Marinacci;D. Nelson;A. Pillepich;V. Rodriguez-Gomez-V.-Rodriguez
EDGE-CALIFA 调查：旋臂和棒在驱动中心分子气体浓度中的作用
影响因子：
6.5
作者：
Yu, Si-Yue;Kalinova, Veselina;Colombo, Dario;Bolatto, Alberto D.;Wong, Tony;Levy, Rebecca C.;Villanueva, Vicente;Sánchez, Sebastián F.;Ho, Luis C.;Vogel, Stuart N.
通讯作者：
Vogel, Stuart N.