On the Velocity Dispersion Profiles of Elliptical Galaxies Using MaNGA IFU Data

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题名:	On the Velocity Dispersion Profiles of Elliptical Galaxies Using MaNGA IFU Data
作者:	謝旻莉;Poblete, Shemile
贡献者:	天文研究所
关键词:	Elliptical Galaxies;BCGs;Velocity Dispersion
日期:	2023-01-19
上传时间:	2024-09-19 14:43:43 (UTC+8)
出版者:	國立中央大學
摘要:	本研究中，橢圓星系的動力學剖線和星系特質被系統化地探索。最新的研究顯示，一種特殊的橢圓星系分類，稱為星團最亮星系，被發現展現幾乎平坦的速度離散度剖線，和一般下降曲線不同。所以，從有積分視場單元的攝譜儀資料的大量樣本中分類速度離散度剖線是重要的。在紅移小於0.15的MaNGA資料庫中的4800星系裡，大約有1400個橢圓星系被判定依據史隆數位巡天中第15次資料發布的光度以及型態資料。在我們的樣本中，引入一個經驗的速度離散度剖線並使用最大概似估計擬和，以及線性擬和。三種不同的速度離散度剖線被分類出。一些星系特質的關聯性和直方圖也同時被探究，包含辨識出的星團最亮星系。;In this study, kinematic profiles of elliptical galaxies are systematically explored, as well as the correlations between their galactic properties. More recently, a specific type of elliptical galaxy, Brightest Cluster Galaxies (BCGs), was found to demonstrate nearly flat velocity dispersion profiles, which is different from the usual declining profiles. So, categorizing the different types of velocity dispersion profiles is important to be investigated in a large sample with integrated field unit (IFU) spectrograph data. Among the 4800 galaxies in MaNGA with redshift range z < 0.15, around 1400 elliptical galaxies are determined based on Sloan Digital Sky Survey (SDSS) DR15 photometric and morphological data. An empirical velocity dispersion profile is introduced for all elliptical galaxies in our samples and found the best fit using maximum likelihood estimation as well as linear fit. 3 different types of velocity dispersion profiles are categorized. Some galactic properties are also studied with their correlations and histograms including identified BCGs.
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