Low Surface Brightness Galaxies from BASS+MzLS with Machine Learning  

作　　者：Peng-Liang Du Wei Du Bing-Qing Zhang Zhen-Ping Yi Min He Hong Wu 

机构地区：[1]Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Mechanical,Electrical and Information Engineering,Shandong University,Weihai 264209,China

出　　处：《Research in Astronomy and Astrophysics》2024年第5期185-197,共13页天文和天体物理学研究（英文版）

基　　金：supported by the National Key R&D Program of China(grant No.2022YFA1602901);the Youth Innovation Promotion Association,Chinese Academy of Sciences(No.2020057);the science research grants from the China Manned Space Project,and the National Natural Science Foundation of China(NSFC,grant Nos.12090041 and 12090040);Additional support comes from the Strategic Priority Research Program of the Chinese Academy of Sciences(grant Nos.XDB0550100 and XDB0550102);the Open Project Program of the Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences。

摘　　要：From ∼5000 deg^(2) of the combination of the Beijing–Arizona Sky Survey and Mayall z-band Legacy Survey which is also the northern sky region of the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys, we selected a sample of 31,825 candidates of low surface brightness galaxies (LSBGs) with the mean effective surface brightness 24.2<μ_(eff.g)<28.8 mag arcsec^(−2) and the half-light radius 2.″5 < r_(eff)<20″ based on the released photometric catalog and the machine learning model. The distribution of the LSBGs is bimodal in the g−r color, indicating the two distinct populations of the blue (g−r< 0.60) and red (g−r> 0.60) LSBGs. The blue LSBGs appear spiral, disk or irregular while the red LSBGs are spheroidal or elliptical and spatially clustered. This trend shows that the color has a strong correlation with galaxy morphology for LSBGs. In the spatial distribution, the blue LSBGs are more uniformly distributed while the red ones are highly clustered, indicating that red LSBGs preferentially populate a denser environment than the blue LSBGs. Besides, both populations have a consistent distribution of ellipticity (median ∈∼ 0.3), half-light radius (median r_(eff) ∼ 4″) and Sérsic index (median n=1), implying the dominance of the full sample by the round and disk galaxies. This sample has definitely extended the studies of LSBGs to a regime of lower surface brightness, fainter magnitude and broader other properties than the previously Sloan Digital Sky Survey-based samples.

关 键 词：catalogs-galaxies fundamental parameters-galaxies statistics-techniques PHOTOMETRIC 

分 类 号：TP181[自动化与计算机技术—控制理论与控制工程] P15[自动化与计算机技术—控制科学与工程]