首页|Low Surface Brightness Galaxies from BASS+MzLS with Machine Learning

Low Surface Brightness Galaxies from BASS+MzLS with Machine Learning

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From～5000 deg2 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＜reff＜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 ϵ～0.3),half-light radius(median reff～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.

catalogsgalaxies:fundamental parametersgalaxies:statisticstechniques:photometric

Peng-Liang Du、Wei Du、Bing-Qing Zhang、Zhen-Ping Yi、Min He、Hong Wu

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Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China

School of Mechanical,Electrical and Information Engineering,Shandong University,Weihai 264209,China

National Key R&D Program of ChinaYouth Innovation Promotion Association,Chinese Academy of Sciencesscience research grants from the China Manned Space ProjectNational Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Strategic Priority Research Program of the Chinese Academy of SciencesStrategic Priority Research Program of the Chinese Academy of SciencesOpen Project Program of the Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Scien

2022YFA160290120200571209004112090040XDB0550100XDB0550102

2024

10.1088/1674-4527/ad3954

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(5)
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