Low Surface Brightness Galaxies Selected by Different Model Fitting

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外文摘要：We present a study of low surface brightness galaxies(LSBGs)selected by fitting the images for all the galaxies in α.40 SDSS DR7 sample with two kinds of single-component models and two kinds of two-component models(disk+bulge):single exponential,single sérsic,exponential+deVaucular(exp+deV),and exponential+sérsic(exp+ser).Under the criteria of the B band disk central surface brightness μ0,disk(B)≥ 22.5 mag arcsec-2 and the axis ratio b/a＞0.3,we selected four none-edge-on LSBG samples from each of the models which contain 1105,1038,207,and 75 galaxies,respectively.There are 756 galaxies in common between LSBGs selected by exponential and sérsic models,corresponding to 68.42％of LSBGs selected by the exponential model and 72.83％of LSBGs selected by the sérsic model,the rest of the discrepancy is due to the difference in obtaining μ0 between the exponential and sérsic models.Based on the fitting,in the range of 0.5 ≤ n≤1.5,the relation of μ0 from two models can be written as μ0,sérsic-μ0,exp=-1.34(n-1).The LSBGs selected by disk+bulge models(LSBG_2comps)are more massive than LSBGs selected by single-component models(LSBG_lcomp),and also show a larger disk component.Though the bulges in the majority of our LSBG_2comps are not prominent,more than 60％of our LSBG_2comps will not be selected if we adopt a single-component model only.We also identified 31 giant low surface brightness galaxies(gLSBGs)from LSBG_2comps.They are located at the same region in the color-magnitude diagram as other gLSBGs.After we compared different criteria of gLSBGs selection,we find that for gas-rich LSBGs,M*＞1010M⊙ is the best to distinguish between gLSBGs and normal LSBGs with bulge.

外文关键词：

catalogsgalaxies:spiralgalaxies:bulgesmethods:data analysismethods:statistical

作者：

Bing-Qing Zhang、Hong Wu、Wei Du、Pin-Song Zhao、Min He、Feng-Jie Lei

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作者单位：

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

基金：

国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金中国科学院青年创新促进会项目science research grants of CSST from the China Manned Space Project国家自然科学基金国家自然科学基金中国科学院战略规划重点项目Open Project Program of the Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Scien

项目编号：

2022YFA1602901120900401209004112003043202005711733006U1931109XDB0550100

出版年：

2024

DOI：

10.1088/1674-4527/ad0b86

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(1)

参考文献量60