BOSS和DECaLS的LRG的质量-尺寸关系
The mass-size relation of LRGs from BOSS and DECaLS
摘要：
我们使用与SDSS-III/BOSS DR 12光谱表匹配的DECaLS DR 3巡天光度计，研究了红移范围$0.2<z<0.7$的CMASS和LOWZ星系样本中亮红星系（LRGs）的形态和恒星质量大小关系。这两个样本的绝大多数是由早期类型的星系与德Vaucouleurs配置文件，而只有不到20%的晚型指数。我们使用更高分辨率的CFHT/MegaCam观测校准DECaLS有效半径，并优化每种形态类型的校正。通过交叉匹配的光度特性的早型人口与朴茨茅斯恒星质量目录，我们能够探索高质量的分布端使用一个大样本的313,026个星系超过4380度$^{2}$。我们发现这些星系的大小和恒星质量之间存在明显的相关性，在较低的质量下，这些星系的大小和恒星质量似乎比以前的估计更平坦。这些早型星系的大小在BOSS红移范围内没有表现出明显的演化，但当这些结果与高质量端的$z\sim0.1$ SDSS测量相结合时，发现红移略有下降的趋势。BOSS和DECaLS之间的协同作用在其他领域也有重要的应用，包括星系聚类和弱透镜。
英文摘要：
We use the DECaLS DR3 survey photometry matched to the SDSS-III/BOSS DR12 spectroscopic catalog to investigate the morphology and stellar mass-size relation of luminous red galaxies (LRGs) within the CMASS and LOWZ galaxy samples in the redshift range $0.2<z<0.7$. The large majority of both samples is composed of early-type galaxies with De Vaucouleurs profiles, while only less than 20% are late-type exponentials. We calibrate DECaLS effective radii using the higher resolution CFHT/MegaCam observations and optimise the correction for each morphological type. By cross-matching the photometric properties of the early-type population with the Portsmouth stellar mass catalog, we are able to explore the high-mass end of the distribution using a large sample of 313,026 galaxies over 4380 deg$^{2}$. We find a clear correlation between the sizes and the stellar masses of these galaxies, which appears flatter than previous estimates at lower masses. The sizes of these early-type galaxies do not exhibit significant evolution within the BOSS redshift range, but a slightly declining redshift trend is found when these results are combined with $z\sim0.1$ SDSS measurements at the high-mass end. The synergy between BOSS and DECaLS has important applications in other fields, including galaxy clustering and weak lensing.
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