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arXiv 2209.04081astro-ph.COastro-ph.GA
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VOICE深巡天中的星系-星系透镜现象

Galaxy-galaxy lensing in the VOICE deep survey

Ruibiao Luo, Liping Fu, Wentao Luo, Nicola R. Napolitano, Linghua Xie, Mario Radovich, Jing Liu, Rui Li, Valeria Amaro, Zhu Chen, Dezi Liu, Zuhui Fan, Giovanni … 展开作者

Ruibiao Luo, Liping Fu, Wentao Luo, Nicola R. Napolitano, Linghua Xie, Mario Radovich, Jing Liu, Rui Li, Valeria Amaro, Zhu Chen, Dezi Liu, Zuhui Fan, Giovanni Covone, Mattia Vaccari

摘要:

VOICE成像数据的多波段测光,与钱德拉深场南(CDFS)区域的4.9度$^2$重叠,使形状测量和测光红移估计成为弱透镜分析的两个基本量。在$r$ -波段,$mag_{AB}$的深度达到26.1(5 $σ$极限)。我们估计的额外表面密度(ESD; $ΔΣ$)的基础上星系周围的星系测量在较低的红移(0.10< $z_l$ <0.35),而我们选择的背景源是在较高的红移范围从0.3到1.5。前景星系根据其颜色(蓝色/红色)分为两大类,每一类又进一步分为高/低恒星质量仓。然后,通过对信号建模来估计样本的晕质量,并且通过蒙特卡罗马尔可夫链(MCMC)过程来估计参数的后验样本。我们将我们的结果与现有的恒星与晕质量关系(SHMR)进行比较,发现蓝色低恒星质量箱(中位数$M_*=10^{8.31}M_\odot$)偏离了SHMR关系,而所有其他三个样本都与经验曲线一致。我们将这种差异解释为低质量蓝矮星星系人口占主导地位的VOICE-CDFS区域的低恒星形成效率的影响。

英文摘要:

The multi-band photometry of the VOICE imaging data, overlapping with 4.9 deg$^2$ of the Chandra Deep Field South (CDFS) area, enables both shape measurement and photometric redshift estimation to be the two essential quantities for weak lensing analysis. The depth of $mag_{AB}$ is up to 26.1 (5$σ$ limiting) in $r$-band. We estimate the Excess Surface Density (ESD; $ΔΣ$) based on galaxy-galaxy measurements around galaxies at lower redshift (0.10<$z_l$<0.35) while we select the background sources to be at higher redshift ranging from 0.3 to 1.5. The foreground galaxies are divided into two major categories according to their colour (blue/red), each of which has been further divided into high/low stellar mass bins. Then the halo masses of the samples are estimated by modelling the signals, and the posterior of the parameters are samples via Mote Carlo Markov Chain (MCMC) process. We compare our results with the existing Stellar-to-Halo Mass Relation (SHMR) and find that the blue low stellar mass bin (median $M_*=10^{8.31}M_\odot$) deviates from the SHMR relation whereas all other three samples agrees well with empirical curves. We interpret this discrepancy as the effect of a low star formation efficiency of the low-mass blue dwarf galaxy population dominated in the VOICE-CDFS area.

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