Shadows in the Dark: Low-surface-brightness Galaxies Discovered in the Dark Energy Survey
Shadows in the Dark: Low-surface-brightness Galaxies Discovered in the Dark Energy Survey
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DOI：
10.3847/1538-4365/abca89
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发表时间：
2020-06
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通讯作者：
D. Tanoglidis;A. Drlica-Wagner;K. Wei;Tian Li;Fjm Sanchez;Y.-H. Zhang;A. Peter;A. Feldmeier-Krause;J. Prat;K. Casey;A. Palmese;C. Sánchez;J. DeRose;C. Conselice;T. Abbott;M. Aguena;S. Allam;S. Ávila;K. Bechtol;E. Bertin;S. Bhargava;D. Brooks;D. Burke;A. Rosell;M. Kind;J. Carretero;C. Chang;M. Costanzi;L. Costa;J. Vicente;S. Desai;H. Diehl;P. Doel;T. Eifler;S. Everett;A. Evrard;B. Flaugher;J. Frieman;J. García-Bellido;D. Gerdes;R. Gruendl;J. Gschwend;G. Gutiérrez;W. Hartley;D. Hollowood;D. Huterer;D. James;E. Krause;K. Kuehn;N. Kuropatkin;M. Maia;M. March;J. Marshall;F. Menanteau;R. Miquel;R. Ogando;F. Paz-Chinchón;A. Romer;A. Roodman;E. Sánchez;V. Scarpine;S. Serrano;I. Sevilla-Noarbe;M. Smith;E. Suchyta;G. Tarlé;D. Thomas;D. Tucker;A. Walker
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作者：
D. Tanoglidis;A. Drlica-Wagner;K. Wei;Tian Li;Fjm Sanchez;Y.-H. Zhang;A. Peter;A. Feldmeier-Krause;J. Prat;K. Casey;A. Palmese;C. Sánchez;J. DeRose;C. Conselice;T. Abbott;M. Aguena;S. Allam;S. Ávila;K. Bechtol;E. Bertin;S. Bhargava;D. Brooks;D. Burke;A. Rosell;M. Kind;J. Carretero;C. Chang;M. Costanzi;L. Costa;J. Vicente;S. Desai;H. Diehl;P. Doel;T. Eifler;S. Everett;A. Evrard;B. Flaugher;J. Frieman;J. García-Bellido;D. Gerdes;R. Gruendl;J. Gschwend;G. Gutiérrez;W. Hartley;D. Hollowood;D. Huterer;D. James;E. Krause;K. Kuehn;N. Kuropatkin;M. Maia;M. March;J. Marshall;F. Menanteau;R. Miquel;R. Ogando;F. Paz-Chinchón;A. Romer;A. Roodman;E. Sánchez;V. Scarpine;S. Serrano;I. Sevilla-Noarbe;M. Smith;E. Suchyta;G. Tarlé;D. Thomas;D. Tucker;A. Walker
我们列出了23,790个扩展的低表面亮度星系(LSBG)的目录，这些星系是从暗能量调查(DES)最初三年的成像数据中确定的。在单分量S模型的基础上，我们将扩展的LSBG定义为具有g带有效半径和平均表面亮度的星系。我们发现在(g−r)和(g−i)颜色空间中LSBG的分布是强双峰的。我们将样本分为红色(g−I≥0.60)和蓝色(g−I<；0.60)星系，并研究这两个星系的性质。红色的LSBG比蓝色的LSBG更聚集，并与附近(z<；0.10)明亮星系的分布相关。红色LSBG占我们LSBG样本的∼的33%，其中位于低红移星系群和星系团的1°范围内(相比之下，蓝色LSBG的∼为8%)。对于九个最突出的星系团和星系团，我们假设来自主机系统的红移，计算了相关LSBG的物理性质。在这些系统中，我们识别了41个可被归类为超扩散星系的天体，定义为具有投影物理有效半径和中心表面亮度的LSBG。DES中LSBG的广域样品可以用来检验环境对LSBG形成和演化模型的作用。
We present a catalog of 23,790 extended low-surface-brightness galaxies (LSBGs) identified in from the first three years of imaging data from the Dark Energy Survey (DES). Based on a single-component Sérsic model fit, we define extended LSBGs as galaxies with g-band effective radii and mean surface brightness . We find that the distribution of LSBGs is strongly bimodal in (g − r) versus (g − i) color space. We divide our sample into red (g − i ≥ 0.60) and blue (g − i < 0.60) galaxies and study the properties of the two populations. Redder LSBGs are more clustered than their blue counterparts and are correlated with the distribution of nearby (z < 0.10) bright galaxies. Red LSBGs constitute ∼33% of our LSBG sample, and of these are located within 1° of low-redshift galaxy groups and clusters (compared to ∼8% of the blue LSBGs). For nine of the most prominent galaxy groups and clusters, we calculate the physical properties of associated LSBGs assuming a redshift derived from the host system. In these systems, we identify 41 objects that can be classified as ultradiffuse galaxies, defined as LSBGs with projected physical effective radii and central surface brightness . The wide-area sample of LSBGs in DES can be used to test the role of environment on models of LSBG formation and evolution.