Galaxy Merger Fractions in Two Clusters at Using the Hubble Space Telescope
Galaxy Merger Fractions in Two Clusters at Using the Hubble Space Telescope
复制标题
DOI：
10.3847/1538-4357/ab06ef
复制
发表时间：
2019-02
期刊：
影响因子：
--
通讯作者：
C. Watson;K. Tran;Adam P Tomczak;Leo Y. Alcorn;Irene V. Salazar;Anshu Gupta;I. Momcheva;C. Papovich;P. V. Dokkum;G. Brammer;J. Lotz;C. Willmer
中科院分区：
文献类型：
--
作者：
C. Watson;K. Tran;Adam P Tomczak;Leo Y. Alcorn;Irene V. Salazar;Anshu Gupta;I. Momcheva;C. Papovich;P. V. Dokkum;G. Brammer;J. Lotz;C. Willmer
我们使用哈勃太空望远镜的成像和棱镜观测来测量两个星系团在z = 2的星系-星系合并的比例。这两个星系团候选者最初是使用斯皮策太空望远镜的深中红外成像和观测确定的，随后使用HST/WFC 3成像和棱镜观测进行了跟踪。我们使用WFC 3在F105 W，F125 W和F160 W波段的高分辨率成像来识别星系-星系合并候选者。通过对z 1.6星系团（IRC 0222 A）的G102和z 2星系团（IRC 0222 B）的G141进行棱镜观测，获得了相同物体的粗红移。使用视觉分类以及各种选择技术，我们测量合并分数在IRC 0222 A和IRC 0222 B。相比之下，我们测量的合并分数为场星系在z 2。我们的研究表明，星系-星系合并分数在z = 2的集群是增强相比，现场人口，但注意，在这个时代需要更多的集群测量，以确认我们的发现。
We measure the fraction of galaxy–galaxy mergers in two clusters at z ∼ 2 using imaging and grism observations from the Hubble Space Telescope. The two galaxy cluster candidates were originally identified as overdensities of objects using deep mid-infrared imaging and observations from the Spitzer Space Telescope, and were subsequently followed up with HST/WFC3 imaging and grism observations. We identify galaxy–galaxy merger candidates using high-resolution imaging with the WFC3 in the F105W, F125W, and F160W bands. Coarse redshifts for the same objects are obtained with grism observations in G102 for the z ∼ 1.6 cluster (IRC0222A) and G141 for the z ∼ 2 cluster (IRC0222B). Using visual classifications as well as a variety of selection techniques, we measure merger fractions of in IRC0222A and in IRC0222B. In comparison, we measure a merger fraction of for field galaxies at z ∼ 2. Our study indicates that the galaxy–galaxy merger fraction in clusters at z ∼ 2 is enhanced compared to the field population, but note that more cluster measurements at this epoch are needed to confirm our findings.