We present a long temporal baseline variability survey in the Frontier Field MACSJ1149. In this study, we identify active galactic nuclei (AGNs) and other transient sources via their variability using over a decade of Hubble Space Telescope (HST) images for thousands of galaxies in the cluster region and detect significant variability in galaxies extending down to an apparent nuclear magnitude of m$_{i}$ $<$ 26.5. Our analysis utilizes HST images obtained in six different wavelengths from 435 nm to 1.6 microns and covers time scales 12 hours to 12 years apart. We find that $\sim$2% of galaxies in these images are variable with 49 AGN candidates and 4 new supernovae candidates detected. Half of the variables are in the cluster and these are primarily elliptical galaxies displaying variability only in the near-infrared bands. About 20% of the AGN candidates have morphologies and colors consistent with quasars, though most of the variables appear to be dominated by the host galaxy light. The structure function for these sources show a greater amplitude of variability at shorter wavelengths with slopes shallower than typical quasars. We also report a previously unknown Einstein cross identified in this field.
A Parsec-Scale Transient High-Frequency-Peaked Radio Source in the Very Large Array Sky Survey Brightening and Fading over a Decadal Timescale
David A. Dunlap Department of Astronomy & Astrophysics, University of Toronto（多伦多大学戴维·A·邓普天文学与天体物理学系）；Dunlap Institute for Astronomy & Astrophysics, University of Toronto（多伦多大学邓普天文学与天体物理学研究所）；Department of Astronomy and Astrophysics, University of California, Santa Cruz（加州大学圣克鲁兹分校天文学与天体物理学系）；National Radio Astronomy Observatory（美国国家射电天文台）
Dwarf Active Galactic Nuclei from Variability for the Origins of Seeds (DAVOS): Properties of Variability-Selected AGNs in the Dark Energy Survey Deep Fields
Variability survey in the young open cluster IC 1805
年轻疏散星团IC 1805的变星巡天是正在弗罗茨瓦夫进行的北天疏散星团中寻找早期型变星计划的一部分（参见Jerzykiewicz et al. 2011及其参考文献）。我们特别感兴趣的脉动恒星，如仙王座β和SPB。这些恒星是非常有希望的星震学目标。特别是，富含这些变量的疏散星团可用于所谓的集合星震学（Saesen et al. 2010）。
The JCMT Transient Survey: Identifying Submillimetre Continuum Variability over Several Year Timescales Using Archival JCMT Gould Belt Survey Observations
The VISTA Variables in the Via Lactea survey: A first glance on stellar variability
Via Lactea（VVV）中的VISTA变量是ESO对银河系隆起和南部中面邻近区域的公开近红外变化调查。它将在ZYJHKs滤波器中产生一个深度图集，以及一个约10^9个点源的KS波段时间序列数据库，其中预计>约10^6个点源是可变的。VVV的直接科学目标之一是提供主要距离指标的精确光变曲线，如RR Lyrics恒星，并利用这些数据制作调查区域的3D地图，并最终追踪银河系内部的结构。本文以5年巡天的前1.5年为基础，对VVV测光时间序列的基本性质和总体质量进行了初步评价，并利用这些数据估算了变星源所占的比例。
An X-ray Extremely wide-field Spectroscopic Surveyor (XESS, or "chess")
NASA MSFC（美国国家航空航天局马歇尔太空飞行中心）；Northwestern University（西北大学）；LLNL（劳伦斯利弗莫尔国家实验室）；INAF Rome（意大利国家天体物理研究所罗马分部）；Harvard University（哈佛大学）；NASA MSFC/USRA（美国国家航空航天局马歇尔太空飞行中心/联合研究协会）；Smithsonian Astrophysical Observatory（史密森尼天体物理台）；University of Alabama, Huntsville（阿拉巴马大学亨茨维尔分校）；NASA MSFC/University of Alabama, Huntsville（美国国家航空航天局马歇尔太空飞行中心/阿拉巴马大学亨茨维尔分校）；University of Alaska（阿拉斯加大学）；University of Toledo（托莱多大学）；NRAO（美国国家射电天文台）；University of Alabama, Tuscaloosa（阿拉巴马大学塔斯卡卢萨分校）；NASA MSFC/ORAU（美国国家航空航天局马歇尔太空飞行中心/奥尔巴尼研究联盟）
