Expectations for time-delay measurements in active galactic nuclei with the Vera Rubin Observatory
Bozena Czerny, Swayamtrupta Panda, Raj Prince, Vikram Kumar Jaiswal, Michal Zajacek, Mary Loli Martinez Aldama, Szymon Kozlowski, Andjelka B. Kovacevic, Dragana… 展开作者
Bozena Czerny, Swayamtrupta Panda, Raj Prince, Vikram Kumar Jaiswal, Michal Zajacek, Mary Loli Martinez Aldama, Szymon Kozlowski, Andjelka B. Kovacevic, Dragana Ilic, Luka C. Popovic, Francisco Pozo Nunez, Sebastian F. Hoenig, William N. Brandt
Vera Rubin天文台将提供前所未有的时域天空观测数据集。计划开展的为期10年的空间与时间遗产巡天(Legacy Survey of Space and Time, LSST)将为深场钻探区(Deep Drilling Fields, DDFs)内的数千个活动星系核(active galactic nuclei, AGN)提供密集光变曲线,同时为数百万个AGN提供采样密度较低的光变曲线。本研究针对利用这些数据测量发射线相对于连续谱的时延的前景开展了模拟分析。\n研究采用Timmer-Koenig算法生成人工光变曲线,使用代表性观测采样率对其进行采样,并在光变曲线中加入预期的强发射线(Hβ、Mg II、C IV)、Fe II伪连续谱以及星光的污染贡献。研究根据红移选择合适的测光波段,针对100组光变曲线的统计实现,对比了假设的发射线时延与反演得到的时延。\n结果显示,对于类星体分布的亮端样本(约占所有源的15%),主巡天数据可在1σ误差范围内较好地测量发射线时延;对于DDFs中的更暗类星体,使用全部10年数据时的测量结果同样可靠。此外,利用前两年数据、甚至首个观测季的数据,也有望测量红移最小的最暗类星体的时延。对整个类星体种群的测量看似能获得高精度结果,但模拟中发现假设时延与反演时延之间存在依赖于红移和源光度的系统偏差,即便统计样本量很大,该偏差也不会消失。若不开展针对这类效应的校正模拟,该问题可能会影响半径-光度关系的斜率测量以及类星体的宇宙学应用。
英文摘要:
The Vera Rubin Observatory will provide an unprecedented set of time-dependent observations of the sky. The planned Legacy Survey of Space and Time (LSST) operating for 10 years will provide dense lightcurves for thousands of active galactic nuclei (AGN) in Deep Drilling Fields (DDFs) and less dense lightcurves for millions of AGN. We model the prospects for measuring time delays for emission lines with respect to the continuum, using these data. We model the artificial lightcurves using Timmer-Koenig algorithm, we use the exemplary cadence to sample them, we supplement lightcurves with the expected contamination by the strong emission lines (Hbeta, Mg II and CIV as well as with Fe II pseudo-continuum and the starlight). We choose the suitable photometric bands appropriate for the redshift and compare the assumed line time delay with the recovered time delay for 100 statistical realizations of the light curves. We show that time delays for emission lines can be well measured from the Main Survey for the bright tail of the quasar distribution (about 15% of all sources) with the accuracy within 1 sigma error, for DDFs results for fainter quasars are also reliable when all 10 years of data are used. There are also some prospects to measure the time delays for the faintest quasars at the smallest redshifts from the first two years of data, and eventually even from the first season. The entire quasar population will allow obtaining results of apparently high accuracy but in our simulations, we see a systematic offset between the assumed and recovered time delay depending on the redshift and source luminosity which will not disappear even in the case of large statistics. Such a problem might affect the slope of the radius-luminosity relation and cosmological applications of quasars if simulations correcting for such effects are not performed.
Discovery of the Distant, Ultra-Faint Milky Way Satellite Aquarius IV with the Vera C. Rubin Observatory Early Data Preview 2
Yale University(耶鲁大学);University of Chicago(芝加哥大学);Fermi National Accelerator Laboratory(费米国家加速器实验室);University of Virginia(弗吉尼亚大学);University of Washington(华盛顿大学)
Spectral Energy Distributions in Three Deep-Drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties
W-CDF-S、ELAIS-S1和XMM-LSS将是Vera C. Rubin Observatory Legacy Survey of Space and Time(LSST),但其广泛的多波长数据尚未像另一个LSST DDF COSMOS领域那样得到充分利用。为了为未来的科学做准备,我们在这三个领域中拟合了从X射线到远红外的源光谱能量分布(SED),主要用于推导星系恒星质量和恒星形成率。我们使用CIGALE v2022.0,这是一个定期开发和评估的代码,用于SED拟合。我们的目录包括覆盖W-CDF-S中的$4.9~\mathrm{deg^2}$的80万个源、覆盖ELAIS-S1中的$3.4~\mathrm{deg^2}$的80万个源和覆盖XMM-LSS中的$4.9~\mathrm{deg^2}$的120万个源。除了拟合正常星系外,我们还选择可能拥有活动星系核(AGN)或正在经历最近恒星形成变化的候选者,并使用专门为这些来源设计的模型来拟合它们的SED;这增加了我们的目录在未来各种项目中的实用性。我们校准我们的测量结果与那些在研究较小的区域进行比较,并简要讨论了我们的研究结果的影响。我们还进行了详细的测试的完整性和纯度的SED选择活动星系核。我们的数据可以从公共网站检索。
Pushing Variability Searches to Extreme Dwarf Galaxies with the Vera C. Rubin Observatory Data Preview 2
University of Michigan(密歇根大学);The Pennsylvania State University(宾夕法尼亚州立大学);Universidad de Tarapacá(塔拉帕卡大学);INAF-Osservatorio Astronomico di Roma(罗马天文台(意大利国家天体物理研究所));University of North Texas(北德克萨斯大学);Swinburne University of Technology(斯威本科技大学);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台)
Skykatana: a scalable framework to construct sky masks for the Vera Rubin Observatory and large astronomical surveys
Instituto de Ciencias Astronómicas, de la Tierra y del Espacio (ICATE), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)(地球与空间天文科学研究所 (ICATE),阿根廷国家科学研究委员会 (CONICET));Facultad de Ciencias Exactas, Físicas y Naturales (FCEFYN-UNSJ), Universidad Nacional de San Juan(圣胡安国立大学精确、物理与自然科学学院 (FCEFYN-UNSJ));Instituto de Astronomía Teórica y Experimental (IATE), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)(理论与实验天文学研究所 (IATE),阿根廷国家科学研究委员会 (CONICET));Observatorio Astronómico Córdoba , Universidad Nacional de Córdoba(科尔多瓦天文台,科尔多瓦国立大学)
Direct geometrical measurement of the Hubble constant from galaxy parallax: predictions for the Vera C. Rubin Observatory and Nancy Grace Roman Space Telescope
Rubin Observatory Reveals a Dust-Shrouded Halo Globular Cluster in Ophiuchus
University of Chicago(芝加哥大学);Yale University(耶鲁大学);University of Virginia(弗吉尼亚大学);Fermi National Accelerator Laboratory(费米国家加速器实验室);University of Washington(华盛顿大学)
Photometric redshifts for active galactic nuclei with LePHARE for the Vera C. Rubin Observatory
Max-Planck-Institut für extraterrestrische Physik(马克斯·普朗克地外物理学研究所);Exzellenzcluster ORIGINS(ORIGINS卓越集群);Université Clermont-Auvergne(克莱蒙奥弗涅大学);Aix-Marseille Université(艾克斯-马赛大学);Université Paris-Saclay(巴黎萨克雷大学);Université Paris-Cité(巴黎 Cité 大学);Núcleo de Astronomía de la Facultad de Ingeniería, Universidad Diego Portales(迭戈帕拉莱斯大学工程学院天文学中心);School of Physics and Astronomy, University of Southampton(南安普顿大学物理与天文学院);INAF-Osservatorio Astronomico di Roma(罗马国家天体物理研究所天文台);Institute for Gravitation and the Cosmos, The Pennsylvania State University(宾夕法尼亚州立大学引力与宇宙学研究所)
本研究针对Vera C. Rubin天文台的LSST巡天,用LePHARE分析AGN测光红移的影响因素,提供AGN处理配置及COSMOS天区AGN测光红移数据,优化AGN测光红移计算。
AGN Variability with Rubin Observatory in the 2030s
International Gemini Observatory/NSF NOIRLab(国际双子星天文台/美国国家光学红外天文实验室);Heidelberg Institute for Theoretical Studies(海德堡理论研究所);Departamento de Astronomia, Instituto de Física, Universidade Federal do Rio Grande do Sul(南里奥格兰德联邦大学物理学院天文学系);Kavli Institute for Astronomy and Astrophysics, Peking University(北京大学卡尔·格利夫天体物理学研究所);Center for Theoretical Physics, Polish Academy of Sciences(波兰科学院理论物理中心);Instituto de Astrofísica de Andalucía (IAA-CSIC)(安达卢西亚天体物理学研究所(西班牙高等科学研究委员会));Istituto Nazionale di Astrofisica, Osservatorio di Padova(意大利国家天体物理研究所帕多瓦观测站)
A Deep Look at the Ultra-Faint Milky Way Satellite Virgo III with Rubin Observatory Data Preview 2
University of Chicago(芝加哥大学);Kavli Institute for Cosmological Physics, University of Chicago(芝加哥大学卡弗里宇宙物理学研究所);NSF-Simons AI Institute for the Sky (SkAI)(美国国家科学基金会-西蒙斯天空人工智能研究所);Fermi National Accelerator Laboratory(费米国家加速器实验室);Department of Astronomy and Astrophysics, University of Chicago(芝加哥大学天体物理学系);DIRAC Institute, Department of Astronomy, University of Washington(华盛顿大学天文学系迪拉克研究所);Department of Astronomy, Yale University(耶鲁大学天文学系)
NSF-DOE Vera C. Rubin Observatory Observations of Interstellar Comet 3I/ATLAS (C/2025 N1)
LSST Interdisciplinary Network for Collaboration and Computing Frameworks(LSST跨学科合作与计算框架网络);Dept. of Astronomy & the DiRAC Institute, University of Washington(华盛顿大学天文学系及DiRAC研究所);Department of Astronomy and Planetary Science, Northern Arizona University(北亚利桑那大学天文与行星科学系)
本文报告了NSF-DOE Vera C. Rubin Observatory对星际彗星3I/ATLAS的观测结果,包括其天体测量、光度学、形态学和活动性测量,展示了该望远镜在早期观测中的精度和发现潜力。
Rubin LSST observing strategies to maximize volume and uniformity coverage of Star Forming Regions in the Galactic Plane
在全天巡天时代,绘制银河系最年轻的恒星星族的完整地图是现代天体物理学中最具挑战性的目标之一。最年轻的恒星组成部分的特性是至关重要的,不仅对银河系结构的全球概览,银河系薄盘,其旋臂,但也为当地的研究。事实上,恒星形成区(SFR)的识别以及与它们形成的环境的比较,对于将它们置于周围巨大分子云的背景下以及理解与恒星和行星形成过程相关的未知物理机制也是至关重要的。在10年的观察中,Vera C. Rubin Legacy Survey of Space and Time(Rubin-LSST)将实现精致的光度深度,这将使我们能够显着扩展我们能够发现新SFR的体积,并扩大我们自己的银河系的详细知识领域。本文描述了一个度量,它估计了< 10 Myr and masses >Rubin LSST观测在5 σ星等显著性的GRI带中将探测到的年龄为t 0.3 M $_\odot$的年轻恒星的总数。我们采用最新的模拟Rubin-LSST调查策略来检查我们的指标结果,以评估不同的观察策略可能对我们的科学案例产生的影响。
A First Measurement of Circumgalactic Dust Reddening from Only 4.6 deg$^2$ of the Rubin Observatory's Data Preview 1
Kavli Institute of Particle Astrophysics and Cosmology, USA(美国卡弗里粒子天体物理与宇宙学研究所);Department of Physics, Stanford University, Stanford, CA 94305-4085, USA(斯坦福大学物理系);SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA(SLAC国家加速器实验室);Department of Astronomy, University of Washington, Seattle, WA 98195, USA(华盛顿大学天文学系)
DAVOS: Dwarf Active Galactic Nuclei from Variability for the Origins of Seeds: Properties of Variability-Selected Active Galactic Nuclei in the COSMOS Field and Expectations for the Rubin Observatory
Scalable and Robust Multiband Modeling of AGN Light Curves in Rubin-LSST
Bishop’s University(主教大学);Yale University(耶鲁大学);Universidad Diego Portales(迭戈·波特莱斯大学);Wayne State University(韦恩州立大学);Universidad de Tarapacá(塔拉帕卡大学);University of Napoli “Federico II(那不勒斯费德里科二世大学);INAF - Osservatorio Astronomico di Capodimonte(意大利国家天体物理研究所卡波迪蒙特天文台);Millennium Institute of Astrophysics (MAS)(天体物理学千年研究所)
Hyrax: An Extensible Framework for Rapid ML Experimentation and Unsupervised Discovery in the Era of Rubin, Roman, and Euclid
Dept. of Astronomy \& the DiRAC Institute, University of Washington, Box 351580, Seattle, WA 98195, USA;School of Physics;Astronomy, University of Minnesota, Minneapolis, MN 55455, USA;Department of Astronomy;Planetary Science, Northern Arizona University, Flagstaff, USA;McWilliams Center for Cosmology;Astrophysics, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA