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所在平台: Coursera |
课程主页: https://www.coursera.org/learn/analyze
课程评论：没有评论
课程名称：分析宇宙 概述：本课程利用来自NASA的公开数据，分析实际卫星观测的天文X射线源，探索宇宙的一些神秘现象，包括中子星、黑洞、类星体和超新星。通过分析能量光谱和时间序列数据，理解这些令人难以置信的天体的工作原理。我们使用一种名为DS9的成像工具，探索天文观测的丰富多样性，使X射线天文学成为过去50年中最活跃和令人兴奋的科学研究领域之一。 每周我们会探讨X射线天文学的不同方面。课程从图像形成的基本概念开始，接着展示如何利用我们的成像程序DS9，加深对真实卫星数据的理解。您将使用科学家进行研究时所用的实际数据，感受天文学家在发现周期性双星X射线源、超新星及其残骸，以及影响我们宇宙学理解的外星源时所经历的激动和喜悦。 大纲： 1. 光与图像的本质......以及DS9介绍 - 本周探索光的性质，以及我们如何从获取的图像中获取天文信息。 2. 基本天文数据与DS9功能 - 本周探讨我们可以利用的一些手段，以便从星星中提取大量信息。 3. 恒星演化与白矮星 - 本周深入研究一个X射线源，涉及双星系统中的白矮星，准备好使用DS9进行分析。 4. 轨道、引力与天空中的时钟 - 本周关注于在X射线天文学初期发现的另一个迷人宇宙源Cen X-3。 5. 超新星，我们的宇宙回收中心 - 本周考察超新星及其残骸，探讨它们是未来恒星的孕育地，以及它们对我们太阳系构成的贡献。 6. 游历宇宙尽头；类星体3C273及其之外 - 本周总结，以游历远古的星系和异域对象，探索类星体的奥秘以及其对宇宙演化的线索。 通过本课程，您将获得广泛的宇宙知识，并体验到X射线天文学的探索乐趣和科学发现的兴奋。
Name:Light and the Nature of Images....Plus, an Introduction to DS9
Description:Welcome to Week 1 of "Analyzing the Universe!" This week we explore the nature of light, and how we get astronomical information from the images we obtain. The lectures and "wiki" material address these themes: light, image formation, and DS9. Dive right in!
Name: Basic Astronomical Data and a DS9 Smorgasbord
Description:Welcome to week two of "Analyzing the Universe". This week we will be exploring some of the means we have at our disposal to find out many things about the stars. It is really quite incredible that these tiny pinpoints of light can yield so much information about their nature and about the structure of the Universe as a whole. And if this is your first visit to the course, welcome and jump right in!
Name:Stellar Evolution and White Dwarfs
Description:This week is our first in-depth look at an x-ray source, and it involves a white dwarf in a binary system. So sharpen up your detective skills, keep your copy of DS9 at the ready, and let's get down to business. It should be an exciting week.
Name:Orbits, Gravity, and Clocks in the Sky
Description:This week we turn our attention to another fascinating cosmic source, discovered in the infancy of x-ray astronomy: Cen X-3. In so doing, we will see how binary stars can determine and influence many of the interesting and surprising features of our observations.
Name:Supernovae, Our Cosmic Recycling Centers
Description:This week, we will be examining supernovae, and their remnants. These fascinating objects are the breeding grounds for future stars, and were the sources of virtually all the atoms that make up our solar neighborhood. Every atom of calcium in every bone in your body, for example, was once shot out of a supernova, billions of years ago.
Name:To the Ends of the Universe; Quasars, 3C273, and beyond
Description: This week we wrap things up with trips to galaxies and exotic objects, seen long ago and far away. The mysterious quasars provide clues about the way our Universe is evolving in time. They are incredible objects (actually, come to think of it, what isn't incredible in the x-ray sky?) discovered almost exactly a half century ago, quite by accident. We will explore the astonishingly prodigious x-ray output of 3C 273, one of the nearest ones, at a mere 2.5 billion light years away.
Using publicly available data from NASA of actual satellite observations of astronomical x-ray sources, we explore some of the mysteries of the cosmos, including neutron stars, black holes, quasars and supernovae. We will analyze energy spectra and time series data to understand how these incredible objects work. We utilize an imaging tool called DS9 to explore the amazing diversity of astronomical observations that have made x-ray astronomy one of the most active and exciting fields of scientific investigation in the past 50 years. Each week we will explore a different facet of x-ray astronomy. Beginning with an introduction to the nature of image formation, we then move on to examples of how our imaging program, DS9, can aid our understanding of real satellite data. You will using the actual data that scientists use when doing their work. Nothing is "canned". You will be able to appreciate the excitement that astronomers felt when they made their important discoveries concerning periodic binary x-ray sources, supernovae and their remnants, and extragalactic sources that have shaped our understanding of cosmology.
