Digital Universe Guide - Hayden Planetarium

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192 4. THE EXTRAGALACTIC ATLAS Notable Clusters One way to see the superclusters is to filter Abell by the notable index. Each Abell cluster has a notable index that is either 1, meaning the cluster is attached to a large supercluster, or zero, meaning it is relatively isolated. Type see supercl, and 313 galaxy clusters in about two dozen superclusters will remain. Type see all to return all the galaxy clusters to view. Labels Two sets of labels describe the Abell data group, the supercluster labels and the individual cluster labels. The handful of large, white labels describe supercluster positions. Approach a particular Abell cluster and you will see a blue-green label pop on, revealing its Abell catalog number. Of course, you can adjust the appearance and visibility of these labels using the labelsize and labelminpixels commands.
4.3. EXTRAGALACTIC DATA GROUPS 193 4.3.13 Two-degree Field Galaxy Survey Group Name 2dFgals Reference 2dF Galaxy Redshift Survey (Colless+ 2003) Prepared by Eric Gawiser (Rutgers University) Labels No Files 2dfgals.speck Dependencies none Census 229,293 galaxies The Two-degree Field (2dF) Survey is a project designed to map portions of the extragalactic <strong>Universe</strong>. Mapping the <strong>Universe</strong>’s structure provides astronomers with constraints on its formation and evolution. The 2dF instrument is mounted on the 3.9-meter (12.8-foot) Anglo-Australian Telescope (AAT), located 450 km (280 miles) northwest of Sydney. The telescope has a 2-degree field of view on the sky, enabling large parts of the sky to be observed at one time. For each pointing of the telescope, the instrument can acquire up to 400 spectra simultaneously via optical fibers that feed into two spectrographs. The spectrographs see light that is between 350 nm and 800 nm, spanning the visible spectrum. The survey was conducted from the extended APM Galaxy Survey. This catalog was derived from the Southern Sky Survey, taken by the UK Schmidt Telescope and scanned by the Automated Plate Measuring (APM) Machine. This extended catalog contains more than 5 million galaxies that span the north and south Galactic hemispheres. The 2dF survey has three main components: the north Galactic pole strip, the south Galactic pole strip, and the random fields that surround the south Galactic pole strip. The galaxy survey is composed of about 230,000 galaxies with brightness and redshift measurements. For information on converting redshift to distance, please see “Redshift and Distance.”
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The Digital Universe Guide Brian Ab
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Contents Contents 3 List of Tables
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List of Tables 2.1 Log and Linear F
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1.2. GETTING HELP 7 1.2 Getting Hel
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1.5. ACKNOWLEDGMENTS 9 1.5 Acknowle
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2.2. LAUNCHING THE MILKY WAY ATLAS
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2.3. LEARNING TO FLY PARTIVIEW 13 T
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2.3. LEARNING TO FLY PARTIVIEW 15 M
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2.4. PARTIVIEW’S USER INTERFACE 1
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2.5. DIGITAL UNIVERSE FILES 23 File
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3.1. MILKY WAY ATLAS OVERVIEW 25 3.
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3.2. MILKY WAY ATLAS TUTORIAL 27 3.
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3.3. MILKY WAY DATA GROUPS 67 Earth
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3.3. MILKY WAY DATA GROUPS 69 Data
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3.3. MILKY WAY DATA GROUPS 73 3.3.3
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Page 145 and 146: 4 The Extragalactic Atlas The word
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Page 207 and 208: Appendix A Light-Travel Time and Di
Page 209 and 210: Appendix B Parallax and Distance On
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Page 215 and 216: Appendix D Electromagnetic Spectrum
Page 217 and 218: Appendix E Constants and Units In a
Page 219 and 220: Metric Prefixes These prefixes are
Page 221 and 222: INDEX 221 center command, 50, 61 cl
Page 223 and 224: INDEX 223 Earth’s radio signals,
Page 225 and 226: INDEX 225 irregular galaxy, 147, 17
Page 227 and 228: INDEX 227 entering, 21 every, 206 j
Page 229: INDEX 229 stellar distance uncertai
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Digital Universe Guide - Hayden Planetarium

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