Digital Universe Guide - Hayden Planetarium

More documents

Recommendations

Info

182 4. THE EXTRAGALACTIC ATLAS Sharp/NOAO/AURA/NSF), M101 (George Jacoby, Bruce Bohannan, Mark Hanna/NOAO/AURA/NSF), M51 (Todd Boroson/NOAO/AURA/NSF), and Centaurus A (Eric Peng, Herzberg Institute of Astrophysics and NOAO/AURA/NSF). Each of these images has been altered from its original state. These images were taken from Earth on some of the world’s largest telescopes, so foreground stars from our own Galaxy appear in each image. We are representing galaxies in extragalactic space, where stars would not appear as large, bright objects. So, we have removed the stars from each image from NOAO. For a description of the cluster, filament, and void structure in these data, we direct you to the associated tutorials: “Local Large-Scale Structure” and “Tully’s Nearby Galaxies.”
4.3. EXTRAGALACTIC DATA GROUPS 183 4.3.10 Tully’s Smoothed Density Surfaces Group Name isoDensity Reference Tully 8,000 km/s Galaxy Catalog Prepared by R. Brent Tully (U Hawaii) Stuart Levy (NCSA/U Illinois) Labels No Files d16 100 u02 50k.obj, d16 200 u02 10k.obj Dependencies none Accompanying the Tully galaxy catalog (Tully) is a model of the density of the 28,000 galaxies in that catalog. These appear as 3-D surfaces surrounding the most dense regions of galaxies. Each surface represents points of constant density. After smoothing the galaxy data, that is, averaging these data to compensate for random fluctuations, a 3-D mapping of the overall density may be displayed as surfaces of constant value. The surfaces represent two values of constant density. The blue, inner surface is a relatively high density, while the aqua, outer surface represents a lower density. The blue contours mainly show dense galaxy clusters, like the Virgo Cluster, Fornax Cluster, and most of the Abell clusters in the Tully data group. These are the regions of highest density in our local <strong>Universe</strong>. Some of the aqua contours resemble the blue contours in shape, but more often they reveal larger structures that connect blue contours together. The largest feature appears on the edge of the data cube and is called the Great Wall. Brighten up the Tully galaxies and, while it’s still the active group, type see gw. This removes all the galaxies except those in the enormous Great Wall structure, which follow the density contours closely. Type see all to return all the Tully galaxies to view. Isolating the Isosurfaces If you desire to see just one of the isosurfaces, then you must change the color of the surface you wish to remove. In the extragalactic.cf file, the blue and aqua colors have a color index of 1 and 2, respectively, and are assigned these default red-green-blue colors: cment 1 0 0 1 (blue) cment 2 0.0 0.2 0.35 (aqua) To see the aqua contours alone, change the blue contours to black with the command cment 1 0 0 0. Then, to emphasize the aqua contours, increase their alpha value using the Alpha Slider. The higher the value, the more opaque the surfaces become. Set alpha to its maximum value of 1 and the surfaces
Page 1 and 2:
The Digital Universe Guide Brian Ab
Page 3 and 4:
Contents Contents 3 List of Tables
Page 5 and 6:
List of Tables 2.1 Log and Linear F
Page 7 and 8:
1.2. GETTING HELP 7 1.2 Getting Hel
Page 9 and 10:
1.5. ACKNOWLEDGMENTS 9 1.5 Acknowle
Page 11 and 12:
2.2. LAUNCHING THE MILKY WAY ATLAS
Page 13 and 14:
2.3. LEARNING TO FLY PARTIVIEW 13 T
Page 15 and 16:
2.3. LEARNING TO FLY PARTIVIEW 15 M
Page 17 and 18:
2.4. PARTIVIEW’S USER INTERFACE 1
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
2.5. DIGITAL UNIVERSE FILES 23 File
Page 25 and 26:
3.1. MILKY WAY ATLAS OVERVIEW 25 3.
Page 27 and 28:
3.2. MILKY WAY ATLAS TUTORIAL 27 3.
Page 29 and 30:
3.2. MILKY WAY ATLAS TUTORIAL 29 Wi
Page 31 and 32:
3.2. MILKY WAY ATLAS TUTORIAL 31 Yo
Page 33 and 34:
3.2. MILKY WAY ATLAS TUTORIAL 33 th
Page 35 and 36:
3.2. MILKY WAY ATLAS TUTORIAL 35 Op
Page 37 and 38:
Page 39 and 40:
3.2. MILKY WAY ATLAS TUTORIAL 39 co
Page 41 and 42:
3.2. MILKY WAY ATLAS TUTORIAL 41 li
Page 43 and 44:
Page 45 and 46:
3.2. MILKY WAY ATLAS TUTORIAL 45 In
Page 47 and 48:
3.2. MILKY WAY ATLAS TUTORIAL 47 No
Page 49 and 50:
3.2. MILKY WAY ATLAS TUTORIAL 49 Th
Page 51 and 52:
3.2. MILKY WAY ATLAS TUTORIAL 51 to
Page 53 and 54:
3.2. MILKY WAY ATLAS TUTORIAL 53 st
Page 55 and 56:
3.2. MILKY WAY ATLAS TUTORIAL 55 th
Page 57 and 58:
3.2. MILKY WAY ATLAS TUTORIAL 57 bi
Page 59 and 60:
3.2. MILKY WAY ATLAS TUTORIAL 59 in
Page 61 and 62:
Page 63 and 64:
3.2. MILKY WAY ATLAS TUTORIAL 63 mo
Page 65 and 66:
3.2. MILKY WAY ATLAS TUTORIAL 65 fa
Page 67 and 68:
3.3. MILKY WAY DATA GROUPS 67 Earth
Page 69 and 70:
3.3. MILKY WAY DATA GROUPS 69 Data
Page 71 and 72:
3.3. MILKY WAY DATA GROUPS 71 The l
Page 73 and 74:
3.3. MILKY WAY DATA GROUPS 73 3.3.3
Page 75 and 76:
Page 77 and 78:
3.3. MILKY WAY DATA GROUPS 77 If yo
Page 79 and 80:
3.3. MILKY WAY DATA GROUPS 79 lumin
Page 81 and 82:
3.3. MILKY WAY DATA GROUPS 81 not p
Page 83 and 84:
3.3. MILKY WAY DATA GROUPS 83 Two p
Page 85 and 86:
3.3. MILKY WAY DATA GROUPS 85 expre
Page 87 and 88:
3.3. MILKY WAY DATA GROUPS 87 marke
Page 89 and 90:
3.3. MILKY WAY DATA GROUPS 89 brigh
Page 91 and 92:
Page 93 and 94:
3.3. MILKY WAY DATA GROUPS 93 inclu
Page 95 and 96:
3.3. MILKY WAY DATA GROUPS 95 old.
Page 97 and 98:
3.3. MILKY WAY DATA GROUPS 97 centi
Page 99 and 100:
Page 101 and 102:
3.3. MILKY WAY DATA GROUPS 101 3.3.
Page 103 and 104:
3.3. MILKY WAY DATA GROUPS 103 heat
Page 105 and 106:
Page 107 and 108:
3.3. MILKY WAY DATA GROUPS 107 righ
Page 109 and 110:
3.3. MILKY WAY DATA GROUPS 109 beyo
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
3.3. MILKY WAY DATA GROUPS 121 Othe
Page 123 and 124:
3.3. MILKY WAY DATA GROUPS 123 abou
Page 125 and 126:
3.3. MILKY WAY DATA GROUPS 125 Obje
Page 127 and 128:
Page 129 and 130:
Page 131 and 132: 3.3. MILKY WAY DATA GROUPS 131 3.3.
Page 141 and 142: 3.3. MILKY WAY DATA GROUPS 141 this
Page 143 and 144: 3.3. MILKY WAY DATA GROUPS 143 Not
Page 145 and 146: 4 The Extragalactic Atlas The word
Page 147 and 148: 4.1. EXTRAGALACTIC ATLAS OVERVIEW 1
Page 153 and 154: 4.2. EXTRAGALACTIC ATLAS TUTORIAL 1
Page 169 and 170: 4.3. EXTRAGALACTIC DATA GROUPS 169
Page 181: 4.3. EXTRAGALACTIC DATA GROUPS 181
Page 205 and 206: 4.4. OPTIMIZING THE EXTRAGALACTIC A
Page 207 and 208: Appendix A Light-Travel Time and Di
Page 209 and 210: Appendix B Parallax and Distance On
Page 211 and 212: absolute magnitude M, can be calcul
Page 213 and 214: discovered that there was a linear
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
show all

Digital Universe Guide - Hayden Planetarium

Create successful ePaper yourself

Delete template?

Save as template?