Digital Universe Guide - Hayden Planetarium

More documents

Recommendations

Info

112 3. THE MILKY WAY ATLAS This image is composed of many photographs of the sky, carefully knitted together in this giant mosaic. The stars have been removed for the most part, but the bright stars show some residual light.
3.3. MILKY WAY DATA GROUPS 113 3.3.22 Atomic Hydrogen Survey Group Name mwH Reference Atlas of Galactic Neutral Hydrogen (Hartmann+, 1997) Prepared by Brian Abbott (AMNH/<strong>Hayden</strong>) Labels No Files mw-21cm.speck Dependencies 02-21cm-512.sgi Wavelength 21 cm Frequency 1.42 GHz Warm neutral hydrogen radiates in the radio spectrum at a wavelength of 21 centimeters. In the hydrogen atom, the electron and proton are magnetized, giving each a north and south pole just like a bar magnet. Any particular neutral hydrogen atom can exist in two configurations: a lower energy state, in which the north poles of the electron and proton are pointing in the same direction, and a higher energy state, in which they point in opposite directions. The warm interstellar gas provides the energy to boost the atom into this higher energy state. Once the atom returns to its lower energy state, it gives off energy at a wavelength of 21 cm. The low-energy light in this survey reflects the small difference between these atomic states. This radiation is important because it penetrates the dust in the interstellar medium, allowing us to see it across the galaxy. The 21-cm light is perhaps the most important tracer we have for determining the structure of our Galaxy. The false colors in the survey represent the density of atomic hydrogen along a line of sight. White and red represent highly dense regions of hydrogen gas, while blue and purple are regions of lower density. These measurements, combined with the Doppler shift of the light, give us an idea of the structure of the Milky Way’s hydrogen gas clouds.
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: 3.2. MILKY WAY ATLAS TUTORIAL 61 3.
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 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 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 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 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: 3.3. MILKY WAY DATA GROUPS 111 3.3.
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 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 163 and 164:
4.2. EXTRAGALACTIC ATLAS TUTORIAL 1
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
4.3. EXTRAGALACTIC DATA GROUPS 169
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
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?