Digital Universe Guide - Hayden Planetarium

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118 3. THE MILKY WAY ATLAS nearby star-forming regions, are bright. The Andromeda Galaxy is visible but faint, and the Rho Ophiuchi cloud is visible above Scorpius.
3.3. MILKY WAY DATA GROUPS 119 3.3.26 Two Micron (2MASS) All-Sky Survey Group Name mw2MASS Reference Two Micron All-Sky Survey (UMass, IPAC/CalTech, NASA, NSF) Prepared by Tom Jarrett (IPAC/CalTech), Brian Abbott (AMNH/<strong>Hayden</strong>) Labels No Files mw-2mass.speck Dependencies mw-2mass-1024.sgi Wavelength 1.24, 1.66, 2.16 microns Frequency 241,936, 180,723, 138,889 GHz The Two Micron All-Sky Survey (2MASS) is an infrared (IR) survey of the sky. Because it is looking in the IR and this is a composite of the 2MASS point-source catalog, most of the light from this survey is starlight. In visible light, clouds of gas and dust obscure our view. However, in IR the longer wavelengths of light can penetrate these clouds without being scattered, thereby revealing stars that would normally be hidden to our eye. The 2MASS data were taken over 1,400 nights from 1997 to 2001 with two, 1.3-meter telescopes located on Mt. Hopkins, Arizona, and Cerro Tololo, Chile. Each telescope had identical IR detectors that could observe light at 1.24, 1.66, and 2.16 micron wavelengths. The 2MASS Image Atlas contains more than 4 million images in these wavelengths that cover 99.998% of the sky. The 2MASS image contains many point sources. If you turn up the image’s brightness (using the Alpha Slider) and turn off the stars, you will see many of the stars in the image align with the constellation outlines. Many of the stars, particularly cooler stars, shine in the infrared. If you look toward Orion, you’ll see many of the hotter stars in that constellation are not visible or as bright. Conversely, Betelgeuse, the red giant, is bright, radiating much of its light in the infrared. The Galaxy itself is quite prominent, with the bright disk and the Galactic bulge toward the center of the Milky Way and virtually no disk showing toward Orion, away from Galactic center. Clouds of gas and dust are also apparent and are a brownish color, correlating exactly with the carbon monoxide all-sky survey (mwCO group). You will see some distortion artifacts toward the Galactic poles. This is from the process of wrapping the image on a sphere. Few features pop out as they do on other surveys. The Large and Small Magellanic Clouds are visible, as is the glow of the Pleiades star cluster, but beyond these, the survey is mainly starlight.
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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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3.2. MILKY WAY ATLAS TUTORIAL 29 Wi
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3.2. MILKY WAY ATLAS TUTORIAL 31 Yo
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3.2. MILKY WAY ATLAS TUTORIAL 39 co
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3.2. MILKY WAY ATLAS TUTORIAL 45 In
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3.2. MILKY WAY ATLAS TUTORIAL 47 No
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3.2. MILKY WAY ATLAS TUTORIAL 51 to
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3.2. MILKY WAY ATLAS TUTORIAL 55 th
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3.2. MILKY WAY ATLAS TUTORIAL 57 bi
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3.2. MILKY WAY ATLAS TUTORIAL 59 in
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3.2. MILKY WAY ATLAS TUTORIAL 63 mo
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3.2. MILKY WAY ATLAS TUTORIAL 65 fa
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Page 145 and 146: 4 The Extragalactic Atlas The word
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4.3. EXTRAGALACTIC DATA GROUPS 169
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4.4. OPTIMIZING THE EXTRAGALACTIC A
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Appendix A Light-Travel Time and Di
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Appendix B Parallax and Distance On
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absolute magnitude M, can be calcul
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discovered that there was a linear
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Appendix D Electromagnetic Spectrum
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Appendix E Constants and Units In a
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Metric Prefixes These prefixes are
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INDEX 221 center command, 50, 61 cl
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INDEX 223 Earth’s radio signals,
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INDEX 225 irregular galaxy, 147, 17
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INDEX 227 entering, 21 every, 206 j
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INDEX 229 stellar distance uncertai
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Digital Universe Guide - Hayden Planetarium

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