Astro4Girls Sunnyvale Library Mar 20, 2012. What is Infrared light? Light itself is made up of lots...
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Transcript of Astro4Girls Sunnyvale Library Mar 20, 2012. What is Infrared light? Light itself is made up of lots...
![Page 1: Astro4Girls Sunnyvale Library Mar 20, 2012. What is Infrared light? Light itself is made up of lots of different “colors”. Raindrops and prisms pull.](https://reader035.fdocuments.in/reader035/viewer/2022062804/5697bf731a28abf838c7ee02/html5/thumbnails/1.jpg)
Astro4GirlsSunnyvale Library
Mar 20, 2012
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What is Infrared light?
Light itself is made up of lots of different “colors”. Raindrops and prisms pull those colors “apart”.
But … there is more light that we can’t see, both here ……………….. and here
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EVERYTHING THAT OUR EYES SEE IS WITHIN THIS SMALL WAVELENGTH RANGE!
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ELECTROMAGNETIC RADIATION SPECTRUM
DIFFERENT WAVELENGTHS CAUSE DIFFERENT “COLORS” OR TYPES OF “LIGHT”!
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Why Infrared Astronomy?
Infrared observations probe temperature differences within Infrared observations probe temperature differences within otherwise fairly cool things otherwise fairly cool things
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WHY INFRARED ASTRONOMY?
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Texas Christian University March 5, 2010Visible Near Infrared Mid-Infrared
At visible ’s, the star forming region appears as a dark nebula, heavily obscured by interstellar dust.
At near-infrared ’s, the dust is nearly transparent, revealing the dust-enshrouded stars in their formation phase
Mid and far-IR observations trace dust emission
Different wavelengths give unique information:
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Spectroscopy: another kind of picture-taking
Spectroscopy is like taking a picture of the light from something, spreading into a rainbow and recording that rainbow. Infrared spectroscopy is just imaging the infrared rainbow of an object
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Infrared spectrum is filled with lines created by molecules measurement of the strengths of these lines provides information regarding the temperature and composition.
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http://www.geologywales.co.uk/storms/index.htm
The stratosphere’s “temperature inversion” minimizes air turbulence, giving SOFIA: (1) a smooth ride, … and … (2) a nearly water-free environment
SOFIA
The Earth’s atmosphere is full of water
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Water in the atmosphere is BAD for infrared observations
SOFIA FLIES HIGH, WHERE THE INFRARED LIGHT IS!
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Occultation Astronomy with SOFIA
Earth
Motion of Occulting Object
Shadow of Occulting Object
MOBILITY!
Pluto occultation light curve observed on SOFIA on June 23, 2011
Time
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Example of a Flight Path
http://www.astropix.com
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AN INSIDE LOOK …
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Primary Mirror
Pressure Bulkhead
Light Tube
Spherical Hydraulic Bearing
Secondary Mirror
Infrared Light Mirror
Visible Light Mirror
HOW SOFIA WORKS
PRIMARY MIRROR
PRESSURE BULKHEAD
SCIENCE INSTRUMENT
(But first, let’s get oriented!)
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Primary MirrorVisible Light Camera
Pressure Bulkhead
Light Tube
Spherical Hydraulic Bearing
Secondary Mirror
Infrared Light Mirror
Visible Light Mirror
Infrared Instrument
HOW SOFIA WORKSIncoming Infrared Light
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