Infrared Astronomy
Download
1 / 24

Infrared Light - PowerPoint PPT Presentation


  • 478 Views
  • Updated On :

Infrared Astronomy. Infrared Light. In 1800 William Herschel discovered “invisible light” It’s energy with all the same characteristics as visible light, but is not sensed by the human eye The light Herschel discovered was just beyond the red part of the spectrum. So it was named “infrared”.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Infrared Light' - medwin


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Infrared light l.jpg
Infrared Light

  • In 1800 William Herschel discovered “invisible light”

  • It’s energy with all the same characteristics as visible light, but is not sensed by the human eye

  • The light Herschel discovered was just beyond the red part of the spectrum. So it was named “infrared”


The spectrum of light l.jpg
The Spectrum of Light

  • Visible light is a tiny fraction of the Electromagnetic Spectrum

  • Gamma rays--billions of waves per inch

  • Radio waves--up to miles-long wavelengths

Low Energy Waves

High Energy Waves


The physics of light l.jpg

All objects in the Universe emit light depending on their temperature.

Cool objects emit primarily long wavelength light

Hot objects emit primarily short wavelength waves

The Physics of Light


The physics of light5 l.jpg

Objects emit light depending on their temperature. temperature.

The Physics of Light

Cool objects emit primarily long wavelength light

Hot objects emit primarily short wavelength light.

Human

Electric Stove

Lightning Bolt

Spot Light

Red Light

4,130° C (4,400 Kelvin)

Ultraviolet Light

30,000° C (30,273 Kelvin)

Infrared

33° C (306 Kelvin)

White Light

5,230° C (5,500 Kelvin)


The range of infrared light l.jpg
The Range of Infrared Light temperature.

Infrared light lies just beyond the red portion of the visible spectrum ("below red“). Infrared wavelengths are about 0.7 to 350 microns.

(amicron is one-millionth of one meter, or about 1/50th the width of a human hair).

Near Infrared

Mid Infrared



Getting the whole picture l.jpg
Getting the WHOLE picture temperature.

An object can look radically different depending on the type of light collected from it:

Since shortly after Herschel discovered infrared light astronomers have been observing astronomical objects in Infrared Light to get a more complete picture

Visible Light Image

Mid-Infrared Light Image


Why study infrared l.jpg
Why Study Infrared? temperature.

  • Visible: dark nebula, heavily obscured by interstellar dust (“Horsehead Nebula”)

  • Near-Infrared: dust is nearly transparent, embedded stars can be observed forming

  • Mid- and Far-Infrared: glow from cool dust is directly observable

Visible

Near Infrared

Mid-Infrared


Why study infrared10 l.jpg
Why Study Infrared? temperature.

  • Cool objects--like newly forming stars and solar systems--emit almost exclusively in the Infrared


Why study infrared11 l.jpg
Why Study Infrared? temperature.

Infrared penetrates intervening dust clouds, allowing us to see through or into them

Visible Light

Infrared


But there s a challenge l.jpg
But there’s a Challenge... temperature.

  • Earth’s atmospheric water vapor absorbs almost all incoming infrared radiation

  • Even mountain-top observatories get a limited view of the infrared universe

Infrared telescopes need to observe from high altitude or in space


Nasa s infrared missions l.jpg
NASA’s Infrared Missions temperature.

Spitzer Space Telescope

WISE

SOFIA

James Webb Space Telescope


Constellation orion l.jpg
Constellation Orion temperature.

Visible

Light


Slide15 l.jpg

Constellation Orion temperature.

Mid Infrared

Light

IRAS


Trifid nebula l.jpg
Trifid Nebula temperature.

Visible

Light

NOAO


Slide17 l.jpg

Trifid Nebula temperature.

Infrared

Light

Spitzer


Orion nebula l.jpg
Orion Nebula temperature.

Visible

Light


Slide19 l.jpg

Orion Nebula temperature.

Infrared

Light

Spitzer


Sombrero galaxy l.jpg
Sombrero Galaxy temperature.

Visible

Light

HST


Slide21 l.jpg

Sombrero Galaxy temperature.

Infrared

Light

Spitzer


Slide22 l.jpg

The Whole Sky temperature.

Visible Light - Axel Mellinger


Slide23 l.jpg

The Whole Sky temperature.

Near Infrared Light - 2MASS Survey


Slide24 l.jpg

The Whole Sky temperature.

Mid/Far Infrared Light - IRAS Survey


ad