Telescopes

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4

Radio

Ground-based

Millimeter wave

High and dry

Sub-millimeter

Even higher and drier

Slide 38

Location of infrared and optical telescopes

Infrared

High and dry

Optical

Ground-based

Slide 39

Location of ultraviolet, xray, and gamma ray telescopes

Ultraviolet

Space

Xray

Space

Gamma ray

Ground-based and Space

Slide 40

Types of EM radiation

Astronomers often group the different types of EM radiation into 3 groups according to their energy.

Slide 41

Types of EM radiation

Low frequency/long wavelength LOW ENERGY

Radio

Millimeter

Sub-millimeter

Mid frequency/mid wavelength MID ENERGY

Infrared

Optical

High frequency/short wavelength HIGH ENERGY

Ultraviolet

X-ray

Gamma ray

Slide 42

Types of telescopes

For each energy range, we’ll discuss:

Single telescopes

Interferometers

More than one telescope linked together

Slide 43

Types of EM radiation

Low frequency/long wavelength LOW ENERGY

Radio

Millimeter

Sub-millimeter

Mid frequency/mid wavelength MID ENERGY

Infrared

Optical

High frequency/short wavelength HIGH ENERGY

Ultraviolet

X-ray

Gamma ray

Slide 44

Radio, millimeter, and submillimeter astronomy

The place of radio, millimeter, and submillimeter astronomy the study of astronomy

The parts of a radio telescope and how it works

The two big challenges of radio astronomy overcome by radio astronomers

Tiny signal strength of radio signals

Low angular resolution

Next generation radio, millimeter, and submillimeter telescopes

Slide 45

Low energy EM radiation

Slide 46

Discovery of CMB

Arno Penzias and Robert Wilson (1965)

Slide 47

Discovery of pulsars

Jocelyn Bell and 81.5 MHz radio telescope (1967)

Slide 48

Sources of radio, millimeter, and sub-millimeter radiation

HII regions

Synchrotron radiation