What is radio astronomy
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What is Radio Astronomy?. MIT Haystack Observatory This material was developed under a grant from the National Science Foundation. The Electromagnetic Spectrum. Spans a range of wavelengths Visible is just a narrow range Radiowaves span a large range - from under 1mm to several meters.

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What is Radio Astronomy?

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What is radio astronomy

What is Radio Astronomy?

MIT Haystack Observatory

This material was developed under a grant from the National Science Foundation


The electromagnetic spectrum

The Electromagnetic Spectrum

  • Spans a range of wavelengths

  • Visible is just a narrow range

  • Radiowaves span a large range - from under 1mm to several meters


Sources of radio emission

Sources of Radio emission

  • Solar System - sun, planets

  • Milky way - star forming regions, old stars, supernova remnants

  • Extragalactic - quasars, radio jets

  • Molecules


Sun optical radio xray

SunOPTICAL RADIO XRAY


Saturn radio infrared optical ultraviolet

SaturnRADIO INFRARED OPTICAL ULTRAVIOLET


Orion nebula stars are born radio infrared optical xray

Orion Nebula: Stars are born…RADIO INFRARED OPTICAL XRAY


Crab nebula a star that died in 1054 radio optical xray

Crab Nebula: a star that died in 1054RADIO OPTICAL XRAY


Cassiopeia a a star that died in 1700 radio infrared optical xray

Cassiopeia A: a star that died in ~1700RADIO INFRARED OPTICAL XRAY


Sagittarius a mystery mass in galaxy center radio optical

Sagittarius A: Mystery Mass in Galaxy CenterRADIO OPTICAL


Virgo a hidden massive black hole shooting out a jet radio optical

Virgo A: Hidden Massive Black Hole shooting out a JetRADIO OPTICAL


Molecules

Molecules


What are molecules good for

What are molecules good for?

  • Detections - newest one - “glycoaldehyde” (sugar)

  • Probes - measure temperature, density, chemistry

  • Kinematics - velocities - doppler effect


What is radio astronomy

HC3N as a density probe

in the Taurus Molecular

Cloud (TMC-1)


What is radio astronomy

CH3CCH as a temperature probe in TMC-1


What is radio astronomy

Model of H2O maser emission around NGC4258


How do radio telescopes work

How do radio telescopes work?


What is resolution

What is Resolution?


Interferometry

Interferometry

Getting better “resolution”


What is radio astronomy

NRAO/AUI

Compare the radio image on the right, made with the Haystack 37-m single dish telescope at a frequency of 43 GHz with the radio image above made with the 27-element Very Large Array.


What is radio astronomy

VLBI images of SiO maser emission in Orion and a possible model


What is radio astronomy

SiO Masers around a highly evolved star - R Cassiopeia


What is radio astronomy

VLBI sequence of a supernova in M81


What is radio astronomy

Magnetic Fields in Active Galactic Nuclei

  • The Blazar 1055+018

    • Active Galactic Nuclei

    • 15 billion light years distant

    • AGN are 40 times more luminous and 10,000 times larger than the brightest “normal” galaxies

    • Displays a colossal jet of relativistic plasma

    • Powered by a supermassive, rotating black hole


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