What is radio astronomy
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What is Radio Astronomy? PowerPoint PPT Presentation


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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?

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


Sources of Radio emission

  • Solar System - sun, planets

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

  • Extragalactic - quasars, radio jets

  • Molecules


SunOPTICAL RADIO XRAY


SaturnRADIO INFRARED OPTICAL ULTRAVIOLET


Orion Nebula: Stars are born…RADIO INFRARED OPTICAL XRAY


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


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


Sagittarius A: Mystery Mass in Galaxy CenterRADIO OPTICAL


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


Molecules


What are molecules good for?

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

  • Probes - measure temperature, density, chemistry

  • Kinematics - velocities - doppler effect


HC3N as a density probe

in the Taurus Molecular

Cloud (TMC-1)


CH3CCH as a temperature probe in TMC-1


Model of H2O maser emission around NGC4258


How do radio telescopes work?


What is Resolution?


Interferometry

Getting better “resolution”


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.


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


SiO Masers around a highly evolved star - R Cassiopeia


VLBI sequence of a supernova in M81


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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