What is Radio Astronomy? MIT Haystack Observatory This material was developed under a grant from the National Science Foundation.

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Presentation transcript:

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

Sun OPTICAL RADIO XRAY

Saturn RADIO INFRARED OPTICAL ULTRAVIOLET

Orion Nebula: Stars are born… RADIO INFRARED OPTICAL XRAY

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

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

Sagittarius A: Mystery Mass in Galaxy Center RADIO OPTICAL

Virgo A: Hidden Massive Black Hole shooting out a Jet RADIO OPTICAL

Molecules

What are molecules good for? Detections - newest one - “glycoaldehyde” (sugar) Probes - measure temperature, density, chemistry Kinematics - velocities - doppler effect

HC 3 N as a density probe in the Taurus Molecular Cloud (TMC-1)

CH 3 CCH as a temperature probe in TMC-1

Model of H 2 O maser emission around NGC4258

How do radio telescopes work?

What is Resolution?

Interferometry Getting better “resolution”

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. NRAO/AUI

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

The Blazar –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 Magnetic Fields in Active Galactic Nuclei

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