Antennae Galaxies: Difference between revisions

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v t e Galaxies
Morphology	Disc Lenticular barred unbarred Spiral anemic barred flocculent grand design intermediate Magellanic unbarred Dwarf galaxy elliptical irregular spheroidal spiral Elliptical galaxy cD Irregular barred Peculiar Ring Polar
Structure	Active galactic nucleus Bar Bulge Central massive object Galactic Center Dark matter halo Disc Disc galaxy Halo corona Galactic plane Galactic ridge Interstellar medium Protogalaxy Galaxy filament Spiral arm Supermassive black hole Ultramassive
Active nuclei	Blazar LINER Markarian Quasar BL Lacertae object Radio X-shaped DRAGN Relativistic jet Seyfert
Energetic galaxies	Lyman-alpha emitter Lyman-break Luminous infrared ULIRG HLIRG ELIRG Starburst blue compact dwarf pea faint blue Luminous infrared galaxy Hot dust-obscured Green bean galaxy Hanny's Voorwerp Wolf-Rayet galaxy
Low activity	Low surface brightness Ultra diffuse Dark galaxy Red nugget Blue Nugget Dead disk
Interaction	Field Galactic tide Groups and clusters group cluster Brightest cluster galaxy fossil group Interacting merger collision cannibalism Jellyfish Satellite Stellar stream Superclusters Walls Voids and supervoids void galaxy
Lists	Galaxies Galaxies named after people Largest Nearest Polar-ring Ring Spiral Groups and clusters Large quasar groups Quasars List of the most distant astronomical objects Starburst galaxies Superclusters Voids
See also	Extragalactic astronomy Galactic astronomy Galactic coordinate system Galactic habitable zone Galactic magnetic fields Galactic orientation Galactic quadrant Galaxy color–magnitude diagram Galaxy formation and evolution Galaxy rotation curve Gravitational lens Gravitational microlensing Illustris project Intergalactic dust Intergalactic stars Intergalactic travel Population III stars Galaxy X (galaxy)
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The Antennae Galaxies (Antennae for short), are a pair of galaxies (NGC 4038 + NGC 4039) undergoing a violent collision some 68 million ly away in the constellation Corvus. The galaxies are known as the 'Antennae' because the two long tails of stars, gas, and dust thrown out of the galaxies as a result of the collision resemble the antennae of an insect. The nuclei of the two galaxies are joining to become one supergalaxy. Most galaxies probably undergo at least one significant collision in their lifetimes. This is likely the future of our Milky Way when it collides with Andromeda. In 2004, a supernova (SN 2004gt) was obsered in NGC 4038.

Antennae's past

About 1.2 billion years ago, the Antennae were two seperate galaxies. NGC 4038 was a spiral galaxy and NGC 4039 was a barred spiral galaxy, even though they are still spiral and barred spiral. It may look like NGC 4038 is larger then NGC 4039, but befor they collieded, NGC 4039 was larger then NGC 4038. 900 million years ago, the Antennae started to get close to each other, looking sillilar to NGC 2207 and IC 2163. 600 million years ago, the Antennae already whent through each other, looking like the Mice Galaxies. 300 million years ago, the Antennae's stars began starting to be flung out of both galaxies. Today the two streamers of ejected stars extend far beyond the original galaxies, making the antennae shape.

Antennae's future

Within 400 million years, the Antennae's nuclei will colide and become a single core with stars, gas, and dust around it. With in a billion years the galaxy shall look like a normal galaxy, the 'Antenna Galaxy'. It's not 100% sure whether it'll be a spiral or a barred spiral galaxy. The brand new galaxy will go on for billions of years, maybe with more collisions in it's future.

File:Antennen-galaxies2.jpg

The full look at the Antennae,
NGC 4038 (top) and NGC 4039 (bottom)

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