Two views of a lopsided galaxy
Scientists think the Meathook Galaxy’s appearance is due to gravitational interactions with another galaxy at some point in its history.
May 4, 2011
The Meathook Galaxy (NGC 2442) has a dramatically lopsided shape. One spiral arm is tightly folded in on itself and host to a recent supernova, while the other is dotted with recent star formation and extends far out from the nucleus. The MPG/European Southern Observatory’s (ESO) 2.2-meter telescope and the NASA/European Space Agency’s (ESA) Hubble Space Telescope have captured two contrasting views of this asymmetric spiral galaxy.
This picture of the Meathook Galaxy (NGC 2442) was taken by the Wide Field Imager on the MPG/ESO 2.2-meter telescope at La Silla, Chile. It shows a much broader view than the Hubble image, although less detailed. This view includes the whole galaxy and the surrounding sky, and clearly shows the asymmetric spiral arms. The longer of the two arms has intense star formation, which is visible here as a pink glow: this is due to the radiation of young stars ionising the gas they form from. The asymmetric shape and star formation are both thought to be caused by tidal disruptions from a near-miss with another galaxy at some point in its history. ESO
The Meathook Galaxy in the southern constellation Volans the Flying Fish is easily recognized for its asymmetric spiral arms. The galaxy’s lopsided appearance is thought to be due to gravitational interactions with another galaxy at some point in its history, although astronomers have so far not been able to positively identify the culprit.
This broad view taken by the Wide Field Imager on the MPG/ESO 2.2-meter telescope at La Silla, Chile, very clearly shows the double hook shape that gives the galaxy its nickname. This image also captures several other galaxies close to NGC 2442 as well as many more remote galaxies that form a rich backdrop. Although the Wide Field Imager on the ground cannot approach the sharpness of images from Hubble in space, it can cover a bigger section of sky in a single exposure. The two tools often provide complementary information to astronomers.
A close-up image from the NASA/ESA Hubble Space Telescope focuses on the galaxy’s nucleus and the more compact of its two spiral arms. In 1999, a massive star at the end of its life exploded in this arm into a supernova. By comparing older ground-based observations, previous Hubble images made in 2001, and these shots taken in late 2006, astronomers have been able to study in detail what happened to the star in its dying moments. By the time of this image, the supernova has faded and is not visible.
This close-up Hubble view of the Meathook Galaxy (NGC 2442) focuses on the more compact of its two asymmetric spiral arms as well as the central regions. The spiral arm was the location of a supernova that exploded in 1999. These observations were made in 2006 in order to study the aftermath of this supernova. Ground-based data from MPG/ESO 2.2-meter telescope were used to fill out parts of the edges of this image. NASA/ESA/ESO
The ESO’s observations also highlight the other end of the life cycle of stars from Hubble. Dotted across much of the galaxy, and particularly in the longer of the two spiral arms, are patches of pink and red. This color comes from hydrogen gas in star-forming regions. As the powerful radiation of newborn stars excites the gas in the clouds they formed from, it glows a bright shade of red.
The interaction with another galaxy that gave the Meathook Galaxy its unusual asymmetric shape is also likely to have been the trigger of this recent episode of star formation. The same tidal forces that deformed the galaxy disrupted clouds of gas and triggered their gravitational collapse.