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Superwind Galaxy NGC 4666

Date:
September 13, 2010
Source:
European Southern Observatory - ESO
Summary:
The galaxy NGC 4666 takes pride of place at the centre of this new image, made in visible light with the Wide Field Imager on the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile. NGC 4666 is a remarkable galaxy with very vigorous star formation and an unusual "superwind" of out-flowing gas. It had previously been observed in X-rays by the ESA XMM-Newton space telescope, and the image presented here was taken to allow further study of other objects detected in the earlier X-ray observations.

The superwind galaxy NGC 4666.
Credit: ESO/J. Dietrich

The galaxy NGC 4666 takes pride of place at the centre of this new image, made in visible light with the Wide Field Imager on the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile. NGC 4666 is a remarkable galaxy with very vigorous star formation and an unusual “superwind” of out-flowing gas. It had previously been observed in X-rays by the ESA XMM-Newton space telescope, and the image presented here was taken to allow further study of other objects detected in the earlier X-ray observations.

The prominent galaxy NGC 4666 in the centre of the picture is a starburst galaxy, about 80 million light-years from Earth, in which particularly intense star formation is taking place. The starburst is thought to be caused by gravitational interactions between NGC 4666 and its neighbouring galaxies, including NGC 4668, visible to the lower left. These interactions often spark vigorous star-formation in the galaxies involved.

A combination of supernova explosions and strong winds from massive stars in the starburst region drives a vast flow of gas from the galaxy into space -- a so-called "superwind." The superwind is huge in scale, coming from the bright central region of the galaxy and extending for tens of thousands of light-years. As the superwind gas is very hot it emits radiation mostly as X-rays and in the radio part of the spectrum and cannot be seen in visible light images such as the one presented here.

This image was made as part of a follow-up to observations made with the ESA XMM-Newton space telescope in X-rays. NGC 4666 was the target of the original XMM-Newton observations, but thanks to the telescope's wide field-of-view many other X-ray sources were also seen in the background. One such serendipitous detection is a faint galaxy cluster seen close to the bottom edge of the image, right of centre. This cluster is much further away from us than NGC 4666, at a distance of about three billion light-years.

In order to fully understand the nature of astronomical objects, researchers must study them at several wavelengths. This is because light of different wavelengths can tell us about different physical processes taking place. In this case the Wide Field Imager (WFI) observations were made in visible light to further investigate these serendipitously detected X-ray objects -- a good example of how astronomers using different telescopes work together to explore the Universe.


Story Source:

The above story is based on materials provided by European Southern Observatory - ESO. Note: Materials may be edited for content and length.


Journal Reference:

  1. J. P. Dietrich, J.-M. Miralles, L. F. Olsen, L. da Costa, A. Schwope, C. Benoist, V. Hambaryan, A. Mignano, C. Motch, C. Ritι, R. Slijkhuis, J. Tedds, B. Vandame, M. G. Watson, S. Zaggia. ESO imaging survey: optical follow-up of 12 selected XMM-Newton fields. Astronomy and Astrophysics, 2006; 449 (2): 837 DOI: 10.1051/0004-6361:20053785

Cite This Page:

European Southern Observatory - ESO. "Superwind Galaxy NGC 4666." ScienceDaily. ScienceDaily, 13 September 2010. <www.sciencedaily.com/releases/2010/09/100901073446.htm>.
European Southern Observatory - ESO. (2010, September 13). Superwind Galaxy NGC 4666. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2010/09/100901073446.htm
European Southern Observatory - ESO. "Superwind Galaxy NGC 4666." ScienceDaily. www.sciencedaily.com/releases/2010/09/100901073446.htm (accessed July 31, 2014).

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