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M 101 Combined X-Ray and Optical Image


Minimum credit line: Image courtesy of Rosemary Willatt (ESAC) and ESA. (for details, see Conditions of Use).
Credit: ESA/XMM-Newton, CC BY-SA 3.0 IGO

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About this Image

The image shows an XMM-Newton EPIC image (colour) overlayed onto an optical Digitised Sky Survey image of the spiral galaxy M101 (greyscale). The XMM-Newton image comprises data from the MOS and pn cameras, and is false coloured as follows: low energy (0.2-1.0 keV) photons are shown in red, medium energy (1.0-2.0 keV) in green, and high energy (2.0-12 keV) in blue. The Digitised Sky Survey image of the galaxy was taken in the blue optical band and has been displayed in inverted greyscale (areas of emission are seen as black against a white background) so that the X-ray image can be seen through it.
The combined image shows correpondence in the spiral arms between X-ray and optical emission. The nucleus is also clearly seen in the X-ray particularly the circumnuclear region in the low energy emission.

Investigator(s):  M. Watson and K. Kuntz

For More Information
  • Visit related website;
  • Detailed description of this image

  • Instrument EPIC
    Observing Mode Full Frame
    Filter N/A
    Date of Observation 2005-01-08
    Image size 30.00 x 30.00 arcmin
    Detailed Caption The observations were taken on June 6th 2002, July 7th 2004 and January 1st 2005. The MOS and pn cameras were operated in full frame mode in all exposures, with medium filters in the 2002 and 2004 exposures and thin filters in 2005. The total exposure times after cleaning for periods of high background were around 90 ks for each camera.

  • Query XSA archive for XMM-Newton data in the field of M 101
  • Astronomical database entries for M 101;
  • For unfamiliar terms, visit the XMM-Newton Astronomical Glossary

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