IR Compendium: M82 || SPITZER HOME || SPITZER SCIENCE || COMPENDIUM HOME || EXAMPLES INDEX ||

Table of Contents

• Basic information
• Infrared Fluxes
• Infrared Images
• Infrared Spectra
• Spitzer Observations
• Further Reading

Basic Information

• Common name: Messier 82

• Other names: APG 337, IRAS F09517+6954

• Position: RA= 09h55m52.19s Dec=+69d40m48.8s (J2000)

• Type: starburst galaxy

• Redshift: z=0.0007 (Brinkmann et al., 1995A&AS, 109, 147)

This object was extensively studied with ISO. Infrared imaging with ISOCAM reveals the spatial distribution of dust and gas emission with moderate angular resolution; in particular, the 3.3 micron image traces the distribution of the polycyclic aromatic hydrocarbons (PAHs). Spectrophotometry with the ISOCAM circular variable filter shows the strength of the PAH lines at 6.2, 7.7, 8.6, 11.3 microns. Spectroscopy with ISO-SWS maps the temperature distribution of ionized gas within the star forming region through measurements of [NeII] at 12.8 microns, [NeIII] at 15.6 microns and [SIII] at 18.7 microns. Additionally, spectroscopy with ISO-LWS is used to determine the degree of processing of the ISM as well as the age of the starburst through measurement of the [OI] 63 and 145 micron, [OIII] 52 and 88 micron, [NII] 122 micron, [NIII] 57 micron and [CII] 158 micron fine structure lines. Note that this object is expected to saturate the Spitzer photometers for long exposure times.

Infrared Fluxes

This SED was created using the sensitivity and saturation values available in November 2004. The black dots are the object surface brightness calculated by assuming the fluxes listed above are uniformly distributed throughout the beam sizes quoted in the reference papers. The green and red lines are the respective sensitivity and saturation limits for each instrument. The sensitivity values used are for a 5 sigma detection of an extended source with a 500 second exposure.

Infrared images

DSS R band (Search the DSS)

2MASS K band (Search the 2MASS Large Galaxy Atlas)

ISO-CAM 3.3 microns (Search the ISO archive)

ISO-CAM 4.05 microns (Search the ISO archive)

ISO-CAM 10.7 microns (Search the ISO archive)

5 degree IRAS 12 micron image centered on M82 ( Retrieve IRAS images using OASIS)

5 degree IRAS 100 micron image centered on M82 ( Retrieve IRAS images using OASIS)

VLA 20 cm (Search the NCSA Astronomy Digital Image Archive)

Infrared Spectra

4 to 16 micron spectra with ISO-CAM CVF filters (Search the ISO archive)

click on image for full 5 to 50 micron spectra with ISO-SWS (Search the ISO archive)

click on image for full 40 to 200 micron spectra with ISO-LWS (Search the ISO archive)

Spitzer Observations

• This object is part of a GTO programs for a spectroscopic study of star formation in interacting galaxies as well as Spitzer Infrared Nearby Galaxies Survey (Program ID numbers 21 and 159)
  (You can download the AORs (Astronomical Observation Requests) for this object into Spot by using "View Program" under the "File" menu and entering these program IDs.)
• Search the ROC for planned observations

Further reading

• The 2MASS Large Galaxy Atlas, Jarrett, T.H., Chester, T., Cutri, R., Schneider, S.E., Huchra, J.P., 2003, AJ, 125, 525.
• Massive Star Formation and Evolution in Starburst Galaxies: Mid-infrared Spectroscopy with the ISO Short Wavelength Spectrometer, Thornley, M. D., Schreiber, N. M. F., Lutz, D., Genzel, R., Spoon, H. W. W., Kunze, D., Sternberg, A., 2000, ApJ, 539, 641.
• ISO-SWS spectra of galaxies: Continuum and features, Sturm, E., Lutz, D., Tran, D., Feuchtgruber, H., Genzel, R., Kunze, D., Moorwood, A. F. M., Thornley, M. D, 2000, A&AS, 358, 481.
• ISO LWS Spectroscopy of M82: A Unified Evolutionary Model, Colbert, J.W., Malkan, M.A., Clegg, P. E., Cox, P., Fischer, J., Lord, S. D., Luhman, M., Satyapal, S., Smith, H. A., Spinoglio, L., Stacey, G., Unger, S. J., 1999, ApJ, 511, 721.