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Table of Contents

• Basic information
• Infrared Fluxes
• Spectral Energy Distributions
• Infrared Images
• Infrared Spectra
• SIRTF Observations
• Further Reading

Basic Information

• Common name:Messier 81

• Other names:NGC 3031, IRAS 09514+6918

• Position: RA=09h55m33.2s Dec=+69d03m55s

• Type: Sb AGN

• Redshift: -0.000133 (Third Reference Cat. of Bright Galaxies (RC3) (de Vaucouleurs+ 1991))

Infrared Fluxes

Spectral Energy Distributions

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

(Search the DSS)

2MASS K band (Search the 2MASS Quicklook Image Server)

Spitzer 3.6 micron imaging with IRAC from Willner et al, 2004, ApJS, 154,222 (Willner et al, 2004, ApJS, 154,222 or retrieve data using Leopard, AOR ID 6629120)

Spitzer 4.5 micron imaging with IRAC from Willner et al, 2004, ApJS, 154,222 (Willner et al, 2004, ApJS, 154,222 or retrieve data using Leopard, AOR ID 6629120)

Spitzer 5.8 micron imaging with IRAC from Willner et al, 2004, ApJS, 154,222 (Willner et al, 2004, ApJS, 154,222 or retrieve data using Leopard, AOR ID 6629120)

Spitzer 8.0 micron imaging with IRAC from Willner et al, 2004, ApJS, 154,222 (Willner et al, 2004, ApJS, 154,222 or retrieve data using Leopard, AOR ID 6629120)

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

Spitzer 24 micron imaging with MIPS (Retrieve data using Leopard, AOR ID 7864576)

5 degree IRAS 25 micron image centered on Fomalhaut ( Retrieve IRAS images using OASIS)

5 degree IRAS 60 micron image centered on Fomalhaut ( Retrieve IRAS images using OASIS)

Spitzer 70 micron imaging with MIPS (Retrieve data using Leopard, AOR ID 7864576)

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

Spitzer 160 micron imaging with MIPS (Retrieve data using Leopard, AOR ID 7864576)

Infrared Spectra

click image for full 2 to 12 micron spectra with ISO-PHT (Search the ISO archive)

Spitzer Observations

• This object is part of the SINGS Legacy Project, as well as Early Release Observations in program numbers 1035 and 717
  (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

• Spatially Resolved Ultraviolet, Hα, Infrared, and Radio Star Formation in M81, Gordon, K. D., Pérez-González, P. G., Misselt, K. A., Murphy, E. J., Bendo, G. J., Walter, F., Thornley, M. D., Kennicutt, R. C., Jr., Rieke, G. H., Engelbracht, C. W., Smith, J.-D. T., Alonso-Herrero, A., Appleton, P. N., Calzetti, D., Dale, D. A., Draine, B. T., Frayer, D. T., Helou, G., Hinz, J. L., Hines, D. C., Kelly, D. M., Morrison, J. E., Muzerolle, J., Regan, M. W., Stansberry, J. A., Stolovy, S. R., Storrie-Lombardi, L. J., Su, K. Y. L., Young, E. T., 2004, ApJS, 154, 215.
• Infrared Array Camera (IRAC) Observations of M81, Willner, S. P., Ashby, M. L. N., Barmby, P., Fazio, G. G., Pahre, M., Smith, H. A., Kennicutt, Robert C., Jr., Calzetti, Daniela, Dale, Daniel A., Draine, B. T., Regan, Michael W., Malhotra, S., Thornley, Michele D., Appleton, P. N., Frayer, D., Helou, G., Stolovy, S., Storrie-Lombardi, L., 2004, ApJS, 154, 222.
• High Spatial Resolution Mid-Infrared Observations of Five Seyfert Galaxies,Soifer, B. T., Neugebauer, G., Matthews, K., Egami, E., Armus, L., 2004, PASP, 116, 493.
• SINGS: The SIRTF Nearby Galaxies Survey, Kennicutt, R. C., Jr., Armus, L., Bendo, G., Calzetti, D., Dale, D. A., Draine, B. T., Engelbracht, C. W., Gordon, K. D., Grauer, A. D., Helou, G., Hollenbach, D. J., Jarrett, T. H., Kewley, L. J., Leitherer, C., Li, A., Malhotra, S., Regan, M. W., Rieke, G. H., Rieke, M. J., Roussel, H., Smith, J.-D. T., Thornley, M. D., Walter, F., 2004, PASP, 115, 928.
• The 2MASS Large Galaxy Atlas, Jarrett, T.H., Chester, T., Cutri, R., Schneider, S.E., Huchra, J.P., 2003, AJ, 125, 525.