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Table of Contents

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

Basic Information

• Common name: NGC 6946

• Other names: APG 29, IRAS 20338+5959

• Position: RA= 20h30m52.336s Dec=+60d09m14.21s (J2000)

• Type: spiral galaxy, Scd

• Redshift: z=0.0002 (Brinkmann et al., 1995A&AS, 109, 147)

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

DSS R band (Search the DSS)

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

Spitzer 3.6 micron imaging with IRAC (Retrieve this image using Leopard, AOR ID 5508864)

Spitzer 4.5 micron imaging with IRAC (Retrieve this image using Leopard, AOR ID 5508864)

Spitzer 5.8 micron imaging with IRAC (Retrieve this image using Leopard, AOR ID 5508864)

ISO-CAM 6.7 microns (Search the ISO archive)

Spitzer 8.0 micron imaging with IRAC (Retrieve this image using Leopard, AOR ID 5508864)

5 degree IRAS 12 micron image centered on NGC6946 ( Retrieve IRAS images using OASIS)

ISO-CAM 14.3 microns (Search the ISO archive)

Spitzer 24 micron imaging with MIPS (Retrieve this image using Leopard, AOR ID 5576704)

Spitzer 70 micron imaging with MIPS (Retrieve this image using Leopard, AOR ID 5576704)

5 degree IRAS 100 micron image centered on NGC6946 ( Retrieve IRAS images using OASIS)

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

Infrared Spectra

click image for full 2 to 12 micron spectra with ISO-PHT (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 the SINGS Legacy Project as well as a GTO program. (Program ID numbers 97, 159, and 193)
  (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.
• Molecular gas in normal late-type galaxies, Boselli, A., Lequeux, J., Gavazzi, G., 2002, A&AS, 384, 33.
• ISO LWS Observations of the Two Nearby Spiral Galaxies NGC 6946 and NGC 1313, Contursi, A., Kaufman, M. J., Helou, G., Hollenbach, D. J., Brauher, J., Stacey, G. J., Dale, D. A., Malhotra, S., Rubio, M., Rubin, R. H., Lord, S. D., 2002, AJ, 124, 751.
• The relation of PAH strength with cold dust in galaxies, Haas, M., Klaas, U., Bianchi, S., 2002, A&A, 385,23.
• Toward an Understanding of the Mid-Infrared Surface Brightness of Normal Galaxies, Dale, D. A., Helou, G., Silbermann, N. A., Contursi, A., Malhotra, S., Rubin, R. H., 1999, AJ, 118, 2055.