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Date and Time of the Query: 2019-06-26 T17:22:40 PDT
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For refcode 1996A&A...315L.161M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1996A&A...315L.161M ISOCAM observations of NGC 6946: Mid-IR structure. Malhotra S., Helou G., Van Buren D., Kong M., Beichman C.A., Dinerstein H., Hollenbach D.J., Hunter D.A., Lo K.Y., Lord S.D., Lu N.Y., Rubin R.H., Stacey G.J., Thronson H.A.Jr, Werner M.W. Infrared Processing and Analysis Center, JPL, California Institute of Technology, MS 100/22, Pasadena, CA 91125, USA University of Texas, Astronomy Department, RLM 15.308 Texas, Austin, TX 78712, USA NASA/Ames Research Center, MS 245-6, Moffett Field, CA 94035, USA Lowell Observatory, 1400 Mars Hill Rd., Flagstaff, AZ 86001, USA University of Illinois, Astronomy Dept. Bldg. 103, 1002 W. Green St., Urbana, IL 61801, USA Cornell University, Astronomy Department, 220 Space Sciences Building, Ithaca, NY 14853 USA University of Wyoming, Wyoming Infrared Observatory, Laramie, WY, 82071 USA Jet Propulsion Laboratory, 4800 Oak Grove Drive., Pasadena, CA 91109, USA Received 7 August 1996/Accepted 20 August 1996 Abstract. The nearby spiral galaxy NGC 6946 was observed with ISO-CAM in the mid-infrared, achieving 7" resolution and sub-MJy sr^-1^ sensitivity. Images taken with CAM filters LW2 (7micron) and LW3 (15micron) are analysed to determine the morphology of this galaxy and understand better the emission mechanisms. The mid-infrared emission follows an exponential disk with a scale length 75". This is 60% of the scale length in the optical R-band and radio continuum. The nuclear starburst region is too bright for reliable measurement in these images. Its surface brightness exceeds the inner disk by at least a factor of 12. The arms and interarm regions are clearly detected, with each of these components contributing about equally to the disk emission. The arm-interarm contrast is 2-4 in the mid-IR, close to that measured in the visible R band light and lower than the contrast in H{alpha}, suggesting that non-ionizing radiation contributes significantly to dust heating. Keywords: infrared: galaxies - infrared: ISM: continuum - galaxies: ISM - galaxies: spiral - galaxies: structure
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