NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-24 T14:20:27 PDT
Help | Comment | NED Home

For refcode 1996A&A...315L.157H:
Retrieve 1 NED object in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1996A&A...315L.157H The mid-infrared color of NGC 6946. Helou G., Malhotra S., 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 31 July 1996/Accepted 20 August 1996 Abstract. We analyze the new mid-infrared maps of NGC 6946 for variations in the color ratio of the 7-to-15 micron emission. Our preliminary findings are that this mid-infrared color is remarkably constant between arms and inter-arm regions, and as a function of radius in the disk, excluding the nuclear region. As surface brightness ranges by more than an order of magnitude and the radius runs from about 0.5 to 3kpc, the color ratio remains constant to about 120%. Our interpretation is that (1) hard UV radiation from OB stars does not dominate the heating of the grains radiating in the mid-infrared; and (2) that surface brightness variations are driven primarily by surface-filling fraction in the disk, and by radiation intensity increases in starburst environments, such as the nucleus of NGC 6946. Keywords: galaxies: individual: NGC 6946 - infrared: galaxies - galaxies: ISM
Retrieve 1 NED object in this reference.
Please click here for ADS abstract

Back to NED Home