ISOCAM observations of NGC 6946: Mid-IR structure

S. Malhotra, G. Helou, D. Van Buren, M. Kong, C. A. Beichman, H. Dinerstein, D. J. Hollenbach, D. A. Hunter, K. Y. Lo, S. D. Lord, N. Y. Lu, R. H. Rubin, G. J. Stacey, H. A. Thronson, M. W. Werner

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The nearby spiral galaxy NGC 6946 was observed with ISO-CAM in the mid-infrared, achieving 7z″resolution and sub-MJy sr-1 sensitivity. Images taken with CAM filters LW2 (7/μm) and LW3 (15μm) 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 15″. 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 α, suggesting that non-ionizing radiation contributes significantly to dust heating.

Original languageEnglish (US)
JournalAstronomy and Astrophysics
Volume315
Issue number2
StatePublished - Nov 10 1996
Externally publishedYes

Fingerprint

computer aided manufacturing
spiral galaxies
brightness
dust
radio
galaxies
continuums
filter
heating
filters
sensitivity
radiation
non-ionising radiation

Keywords

  • Galaxies: ISM
  • Galaxies: spiral
  • Galaxies: structure
  • Infrared: galaxies
  • Infrared: ISM: continuum

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Malhotra, S., Helou, G., Van Buren, D., Kong, M., Beichman, C. A., Dinerstein, H., ... Werner, M. W. (1996). ISOCAM observations of NGC 6946: Mid-IR structure. Astronomy and Astrophysics, 315(2).

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.; Werner, M. W.

In: Astronomy and Astrophysics, Vol. 315, No. 2, 10.11.1996.

Research output: Contribution to journalArticle

Malhotra, S, Helou, G, Van Buren, D, Kong, M, Beichman, CA, Dinerstein, H, Hollenbach, DJ, Hunter, DA, Lo, KY, Lord, SD, Lu, NY, Rubin, RH, Stacey, GJ, Thronson, HA & Werner, MW 1996, 'ISOCAM observations of NGC 6946: Mid-IR structure', Astronomy and Astrophysics, vol. 315, no. 2.
Malhotra S, Helou G, Van Buren D, Kong M, Beichman CA, Dinerstein H et al. ISOCAM observations of NGC 6946: Mid-IR structure. Astronomy and Astrophysics. 1996 Nov 10;315(2).
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. ; Werner, M. W. / ISOCAM observations of NGC 6946 : Mid-IR structure. In: Astronomy and Astrophysics. 1996 ; Vol. 315, No. 2.
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abstract = "The nearby spiral galaxy NGC 6946 was observed with ISO-CAM in the mid-infrared, achieving 7z″resolution and sub-MJy sr-1 sensitivity. Images taken with CAM filters LW2 (7/μm) and LW3 (15μm) 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 15″. 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 α, suggesting that non-ionizing radiation contributes significantly to dust heating.",
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AU - Beichman, C. A.

AU - Dinerstein, H.

AU - Hollenbach, D. J.

AU - Hunter, D. A.

AU - Lo, K. Y.

AU - Lord, S. D.

AU - Lu, N. Y.

AU - Rubin, R. H.

AU - Stacey, G. J.

AU - Thronson, H. A.

AU - Werner, M. W.

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N2 - The nearby spiral galaxy NGC 6946 was observed with ISO-CAM in the mid-infrared, achieving 7z″resolution and sub-MJy sr-1 sensitivity. Images taken with CAM filters LW2 (7/μm) and LW3 (15μm) 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 15″. 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 α, suggesting that non-ionizing radiation contributes significantly to dust heating.

AB - The nearby spiral galaxy NGC 6946 was observed with ISO-CAM in the mid-infrared, achieving 7z″resolution and sub-MJy sr-1 sensitivity. Images taken with CAM filters LW2 (7/μm) and LW3 (15μm) 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 15″. 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 α, suggesting that non-ionizing radiation contributes significantly to dust heating.

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KW - Galaxies: structure

KW - Infrared: galaxies

KW - Infrared: ISM: continuum

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