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Title:
Near-infrared continuum and 3.3 micrometer(s) polycyclic aromatic hydrocarbon imaging of the starburst ring in the type 1 Seyfert galaxy NGC 7469
Authors:
Mazzarella, J. M.; Voit, G. M.; Soifer, B. T.; Matthews, K.; Graham, J. R.; Armus, L.; Shupe, D.
Affiliation:
AA(Jet Propulsion Laboratory, Pasadena, CA, US), AB(Jet Propulsion Laboratory, Pasadena, CA, US), AC(California Inst. of Tech., Pasadena, CA, US), AD(California Inst. of Tech., Pasadena, CA, US), AE(Univ. of California, Berkeley, CA, US), AF(Univ. of California, Berkeley, CA, US), AG(Palomar Observatory, Pasadena, CA, US)
Publication:
The Astronomical Journal, vol. 107, no. 4, p.1274-1282 (AJ Homepage)
Publication Date:
04/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
DATA REDUCTION, INTERPLANETARY DUST, MOLECULAR GASES, QUASARS, SEYFERT GALAXIES, STAR FORMATION, STARBURST GALAXIES, EMISSION SPECTRA, INFRARED ASTRONOMY, INFRARED ASTRONOMY SATELLITE, LUMINOSITY, NEAR INFRARED RADIATION
DOI:
10.1086/116939
Bibliographic Code:
1994AJ....107.1274M

Abstract

High resolution near-infrared images of the type 1 Seyfert galaxy NGC 7469 have been obtained to probe its dusty nuclear environment. Direct J, H, and K images are relatively featureless, but residual images created by subtracting a smooth model based on best-fitting elliptical isophotes reveal a tight inner spiral whose high surface-brightness portions correspond to a previously detected 3 sec (1 kpc) diameter ring of radio continuum emission. The inner infrared spiral arms extended approximately equal to 4 sec NW and SE from the nucleus, and the NW arm joins up with large-scale spiral structure visible in the R band. The residual images also show a bar-like structure aligned with the brightest infrared/radio hotspots at PA approximately equal to 50 deg. Three infrared hotspots are detected which align remarkably well with 6 cm radio continuum sources. The near-infrared ring and the hotspots are visible in the residual images, and in a high-resolution direct K-band image restored to an effective resolution of 0.65 sec (FWHM) using the Richardson-Lucy algorithm. The infrared hotspots have luminosities of nuLnu (2.2 micrometer(s)) approximately equal to 108 solar luminosity (Mk approximately equal to -16 mag), suggesting they are either giant H II regions or individual supernovae. The two brightest regions may be associated with enhanced star formation triggered by orbit crowding of gas where spiral arms emerge from an inner bar. Narrowband (delta lambda/lambda approximately 1.5%) imaging in the 3.28 micrometer(s) dust emission feature and surrounding continuum confirms the 3 sec diameter 3.28 micrometer(s) emission region detected previously using multiaperture photometry. The extended polycyclic aromatic hydrocarbon (PAH) emission is slightly elongated and aligned with published 1O III1 line emission and 12.5 micrometer(s) continuum emission, apparently tracing the starburst. The presence of approximately equal to 25% of the total 3.28 micrometer(s) PAH emission within R less than 1 sec demonstrates that a starburst within the central few hundred parsecs must supply a significant fraction of the infrared continuum from the nucleus, and there is apparently sufficient shielding material between the starburst and the active galactic nucleus (AGN) to preserve the PAHs along our line of sight to the nucleus.

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