Infrared spectroscopy and imaging of starburst galaxies and AGNs

Astronomy and Astrophysics – Astronomy

Scientific paper

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Active Galactic Nuclei, Infrared Astronomy, Seyfert Galaxies, Stellar Spectra, Cosmology, Line Spectra, Luminous Intensity, Spectral Resolution, Starburst Galaxies

Scientific paper

High resolution data from infrared spectroscopy and imaging of starburst galaxies and Active Galactic Nuclei (AGN's) are discussed. Observations of starburst galaxies NGC 253, the interacting galaxy NGC 6240 and the Seyfert 2 galaxy NGC 1068 are emphasized. In the starburst galaxy NGC 253, the H2 emission comes from giant, circumnuclear star formation complexes assiciated with dense molecular clouds. In the merger NGC 6240, the H2 emission appears to originate in slow, large scale shocks of the two colliding interstellar media. In the Seyfert 2 galaxy NGC 1068, the H2 emission comes from molecular clouds in the narrow line region that are probably excited by radiation from the nuclear source. The large infrared obscuration of the nucleus of NGC 1068 may be due to intervening molecular clouds in the narrow line region. Strong near infrared (Fe(II)) emission appears to be associated with supernova shocks in starburst galaxies and with the interaction between nuclear outflow and narrow line clouds in NGC 1068. Coronal line emission from highly ionized species like Si(VI) may signify embedded AGN's.

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