Nearby active and starburst galaxies as seen with ISOCAM

We present a set of spectral characteristics distinguishing optically selected active galactic nuclei (AGNs) from starbursts in the mid-IR. In AGN spectra, the Unidentified Infrared Bands (UIBs) are not detected which is probably due to the destruction of their carriers by the UV-X radiation field....

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Publicado: 1999
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004640X_v269-270_n1-4_p357_Laurent
http://hdl.handle.net/20.500.12110/paper_0004640X_v269-270_n1-4_p357_Laurent
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0004640X_v269-270_n1-4_p357_Laurent
record_format dspace
spelling paper:paper_0004640X_v269-270_n1-4_p357_Laurent2023-06-08T14:29:30Z Nearby active and starburst galaxies as seen with ISOCAM We present a set of spectral characteristics distinguishing optically selected active galactic nuclei (AGNs) from starbursts in the mid-IR. In AGN spectra, the Unidentified Infrared Bands (UIBs) are not detected which is probably due to the destruction of their carriers by the UV-X radiation field. In addition, a non-negligible continuum below 10 μm commonly associated with emission from very hot dust is exclusively present in AGNs. On the contrary, starburst spectra present clearly detected UIBs with a faint underlying continuum between 5-10 μm. Based on these features, we build a mid-IR diagnostic diagram to identify emission induced by the AGN and that associated with the star formation activity. This diagnostic based on the mid-IR continuum and the UIB intensity allows us to estimate the relative importance of the three components (HII regions, photo-dissociation regions (PDRs), and AGN) contained in the integrated mid-IR emission of galaxies. Our diagnostic diagram can be applied to reveal the presence of very obscured active nuclei behind large columns of dust. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004640X_v269-270_n1-4_p357_Laurent http://hdl.handle.net/20.500.12110/paper_0004640X_v269-270_n1-4_p357_Laurent
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We present a set of spectral characteristics distinguishing optically selected active galactic nuclei (AGNs) from starbursts in the mid-IR. In AGN spectra, the Unidentified Infrared Bands (UIBs) are not detected which is probably due to the destruction of their carriers by the UV-X radiation field. In addition, a non-negligible continuum below 10 μm commonly associated with emission from very hot dust is exclusively present in AGNs. On the contrary, starburst spectra present clearly detected UIBs with a faint underlying continuum between 5-10 μm. Based on these features, we build a mid-IR diagnostic diagram to identify emission induced by the AGN and that associated with the star formation activity. This diagnostic based on the mid-IR continuum and the UIB intensity allows us to estimate the relative importance of the three components (HII regions, photo-dissociation regions (PDRs), and AGN) contained in the integrated mid-IR emission of galaxies. Our diagnostic diagram can be applied to reveal the presence of very obscured active nuclei behind large columns of dust.
title Nearby active and starburst galaxies as seen with ISOCAM
spellingShingle Nearby active and starburst galaxies as seen with ISOCAM
title_short Nearby active and starburst galaxies as seen with ISOCAM
title_full Nearby active and starburst galaxies as seen with ISOCAM
title_fullStr Nearby active and starburst galaxies as seen with ISOCAM
title_full_unstemmed Nearby active and starburst galaxies as seen with ISOCAM
title_sort nearby active and starburst galaxies as seen with isocam
publishDate 1999
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004640X_v269-270_n1-4_p357_Laurent
http://hdl.handle.net/20.500.12110/paper_0004640X_v269-270_n1-4_p357_Laurent
_version_ 1768543305199517696

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