Monitoring of the optical and 2.5-11.7 mu m spectrum and mid-IR imaging of the Seyfert 1 galaxy Mrk 279 with ISO

Details Monitoring of the optical and 2.5-11.7 mu m spectrum and mid-IR imaging of the Seyfert 1 galaxy Mrk 279 with ISO Monitoring of the optical and 2.5-11.7 mu m spectrum and mid-IR imaging of the Seyfert 1 galaxy Mrk 279 with ISO

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...369...57s&link_type=abstract

Astronomy and Astrophysics, v.369, p.57-64 (2001)

Astronomy and Astrophysics

Astrophysics

19

Galaxies: Active, Galaxies: Individual: Mrk 279, Galaxies: Nuclei, Galaxies: Seyfert, Infrared: Galaxies

Scientific paper

Mid-infrared images of the Seyfert 1 galaxy Mrk 279 obtained with the ISO satellite are presented together with the results of a one-year monitoring campaign of the 2.5-11.7 mu m spectrum. Contemporaneous optical photometric and spectrophotometric observations are also presented. The galaxy appears as a point-like source at the resolution of the ISOCAM instrument (4-5arcsec ). The 2.5-11.7 mu m average spectrum of the nucleus in Mrk 279 shows a strong power law continuum with alpha = -0.80+/-0.05 ({ Fnu ~ nu alpha }) and weak PAH emission features. The Mrk 279 spectral energy distribution shows a mid-IR bump, which extends from 2 to 15-20 mu m . The mid-IR bump is consistent with thermal emission from dust grains at a distance of >~ 100 lt-d. No significant variations of the mid-IR flux have been detected during our observing campaign, consistent with the relatively low amplitude ( ~ 10% rms) of the optical variability during the campaign. The time delay for Hβ line emission in response to the optical continuum variations is tau = 16.7+5.3-5.6 days, consistent with previous measurements. Based on observations collected with the Infrared Space Observatory, ISO, an ESA project with instruments funded by ESA member states (especially the PI countries: France, Germany, The Netherlands, and the UK) with the participation of ISAS and NASA. Tables 4 and 5 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr 130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/369/57

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