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Title: 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
Authors: Santos-Lleo, M.
Clavel, J.
Schulz, B.
Altieri, B.
Barr, P.
Alloin, D.
Berlind, P.
Bertram, R.
Crenshaw, D. M.
Edelson, R. A.
Giveon, U.
Horne, K.
Huchra, J. P.
Kaspi, S.
Kriss, G. A.
Krolik, J. H.
Malkan, M. A.
Malkov, Y. F.
Netzer, H.
O'Brien, P. T.
Peterson, B. M.
Pogge, R. W.
Pronik, V. I.
Qian, B. C.
Reichert, G. A.
Rodriguez-Pascual, P. M.
Sergeev, S. G.
Tao, J.
Tokarz, S.
Wagner, R. M.
Wamsteker, W.
Wilkes, B. J.
First Published: 1-Apr-2001
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2001, 369 (1), pp. 57-64
Abstract: 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 (4-5$\arcsec$). The 2.5-11.7 $\mu$m average spectrum of the nucleus in Mrk 279 shows a strong power law continuum with $\alpha = -0.80\pm0.05$ ( ${ F_{\nu} \propto \nu^{\alpha}}$) 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 $\ga 100$ 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 H$\beta$ line emission in response to the optical continuum variations is $\tau = 16.7^{+5.3}_{-5.6}$ days, consistent with previous measurements.
DOI Link: 10.1051/0004-6361:20010103
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2001 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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