Near-infrared photometry of isolated spirals with and without an AGN
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1999-11Metadata
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Márquez, I.
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Near-infrared photometry of isolated spirals with and without an AGN
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Abstract
We present infrared imaging data in the J and
K0 bands obtained for 18 active spiral galaxies, together
with 11 non active galaxies taken as a control sample. All
of them were chosen to satisfy well de ned isolation criteria
so that the observed properties are not related to gravitational
interaction. For each object we give: the image in
the K0 band, the sharp-divided image (obtained by dividing
the observed image by a ltered one), the di erence
image (obtained by subtracting a model to the observed
one), the color J − K0 image, the ellipticity and position
angle pro les, the surface brightness pro les in J and K0,
their ts by bulge+disk models and the color gradient.
We have found that four (one) active (control) galaxies
previously classi ed as non-barred turn out to have
bars when observed in the near-infrared. One of these four
galaxies (UGC 1395) also harbours a secondary bar. For
15 (9 active, 6 control) out of 24 (14 active, 10 control) of
the optically classi ed barred galaxies (SB or SX) we nd
that a secondary bar (or a disk, a lense or an elongated
ring) is present.
The work presented here is part of a large program
(DEGAS) aimed at nding out whether there are di er-ences between active and non active galaxies in the properties
of their central regions that could be connected with
the onset of nuclear activity.
General note
Artículo de publicación ISI
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Financed by DGICyT grants
PB93-0139 and PR95-329. We acknowledge nancial support
from INSU-CNRS for several observing trips. Financial support
to develop the present investigation has been obtained
by the French-Spanish HF1996-0104 and HF1998-0052 and
the Chilean-Spanish bilateral agreement CSIC-CONICYT
99CL0018.
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Astron. Astrophys. Suppl. Ser. 140, 1{14 (1999)
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