| Issue |
A&A
Volume 412, Number 3, December IV 2003
|
|
|---|---|---|
| Page(s) | 669 - 687 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361:20031445 | |
| Published online | 08 December 2003 | |
NGC 5953/54: BVRIHαJK photometry and [N II] Fabry-Perot interferometry*,**
I. The data
Instituto de Astronomía – UNAM – Apartado Postal 70-264, 04510 México D.F., México e-mail: [margarit;irene;iqui;alfred;deborah]@astroscu.unam.mx
Corresponding author: H. M. Hernández-Toledo, hector@astroscu.unam.mx
Received:
14
April
2003
Accepted:
15
September
2003
We present new BVRIHαJK imaging and [N II] scanning
Fabry-Perot observations for the interacting galaxy pair NGC 5953/54. Morphology
is reviewed using a combination of contrast-enhanced images, color-index
maps, and geometric (radial μ, 
, PA and 
)
profile parameters. Our data are complemented by archived V/R/H images from
HST. The Seyfert 2 NGC 5953 shows an underlying featureless disk
(≥1.5 kpc) in all the observed bands and traces of faint external
fan-like features in Hα and [N II]. A compact flocculent spiral
pattern (≤1.5 kpc), and a ~60 pc bar-like central structure
are also observed. The Liner galaxy NGC 5954 is an inclined
and distorted spiral with a strong circumnuclear starburst region and
star-forming regions throughout the disk. A tidal bridge or distorted arm
appears to link the two galaxies, extending to the northwest as a linear
feature (plume). NGC 5954 also shows blue filaments delineating
bubble-like features on the north side of the nucleus where our Fabry-Perot
observations reveal double emission line profiles. We derive BVRIJK magnitudes
and surface brightness profiles for the galaxies. HST V/R and H-band
surface brightness profiles are also presented for NGC 5953. Fabry-Perot
observations yield an [N II] velocity field and rotation curves for the
components. The observations coupled with results from a simulation atlas
of tidal features allow us 1) to suggest a tentative geometry of the
encounter in NGC 5953/54, and 2) to comment about a suspected secular
transformation in NGC 5953/54 via the interaction process. A
forthcoming paper is devoted to a more detailed analysis of our
observations including HI synthesis observations and n-body numerical
simulations.
Key words: galaxies: spiral / galaxies: structure / galaxies: photometry / galaxies: interactions / galaxies: fundamental parameters / galaxies: kinematics and dynamics
© ESO, 2003
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