Query : 2003A&A...412..669H

2003A&A...412..669H - Astronomy and Astrophysics, volume 412, 669-687 (2003/12-4)

NGC5953/54: BVRIHαJK photometry and [NII] Fabry-Perot interferometry. I. The data.


Abstract (from CDS):

We present new BVRIHαJK imaging and [NII] 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, ε=1-b/a, PA and a4/a) profile parameters. Our data are complemented by archived V/R/H images from HST. The Seyfert 2 NGC 5953 shows an underlying featureless disk (≥1.5kpc) in all the observed bands and traces of faint external fan-like features in Hα and [NII]. A compact flocculent spiral pattern (≤1.5kpc), and a ∼60pc 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 [NII] 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.

Abstract Copyright:

Journal keyword(s): galaxies: spiral - galaxies: structure - galaxies: photometry - galaxies: interactions - fundamental parameters - galaxies: kinematics and dynamics

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NGC 5953 GiP 15 34 32.402 +15 11 37.80   13.23 12.45     ~ 359 1
2 APG 91 IG 15 34 33.7 +15 11 49   12.3       ~ 24 1
3 NGC 5954 GiP 15 34 35.175 +15 11 53.67   13.7       ~ 168 0

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