2005A&A...429..825A

C.D.S. - SIMBAD4 rel 1.7 - 2021.02.28CET20:51:59

2005A&A...429..825A - Astronomy and Astrophysics, volume 429, 825-836 (2005/1-3)

The Leo Triplet: Common origin or late encounter?

AFANASIEV V.L. and SIL'CHENKO O.K.

Abstract (from CDS):

The kinematics, structure, and stellar population properties in the centers of two early-type spiral galaxies of the Leo Triplet, NGC 3627 and NGC 3623, are studied by means of integral-field spectroscopy. Unlike our previous targets, NGC 3384/NGC 3368 in the Leo I Group and NGC 5574/NGC 5576 in LGG 379, NGC 3623 and NGC 3627 do not appear to experience a synchronous evolution. The mean ages of their circumnuclear stellar populations are quite different, and the magnesium overabundance of the nucleus in NGC 3627 is evidence for a very brief last star formation event 1 Gyr ago whereas the evolution of the central part of NGC 3623 looks more quiescent. In the center of NGC 3627 we observe noticeable gas radial motions, and the stars and the ionized gas in the center of NGC 3623 demonstrate more or less stable rotation. However, NGC 3623 has a chemically distinct core - a relic of a past star formation burst - which is shaped as a compact, dynamically cold stellar disk with a radius of ∼250-350pc which has been formed not later than 5Gyr ago.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: NGC 3623 - galaxies: individual: NGC 3627 - galaxies: nuclei - galaxies: stellar content - galaxies: kinematics and dynamics - galaxies: evolution

Simbad objects: 12

Full paper

View the reference in ADS

Number of rows : 12

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2021	#notes
1	M 96	GiP	10 46 45.744	+11 49 11.78	10.42	10.15	9.25	8.99		~	752	1
2	M 105	LIN	10 47 49.600	+12 34 53.87		10.56	9.76	9.12	8.18	~	1392	0
3	NAME M96 Group	GrG	10 48	+13.3						~	283	0
4	NGC 3384	GiG	10 48 16.897	+12 37 45.48		10.0				~	558	1
5	* n Leo	SB*	11 15 51.8806231513	+13 18 27.211299575	7.61	6.52	5.32			K2III	149	0
6	M 65	GiP	11 18 55.957	+13 05 31.96		9.6				~	412	1
7	NAME Leo Triplet	IG	11 19	+13.2						~	103	1
8	M 66	GiP	11 20 15.026	+12 59 28.64	9.85	9.65	8.92			~	1188	4
9	NGC 3628	GiP	11 20 17.018	+13 35 22.16		10.42	9.48	9.22		~	764	3
10	LGG 379	CGG	14 20 38.3	+03 40 13						~	8	0
11	NGC 5574	GiP	14 20 55.9683239893	+03 14 16.790076636	13.54	13.23	12.39			~	134	1
12	NGC 5576	GiP	14 21 03.691	+03 16 15.78	12.25	11.85	10.96			~	307	1

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