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Complex central structures suggest complex evolutionary paths for barred S0 galaxies
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DOI：10.1093/mnras/stw1868.png)
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摘要
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We investigate three barred lenticular galaxies (NGC 2681, NGC 3945 and NGC 4371), which were previously reported to have complex central structures but without a detailed structural analysis of these galaxies' high-resolution data. We have therefore performed fourto six-component (pseudo-) bulge/disc/bar/ring/point source) decompositions of the composite (Hubble Space Telescope plus ground-based) surface brightness profiles. We find that NGC 2681 hosts three bars, while NGC 3945 and NGC 4371 are double-and single-barred galaxies, respectively, in agreement with past isophotal analysis. We find that the bulges in these galaxies are compact, and have Sersic indices of n similar to 2.2-3.6 and stellar masses of M-* similar to 0.28 x 10(10)-1.1 x 10(10) M-circle dot. NGC 3945 and NGC 4371 have intermediate-scale 'pseudo-bulges' that are well described by a Sersic model with low n less than or similar to 0.5 instead of an exponential (n = 1) profile as done in the past. We measure emission line fluxes enclosed within nine different elliptical apertures, finding that NGC 2681 has a low-ionization nuclear emission region (LINER)-type emission inside R similar to 3 arcsec, but the emission line due to star formation is significant when aperture size is increased. In contrast, NGC 3945 and NGC 4371 have composite (active galactic nucleus plus star-forming)-and LINER-type emissions inside and outside R similar to 2 arcsec, respectively. Our findings suggest that the three galaxies have experienced a complex evolutionary path. The bulges appear to be consequences of an earlier violent merging event while subsequent disc formation via gas accretion and bar-driven perturbations may account for the build-up of pseudo-bulges, bars, rings and point sources.
Keyword:
galaxies: elliptical and lenticular, cD-galaxies: fundamental parameter
galaxies: individual: NGC 2681, NGC 3945 and NGC 4371
galaxies: nuclei
galaxies: photometry
galaxies: structure
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4.8
论文数:
7.1W
被引数:
25.0W
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