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J/A+A/604/A4        CALIFA galaxies observational hints       (Ruiz-Lara+, 2017)

Observational hints of radial migration in disc galaxies from CALIFA. Ruiz-Lara T., Perez I., Florido E., Sanchez-Blazquez P., Mendez-Abreu J., Sanchez-Menguiano L., Sanchez S.F., Lyubenova M., Falcon-Barroso J., van de Ven G., Marino R.A., de Lorenzo-Caceres A., Catalan-Torrecilla C., Costantin L., Bland-Hawthorn J., Galbany L., Garcia-Benito R., Husemann B., Kehrig C., Marquez I., Mast D., Walcher C.J., Zibetti S., Ziegle B., CALIFA team <Astron. Astrophys. 604, A4 (2017)> =2017A&A...604A...4R (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Galaxies, photometry ; Galaxy catalogs ; Morphology Keywords: galaxies: stellar content - galaxies: spiral - galaxies: evolution - galaxies: formation - galaxies: structure Abstract: According to numerical simulations, stars are not always kept at their birth galactocentric distances but migrate. The importance of this radial migration in shaping galactic light distributions is still unclear. However, if it is indeed important, galaxies with different surface brightness (SB) profiles must display differences in their stellar population properties. We investigate the role of radial migration on the light distribution and the radial stellar content by comparing the inner colour, age and metallicity gradients for galaxies with different SB profiles. We define these inner parts avoiding the bulge and bar regions and up to around three disc scale lengths (type I, pure exponential) or the break radius (type II, downbending; type III, upbending). We analyse 214 spiral galaxies from the CALIFA survey covering different SB profiles. We make use of GASP2D and SDSS data to characterise their light distribution and obtain colour profiles. The stellar age and metallicity profiles are computed using a methodology based on full-spectrum fitting techniques (pPXF, GANDALF, and STECKMAP) to the IFS CALIFA data. The distributions of the colour, stellar age and stellar metallicity gradients in the inner parts for galaxies displaying different SB profiles are unalike as suggested by Kolmogorov-Smirnov and Anderson-Darling tests. We find a trend in which type II galaxies show the steepest profiles of all and type III the shallowest, with type I galaxies displaying an intermediate behaviour. These results are consistent with a scenario in which radial migration is more efficient for type III galaxies than for type I systems with type II galaxies presenting the lowest radial migration efficiency. In such scenario, radial migration mixes the stellar content flattening the radial stellar properties and shaping different SB profiles. However, in sight of these results we cannot further quantify its importance in shaping spiral galaxies, and other processes such as recent star formation or satellite accretion might play a role. Description: Characterisation of the sample of galaxies under analysis in the paper. The sample comprises 214 galaxies from the CALIFA survey. For each galaxy the name, equatorial coordinates, morphological type, presence of a bar, surface brightness profile type, inner disc scale length (kpc), outer disc scale length (kpc), and break radius in units of the inner disc scale length are given. Columns (1), (2), (3), and (4) from the CALIFA general sample characterisation (Walcher et al., 2014A&A...569A...1W). Columns (5), (6), (7), (8), (9), and (10) from the 2D decomposition performed in Mendez-Abreu et al. (2017, Cat. J/A+A/598/A32). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 51 214 Galaxy characterisation and surface brightness
See also: J/A+A/598/A32 : 2D decomposition of CALIFA galaxies (Mendez-Abreu+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Name Galaxy name 16- 21 F6.2 deg RAdeg Right ascension (J2000.0) (1) 23- 28 F6.2 deg DEdeg Declination (J2000.0) (1) 30 I1 --- MType Morphological type (1) 32 I1 --- Bar [0/1] Bar presence (1 --> yes) (2) 34 I1 --- SB [1/3] Surface brightness profile (I, II, III) (2) 36- 40 F5.2 kpc hin Inner disc scale length (2) 42- 46 F5.2 kpc hout ? Outer disc scale length (2) 48- 51 F4.2 --- Rbr/hin ? Ratio between break radius and hin (2)
Note (1): From Walcher C.J. et al., 2014A&A...569A...1W, CALIFA: a diameter-selected sample for an integral field spectroscopy galaxy survey. Note (2): From Mendez-Abreu et al., 2017A&A...598A..32M, Cat. J/A+A/598/A32 Two-dimensional multi-component photometric decomposition of CALIFA galaxies. 1 = Type I (pure exponential) profile 2 = Type II (down-bending) profile 3 = Type III (up-bending) profile
Acknowledgements: Tomas Ruiz-Lara, tomasruizlara(at)
(End) Tomas Ruiz-Lara [IAC, Spain], Patricia Vannier [CDS] 15-May-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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