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 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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 51 214 Galaxy characterisation and surface brightness
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See also:
J/A+A/598/A32 : 2D decomposition of CALIFA galaxies (Mendez-Abreu+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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)
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Note (1): From Walcher C.J. et al., 2014A&A...569A...1W 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 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
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Acknowledgements:
Tomas Ruiz-Lara, tomasruizlara(at)gmail.com
(End) Tomas Ruiz-Lara [IAC, Spain], Patricia Vannier [CDS] 15-May-2017