J/A+A/618/A34 Barlenses in the CALIFA survey (Laurikainen+, 2018)
Barlenses in the CALIFA survey:
Combining photometric and stellar population analyses.
Laurikainen E., Salo H., Laine J., Janz J.
<Astron. Astrophys., 618, A34 (2018)>
=2018A&A...618A..34L 2018A&A...618A..34L (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Morphology
Keywords: galaxies: bulges - galaxies: evolution - galaxies: structure -
galaxies: spiral - galaxies: stellar content
Abstract:
It is theoretically predicted that, at low galaxy inclinations,
boxy/peanut bar components have a barlens appearance of a round
central component embedded in the narrow bar. We investigate barlenses
in the Calar Alto Legacy Integral Field Area (CALIFA) survey galaxies,
studying their morphologies, stellar populations, and metallicities.
We show that, when present, barlenses account for a significant
portion of light of photometric bulges, i.e., the excess light on top
of the disks, which highlights the importance of bars in accumulating
central galaxy mass concentrations in the cosmic timescale.
We made multi-component decompositions for a sample of 46 barlens
galaxies drawn from the CALIFA survey, where
M*/M☉=109.7-1011.4 and z=0.005-0.03. Unsharp masks of
the Sloan Digital Sky Survey (SDSS) r'-band mosaics were used to
identify the boxy/peanut or X-shaped features. Barlenses are
identified in the images using our simulation snapshots as an
additional guide. Our decompositions with GALFIT include bulges,
disks, and bars as well as barlenses as a separate component. For 26
of the decomposed galaxies the CALIFA DR2 V500 grating data cubes were
used to explore stellar ages and metallicities at the regions of
various structure components.
We find that 25±2% of the 1064 galaxies in the whole CALIFA sample
show either X-shaped or barlens features. In the decomposed galaxies
with barlenses, on average 13%±2% of the total galaxy light belongs
to this component, leaving less than 10% for possible separate bulge
components. Most importantly, bars and barlenses are found to have
similar cumulative stellar age and metallicity distributions. The
metallicities in barlenses are on average near solar, but exhibit a
large range. In some of the galaxies barlenses and X-shaped features
appear simultaneously, in which case the bar origin of the barlens is
unambiguous.
This is the first time that a combined morphological and stellar
population analysis is used to study barlenses. We show that their
stars are accumulated in a prolonged time period concurrently with the
evolution of the narrow bar.
Description:
The CALIFA survey of 1064 galaxies was used to identify vertically
thick inner bar components that are X shaped in edge-on view and have
a barlens morphology in less inclined galaxies. A subsample of 46
barlens galaxies was successfully decomposed to different structure
components using the r'-band mosaic images of SDSS-DR12. A subsample
of 26 galaxies was further analyzed using the publicly available
CALIFA IFU data cubes with V500 grating.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 70 134 Barlens (bl) identifications in the CALIFA
survey
tablec1.dat 63 127 Galaxies with X-shaped bars in the CALIFA survey,
identified from the unsharp mask images.
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See also:
J/A+A/573/A59 : Gas kinematics in CALIFA survey (Garcia-Lorenzo+, 2015)
J/A+A/576/A135 : CALIFA DR2 (Garcia-Benito+, 2015)
J/A+A/581/A103 : CALIFA survey across the Hubble sequence (Gonzalez+, 2015)
J/A+A/584/A87 : CALIFA sample SFR calibration (Catalan-Torrecilla+, 2015)
J/A+A/585/A47 : CALIFA color/metallicity gradients connections
(Marino+, 2016)
J/A+A/587/A70 : CALIFA face-on spiral galaxies oxygen
(Sanchez-Menguiano+, 2016)
J/A+A/593/A114 : CALIFA space density distribution of galaxies
(Bekeraite+, 2016)
J/A+A/594/A36 : CALIFA Survey DR3 list of galaxies (Sanchez+, 2016)
J/A+A/595/A62 : CALIFA galaxies O/H and N/O slopes (Perez-Montero+, 2016)
J/ApJ/826/71 : Growth curves of CALIFA spiral galaxies
(Iglesias-Paramo+, 2016)
J/MNRAS/462/2715 : Oxygen abundance maps of CALIFA galaxies (Zinchenko+, 2016)
J/A+A/597/A48 : Stellar kinematics in CALIFA survey (Falcon-Barroso+, 2017)
J/A+A/598/A32 : 2D decomposition of CALIFA galaxies (Mendez-Abreu+, 2017)
J/A+A/604/A4 : CALIFA galaxies observational hints (Ruiz-Lara+, 2017)
J/ApJ/846/159 : Interferometric CO obs. of 126 CALIFA galaxies
(Bolatto+, 2017)
J/ApJ/848/87 : CALIFA SFRs. II. Bulges, bars + disks
(Catalan-Torrecilla+, 2017)
Byte-by-byte Description of file: tableb1.dat tablec1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Sample Sample (1)
14 A1 --- --- [:]
16- 29 A14 --- Galaxy Galaxy name, as given in the CALIFA database
31- 36 F6.4 --- z Redshift, as given in the CALIFA database
38- 43 F6.2 mag rMAG Absolute r magnitude, as given in the CALIFA
database (2)
45- 50 F6.3 [Msun] logM Stellar mass, as given in the CALIFA
database (3)
52- 56 A5 --- KSD KSD flag (4)
58- 70 A13 --- Com Comment (5)
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Note (1): Sample as follows:
bl (mother) = CALIFA "mother" sample
bl (extended) = CALIFA "extended" sample
bl+X = galaxies in which barlenses and X-shaped features appear
at the same time
Note (2): The magnitudes are based on Petrosian aperture magnitudes, except for
a few cases in which they are based on curve-of-growth magnitudes.
Note (3): Calculation of the stellar masses was explained by Walcher et al.
(2008A&A...491..713W 2008A&A...491..713W).
Note (4): KSD flag as follows:
K = CALIFA V1200 grating kinematics is available
S = V500 grating stellar population SSP data cube is available
D = galaxies previously decomposed by Mendez-abreu et al.
(2017, Cat. J/A+A/598/A32)
Note (5): In comments uncertain bl-identifications are indicated as follows:
nbar = nuclear bar
nr = nuclear ring
X/bl = X-shaped feature
uncertain = uncertain bl-identification
boxy = boxy rather than X-shaped bar morphology appeared
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Dec-2018