J/MNRAS/495/4158 Star formation in barred galaxies (Fraser-McKelvie+, 2020)
SDSS-IV MaNGA: spatially resolved star formation in barred galaxies.
Fraser-McKelvie A., Aragon-Salamanca A., Merrifield M., Masters K.,
Nair P., Emsellem E., Kraljic K., Krishnarao D., Andrews B.H., Drory N.,
Neumann J.
<Mon. Not. R. Astron. Soc., 495, 4158-4169 (2020)>
=2020MNRAS.495.4158F 2020MNRAS.495.4158F (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Morphology ; Optical
Keywords: galaxies: evolution - galaxies: general - galaxies: spiral -
galaxies: star formation
Abstract:
Bars inhabit the majority of local-Universe disc galaxies and may be
important drivers of galaxy evolution through the redistribution of
gas and angular momentum within discs. We investigate the star
formation and gas properties of bars in galaxies spanning a wide range
of masses, environments, and star formation rates using the Mapping
Nearby Galaxies at APO galaxy survey. Using a robustly defined sample
of 684 barred galaxies, we find that fractional (or scaled) bar length
correlates with the host's offset from the star formation main
sequence. Considering the morphology of the Hα emission we
separate barred galaxies into different categories, including barred,
ringed, and central configurations, together with Hα detected at
the ends of a bar. We find that only low-mass galaxies host star
formation along their bars, and that this is located predominantly at
the leading edge of the bar itself. Our results are supported by
recent simulations of massive galaxies, which show that the position
of star formation within a bar is regulated by a combination of shear
forces, turbulence, and gas flows. We conclude that the physical
properties of a bar are mostly governed by the existing stellar mass
of the host galaxy, but that they also play an important role in the
galaxy's ongoing star formation.
Description:
The MaNGA galaxy survey is an integral field spectroscopic survey that
will observe 10000 galaxies (Bundy et al. 2015ApJ...798....7B 2015ApJ...798....7B; Drory
et al. 2015AJ....149...77D 2015AJ....149...77D) by survey completion. It is an SDSS-IV
(Sloan Digital Sky Survey IV) project (Blanton et al.
2017AJ....154...28B 2017AJ....154...28B), employing the 2.5-m telescope at Apache Point
Observatory (Gunn et al. 2006AJ....131.2332G 2006AJ....131.2332G) and BOSS spectrographs
(Smee et al. 2013AJ....146...32S 2013AJ....146...32S). MaNGA's target galaxies were chosen
to include a wide range of galaxy masses and colours, over the
redshift range 0.01<z<0.15.
We select a sample of barred galaxies from the MaNGA survey using
Galaxy Zoo 2 (Willett et al. 2013MNRAS.435.2835W 2013MNRAS.435.2835W, Cat.
J/MNRAS/435/2835). Galaxy Zoo 2 was a citizen science project that
asked participants to classify galaxies according to a flow chart of
questions about a galaxy's morphology. Based on user identifications
(and weighting individual scorers on their accuracy), a probability
that a galaxy contained a particular feature was derived. To account
for user error, we employ weighted fraction values and find through
trial and error that the optimal combination to select barred galaxies
is: p_bar weighted_>0.5 and p_not edgeon_>0.5.
From the starting sample of 6779 galaxies, we find 684 barred galaxies
through this method. While this may seem like a small fraction of the
MaNGA sample, we note that a galaxy must be relatively face-on for a
user to be able to classify whether a bar is present.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea3.dat 71 684 Additional data for all 684 galaxies in the
barred galaxy sample
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See also:
J/AJ/154/86 : MaNGA catalog, DR15 (Wake+, 2017)
Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name PlateIFU MaNGA identifier (NNNNN-NNNNN)
13- 17 F5.2 10+10Msun Mass Stellar mass (1)
19- 22 F4.1 arcsec Re Effective radius (1)
24- 30 A7 --- HaMorph ? Hα morphology (2)
32- 48 A17 --- Notes Additional note
50 A1 --- Armrot Arm rotation (3)
52- 55 F4.1 kpc SBlength ? Stellar bar length
57- 61 F5.1 deg PASB ? Position angle of the stellar bar
63- 65 F3.1 kpc HaBlength ? Hα bar length
67- 71 F5.1 deg PAHaB ? Position angle of the Hα bar
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Note (1): Elliptical Petrosian photometry values from the NASA Sloan Atlas
Note (2): Hα morphology as follows:
0 = No Hα
1 = Hα along the bar
2 = Hα in the centre
3 = Hα at the ends of the bar
4 = Hα in a ring
5 = Hα predominantly outside the bar region in the outer disc
6 = Unclassifiable - unresolved, or does not fit into any of the above
categories (including Hα present, but not associated with the bar
regions of the galaxy)
NB: When a galaxy possessed more than one of these features, both values
were used. For example, a galaxy possessing Hα both at the centre and
ends of the bar would be given the Hα morphology value of 23.
Note (3): Arm rotation as follows:
1 = clockwise
2 = anticlockwise
3 = unsure/S0
- = not in the Hα along bar subsample
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 23-Jun-2023