J/MNRAS/507/300 Massive Compact Galaxies in MaNGA (Schnorr-Mueller+, 2021)
The puzzling origin of massive compact galaxies in MaNGA.
Schnorr-Mueller A., Trevisan M., Riffel R., Chies-Santos A.L.,
Furlanetto C., Ricci T.V., Lohmann F.S., Flores-Freitas R., Mallmann N.D.,
Alamo-Martinez K.A.
<Mon. Not. R. Astron. Soc. 507, 300-317 (2021)>
=2021MNRAS.507..300S 2021MNRAS.507..300S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Morphology ; Galaxies, rotation ; Redshifts
Keywords: galaxies: evolution - galaxies: stellar content
Abstract:
We characterized the kinematics, morphology, and stellar population
(SP) properties of a sample of massive compact quiescent galaxies
(MCGs, 10≲logM*/M☉≲11 and re∼1-3kpc) in the MaNGA Survey, with
the goal of constraining their formation, assembly history, and
assessing their relation with non-compact quiescent galaxies. We
compared their properties with those of a control sample of
median-sized quiescent galaxies (re∼4-8kpc) with similar effective
velocity dispersions. MCGs have elevated rotational support, as
evidenced by a strong anticorrelation between the Gauss-Hermite moment
h3 and V/σ. In contrast, 30 per cent of control sample galaxies
(CSGs) are slow rotators, and fast-rotating CSGs generally show a weak
h3-V/σ anticorrelation. MCGs and CSGs have similar ages, but
MCGs are more metal-rich and α-enhanced. Both MCGs and CSGs have
shallow negative metallicity gradients and flat [α/Fe]
gradients. On average, MCGs and CSGs have flat age gradients, but CSGs
have a significantly larger dispersion of gradient values. The
kinematics and SP properties of MCGs suggest that they experienced
highly dissipative gas-rich events, such as mergers, followed by an
intense, short, and centrally concentrated burst of star formation,
between 4 and 10Gyr ago (z∼0.4-2), and had a quiet accretion
history since then. This sequence of events might be analogous to,
although less extreme than, the compaction events that formed compact
quiescent galaxies at z∼2. The small sizes of MCGs, and the high
efficiency and short duration of their last star formation episode
suggest that they are descendants of compact post-starburst galaxies.
Description:
Properties of 70 massive compact quiescent galaxies galaxies and 140
control sample galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 202 210 Galaxy properties
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See also:
J/AJ/154/86 : MaNGA catalog, DR15 (Wake+, 2017)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- MaNGA MaNGA ID, 1-NNNNNN
10- 15 A6 --- Sample Sample flag (1)
17- 27 F11.9 --- z SDSS spectroscopic redshift
29- 34 F6.3 [Msun] logM Decimal logarithm of the
galaxy stellar mass (2)
36- 52 F17.13 km/s sigmae Velocity dispersion corrected to an
aperture of radius 1Re
54- 58 F5.2 kpc Re r-band galaxy semi-major axis,
half-light radius (3)
60- 69 F10.8 --- lambda Specific angular momentum
71- 81 E11.8 --- tau Correlation coefficient between
V/σ and the gauss hermite moment h3
83- 99 F17.14 Gyr ageL05re Luminosity weighted stellar ages measured
from a spectra integrated within 0.5Re
101-118 F18.15 Gyr ageL1re Luminosity weighted stellar ages measured
from a spectra integrated
between 0.5-1.0Re
120-139 F20.17 --- metL05re Luminosity weighted stellar metallicity
measured from a spectra integrated
within 0.5Re
141-160 E20.17 --- metL1re Luminosity weighted stellar metallicity
measured from a spectra integrated
between 0.5-1.0Re
162-181 E20.17 --- alpha/fe05re alpha/Fe measured from a spectra
integrated within 0.5Re
183-202 E20.17 --- alpha/fe1re alpha/Fe measured from a spectra
integrated between 0.5-1.0Re
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Note (1): Sample flag as follows:
MCG = Massive Compact galaxy
CSG = sigma_e matched control sample
M*-CSG = logM matched control sample
Note (2): extracted from the GALEX-SDSS-WISE LEGACY CATALOG (GSWLC),
Salim, Boquien & Lee (2018ApJ...859...11S 2018ApJ...859...11S).
Note (3): extracted from a catalog of Bulge+disk decompositions of SDSS
galaxies by Simard et al. (2011ApJS..196...11S 2011ApJS..196...11S, Cat. J/ApJS/196/11).
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Acknowledgements:
Allan Schnorr Mueller, allanschnorr(at)gmail.com
(End) Allan Schnorr Mueller [UFRGS, Brazil], Patricia Vannier [CDS] 27-Sep-2021