SIMBAD references

2017MNRAS.469.2539K - Mon. Not. R. Astron. Soc., 469, 2539-2594 (2017/August-2)

Towards a new classification of galaxies: principal component analysis of CALIFA circular velocity curves.

KALINOVA V., COLOMBO D., ROSOLOWSKY E., KANNAN R., GALBANY L., GARCIA-BENITO R., GONZALEZ DELGADO R., SANCHEZ S.F., RUIZ-LARA T., MENDEZ-ABREU J., CATALAN-TORRECILLA C., SANCHEZ-MENGUIANO L., DE LORENZO-CACERES A., COSTANTIN L., FLORIDO E., KODAIRA K., MARINO R.A., LASKER R. and BLAND-HAWTHORN J.

Abstract (from CDS):

We present a galaxy classification system for 238 (E1-Sdm) CALIFA (Calar Alto Legacy Integral Field Area) galaxies based on the shapes and amplitudes of their circular velocity curves (CVCs). We infer the CVCs from the de-projected surface brightness of the galaxies, after scaling by a constant mass-to-light ratio based on stellar dynamics - solving axisymmetric Jeans equations via fitting the second velocity moment Vrms=sqrt(V2+σ2) of the stellar kinematics. We use principal component analysis (PCA) applied to the CVC shapes to find characteristic features and use a k-means classifier to separate circular curves into classes. This objective classification method identifies four different classes, which we name slow-rising (SR), flat (FL), round-peaked (RP) and sharp-peaked (SP) circular curves. SR are typical for low-mass, late-type (Sb-Sdm), young, faint, metal-poor and disc-dominated galaxies. SP are typical for high-mass, early-type (E1-E7), old, bright, metal-rich and bulge-dominated galaxies. FL and RP appear presented by galaxies with intermediate mass, age, luminosity, metallicity, bulge-to-disc ratio and morphologies (E4-S0a, Sa-Sbc). The discrepancy mass factor, fd = 1 - M*/Mdyn, have the largest value for SR and SP classes (∼ 74 per cent and ∼ 71 per cent, respectively) in contrast to the FL and RP classes (with ∼ 59 per cent and ∼ 61 per cent, respectively). Circular curve classification presents an alternative to typical morphological classification and appears more tightly linked to galaxy evolution.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: data analysis - methods: statistical - galaxies: evolution - galaxies: kinematics and dynamics - galaxies: structure - galaxies: structure

VizieR on-line data: <Available at CDS (J/MNRAS/469/2539): tableb.dat tablec1.dat tabled.dat>

Status at CDS:   Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 238

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2017MNRAS.469.2539K and select 'bookmark this link' or equivalent in the popup menu


2020.07.03-13:18:05

© Université de Strasbourg/CNRS

    • Contact