Small-Scale Dynamical Coherence Accompanied with Galaxy Conformity

Abstract

The discovery of the coherence between galaxy rotation and neighbor motion in 1-Mpc scales has been reported recently. Following up the discovery, we investigate whether the neighbors in such dynamical coherence also present galaxy conformity, using the Calar Alto Legacy Integral Field Area Survey (CALIFA) data and the NASA-Sloan Atlas (NSA) catalog. We measure the correlation coefficient of g - r colors between the CALIFA galaxies and their neighbors, as a quantitative indicator of galaxy conformity. The neighbors are divided into coherently moving and anti-coherently moving ones, the correlation coefficients from which are compared with each other, in various bins of relative luminosity and projected distance. In most cases, the CALIFA galaxies and their neighbors show positive correlation coefficients in g - r color, even for the anti-coherent neighbors. However, we find statistically significant (2.6-sigma) difference between coherent and anti-coherent neighbors, when the neighbor galaxies are bright (Delta Mr <= -1.0) and close (D <= 400 kpc). That is, when they are bright and close to the CALIFA galaxies, the coherently moving neighbors show stronger conformity with the CALIFA galaxies than the anti-coherently moving neighbors. This result supports that the small-scale dynamical coherence may originate from galaxy interactions as galaxy conformity is supposed to do, which agrees with the conclusion of the previous study.

arXiv comment8 pages, 5 figures, accepted for publication in The Astrophysical Journal

References in corpus (23)

• The Sloan Digital Sky Survey: Technical Summary
• The 2dF Galaxy Redshift Survey: Spectra and redshifts
• CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation
• The SAURON project - IV. The mass-to-light ratio, the virial mass estimator and the fundamental plane of elliptical and lenticular galaxies
• The 6dF Galaxy Survey: Final Redshift Release (DR3) and Southern Large-Scale Structures
• The Arecibo Legacy Fast ALFA Survey: I. Science Goals, Survey Design and Strategy
• The SAURON project -- IX. A kinematic classification for early-type galaxies
• Properties of Galaxy Groups in the SDSS: I.-- The Dependence of Colour, Star Formation, and Morphology on Halo Mass
• CALIFA, the Calar Alto Legacy Integral Field Area survey: IV. Third Public data release
• CALIFA: a diameter-selected sample for an integral field spectroscopy galaxy survey
• Galaxy spin alignment in filaments and sheets: observational evidence
• Interactions of Galaxies in the Galaxy Cluster Environment
• Transformation of Morphology and Luminosity Classes of the SDSS Galaxies
• Alignment of galaxies relative to their local environment in SDSS-DR8
• The PyCASSO database: Spatially resolved stellar population properties for CALIFA galaxies
• Climbing to the top of the galactic mass ladder: evidence for frequent prolate-like rotation among the most massive galaxies
• Galactic Satellite Systems: Radial Distribution and Environment Dependence of Galaxy Morphology
• Mysterious Coherence in Several-Megaparsec Scales Between Galaxy Rotation and Neighbor Motion
• History and destiny of an emerging early-type galaxy: New IFU insights on the major-merger remnant NGC7252
• The SAMI galaxy survey: Galaxy Interactions and Kinematic Anomalies in Abell 119
• Galaxy Rotation Coherent with the Motions of Neighbors: Discovery of Observational Evidence
• A Study of Environmental Effects on Galaxy Spin Using MaNGA Data
• Discovery of the kinematic alignment of early-type galaxies in the Virgo cluster

Cited by in corpus (3)

• The SAMI Galaxy Survey: Decomposed Stellar Kinematics of Galaxy Bulges and Disks
• Living with Neighbors. III. The Origin of the Spin$-$Orbit Alignment of Galaxy Pairs: A Neighbor versus the Large-scale Structure
• Living with Neighbors. IV. Dissecting the Spin$-$Orbit Alignment of Dark Matter Halos: Interacting Neighbors and the Local Large-scale Structure