A New Perspective on the Large-scale Tidal Effect on the Galaxy Luminosity and Morphology

Lee, Jounghun

doi:10.3847/1538-4357/aae376

Cited by 8 publications

(11 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result indicates that although the coherent tides simultaneously obstruct and facilitate the radial and tangential motions of the infall-zone satellites, respectively, the former effect is more dominant. It confirms the speculation of Lee (2018a) that the growths of the host clusters located in the regions with higher tidal coherence would be delayed compared with those in the regions with lower tidal coherence because the radial infalls of their satellites are obstructed by the coherent tides.…”

Section: Numerical Analysissupporting

confidence: 87%

“…In this Letter, we attempt to find a direct numerical evidence for the obstructing effect of the coherent tides on the satellites by examining the directions of the satellite motions relative to their hosts and their links to the degree of the tidal coherence in the regions where the hosts reside. If the observed anti-correlation between the galaxy luminosity and the degree of the tidal coherence is truly caused by the obstructing effect of the coherent tides on the motions of satellites and matter as speculated by Lee (2018a), then those satellites located in the regions with higher tidal coherence must have relatively larger (smaller) fractions of the tangential (radial) velocities. To avoid poor number statistics and contaminations caused by low particle resolution, we will use as our host objects the cluster halos which have much larger number of satellites than the galactic halos.…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

How the Coherent Tides Obstruct the Radial Infalls of Satellite Galaxies onto Clusters

Lee

2019

ApJL

Self Cite

View full text Add to dashboard Cite

A direct numerical evidence for the obstructing effect of the coherent tides on the infall-zone satellites around the cluster halos is presented. Analyzing the numerical data from a high-resolution N-body simulation, we calculate the mean fractions of the radial and tangential velocities of the infall-zone satellites around the cluster halos and investigate if and how they depend on the tidal coherence defined as the alignments between the major principal axes of the local tidal fields smoothed on the linear and nonlinear scales. It is found that the infallzone satellites located in the regions with higher tidal coherence have significantly smaller and larger mean fractions of the radial and tangential velocities, respectively, which indicates that the radial infall of satellites onto host clusters are obstructed by the coherent tides. We also show that those satellites separated by shorter distances from the host clusters, having lower-masses, and embedded in the anisotropic large-scale environments like filaments and sheets, are more vulnerable to the obstructing effect of the coherent tides.Subject headings: cosmology:theory -large-scale structure of universe

show abstract

Section: Numerical Analysissupporting

confidence: 87%

Section: Introductionmentioning

confidence: 98%

How the Coherent Tides Obstruct the Radial Infalls of Satellite Galaxies onto Clusters

Lee

2019

ApJL

Self Cite

View full text Add to dashboard Cite

show abstract

“…Some other works (Luparello et al 2015;Scudder et al 2012;Pandey & Bharadwaj 2006Darvish et al 2014;Filho et al 2015) report significant dependence of the luminosity, star formation rate and metallicity of galaxies on the large-scale environment. A recent study by Lee (2018) show that both the least and most luminous elliptical galaxies in sheetlike structures inhabit the regions with highest tidal coherence. A number of studies (Trujillo et al 2006;Lee & Erdogdu 2007;Paz et al 2008;Jones et al 2010;Tempel & Libeskind 2013; suggest alignment of halo shapes and spins with filaments which can extend upto 40 Mpc (Chen, et al 2019).…”

Section: Introductionmentioning

confidence: 96%

A study on the statistical significance of mutual information between morphology of a galaxy and its large-scale environment

Sarkar,

Pandey

2020

Preprint

View full text Add to dashboard Cite

A non-zero mutual information between morphology of a galaxy and its large-scale environment is known to exist in SDSS upto a few tens of Mpc. It is important to test the statistical significance of these mutual information if any. We propose three different methods to test the statistical significance of these non-zero mutual information and apply them to SDSS and Millennium Run simulation. We randomize the morphological information of SDSS galaxies without affecting their spatial distribution and compare the mutual information in the original and randomized datasets. We also divide the galaxy distribution into smaller subcubes and randomly shuffle them many times keeping the morphological information of galaxies intact. We compare the mutual information in the original SDSS data and its shuffled realizations for different shuffling lengths. Using a t-test, we find that a statistically significant (at 99.9% confidence level) mutual information between morphology and environment exists upto the entire length scale probed. We also conduct another experiment using mock datasets from a semi-analytic galaxy catalogue where we assign morphology to galaxies in a controlled manner based on the density at their locations. The experiment clearly demonstrate that mutual information can effectively capture the physical correlations between morphology and environment. Our analysis suggests that physical association between morphology and environment may extend to much larger length scales than currently believed and mutual information can be used as an useful statistical measure for the study of large-scale environmental dependence of galaxy properties.

show abstract

“…Yan, Fan & White (2013) analyze the SDSS data to find that the tidal environment of large scale structures do not influence the galaxy properties. Recently, Lee (2018) show that the elliptical galaxies in the sheetlike environment dwell in the regions with the highest tidal coherence. Pandey & Sarkar (2017) analyze the Galaxy Zoo (Lintott et al 2008) data using information theoretic measures to find that morphology and environment exhibit a synergic interaction upto a length scales of ∼ 30 h −1 Mpc.…”

Section: Introductionmentioning

confidence: 99%

Exploring galaxy colour in different environments of the cosmic web with SDSS

Pandey,

Sarkar

2020

Preprint

View full text Add to dashboard Cite

We analyze a set of volume limited samples from the SDSS to study the dependence of galaxy colour on different environments of the cosmic web. We measure the local dimension of the galaxies to determine their embedding environments and find that the filaments host a higher fraction of red galaxies than the sheets at each luminosity. At a fixed luminosity, the fraction of red galaxies in filaments and sheets increases with the size of these structures. This suggests that the bigger structures have a larger baryon reservoir favouring higher accretion rate and larger stellar mass. At a fixed length scale, the fraction of red galaxies monotonically increases in all the environments with increasing luminosity. We also find that the average colour of the red and blue populations are systematically higher in the environments with smaller local dimension and increases monotonically in all the environments with luminosity. We observe that the bimodal nature of the galaxy colour distribution persists in all environments and all luminosities suggesting that the transformation from blue to red galaxy can occur in all environments.

show abstract

A New Perspective on the Large-scale Tidal Effect on the Galaxy Luminosity and Morphology

Cited by 8 publications

References 79 publications

How the Coherent Tides Obstruct the Radial Infalls of Satellite Galaxies onto Clusters

How the Coherent Tides Obstruct the Radial Infalls of Satellite Galaxies onto Clusters

A study on the statistical significance of mutual information between morphology of a galaxy and its large-scale environment

Exploring galaxy colour in different environments of the cosmic web with SDSS

Contact Info

Product

Resources

About