The fundamental plane of early-type galaxies in different environments

Samir, R.M.; Reda, Fatma M.; Shaker, A. A.; Osman, Anas; Amin, Mohamed

doi:10.1016/j.nrjag.2016.06.004

“…The local environment of NGC 7135 is described by Samir et al (2016) as being 'low density', with the classification of 'low density' (Annibali et al 2010) a result of the richness parameter ρ xyz = 0.32 gal Mpc −3 (Tully & Fisher 1988). Early-type galaxies in low density environments are known to possess on average younger populations (∼ 2 Gyr younger) than similar galaxies in higher density environments (Thomas, Maraston & Bender 2003), a likely result of more recent mergers and star formation.…”

Section: Introductionmentioning

confidence: 99%

Old and new major mergers in the SOSIMPLE galaxy, NGC 7135

Davison

¹

,

Küntschner

²

,

Norris

³

et al. 2021

Monthly Notices of the Royal Astronomical Society

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The simultaneous advancement of high resolution integral field unit spectroscopy and robust full-spectral fitting codes now make it possible to examine spatially-resolved kinematic, chemical composition, and star-formation history from nearby galaxies. We take new MUSE data from the Snapshot Optical Spectroscopic Imaging of Mergers and Pairs for Legacy Exploration (SOSIMPLE) survey to examine NGC 7135. With counter-rotation of gas, disrupted kinematics and asymmetric chemical distribution, NGC 7135 is consistent with an ongoing merger. Though well hidden by the current merger, we are able to distinguish stars originating from an older merger, occurring 6-10 Gyr ago. We further find a gradient in ex-situ material with galactocentric radius, with the accreted fraction rising from 0% in the galaxy centre, to ∼7% within 0.6 effective radii.

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“…BCGs properties may also be affected by their cluster halos mass at low redshift. BCGs Fundamental Plane (FP) in general follow the same FP of normal clusters Samir et al (2011), but BCGs FP and scaling relations are not the same as those of isolated galaxies and the FP is a waveband dependent Samir et al (2020).…”

Section: Introductionmentioning

confidence: 99%

“…Understanding BCGs nature needs to study well environmental effects which affect on their physical properties (e.g. Shaker et al 1998;Samir et al 2011Samir et al , 2016.…”

Section: Introductionmentioning

confidence: 99%

Possible Relations between Brightest Central Galaxies and Their Host Galaxies Clusters and Groups

Samir

¹

,

Shaker

²

2021

Applied Mathematics and Nonlinear Sciences

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The r-band of the Sloan Digital Sky Survey (SDSS) for 17,924 brightest cluster galaxies (BCGs) in clusters and groups within 0.02 ⩽ z ⩽ 0.20 are used to study possible environmental relations affecting the nature of these galaxies. We find a correlation between BCGs physical properties (the effective radius (Re ), absolute magnitude and central velocity dispersion (σ 0)) and their host groups and clusters velocity dispersion (σcl ). This type of relations suggests that the most massive groups or clusters host larger central galaxies. On the other hand, the σ 0/σcl ratio as a function of σcl is consistent with [10].

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“…The local environment of NGC 7135 is described by Samir et al (2016) as being 'low density', with the classification of 'low density' (Annibali et al 2010) a result of the richness parameter 𝜌 𝑥 𝑦𝑧 =0.32 gal Mpc −3 (Tully & Fisher 1988). Early type galaxies in low density environments are known to possess on average younger populations (∼ 2Gyr younger) than similar galaxies in higher density environments (Thomas et al 2003), a likely result of more recent mergers and star formation.…”

Section: Introductionmentioning

confidence: 99%

Old and New Major Mergers in the SOSIMPLE galaxy, NGC 7135

Davison,

Kuntschner,

Husemann

et al. 2021

Preprint

0

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The simultaneous advancement of high resolution integral field unit spectroscopy and robust full-spectral fitting codes now make it possible to examine spatially-resolved kinematic, chemical composition, and star-formation history from nearby galaxies. We take new MUSE data from the Snapshot Optical Spectroscopic Imaging of Mergers and Pairs for Legacy Exploration (SOSIMPLE) survey to examine NGC 7135. With counter-rotation of gas, disrupted kinematics and asymmetric chemical distribution, NGC 7135 is consistent with an ongoing merger. Though well hidden by the current merger, we are able to distinguish stars originating from an older merger, occurring 6-10 Gyr ago. We further find a gradient in ex-situ material with galactocentric radius, with the accreted fraction rising from 0% in the galaxy centre, to ∼7% within 0.6 effective radii.

show abstract

The fundamental plane of early-type galaxies in different environments

Cited by 12 publications

References 84 publications

Old and new major mergers in the SOSIMPLE galaxy, NGC 7135

Old and new major mergers in the SOSIMPLE galaxy, NGC 7135

Possible Relations between Brightest Central Galaxies and Their Host Galaxies Clusters and Groups

Old and New Major Mergers in the SOSIMPLE galaxy, NGC 7135

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