The role of environment in the evolution of dwarf irregular galaxies: a comparison of<i>UBVR</i>and Hα photometry

Dunn, Jacqueline

doi:10.1093/mnras/stv1629

Cited by 3 publications

(1 citation statement)

References 44 publications

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“…The possible effects of the environment on the structural properties as well as on the formation scenarios have been studied during the last decades. Comparison of the scaling relations for dwarfs in clusters and in the LG support a picture where the dwarfs are shaped more by internal than external processes (Weisz et al 2011;Young et al 2014;Dunn 2015). Some formation scenarios, such as the transformation of late type galaxies to dEs via harassment, have been put forward to explain the morphology-density relation of dwarf galaxies (Ferguson & Sandage 1991).…”

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confidence: 78%

Structure and morphology of the MATLAS dwarf galaxies and their central nuclei

Poulain,

Marleau,

Habas

et al. 2021

Preprint

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We present a photometric study of the dwarf galaxy population in the low to moderate density environments of the MATLAS deep imaging survey. The sample consists of 2210 dwarfs, including 508 nucleated. We define a nucleus as a compact source that is close to the galaxy photocenter (within 0.5 𝑅 𝑒 ) which is also the brightest such source within the galaxy's effective radius. The morphological analysis is performed using a two-dimensional surface brightness profile modeling on the g-band images of both the galaxies and nuclei. Our study reveals that, for similar luminosities, the MATLAS dwarfs show ranges in the distribution of structural properties comparable to cluster (Virgo and Fornax) dwarfs and a range of sizes comparable to the Local Group and Local Volume dwarfs. Color measurements using the r-and i-band images indicate that the dwarfs in low and moderate density environments are as red as cluster dwarfs on average. The observed similarities between dwarf ellipticals in vastly different environments imply that dEs are not uniquely the product of morphological transformation due to rampressure stripping and galaxy harassment in high density environments. We measure that the dwarf nuclei are located predominantly in massive, bright and round dwarfs and observe fewer nuclei in dwarfs with a faint center and a small size. The color of the galaxy nucleus shows no clear relation to the color of the dwarf, in agreement with the migration and wet migration nucleus formation scenarios. The catalogs of the MATLAS dwarfs photometric and structural properties are provided.

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confidence: 78%

Structure and morphology of the MATLAS dwarf galaxies and their central nuclei

Poulain,

Marleau,

Habas

et al. 2021

Preprint

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Structure and morphology of the MATLAS dwarf galaxies and their central nuclei

Poulain

Marleau

Habas

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We present a photometric study of the dwarf galaxy population in the low to moderate density environments of the MATLAS deep imaging survey. The sample consists of 2210 dwarfs, including 508 nucleated. We define a nucleus as a compact source that is close to the galaxy photocenter (within 0.5 Re) which is also the brightest such source within the galaxy’s effective radius. The morphological analysis is performed using a two-dimensional surface brightness profile modeling on the g-band images of both the galaxies and nuclei. Our study reveals that, for similar luminosities, the MATLAS dwarfs show ranges in the distribution of structural properties comparable to cluster (Virgo and Fornax) dwarfs and a range of sizes comparable to the Local Group and Local Volume dwarfs. Color measurements using the r- and i-band images indicate that the dwarfs in low and moderate density environments are as red as cluster dwarfs on average. The observed similarities between dwarf ellipticals in vastly different environments imply that dEs are not uniquely the product of morphological transformation due to ram-pressure stripping and galaxy harassment in high density environments. We measure that the dwarf nuclei are located predominantly in massive, bright and round dwarfs and observe fewer nuclei in dwarfs with a faint center and a small size. The colour of the galaxy nucleus shows no clear relation to the colour of the dwarf, in agreement with the migration and wet migration nucleus formation scenarios. The catalogs of the MATLAS dwarfs photometric and structural properties are provided.

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SDSS-IV MaNGA: The MaNGA Dwarf Galaxy Sample Presentation

Cano-Díaz¹,

Hernández-Toledo²,

Rodríguez-Puebla³

et al. 2022

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We present the MaNGA Dwarf galaxy (MaNDala) Value Added Catalog (VAC), from the final release of the Sloan Digital Sky Survey-IV program. MaNDala consists of 136 randomly selected bright dwarf galaxies with M * < 109.1 M ⊙ and M g > −18.5, making it the largest integral field spectroscopy homogeneous sample of dwarf galaxies. We release a photometric analysis of the g, r, and z broadband imaging based on the DESI Legacy Imaging Surveys, as well as a spectroscopic analysis based on the Pipe3D SDSS-IV VAC. Our release includes the surface brightness (SB), geometric parameters, and color profiles, Sérsic fits as well as stellar population properties (such as stellar ages, metallicities, and star formation histories), and emission lines' fluxes within the FOV and the effective radii of the galaxies. We find that the majority of the MaNDala galaxies are star-forming late-type galaxies with 〈n Sersic,r〉 ∼ 1.6 that are centrals (central/satellite dichotomy). MaNDala covers a large range of SB values (we find 11 candidate ultra-diffuse galaxies and three compact ones), filling the gap between classical dwarfs and low-mass galaxies in the Kormendy Diagram and in the size–mass/luminosity relation, which seems to flatten at 108 < M */M ⊙ < 109 with 〈R e,r 〉 ∼ 2.7 kpc. A large fraction of MaNDala galaxies formed from an early low-metallicity burst of SF, but also from late SF events from more metal-enriched gas: half of the MaNDala galaxies assembled 50% of their mass at 〈z〉 > 2, while the last 20% was at 〈z〉 < 0.3. Finally, a bending of the sSFR-M * relation at M * ∼ 109 M ⊙ for the main-sequence galaxies seems to be supported by MaNDala.

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The role of environment in the evolution of dwarf irregular galaxies: a comparison ofUBVRand Hα photometry

Cited by 3 publications

References 44 publications

Structure and morphology of the MATLAS dwarf galaxies and their central nuclei

Structure and morphology of the MATLAS dwarf galaxies and their central nuclei

Structure and morphology of the MATLAS dwarf galaxies and their central nuclei

SDSS-IV MaNGA: The MaNGA Dwarf Galaxy Sample Presentation

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