English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The morphology of galaxies gives essential constraints on the models ofgalaxy evolution. The morphology of the features in the low-surface-brightnessregions of galaxies has not been fully explored yet because of observationaldifficulties. Here we present the results of our visual inspections of verydeep images of a large volume-limited sample of 177 nearby massive early-typegalaxies (ETGs) from the MATLAS survey. The images reach a surface-brightnesslimit of $28.5-29$ mag arcsec$^{-2}$ in the $g'$ band. Using a dedicatednavigation tool and questionnaire, we looked for structures at the outskirts ofthe galaxies such as tidal shells, streams, tails, disturbed outer isophotes orperipheral star-forming disks, and simultaneously noted the presence ofcontaminating sources, such as Galactic cirrus. We also inspected internalsub-structures such as bars and dust lanes. We discuss the reliability of thisvisual classification investigating the variety of answers made by theparticipants. We present the incidence of these structures and the trends ofthe incidence with the mass of the host galaxy and the density of itsenvironment. We find an incidence of shells, stream and tails of approximately15%, about the same for each category. For galaxies with masses over $10^{11}$M$_\odot$, the incidence of shells and streams increases about 1.7 times. Wealso note a strong unexpected anticorrelation of the incidence of Galacticcirrus with the environment density of the target galaxy. Correlations withother properties of the galaxies, and comparisons to model predictions, will bepresented in future papers.

Census and classification of low-surface-brightness structures in nearby early-type galaxies from the MATLAS survey