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Verfasst von:Morales, Gustavo [VerfasserIn]   i
 Martínez-Delgado, David [VerfasserIn]   i
 Grebel, Eva K. [VerfasserIn]   i
Titel:Systematic search for tidal features around nearby galaxies
Titelzusatz:I. Enhanced SDSS imaging of the local volume
Verf.angabe:Gustavo Morales, David Martínez-Delgado, Eva K. Grebel, Andrew P. Cooper, Behnam Javanmardi, and Arpad Miskolczi
E-Jahr:2018
Jahr:29 June 2018
Umfang:16 S.
Fussnoten:Gesehen am 06.03.2019
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2018
Band/Heft Quelle:614(2018) Artikel-Nummer A143, 16 Seiten
ISSN Quelle:1432-0746
Abstract:Context. In hierarchical models of galaxy formation, stellar tidal streams are expected around most, if not all, galaxies. Although these features may provide useful diagnostics of the Λ CDM model, their observational properties remain poorly constrained because they are challenging to detect and interpret and have been studied in detail for only a sparse sampling of galaxy population. More quantitative, systematic approaches are required. We advocate statistical analysis of the counts and properties of such features in archival wide-field imaging surveys for a direct comparison against results from numerical simulations. Aims. We aim to study systematically the frequency of occurrence and other observational properties of tidal features around nearby galaxies. The sample we construct will act as a foundational dataset for statistical comparison with cosmological models of galaxy formation. Methods. Our approach is based on a visual classification of diffuse features around a volume-limited sample of nearby galaxies, using a post-processing of Sloan Digital Syk Survey (SDSS) imaging optimized for the detection of stellar structure with low surface brightness. Results. At a limiting surface brightness of 28 mag arcsec<sup>−2<sup/>, 14% of the galaxies in our sample exhibit evidence of diffuse features likely to have arisen from minor merging events. Our technique recovers all previously known streams in our sample and yields a number of new candidates. Consistent with previous studies, coherent arc-like features and shells are the most common type of tidal structures found in this study. We conclude that although some detections are ambiguous and could be corroborated or refuted with deeper imaging, our technique provides a reliable foundation for the statistical analysis of diffuse circumgalactic features in wide-area imaging surveys, and for the identification of targets for follow-up studies.
DOI:doi:10.1051/0004-6361/201732271
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: http://dx.doi.org/10.1051/0004-6361/201732271
 DOI: https://doi.org/10.1051/0004-6361/201732271
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1588364216
Verknüpfungen:→ Zeitschrift

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