Cartography of Triangulum-Andromeda using SDSS stars. Issue 2 (30th August 2017)

• Record Type: Journal Article
• Authors: Perottoni, H. D.; Rocha-Pinto, H. J.; Girardi, L.; Balbinot, E.; Santiago, B. X.; Majewski, S. R.; Anders, F.; Da Costa, L.; Maia, M. A. G.
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 473:Issue 2(2018)
• Page Start: 1461
• Page End: 1471
• Publication Date: 2017-08-30
• Subjects: Galaxy: halo -- Galaxy: stellar content -- Galaxy: structure; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stx2217
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: The outer Galactic halo is home to a number of substructures which still have an uncertain origin, but most likely are remnants of former interactions between the Galaxy and its former satellites. Triangulum-Andromeda (TriAnd) is one of these halo substructures, found as an overdensity of Two Micron All Sky Survey (2MASS) M giants. We analysed the region of TriAnd using photometric data from the Ninth Data Release of Sloan Digital Sky Survey. By comparing the observations with simulations from the trilegal Galactic model, we were able to identify and map several scattered overdensities of main-sequence stars that seem to be associated with TriAnd over a large area covering ∼500 deg 2 . One of these excesses may represent a new stellar overdensity. We also briefly discuss an alternative hypothesis, according to which TriAnd is one of the troughs of oscillation rings in the Galactic disc.