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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448212.0, MPI für Astronomie / Publikationen_mpia
Discovery of a giant stellar tidal stream around the disk galaxy NGC 4013
Authors:Martínez-Delgado, David; Pohlen, Michael; Gabany, R. Jay; Majewski, Steven R.; Peñarrubia, Jorge; Palma, Chris
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Start Page:955
End Page:963
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We report the discovery of a giant, looplike stellar structure around the edge-on spiral galaxy NGC 4013. This arcing feature extends 6' (~26 kpc in projected distance) northeast from the center and 3' (sime12 kpc) from the disk plane; likely related features are also apparent on the southwest side of the disk, extending to 4' (~17 kpc). The detection of this low surface brightness (muR = 27.0+0.3 --0.2 mag arcsec--2) structure is independently confirmed in three separate datasets from three different telescopes. Although its true three-dimensional geometry is unknown, the sky-projected morphology of this structure displays a match with the theoretical predictions for the edge-on, projected view of a stellar tidal stream of a dwarf satellite moving in a low inclined (sime25°), nearly circular orbit. Using the recent model of the Monoceros tidal stream in the Milky Way by Peñarrubia and colleagues as a template, we find that the progenitor system may have been a galaxy with an initial mass 6 × 108 M sun, whose current position and final fate are unknown. According to this simulation, the tidal stream may be approximately ~2.8 Gyr of age. Our results demonstrate that NGC 4013, previously considered a prototypical isolated disk galaxy in spite of having one of the most prominent H I warps detected thus far, may have in fact suffered a recent minor merger. This discovery highlights that undisturbed disks at high surface brightness levels in the optical but warped in H I maps may in fact reveal complex signatures of recent accretion events in deep photometric surveys.
Free Keywords:galaxies: dwarf; galaxies: evolution; galaxies: halos; galaxies: individual: NGC 4013; galaxies: interactions
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009ApJ...692..955M [ID No:1]
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