The Hercules stream as seen by APOGEE-2 South

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dc.contributor.authorHunt, Jason A. S.
dc.contributor.authorBovy, Jo
dc.contributor.authorPerez-Villegas, Angeles
dc.contributor.authorHoltzman, Jon A.
dc.contributor.authorSobeck, Jennifer
dc.contributor.authorChojnowski, Drew
dc.contributor.authorSantana, Felipe A.
dc.contributor.authorPalicio, Pedro A.
dc.contributor.authorWegg, Christopher
dc.contributor.authorGerhard, Ortwin
dc.contributor.authorAlmeida, Andres
dc.contributor.authorBizyaev, Dmitry
dc.contributor.authorFernandez-Trincado, Jose G.
dc.contributor.authorLane, Richard R.
dc.contributor.authorPelope Longa-Pena, Pen
dc.contributor.authorMajewski, Steven R.
dc.contributor.authorPan, Kaike
dc.contributor.authorRoman-Lopes, Alexandre
dc.date.accessioned2025-01-23T21:23:23Z
dc.date.available2025-01-23T21:23:23Z
dc.date.issued2018
dc.description.abstractThe Hercules stream is a group of comoving stars in the solar neighbourhood, which can potentially be explained as a signature of either the outer Lindblad resonance (OLR) of a fast Galactic bar or the corotation resonance (CR) of a slower bar. In either case, the feature should be present over a large area of the disc. With the recent commissioning of the APOGEE-2 Southern spectrograph we can search for the Hercules stream at (l, b)=(270 degrees, 0), a direction in which the Hercules stream, if caused by the bar's OLR, would be strong enough to be detected using only the line-of-sight velocities. We clearly detect a narrow, Hercules-like feature in the data that can be traced from the solar neighbourhood to a distance of about 4 kpc. The detected feature matches well the line-of-sight velocity distribution from the fast-bar (OLR) model. Confronting the data with a model where the Hercules stream is caused by the CR of a slower bar leads to a poorer match, as the corotation model does not predict clearly separated modes, possibly because the slow-bar model is too hot.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stx2777
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stx2777
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101281
dc.identifier.wosidWOS:000424339500010
dc.issue.numero1
dc.language.isoen
dc.pagina.final101
dc.pagina.inicio95
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectGalaxy: bulge
dc.subjectGalaxy: disc
dc.subjectGalaxy: fundamental parameters
dc.subjectGalaxy: kinematics and dynamics
dc.subjectsolar neighbourhood
dc.subjectGalaxy: structure
dc.titleThe Hercules stream as seen by APOGEE-2 South
dc.typeartículo
dc.volumen474
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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