Muestra métricas de impacto externas asociadas a la publicación. Para mayor detalle:
| Indexado |
|
||||
| DOI | 10.3847/1538-3881/AB8D35 | ||||
| Año | 2020 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
The radial velocities of 2768 fundamental-mode RR Lyrae stars (RRLs) toward the southern Galactic bulge are presented, spanning the southern bulge from -8 degrees < l b < -6 degrees. Distances derived from the pulsation properties of the RRLs are combined with Gaia proper motions to give constraints on the orbital motions of 1389 RRLs. The majority (similar to 75%) of the bulge RRLs have orbits consistent with these stars being permanently bound to <3.5 kpc from the Galactic Center, similar to the bar. However, unlike the bulge giants, the RRLs exhibit slower rotation and a higher velocity dispersion. The higher velocity dispersion arises almost exclusively from halo interlopers passing through the inner Galaxy. We present 82 stars with space velocities greater than or similar to 500 km s(-1) and find that the majority of these high-velocity stars are halo interlopers; it is unclear if a subsample of these stars with similar space velocities has a common origin. Once the 25% of the sample represented by halo interlopers is cleaned, we can clearly discern two populations of bulge RRLs in the inner Galaxy. The first population of RRLs is not as tightly bound to the Galaxy (but is still confined to the inner similar to 3.5 kpc) and is both spatially and kinematically consistent with the barred bulge. The second population is more centrally concentrated and does not trace the bar. One possible interpretation is that this population was born prior to bar formation, as their spatial location, kinematics, and pulsation properties suggest, possibly from an accretion event at high redshift.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Kunder, Andrea | Mujer |
St Martins Univ - Estados Unidos
Saint Martin's University - Estados Unidos |
| 2 | Prez-Villegas, A. | - |
UNIV SAO PAULO - Brasil
Universidade de Sao Paulo - USP - Brasil Universidade de São Paulo - Brasil |
| 3 | Rich, R. Michael | Hombre |
UNIV CALIF LOS ANGELES - Estados Unidos
University of California, Los Angeles - Estados Unidos |
| 4 | Ogata, Jonathan | Hombre |
St Martins Univ - Estados Unidos
Saint Martin's University - Estados Unidos |
| 5 | Murari, Emma | Mujer |
St Martins Univ - Estados Unidos
Saint Martin's University - Estados Unidos |
| 6 | Boren, Emilie | Mujer |
St Martins Univ - Estados Unidos
Saint Martin's University - Estados Unidos |
| 7 | Johnson, Christian I. | Hombre |
Harvard Smithsonian Ctr Astrophys - Estados Unidos
Harvard-Smithsonian Center for Astrophysics - Estados Unidos |
| 8 | Nataf, David M. | Hombre |
Johns Hopkins Univ - Estados Unidos
Johns Hopkins University Krieger School of Arts and Sciences - Estados Unidos |
| 9 | WALKER, ALISTAIR | Hombre |
Observatorio Interamericano del Cerro Tololo - Chile
Cerro Tololo Inter American Observatory - Chile NOIRLab - Estados Unidos |
| 10 | Bono, G. | Hombre |
Univ Roma Tor Vergata - Italia
Istituto Nazionale di Astrofisica - Italia Università degli Studi di Roma Tor Vergata - Italia Osservatorio Astronomico di Roma - Italia Università degli Studi di Roma "Tor Vergata" - Italia INAF - Italia |
| 11 | Koch, A. | Hombre |
Heidelberg Univ - Alemania
Astronomisches Rechen-Institut Heidelberg - Alemania Astronomisches Rechen-Institut - Alemania |
| 12 | DE PROPRIS, ROBERTO ANGEL | Hombre |
Univ Turku - Finlandia
Turun yliopisto - Finlandia |
| 13 | Storm, Jesper | Hombre |
Leibniz Inst Astrophys AIP - Alemania
Leibniz Institute for Astrophysics Potsdam - Alemania |
| 14 | Wojno, Jennifer | Mujer |
Johns Hopkins Univ - Estados Unidos
Johns Hopkins University Krieger School of Arts and Sciences - Estados Unidos |
| Fuente |
|---|
| FAPESP |
| Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) |
| DGAPA-PAPIIT |
| M. J. Mudrock Charitable Trust |
| Agradecimiento |
|---|
| A.M.K. thanks Victor Debattista for helpful comments during the writing of this manuscript. We thank the anonymous referee for suggestions that helped the clarity and quality of the paper. We thank the Australian Astronomical Observatory, which have made these observations possible. The grant support provided, in part, by the M. J. Mudrock Charitable Trust (NS-2017321) is acknowledged. A.K. gratefully acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)-Project-ID 138713538-SFB 881 ("The Milky Way System," subproject A11. A.P.V. acknowledges FAPESP for the postdoctoral fellowship No. 2017/15893-1 and the DGAPA-PAPIIT grant IG100319. |