DISCOVERY of RR LYRAE STARS in the NUCLEAR BULGE of the MILKY WAY

Dante Minniti, Rodrigo Contreras Ramos, Manuela Zoccali, Marina Rejkuba, Oscar A. Gonzalez, Elena Valenti, Felipe Gran

Resultado de la investigación: Article

7 Citas (Scopus)

Resumen

Galactic nuclei, such as that of the Milky Way, are extreme regions with high stellar densities, and in most cases, the hosts of a supermassive black hole. One of the scenarios proposed for the formation of the Galactic nucleus is merging of primordial globular clusters. An implication of this model is that this region should host stars that are characteristically found in old Milky Way globular clusters. RR Lyrae stars are primary distance indicators, well known representatives of old and metal-poor stellar populations, and therefore are regularly found in globular clusters. Here we report the discovery of a dozen RR Lyrae type ab stars in the vicinity of the Galactic center, i.e., in the so-called nuclear stellar bulge of the Milky Way. This discovery provides the first direct observational evidence that the Galactic nuclear stellar bulge contains ancient stars (>10 Gyr old). Based on this we conclude that merging globular clusters likely contributed to the build-up of the high stellar density in the nuclear stellar bulge of the Milky Way.

Idioma originalEnglish
Número de artículoL14
PublicaciónAstrophysical Journal Letters
Volumen830
N.º1
DOI
EstadoPublished - 10 oct 2016

Huella dactilar

globular clusters
galactic nuclei
stars
metal
metals
indicator

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Minniti, D., Ramos, R. C., Zoccali, M., Rejkuba, M., Gonzalez, O. A., Valenti, E., & Gran, F. (2016). DISCOVERY of RR LYRAE STARS in the NUCLEAR BULGE of the MILKY WAY. Astrophysical Journal Letters, 830(1), [L14]. https://doi.org/10.3847/2041-8205/830/1/L14
Minniti, Dante ; Ramos, Rodrigo Contreras ; Zoccali, Manuela ; Rejkuba, Marina ; Gonzalez, Oscar A. ; Valenti, Elena ; Gran, Felipe. / DISCOVERY of RR LYRAE STARS in the NUCLEAR BULGE of the MILKY WAY. En: Astrophysical Journal Letters. 2016 ; Vol. 830, N.º 1.
@article{f01950ddc1fe49ed96f64812990e6e7f,
title = "DISCOVERY of RR LYRAE STARS in the NUCLEAR BULGE of the MILKY WAY",
abstract = "Galactic nuclei, such as that of the Milky Way, are extreme regions with high stellar densities, and in most cases, the hosts of a supermassive black hole. One of the scenarios proposed for the formation of the Galactic nucleus is merging of primordial globular clusters. An implication of this model is that this region should host stars that are characteristically found in old Milky Way globular clusters. RR Lyrae stars are primary distance indicators, well known representatives of old and metal-poor stellar populations, and therefore are regularly found in globular clusters. Here we report the discovery of a dozen RR Lyrae type ab stars in the vicinity of the Galactic center, i.e., in the so-called nuclear stellar bulge of the Milky Way. This discovery provides the first direct observational evidence that the Galactic nuclear stellar bulge contains ancient stars (>10 Gyr old). Based on this we conclude that merging globular clusters likely contributed to the build-up of the high stellar density in the nuclear stellar bulge of the Milky Way.",
keywords = "catalogs, editorials, notices, miscellaneous, surveys",
author = "Dante Minniti and Ramos, {Rodrigo Contreras} and Manuela Zoccali and Marina Rejkuba and Gonzalez, {Oscar A.} and Elena Valenti and Felipe Gran",
year = "2016",
month = "10",
day = "10",
doi = "10.3847/2041-8205/830/1/L14",
language = "English",
volume = "830",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "1",

}

Minniti, D, Ramos, RC, Zoccali, M, Rejkuba, M, Gonzalez, OA, Valenti, E & Gran, F 2016, 'DISCOVERY of RR LYRAE STARS in the NUCLEAR BULGE of the MILKY WAY', Astrophysical Journal Letters, vol. 830, n.º 1, L14. https://doi.org/10.3847/2041-8205/830/1/L14

DISCOVERY of RR LYRAE STARS in the NUCLEAR BULGE of the MILKY WAY. / Minniti, Dante; Ramos, Rodrigo Contreras; Zoccali, Manuela; Rejkuba, Marina; Gonzalez, Oscar A.; Valenti, Elena; Gran, Felipe.

En: Astrophysical Journal Letters, Vol. 830, N.º 1, L14, 10.10.2016.

Resultado de la investigación: Article

TY - JOUR

T1 - DISCOVERY of RR LYRAE STARS in the NUCLEAR BULGE of the MILKY WAY

AU - Minniti, Dante

AU - Ramos, Rodrigo Contreras

AU - Zoccali, Manuela

AU - Rejkuba, Marina

AU - Gonzalez, Oscar A.

AU - Valenti, Elena

AU - Gran, Felipe

PY - 2016/10/10

Y1 - 2016/10/10

N2 - Galactic nuclei, such as that of the Milky Way, are extreme regions with high stellar densities, and in most cases, the hosts of a supermassive black hole. One of the scenarios proposed for the formation of the Galactic nucleus is merging of primordial globular clusters. An implication of this model is that this region should host stars that are characteristically found in old Milky Way globular clusters. RR Lyrae stars are primary distance indicators, well known representatives of old and metal-poor stellar populations, and therefore are regularly found in globular clusters. Here we report the discovery of a dozen RR Lyrae type ab stars in the vicinity of the Galactic center, i.e., in the so-called nuclear stellar bulge of the Milky Way. This discovery provides the first direct observational evidence that the Galactic nuclear stellar bulge contains ancient stars (>10 Gyr old). Based on this we conclude that merging globular clusters likely contributed to the build-up of the high stellar density in the nuclear stellar bulge of the Milky Way.

AB - Galactic nuclei, such as that of the Milky Way, are extreme regions with high stellar densities, and in most cases, the hosts of a supermassive black hole. One of the scenarios proposed for the formation of the Galactic nucleus is merging of primordial globular clusters. An implication of this model is that this region should host stars that are characteristically found in old Milky Way globular clusters. RR Lyrae stars are primary distance indicators, well known representatives of old and metal-poor stellar populations, and therefore are regularly found in globular clusters. Here we report the discovery of a dozen RR Lyrae type ab stars in the vicinity of the Galactic center, i.e., in the so-called nuclear stellar bulge of the Milky Way. This discovery provides the first direct observational evidence that the Galactic nuclear stellar bulge contains ancient stars (>10 Gyr old). Based on this we conclude that merging globular clusters likely contributed to the build-up of the high stellar density in the nuclear stellar bulge of the Milky Way.

KW - catalogs

KW - editorials, notices

KW - miscellaneous

KW - surveys

UR - http://www.scopus.com/inward/record.url?scp=84991578301&partnerID=8YFLogxK

U2 - 10.3847/2041-8205/830/1/L14

DO - 10.3847/2041-8205/830/1/L14

M3 - Article

AN - SCOPUS:84991578301

VL - 830

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 1

M1 - L14

ER -