Discovery of new Milky Way star cluster candidates in the 2 MASS point source catalog. V. Follow-up observations of the young stellar cluster candidates RCW 87, [BDSB2003] 164 and [DBSB2003] 172

J. Borissova, V. D. Ivanov, D. Minniti, D. Geisler

Resultado de la investigación: Article

19 Citas (Scopus)

Resumen

Context. Massive clusters are more often found in actively star forming galaxies than in quiescent ones, similar to the Milky Way. Aims. We have carried out an extensive survey of obscured Milky Way clusters to determine whether our Galaxy is still forming such objects. Methods. Near-infrared spectral classification of some probable cluster members was used to derive the distances to the cluster candidates. Isochrone analysis of deep near-infrared color-magnitude diagrams allowed us to obtain age and mass estimates. Results. We report the physical parameters of three cluster candidates: RCW 87 is ∼25 Myr old, located at a distance of D ∼ 7.6 kpc in the general direction of the Galactic center. Adding the mass of the suspected cluster members we obtain an estimated total cluster mass of ∼ 10 300 M. The mid-infrared photometry indicates that some next-generation star formation is on-going in the associated H II region, probably triggered by supernovae or stellar wind from the older stars in RCW 87. The brightest member of [BDSB2003] 164 is an O5 V type star, based on our spectroscopy. This limits the cluster age to less than a few million years. The estimated total mass is ∼ 1760 M ̇ and the distance is D ∼ 3.2 kpc. [DBSB2003] 172 lacks central concentration and most likely this is not a cluster but an extended star forming region. Conclusions. The high mass of RCW 87 - if confirmed - puts this object in line with Arches and Quintuplet, among the most young massive clusters in the Galaxy. Further study is necessary to confirm this important result.

Idioma originalEnglish
Páginas (desde-hasta)923-930
Número de páginas8
PublicaciónAstronomy and Astrophysics
Volumen455
N.º3
DOI
EstadoPublished - sep 2006

Huella dactilar

star clusters
point sources
catalogs
point source
near infrared
stars
galaxies
arch
diagram
spectroscopy
young
infrared photometry
arches
color-magnitude diagram
stellar winds
H II regions
supernovae
star formation

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Citar esto

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title = "Discovery of new Milky Way star cluster candidates in the 2 MASS point source catalog. V. Follow-up observations of the young stellar cluster candidates RCW 87, [BDSB2003] 164 and [DBSB2003] 172",
abstract = "Context. Massive clusters are more often found in actively star forming galaxies than in quiescent ones, similar to the Milky Way. Aims. We have carried out an extensive survey of obscured Milky Way clusters to determine whether our Galaxy is still forming such objects. Methods. Near-infrared spectral classification of some probable cluster members was used to derive the distances to the cluster candidates. Isochrone analysis of deep near-infrared color-magnitude diagrams allowed us to obtain age and mass estimates. Results. We report the physical parameters of three cluster candidates: RCW 87 is ∼25 Myr old, located at a distance of D ∼ 7.6 kpc in the general direction of the Galactic center. Adding the mass of the suspected cluster members we obtain an estimated total cluster mass of ∼ 10 300 M⊙. The mid-infrared photometry indicates that some next-generation star formation is on-going in the associated H II region, probably triggered by supernovae or stellar wind from the older stars in RCW 87. The brightest member of [BDSB2003] 164 is an O5 V type star, based on our spectroscopy. This limits the cluster age to less than a few million years. The estimated total mass is ∼ 1760 M ̇ and the distance is D ∼ 3.2 kpc. [DBSB2003] 172 lacks central concentration and most likely this is not a cluster but an extended star forming region. Conclusions. The high mass of RCW 87 - if confirmed - puts this object in line with Arches and Quintuplet, among the most young massive clusters in the Galaxy. Further study is necessary to confirm this important result.",
keywords = "Galaxy: open clusters and associations: general, Infrared: general",
author = "J. Borissova and Ivanov, {V. D.} and D. Minniti and D. Geisler",
year = "2006",
month = "9",
doi = "10.1051/0004-6361:20054724",
language = "English",
volume = "455",
pages = "923--930",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
number = "3",

}

TY - JOUR

T1 - Discovery of new Milky Way star cluster candidates in the 2 MASS point source catalog. V. Follow-up observations of the young stellar cluster candidates RCW 87, [BDSB2003] 164 and [DBSB2003] 172

AU - Borissova, J.

AU - Ivanov, V. D.

AU - Minniti, D.

AU - Geisler, D.

PY - 2006/9

Y1 - 2006/9

N2 - Context. Massive clusters are more often found in actively star forming galaxies than in quiescent ones, similar to the Milky Way. Aims. We have carried out an extensive survey of obscured Milky Way clusters to determine whether our Galaxy is still forming such objects. Methods. Near-infrared spectral classification of some probable cluster members was used to derive the distances to the cluster candidates. Isochrone analysis of deep near-infrared color-magnitude diagrams allowed us to obtain age and mass estimates. Results. We report the physical parameters of three cluster candidates: RCW 87 is ∼25 Myr old, located at a distance of D ∼ 7.6 kpc in the general direction of the Galactic center. Adding the mass of the suspected cluster members we obtain an estimated total cluster mass of ∼ 10 300 M⊙. The mid-infrared photometry indicates that some next-generation star formation is on-going in the associated H II region, probably triggered by supernovae or stellar wind from the older stars in RCW 87. The brightest member of [BDSB2003] 164 is an O5 V type star, based on our spectroscopy. This limits the cluster age to less than a few million years. The estimated total mass is ∼ 1760 M ̇ and the distance is D ∼ 3.2 kpc. [DBSB2003] 172 lacks central concentration and most likely this is not a cluster but an extended star forming region. Conclusions. The high mass of RCW 87 - if confirmed - puts this object in line with Arches and Quintuplet, among the most young massive clusters in the Galaxy. Further study is necessary to confirm this important result.

AB - Context. Massive clusters are more often found in actively star forming galaxies than in quiescent ones, similar to the Milky Way. Aims. We have carried out an extensive survey of obscured Milky Way clusters to determine whether our Galaxy is still forming such objects. Methods. Near-infrared spectral classification of some probable cluster members was used to derive the distances to the cluster candidates. Isochrone analysis of deep near-infrared color-magnitude diagrams allowed us to obtain age and mass estimates. Results. We report the physical parameters of three cluster candidates: RCW 87 is ∼25 Myr old, located at a distance of D ∼ 7.6 kpc in the general direction of the Galactic center. Adding the mass of the suspected cluster members we obtain an estimated total cluster mass of ∼ 10 300 M⊙. The mid-infrared photometry indicates that some next-generation star formation is on-going in the associated H II region, probably triggered by supernovae or stellar wind from the older stars in RCW 87. The brightest member of [BDSB2003] 164 is an O5 V type star, based on our spectroscopy. This limits the cluster age to less than a few million years. The estimated total mass is ∼ 1760 M ̇ and the distance is D ∼ 3.2 kpc. [DBSB2003] 172 lacks central concentration and most likely this is not a cluster but an extended star forming region. Conclusions. The high mass of RCW 87 - if confirmed - puts this object in line with Arches and Quintuplet, among the most young massive clusters in the Galaxy. Further study is necessary to confirm this important result.

KW - Galaxy: open clusters and associations: general

KW - Infrared: general

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U2 - 10.1051/0004-6361:20054724

DO - 10.1051/0004-6361:20054724

M3 - Article

AN - SCOPUS:33748321121

VL - 455

SP - 923

EP - 930

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 3

ER -