The young stellar population at the center of NGC 205

L. Monaco, I. Saviane, S. Perina, M. Bellazzini, A. Buzzoni, L. Federici, F. Fusi Pecci, S. Galleti

Resultado de la investigación: Article

22 Citas (Scopus)

Resumen

Context. NGC 205 is a peculiar dwarf elliptical galaxy hosting in its center a population of young blue stars. Their origin is still matter of debate, the central fresh star formation activity possibly being related to dynamical interactions between NGC 205 and M 31. Alms. The star formation history in the central 30″ (∼120 pc) around the NGC 205 central nucleus is investigated in order to obtain clues to the origin of the young stellar population. Methods. Deep HST/ACS CCD photometry is compared with theoretical isochrones and luminosity functions to characterize the stellar content of the region under study and compute the recent SF rate. Results. Our photometry reveals a previously undetected blue plume of young stars clearly distinguishable down to I ≃ 26. Our analysis suggests that 1.9 × 105 M were produced between approximately 62 Myr and 335 Myr ago in the NGC 205 inner regions, with a latest minor episode occurring ∼25 Myr ago. This implies a star formation rate of ∼7 × 10 -4 M/yr over this period. Conclusions. The excellent fit of the observed luminosity function of young main sequence stars obtained with a model having a constant star formation rate argues against a tidally triggered star formation activity over the last ∼300 Myr. Rather, a constant SF may be consistent with NGC 205 being on its first interaction with M 31.

Idioma originalEnglish
PublicaciónAstronomy and Astrophysics
Volumen502
N.º2
DOI
EstadoPublished - ago 2009

Huella dactilar

young population
star formation
star formation rate
photometry
luminosity
blue stars
main sequence stars
elliptical galaxies
dwarf galaxies
plumes
charge coupled devices
plume
histories
interactions
stars
nuclei
history
rate
young

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Monaco, L., Saviane, I., Perina, S., Bellazzini, M., Buzzoni, A., Federici, L., ... Galleti, S. (2009). The young stellar population at the center of NGC 205. Astronomy and Astrophysics, 502(2). https://doi.org/10.1051/0004-6361/200912412
Monaco, L. ; Saviane, I. ; Perina, S. ; Bellazzini, M. ; Buzzoni, A. ; Federici, L. ; Fusi Pecci, F. ; Galleti, S. / The young stellar population at the center of NGC 205. En: Astronomy and Astrophysics. 2009 ; Vol. 502, N.º 2.
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abstract = "Context. NGC 205 is a peculiar dwarf elliptical galaxy hosting in its center a population of young blue stars. Their origin is still matter of debate, the central fresh star formation activity possibly being related to dynamical interactions between NGC 205 and M 31. Alms. The star formation history in the central 30″ (∼120 pc) around the NGC 205 central nucleus is investigated in order to obtain clues to the origin of the young stellar population. Methods. Deep HST/ACS CCD photometry is compared with theoretical isochrones and luminosity functions to characterize the stellar content of the region under study and compute the recent SF rate. Results. Our photometry reveals a previously undetected blue plume of young stars clearly distinguishable down to I ≃ 26. Our analysis suggests that 1.9 × 105 M⊙ were produced between approximately 62 Myr and 335 Myr ago in the NGC 205 inner regions, with a latest minor episode occurring ∼25 Myr ago. This implies a star formation rate of ∼7 × 10 -4 M⊙/yr over this period. Conclusions. The excellent fit of the observed luminosity function of young main sequence stars obtained with a model having a constant star formation rate argues against a tidally triggered star formation activity over the last ∼300 Myr. Rather, a constant SF may be consistent with NGC 205 being on its first interaction with M 31.",
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Monaco, L, Saviane, I, Perina, S, Bellazzini, M, Buzzoni, A, Federici, L, Fusi Pecci, F & Galleti, S 2009, 'The young stellar population at the center of NGC 205', Astronomy and Astrophysics, vol. 502, n.º 2. https://doi.org/10.1051/0004-6361/200912412

The young stellar population at the center of NGC 205. / Monaco, L.; Saviane, I.; Perina, S.; Bellazzini, M.; Buzzoni, A.; Federici, L.; Fusi Pecci, F.; Galleti, S.

En: Astronomy and Astrophysics, Vol. 502, N.º 2, 08.2009.

Resultado de la investigación: Article

TY - JOUR

T1 - The young stellar population at the center of NGC 205

AU - Monaco, L.

AU - Saviane, I.

AU - Perina, S.

AU - Bellazzini, M.

AU - Buzzoni, A.

AU - Federici, L.

AU - Fusi Pecci, F.

AU - Galleti, S.

PY - 2009/8

Y1 - 2009/8

N2 - Context. NGC 205 is a peculiar dwarf elliptical galaxy hosting in its center a population of young blue stars. Their origin is still matter of debate, the central fresh star formation activity possibly being related to dynamical interactions between NGC 205 and M 31. Alms. The star formation history in the central 30″ (∼120 pc) around the NGC 205 central nucleus is investigated in order to obtain clues to the origin of the young stellar population. Methods. Deep HST/ACS CCD photometry is compared with theoretical isochrones and luminosity functions to characterize the stellar content of the region under study and compute the recent SF rate. Results. Our photometry reveals a previously undetected blue plume of young stars clearly distinguishable down to I ≃ 26. Our analysis suggests that 1.9 × 105 M⊙ were produced between approximately 62 Myr and 335 Myr ago in the NGC 205 inner regions, with a latest minor episode occurring ∼25 Myr ago. This implies a star formation rate of ∼7 × 10 -4 M⊙/yr over this period. Conclusions. The excellent fit of the observed luminosity function of young main sequence stars obtained with a model having a constant star formation rate argues against a tidally triggered star formation activity over the last ∼300 Myr. Rather, a constant SF may be consistent with NGC 205 being on its first interaction with M 31.

AB - Context. NGC 205 is a peculiar dwarf elliptical galaxy hosting in its center a population of young blue stars. Their origin is still matter of debate, the central fresh star formation activity possibly being related to dynamical interactions between NGC 205 and M 31. Alms. The star formation history in the central 30″ (∼120 pc) around the NGC 205 central nucleus is investigated in order to obtain clues to the origin of the young stellar population. Methods. Deep HST/ACS CCD photometry is compared with theoretical isochrones and luminosity functions to characterize the stellar content of the region under study and compute the recent SF rate. Results. Our photometry reveals a previously undetected blue plume of young stars clearly distinguishable down to I ≃ 26. Our analysis suggests that 1.9 × 105 M⊙ were produced between approximately 62 Myr and 335 Myr ago in the NGC 205 inner regions, with a latest minor episode occurring ∼25 Myr ago. This implies a star formation rate of ∼7 × 10 -4 M⊙/yr over this period. Conclusions. The excellent fit of the observed luminosity function of young main sequence stars obtained with a model having a constant star formation rate argues against a tidally triggered star formation activity over the last ∼300 Myr. Rather, a constant SF may be consistent with NGC 205 being on its first interaction with M 31.

KW - Galaxies: Dwarf

KW - Galaxies: Evolution

KW - Galaxies: Individual: Ngc 205 de

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SN - 0004-6361

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Monaco L, Saviane I, Perina S, Bellazzini M, Buzzoni A, Federici L y otros. The young stellar population at the center of NGC 205. Astronomy and Astrophysics. 2009 ago;502(2). https://doi.org/10.1051/0004-6361/200912412