skip to main content
Idioma:
Primo Advanced Search
Primo Advanced Search Query Term
Primo Advanced Search prefilters
Busca Simples

Redetermination of galactic spiral density wave parameters based on spectral analysis of masers radial velocities

Bajkova, A. T. ; Bobylev, V. V.

Astronomy letters, 2012-09, Vol.38 (9), p.549-561 [Periódico revisado por pares]

Dordrecht: SP MAIK Nauka/Interperiodica

Texto completo disponível

Citações Citado por
  • Título:
    Redetermination of galactic spiral density wave parameters based on spectral analysis of masers radial velocities
  • Autor: Bajkova, A. T. ; Bobylev, V. V.
  • Assuntos: Astronomy ; Astrophysics and Astroparticles ; Density ; Observations and Techniques ; Physics ; Physics and Astronomy ; Spectrum analysis ; Stars & galaxies ; Velocity ; Wave power
  • É parte de: Astronomy letters, 2012-09, Vol.38 (9), p.549-561
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: To redetermine the Galactic spiral density wave parameters, we have performed a spectral (Fourier) analysis of the radial velocities for 44 masers with known trigonometric parallaxes, proper motions, and line-of-sight velocities. The masers are distributed in awide range of Galactocentric distances (3.5 kpc < R < 13.2 kpc) and are characterized by a wide scatter of position angles θ in the Galactic XY plane. This has required an accurate allowance for the dependence of the perturbation phase both on the logarithm of the Galactocentric distances and on the position angles of the objects. To increase the significance of the extraction of periodicities from data series with large gaps, we have proposed and implemented a spectrum reconstruction method based on a generalized maximum entropy method. As a result, we have extracted a periodicity describing a spiral density wave with the following parameters from the maser radial velocities: the perturbation amplitude f R = 7.7 −1.5 +1.7 km s −1 , the perturbation wavelength λ = 2.2 −0.1 +0.4 kpc, the pitch angle of the spiral density wave i = −5 −0.9° +0.2° , and the phase of the Sun in the spiral density wave χ ⊙ = −147 −17° +3° .
  • Editor: Dordrecht: SP MAIK Nauka/Interperiodica
  • Idioma: Inglês;Russo
Links
Voltar para lista de resultados
Ir para página anteriorAnterior Resultado  8 AvançarIr para próxima página

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.