Statistical analysis of water masers in star-forming regions: Cepheus a and W75 N

L. Uscanga, J. Cantó, J. F. Gómez, G. Anglada, J. M. Torrelles, N. A. Patel, A. C. Raga, S. Curiel

Resultado de la investigación: Contribución a una revistaArtículo

2 Citas (Scopus)

Resumen

We have done a statistical analysis of Very Long Baseline Array (VLBA) data of water masers in the star-forming regions (SFRs) Cepheus A and W75 N, using correlation functions to study the spatial clustering and Doppler-velocity distribution of these masers. Two-point spatial correlation functions show a characteristic scale size for clusters of water maser spots ≲1AU, similar to the values found in other SFRs. This suggests that the scale for water maser excitation tends to be ≲1AU. Velocity correlation functions show power-law dependences with indices that can be explained by regular velocity fields, such as expansion and/or rotation. These velocity fields are similar to those indicated by the water maser proper-motion measurements; therefore, the velocity correlation functions appear to reveal the organized motion of water maser spots on scales larger than 1AU.

Idioma originalInglés
Páginas (desde-hasta)132-142
Número de páginas11
PublicaciónAstrophysical Journal
Volumen715
N.º1
DOI
EstadoPublicada - 1 ene 2010

Huella dactilar

water masers
statistical analysis
stars
velocity distribution
water
Very Long Baseline Array (VLBA)
proper motion
masers
power law
expansion
excitation

Citar esto

Uscanga, L., Cantó, J., Gómez, J. F., Anglada, G., Torrelles, J. M., Patel, N. A., ... Curiel, S. (2010). Statistical analysis of water masers in star-forming regions: Cepheus a and W75 N. Astrophysical Journal, 715(1), 132-142. https://doi.org/10.1088/0004-637X/715/1/132
Uscanga, L. ; Cantó, J. ; Gómez, J. F. ; Anglada, G. ; Torrelles, J. M. ; Patel, N. A. ; Raga, A. C. ; Curiel, S. / Statistical analysis of water masers in star-forming regions : Cepheus a and W75 N. En: Astrophysical Journal. 2010 ; Vol. 715, N.º 1. pp. 132-142.
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Uscanga, L, Cantó, J, Gómez, JF, Anglada, G, Torrelles, JM, Patel, NA, Raga, AC & Curiel, S 2010, 'Statistical analysis of water masers in star-forming regions: Cepheus a and W75 N', Astrophysical Journal, vol. 715, n.º 1, pp. 132-142. https://doi.org/10.1088/0004-637X/715/1/132

Statistical analysis of water masers in star-forming regions : Cepheus a and W75 N. / Uscanga, L.; Cantó, J.; Gómez, J. F.; Anglada, G.; Torrelles, J. M.; Patel, N. A.; Raga, A. C.; Curiel, S.

En: Astrophysical Journal, Vol. 715, N.º 1, 01.01.2010, p. 132-142.

Resultado de la investigación: Contribución a una revistaArtículo

TY - JOUR

T1 - Statistical analysis of water masers in star-forming regions

T2 - Cepheus a and W75 N

AU - Uscanga, L.

AU - Cantó, J.

AU - Gómez, J. F.

AU - Anglada, G.

AU - Torrelles, J. M.

AU - Patel, N. A.

AU - Raga, A. C.

AU - Curiel, S.

PY - 2010/1/1

Y1 - 2010/1/1

N2 - We have done a statistical analysis of Very Long Baseline Array (VLBA) data of water masers in the star-forming regions (SFRs) Cepheus A and W75 N, using correlation functions to study the spatial clustering and Doppler-velocity distribution of these masers. Two-point spatial correlation functions show a characteristic scale size for clusters of water maser spots ≲1AU, similar to the values found in other SFRs. This suggests that the scale for water maser excitation tends to be ≲1AU. Velocity correlation functions show power-law dependences with indices that can be explained by regular velocity fields, such as expansion and/or rotation. These velocity fields are similar to those indicated by the water maser proper-motion measurements; therefore, the velocity correlation functions appear to reveal the organized motion of water maser spots on scales larger than 1AU.

AB - We have done a statistical analysis of Very Long Baseline Array (VLBA) data of water masers in the star-forming regions (SFRs) Cepheus A and W75 N, using correlation functions to study the spatial clustering and Doppler-velocity distribution of these masers. Two-point spatial correlation functions show a characteristic scale size for clusters of water maser spots ≲1AU, similar to the values found in other SFRs. This suggests that the scale for water maser excitation tends to be ≲1AU. Velocity correlation functions show power-law dependences with indices that can be explained by regular velocity fields, such as expansion and/or rotation. These velocity fields are similar to those indicated by the water maser proper-motion measurements; therefore, the velocity correlation functions appear to reveal the organized motion of water maser spots on scales larger than 1AU.

KW - ISM: individual objects (Cepheus A, W75 N)

KW - ISM: jets and outflows

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Uscanga L, Cantó J, Gómez JF, Anglada G, Torrelles JM, Patel NA y otros. Statistical analysis of water masers in star-forming regions: Cepheus a and W75 N. Astrophysical Journal. 2010 ene 1;715(1):132-142. https://doi.org/10.1088/0004-637X/715/1/132