Multi-scale radio-infrared correlations in M 31 and M 33: The role of magnetic fields and star formation
Multi-scale radio-infrared correlations in M 31 and M 33: The role of magnetic fields and star formation
复制标题
M 31 和 M 33 的多尺度射电红外关联:磁场和恒星形成的作用
DOI:
10.1051/0004-6361/201218909
复制
发表时间:
2013
影响因子:
6.5
通讯作者:
Tabatabaei
中科院分区:
文献类型:
--
作者:
Tabatabaei
Interstellar magnetic fields and the propagation of cosmic ray electrons have an important impact on the radio-infrared (IR) correlation in galaxies. This becomes evident when studying different spatial scales within galaxies. We investigate the correlation between the IR and free-free/synchrotron radio continuum emission at 20 cm from the two local group galaxies M 31 and M 33 on spatial scales between 0.4 and 10 kpc. The multi-scale radio-IR correlations have been carried out using a wavelet analysis. The free-free and IR emission are correlated on all scales, but on some scales the synchrotron emission is only marginally correlated with the IR emission. The synchrotron-IR correlation is stronger in M 33 than in M 31 on small scales (<1 kpc), but it is weaker than in M 31 on larger scales. Taking the smallest scale on which the synchrotron-IR correlation exists as the propagation length of cosmic ray electrons, we show that the difference on small scales can be explained by the smaller propagation length in M 33 than in M 31. On large scales, the difference is due to the thick disk/halo in M 33, which is absent in M 31. A comparison of our data with data on NGC 6946, the LMC and M 51 suggests that the propagation length is determined by the ratio of ordered-to-turbulent magnetic field strength, which is consistent with diffusion of CR electrons in the ISM. As the diffusion length of CR electrons influences the radio-IR correlation, this dependence is a direct observational evidence of the importance of magnetic fields for the radio-IR correlation within galaxies. The star-formation rate per surface area only indirectly influences the diffusion length as it increases the strength of the turbulent magnetic field.
登录
查看更多内容
影响因子:
6.5
作者:
K. Chyży
通讯作者:
K. Chyży
DOI:
--
发表时间:
1987
期刊:
影响因子:
--
作者:
A. L. Edwards
通讯作者:
A. L. Edwards
DOI:
10.1088/0004-6256/136/1/18
发表时间:
2008-05
期刊:
The Astronomical Journal
影响因子:
--
作者:
B. Whitney;M. Sewiło;R. Indebetouw;T. Robitaille;M. Meixner;K. Gordon;M. Meade;B. Babler;J. Harris;J. Hora;S. Bracker;M. Povich;E. Churchwell;C. Engelbracht;B. For;M. Block;K. Misselt;U. Vijh;C. Leitherer;A. Kawamura;R. Blum;M. Cohen;Y. Fukui;A. Mizuno;N. Mizuno;S. Srinivasan;A. Tielens;K. Volk;J. Bernard;F. Boulanger;J. Frogel;J. Gallagher;V. Gorjian;D. Kelly;W. Latter;S. Madden;F. Kemper;J. Mould;A. Nota;M. Oey;K. Olsen;T. Onishi;R. Paladini;N. Panagia;P. Pérez-González;W. Reach;H. Shibai;S. Sato;Linda J. Smith;L. Staveley-Smith;T. Ueta;S. V. Dyk;M. Werner;M. Wolff;D. Zaritsky
通讯作者:
B. Whitney;M. Sewiło;R. Indebetouw;T. Robitaille;M. Meixner;K. Gordon;M. Meade;B. Babler;J. Harris;J. Hora;S. Bracker;M. Povich;E. Churchwell;C. Engelbracht;B. For;M. Block;K. Misselt;U. Vijh;C. Leitherer;A. Kawamura;R. Blum;M. Cohen;Y. Fukui;A. Mizuno;N. Mizuno;S. Srinivasan;A. Tielens;K. Volk;J. Bernard;F. Boulanger;J. Frogel;J. Gallagher;V. Gorjian;D. Kelly;W. Latter;S. Madden;F. Kemper;J. Mould;A. Nota;M. Oey;K. Olsen;T. Onishi;R. Paladini;N. Panagia;P. Pérez-González;W. Reach;H. Shibai;S. Sato;Linda J. Smith;L. Staveley-Smith;T. Ueta;S. V. Dyk;M. Werner;M. Wolff;D. Zaritsky
DOI:
10.1086/185885
发表时间:
1990-12
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Cong K. Xu
通讯作者:
Cong K. Xu
DOI:
--
发表时间:
1994
期刊:
影响因子:
--
作者:
N. Devereux;R. Price;L. Wells;N. Duric
通讯作者:
N. Duric