Internal entrainment and the origin of jet-related broad-band emission in Centaurus A
Internal entrainment and the origin of jet-related broad-band emission in Centaurus A
复制标题
半人马座 A 的内部夹带和与喷流相关的宽带发射的起源
DOI:
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复制
发表时间:
2014
期刊:
影响因子:
--
通讯作者:
J. Vink
中科院分区:
文献类型:
--
作者:
S. Wykes;M. Hardcastle;A. Karakas;J. Vink
The dimensions of Fanaroff-Riley class I jets and the stellar densities at galactic centres imply that there will be numerous interactions between the jet and stellar winds. These may give rise to the observed diffuse and ‘knotty’ structure of the jets in the X-ray, and can also mass load the jets. We performed modelling of internal entrainment from stars intercepted by Centaurus A’s jet, using stellar evolution- and wind codes. From ph otometry and a code-synthesised population of 12 Gyr (Z = 0.004), 3 Gyr (Z = 0.008) and 0 60 Myr (Z = 0.02) stars, appropriate for the parent elliptical NGC 5128, the total number of stars in the jet is � 8 × 10 8 . Our model is energetically capable of producing the observed X-ray emission, even without young stars. We also reproduce the radio through X-ray spectrum of the jet, albeit in a downstream region with distinctly fewer young stars, and recover the mean X-ray spectral index. We derive an internal entrainment rate of � 2.3 × 10 −3 M⊙ yr −1 which implies substantial jet deceleration. Our absolute nucleosynthetic yields for the AGB stellar population in the jet show the highest amounts for 4 He, 16 O, 12 C, 14 N and 20 Ne. If some of the events at > 55 EeV detected by the Pierre Auger Observatory originate from internal entrainment in Centaurus A, we predict that their composition will be largely intermediate-mass nuclei with 16 O, 12 C and 14 N the key isotopes.
DOI:
10.1111/j.1365-2966.2008.14377.x
发表时间:
2009
影响因子:
4.8
作者:
Cappellari M
通讯作者:
Cappellari M
DOI:
10.1051/0004-6361/201117830
发表时间:
2012
期刊:
arXiv: Solar and Stellar Astrophysics
影响因子:
--
作者:
A. Sander;W.-R. Hamann;H. Todt
通讯作者:
H. Todt
影响因子:
6.5
作者:
C. Müller;M. Kadler;R. Ojha;R. Ojha;R. Ojha;M. Perucho;C. Grossberger;E. Ros;E. Ros;J. Wilms;J. Blanchard;M. Böck;B. Carpenter;M. Dutka;P. G. Edwards;H. Hase;S. Horiuchi;A. Kreikenbohm;J. Lovell;A. Markowitz;A. Markowitz;C. Phillips;C. Plötz;T. Pursimo;J. Quick;R. Rothschild;R. Schulz;T. Steinbring;J. Stevens;J. Trüstedt;A. Tzioumis
通讯作者:
C. Müller;M. Kadler;R. Ojha;R. Ojha;R. Ojha;M. Perucho;C. Grossberger;E. Ros;E. Ros;J. Wilms;J. Blanchard;M. Böck;B. Carpenter;M. Dutka;P. G. Edwards;H. Hase;S. Horiuchi;A. Kreikenbohm;J. Lovell;A. Markowitz;A. Markowitz;C. Phillips;C. Plötz;T. Pursimo;J. Quick;R. Rothschild;R. Schulz;T. Steinbring;J. Stevens;J. Trüstedt;A. Tzioumis