Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Zhang, Heshou"'
Autor:
Locatelli, Nicola, Ponti, Gabriele, Merloni, Andrea, Zheng, Xueying, Dennerl, Konrad, Haberl, Frank, Maitra, Chandreyee, Sanders, Jeremy, Sasaki, Manami, Zhang, Heshou
Publikováno v:
A&A 688, A85 (2024)
A dozen of patches of polarized radio emission spanning tens of degrees in the form of coherent and stationary loops are observed at radio frequencies across the sky. Their origin is usually associated to nearby shocks, possibly arising from close su
Externí odkaz:
http://arxiv.org/abs/2401.17291
Autor:
Fornieri, Ottavio, Zhang, Heshou
It has been pointed out in arXiv:2211.17057 that our recent (published) paper might be revised, due to an incorrect evaluation of the diffusion coefficients, $D(E)$, employed in the calculations. Unfortunately, there is no indication as to where the
Externí odkaz:
http://arxiv.org/abs/2212.01333
Autor:
Fornieri, Ottavio, Zhang, Heshou
Cosmic-ray (CR) diffusion is the result of the interaction of such charged particles against magnetic fluctuations. These fluctuations originate from large-scale turbulence cascading towards smaller spatial scales, decomposed into three different mod
Externí odkaz:
http://arxiv.org/abs/2210.15542
Autor:
Zhang, Heshou, Yan, Huirong
Fluorescence emission lines are broadly applied in observation for diffuse medium in the universe. They are normally observed around strong pumping source, tracing the gas in circumstellar medium, reflection nebula, and H\,{\sc ii} regions, etc. They
Externí odkaz:
http://arxiv.org/abs/2111.09184
This paper studies cosmic ray (CR) transport in magneto hydrodynamic (MHD) turbulence. CR transport is strongly dependent on the properties of the magnetic turbulence. We perform test particle simulations to study the interactions of CR with both tot
Externí odkaz:
http://arxiv.org/abs/2108.01936
Publikováno v:
Phys. Rev. Lett. 123, 221103 (2019)
In this letter we propose that the X-ray and the TeV observations in the vicinity of Geminga can be understood in the framework of anisotropic diffusion of injected electrons/positrons. This interpretation only requires the turbulence in the vicinity
Externí odkaz:
http://arxiv.org/abs/1904.11536
Publikováno v:
The Astrophysical Journal Letters (2020) Volume 902, Issue 1, id.L7, 7 pp
We report the identification of the polarization of ground state absorption lines from post-AGB 89~Hercules. Two ground state neutral iron lines are found to have counterintuitive high-amplitude polarizations and an unchanged polarization direction t
Externí odkaz:
http://arxiv.org/abs/1903.08675
Autor:
Zhang, Heshou, Chepurnov, Alexey, Yan, Huirong, Makwana, Kirit, Santos-Lima, Reinaldo, Appleby, Sarah
Publikováno v:
Nature Astronomy (2020), Volume 4, p. 1001-1008
Magneto-hydrodynamic (MHD) turbulence is ubiquitous and a fundamental ingredient underlying many astrophysical phenomena. The multiphase nature of interstellar medium and diversity of driving mechanisms give rise to spatial variation of turbulence pr
Externí odkaz:
http://arxiv.org/abs/1808.01913
Spectroscopic observations play essential roles in astrophysics. They are crucial for determining physical parameters in the universe, providing information about the chemistry of various astronomical environments. The proper execution of the spectro
Externí odkaz:
http://arxiv.org/abs/1807.03245
Autor:
Zhang, Heshou, Yan, Huirong
Magnetic fields play important roles in many astrophysical processes. However, there is no universal diagnostic for the magnetic fields in the interstellar medium (ISM) and each magnetic tracer has its limitation. Any new detection method is thus val
Externí odkaz:
http://arxiv.org/abs/1707.01015