A broadband leptonic model for gamma-ray emitting microquasars
A broadband leptonic model for gamma-ray emitting microquasars
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DOI：
10.1051/0004-6361:20053633
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发表时间：
2005-09
影响因子：
6.5
通讯作者：
V. Bosch-Ramon;G. Romero;J. Paredes
中科院分区：
文献类型：
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作者：
V. Bosch-Ramon;G. Romero;J. Paredes
收到和接受的日期应插入后摘要。观测和理论研究指出，微类星体（MQs）可能是迄今为止探测到的大部分未识别伽马射线源的对应物。目前，还不知道一个合适的方案来解释这些物体发出的软X射线之外的辐射，也不知道无线电和高能辐射之间的精确联系。我们开发了一个新的模型，MQ喷流的动力学主导的冷质子和辐射主导的相对论轻子。喷流的物质含量和功率都与吸积过程有关。磁场被假定为接近均分，虽然它是附着在喷流物质和占主导地位。对于射流中的相对论粒子，它们的最大能量取决于加速效率和能量损失。该模型考虑了相对论性喷流粒子与磁场以及所有光子和物质场的相互作用。这种相互作用通过同步加速器、相对论性韧致辐射和逆康普顿（IC）过程产生大量的辐射，从射电到非常高的能量。还预计吸积过程的变化（例如通过轨道偏心率）所产生的发射的可变性。考虑了外光子场对γ射线吸收的影响，揭示了可能观察到的清晰的光谱特征。这个模型是一致的吸积的情况下，能量守恒定律，和目前的观测知识，并可以提供更深层次的物理信息的来源时，对多波长数据进行测试。
the date of receipt and acceptance should be inserted later Abstract. Observational and theoretical studies point to microquasars (MQs) as possible counterparts of a significant fraction of the unidentified gamma-ray sources detected so far. At present, a proper scenario to explain the emission beyond soft X-rays from these objects is not known, nor what the precise connection is between the radio and the high-energy radiation. We develop a new model where the MQ jet is dynamically dominated by cold protons and radiatively dominated by relativistic leptons. The matter content and power of the jet are both related with the accretion process. The magnetic field is assumed to be close to equipartition, although it is attached to and dominated by the jet matter. For the relativistic particles in the jet, their maximum energy depends on both the acceleration efficiency and the energy losses. The model takes into account the interaction of the relativistic jet particles with the magnetic field and all the photon and matter fields. Such interaction produces significant amounts of radiation from radio to very high energies through synchrotron, relativistic Bremsstrahlung, and inverse Compton (IC) processes. Variability of the emission produced by changes in the accretion process (e.g. via orbital eccentricity) is also expected. The effects of the gamma-ray absorption by the external photon fields on the gamma-ray spectrum have been taken into account, revealing clear spectral features that might be observed. This model is consistent to the accretion scenario, energy conservation laws, and current observational knowledge, and can provide deeper physical information of the source when tested against multiwavelength data.