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Do Fermi-LAT observations really imply very large Lorentz factors in GRB outflows ?
gamma-ray burst: general gamma-ray burst: individual: GRB 080916C radiative transfer radiation mechanisms: non-thermal
2011/10/20
Recent detections of GeV photons in a few GRBs by Fermi-LAT imply huge bulk Lorentz factors to avoid a large gamma gamma optical depth at high energy. Estimates can be as high as Gamma ~ 1000 in the m...
A Toy Model for 3:2:1 Ratio of HFQPOs in XTE J1550-564
black hole accretion disc magnetic field X-ray Binaries:XTE J1550-564 quasi-periodic oscillations state transition
2011/9/26
Based on a toy model of coexistence of the Blandford-Znajek (BZ) and magnetic coupling (MC) processes with a non-axisymmetric magnetic field, we explain a puzzling 3:2:1 ratio of the high-frequency Qu...
当具有各向同性速度分布的相对论电子穿过稠密气体区，或者轰击稠密气体区的表面时，切仑科夫效应将会产生一种特殊的原子或离子发射线，称做切仑科夫线状发射。这一预言在光学波段已由实验室的实验所证实。本文中指出了切仑科夫线状辐射在类星体和赛弗特1星系的宽发射线研究中的重要性，利用此新机制有可能解决类星体研究中的一些重大且长期没有解决的疑惑。例如宽氢线之间存在的反常强度比，特别是反常lya/lyb强度比的问题...
强磁场中相对论电子系集体的共振逆康普顿散射谱
高能天体物理学辐射机制:非热 方法:解析 gamma射线:一般
2011/9/26
强磁场中相对论电子的共振逆康普顿散射(RICS)是产生伽玛射线的有效机制. 以前的工作曾论证, 伽玛暴的早期伽玛射线辐射可能主要由该机制产生.利用此辐射机制, 伽玛暴研究中的一些困惑有可能得到较好的解释, 例如, 观测统计给出的``Amati关系''的起源, 两段式(折断式)的幂律谱的形成, 特别是其中的``死线问题''的解决方案, 还有偏振的存在, 等等. 文章中将重点讨论折断幂律谱形成问题.基...
We observed the young pulsar J1357--6429 with the {\it Chandra} and {\it XMM-Newton} observatories. The pulsar spectrum fits well a combination of absorbed power-law model ($\Gamma=1.7\pm0.6$) and bla...
Addressing the spin question in gravitational-wave searches: Waveform templates for inspiralling compact binaries with nonprecessing spins
Addressing spin question gravitational-wave searches Waveform templates inspiralling
2011/10/18
This paper presents a post-Newtonian (PN) template family of gravitational waveforms from inspiralling compact binaries with non-precessing spins, where the spin effects are described by a single "red...
Gamma-Ray and Parsec-Scale Jet Properties of a Complete Sample of Blazars From the MOJAVE Program
Gamma-Ray Parsec-Scale Jet Properties Complete Sample Blazars From MOJAVE Program
2011/10/19
We investigate the Fermi LAT gamma-ray and 15 GHz VLBA radio properties of a joint gamma-ray- and radio-selected sample of AGNs obtained during the first 11 months of the Fermi mission (2008 Aug 4 - 2...
We analyze the recently released CoGeNT data with a focus on their time-dependent properties. Using various statistical techniques, we confirm the presence of modulation in the data, and find a signif...
A Systematic Study on Energy Dependence of Quasi-Periodic Oscillation Frequency in GRS 1915+105
accretion, accretion disks — black hole physics — stars: individual (GRS 1915+105) — stars: oscillations
2011/10/11
Systematically studying all the RXTE/PCA observations for GRS 1915+105 before November 2010, we have discovered three additional patterns in the relation between Quasi-Periodic Oscillation (QPO) frequ...
Spectral-Temporal Simulations of Internal Dissipation Models of Gamma-Ray Bursts
Spectral-Temporal Simulations Internal Dissipation Models Gamma-Ray Bursts
2011/10/19
We present calculations of the time evolution of the prompt spectra of gamma-ray burst models involving generic internal dissipation regions, including internal shocks, either by itself or in the pres...
A consistent first-order model for relativistic heat flow
consistent first-order model relativistic heat flow
2011/10/18
This paper revisits the problem of heat conduction in relativistic fluids, associated with issues concerning both stability and causality. It has long been known that the problem requires information ...
Constraints on the Synchrotron Shock Model for the Fermi GBM Gamma-Ray Burst 090820A
Constraints Synchrotron Shock Model Fermi GBM Gamma-Ray Burst 090820A
2011/10/18
Discerning the radiative dissipation mechanism for prompt emission in Gamma-Ray Bursts (GRBs) requires detailed spectroscopic modeling that straddles the $\nu F_{\nu}$ peak in the 100 keV - 1 MeV rang...
Spectroscopic analysis of interaction between an EIT wave and a coronal upflow region
Spectroscopic analysis of interaction between an EIT wave and a coronal upflow region
2011/10/20
We report a spectroscopic analysis of an EIT wave event that occurred in active region 11081 on 2010 June 12 and was associated with an M2.0 class flare. The wave propagated near circularly. The south...
We investigate density perturbations sourced by a curvaton with a generic energy potential. The key feature of a curvaton potential which deviates from quadratic is that the curvaton experiences a non...
Two phase, inward-then-outward migration of Jupiter and Saturn in the gaseous Solar Nebula
accretion, accretion disks – planets and satellites: formation – hydrodynamics – methods: numerical
2011/10/20
It has recently been shown that the terrestrial planets and asteroid belt can be reproduced if the giant planets underwent an inward-then-outward migration (the "Grand Tack"; Walsh et al 2011). Inward...