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[astro-ph/0702587] Exciting Dark Matter and the INTEGRAL/SPI 511 keV signal

such a particle could produce a substantial fraction of the 511 keV line observed by INTEGRAL/SPI in the inner Milky Way. Only a small fraction of the WIMPs have sufficient energy to excite, and that fraction drops sharply with galactocentric radius, naturally yielding a radial cutoff, as observed. Even if the scattering probability in the inner kpc is 1% p...

Lunch talk Oct. 2023: Soft X-ray excess AGNs The warm corona interpretation-云南大学中国西南天文研究所

AGN is one of the most powerful X-ray sources in the universe. Most AGN spectra show a soft X-ray excess (SE) above the 2–10 keV power law extrapolation. One popular... we calculate the relativistic warm coronal flux in high-accretion-rate systems. The numerical results show that the warm coronal flux generally rises first and then drops with incr...

Kev009.com

Toggle navigation Kev009.com The Art of Software Development Management A fallacy in software development and management thereof is the idea that software developers are fungible. This is not intuitive for folks to reason about because programming does entail at a fundamental level accounting and bookkeeping. Put this into a container, gr...

[1408.4388] Comment on the paper Dark matter searches going bananas: the contribution of Potassium (and Chlorine) to the 3.5 keV line by T. Jeltema and S. ...

1408.1699] it was claimed that if one limits the analysis of the data to the interval 3-4 keV, the significance of the detection of the line at 3.53 keV drops below 2 sigma. In this note we show that such a restriction is not justified, as the continuum is well-modeled as a power law up to 8 keV, and parameters of the background model are well constraine...

NSTL回溯数据服务平台

keV proton implants in GaAs is evaluated from the several depth distributions of carrier removal which are formed by implants with different tilting angles and measured by the Copeland method. It is found that the lateral spread of carrier removal is largest at a depth near the projected range of protons. For instance the removal rate drops to 10% of i...

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[2303.11799] Investigation of a small X-ray flaring event in NLS1 galaxy NGC 4051

keV and 10-50 keV bands suggests different origins of the iron emission line and the Compton hump. From the spectral analysis, we found that the reflection fraction drops significantly during the flare, accompanied by an increase in the coronal height above the disc. The spectrum became soft during the flare supporting the softer when brighter natu...