منابع مشابه
The near - IR shape of the big blue bump emission from quasars : under the hot dust emission
One primary difficulty in understanding the nature of the putative accretion disk in the central engine of AGNs is that some of its key intrinsic spectral signatures are buried under the emissions from the surrounding regions, i.e. the broad line region (BLR) and the obscuring torus. We argue here that these signatures can be revealed by using optical and near-IR polarization. At least in some ...
متن کاملBig Blue Bump and Transient Active Regions in Seyfert Galaxies
An important feature of the EUV spectrum (known as the Big Blue Bump, hereafter BBB) in Seyfert Galaxies is the narrow range in its cutoff energy E c from source to source, even though the luminosity changes by 4 orders of magnitude. Here we show that if the BBB is due to accretion disk emission, then in order to account for this “universality” in the value of E c , the emission mechanism is pr...
متن کاملLead-Free and PbSn Bump Electromigration Testing
As the electronics industry continues to push for miniaturization, several reliability factors become vital issues. The demand for a high population of smaller and smaller solder bumps, while also increasing the current, have resulted in a significant increase in the current density. As outlined in the International Technology of Roadmap for Semiconductors (ITRS), this trend makes electromigrat...
متن کاملGalactic Free-free Emission and Hα
We review present understanding of Galactic free–free emission and its possible importance to CMB fluctuation measurements. Current results, from both " direct " observations in the microwave band and from Hα studies, suggest that this foreground does not represent a serious obstacle to mapping the CMB; however, this is based on limited information and we emphasize the need for more exhaustive ...
متن کاملFree-free Emission at Low Radio Frequencies
We discuss free-free radio emission from ionized gas in the intergalactic medium. Because the emissivity is proportional to the square of the electron density, the mean background is strongly sensitive to the spatial clumping of free electrons. Using several existing models for the clumping of ionized gas, we find that the expected free-free distortion to the cosmic microwave background (CMB) b...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1994
ISSN: 0074-1809
DOI: 10.1017/s007418090017545x