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Euv spectroscopy of mrk 421]
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Koenigl, Arieh |
| Copyright Year | 1997 |
| Description | In accordance with our proposal, we carried out and analyzed a successful Extreme Ultraviolet Explorer spectroscopic observation of the BL Lacertae object Mrk 421 in April/May 1995 (approx. 242 ksec useful time). During this period, the source underwent a flare that was detected also in simultaneous observations in the X-ray and TeV (gamma)ray energy bands. Our EUVE data, however, provided the best continuous coverage of the flare and therefore played a key role in the analysis of the multiwavelength observation campaign (Buckley et al. 1996). Our spectral analysis benefited from an efficient procedure that we employed for properly assessing the background contamination at the shortest wavelengths. As a result, we were able to identify strong absorption features at the shortest observed EUV wavelengths (approx. 65-75 A), which were missed in earlier, on axis EUVE observations that extended only down to approx. 75 A (Fruscione et al. 1996). Our observations and interpretation of Mrk 421 were described in Kartje et al. 1997 (see attached reprint). The results were also presented in a poster at the AGN session in the 18th Texas Symposium on Relativistic Astrophysicsheld (Chicago, December 1996). Our interpretation of the observations has formed the basis for a unified model of outflows in BL Lac objects and Broad Absorption Line QSOs (Kartje & Konigl 1997). Preliminary accounts of this work, which have included a description of the EUVE observations of BL Lac objects, were presented in posters in IAU Colloquium No. 163 on Accretion Phenomena and Associated Outflows (Port Douglas, July 1996) and in the Carnegie Observatories Workshop on Ejection of Matter from AGNs (Pasadena, February 1997). |
| File Size | 117444 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19980008477 |
| Archival Resource Key | ark:/13960/t2g78b008 |
| Language | English |
| Publisher Date | 1997-03-10 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Active Galaxies Gamma Rays Active Galactic Nuclei Energy Bands Flux Density Ultraviolet Spectroscopy Spectrum Analysis Astronomical Spectroscopy Absorption Spectra Extreme Ultraviolet Radiation Ultraviolet Astronomy Galactic Radiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
