Ein neues Osteosyntheseplattenprinzip nach biologisch-dynamischen Gesichtspunkten

Wolter, D.

doi:10.1007/978-3-642-76328-1_36

Cited by 9 publications

(25 citation statements)

References 1 publication

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“…Again, this figure should be compared with fig. 3 of Wolter et al (1998), which shows the same plot for a sample of eight HBLs. In that case the BeppoSAX and ROSAT spectral indices agree within the errors for all but one source.…”

Section: Rosat Pspc Datamentioning

confidence: 68%

“…2 should be compared with fig. 2 of (Wolter et al 1998, see also Beckmann et al 2002), which plots the BeppoSAX 1‐keV fluxes versus the corresponding ROSAT fluxes for a sample of eight HBLs. There the two fluxes are within 30 per cent for most sources and the points follow more closely the line of equal fluxes.…”

Section: Rosat Pspc Datamentioning

confidence: 99%

“…The updated BeppoSAX version of this dependence is shown in Fig. 5, which plots the BeppoSAX spectral index (0.1–10 keV) versus the logarithm of the peak frequency for our sources (open pentagons), the other 1‐Jy sources studied in Paper I (filled circles), the HBLs studied by Wolter et al (1998) and Beckmann et al (2002) (open squares), and other BL Lacs studied by BeppoSAX . These include, in order of increasing peak frequency: PKS 0537−441 (filled pentagon, Pian et al 2002); ON 231 (star, α x in the 0.1–3.8 keV range, Tagliaferri et al 2000); S5 0716+714 (open circle, Giommi et al 1999); PKS 2155−304 (filled triangle, Giommi et al 1998); Mrk 421 (cross, α x in the 0.1–1.6 keV range, Fossati et al 2000); 1ES 2344+514 (open triangle, Giommi, Padovani & Perlman 2000); and Mrk 501 (filled square, Pian et al 1998).…”

Section: Spectral Energy Distributionsmentioning

confidence: 99%

“…The ν peak values for the sources studied in this paper have been taken from Sambruna, Maraschi & Urry (1996), who fitted a parabola to the ν f ν broad‐band spectra. The ν peak values for the HBLs studied by Wolter et al (1998) and Beckmann et al (2002) are taken from those papers and similarly the values for the additional sources are taken from the referenced papers.…”

Section: Spectral Energy Distributionsmentioning

confidence: 99%

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BeppoSAX observations of 1-Jy BL Lacertae objects -- II

Padovani

Costamante

Giommi

et al. 2004

Monthly Notices of the Royal Astronomical Society

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We present new BeppoSAX LECS and MECS observations, covering the energy range 0.1–10 keV (observer's frame), of four BL Lacertae objects selected from the 1‐Jy sample. All sources display a flat (αx∼ 0.7) X‐ray spectrum, which we interpret as inverse Compton emission. One object shows evidence for a low‐energy steepening (Δαx∼ 0.9), which is probably due to the synchrotron component merging into the inverse Compton one around ∼2 keV. A variable synchrotron tail would explain why the ROSAT spectra of our sources are typically steeper than the BeppoSAX ones (Δαx∼ 0.7). The broad‐band spectral energy distributions fully confirm this picture, and model fits using a synchrotron inverse Compton model allow us to derive the physical parameters (intrinsic power, magnetic field, etc.) of our sources. By combining the results of this paper with those previously obtained on other sources, we present a detailed study of the BeppoSAX properties of a well‐defined subsample of 14 X‐ray bright [fx(0.1–10) keV > 3 × 10−12 erg cm−2 s−1] 1‐Jy BL Lacs. We find a very tight proportionality between nearly simultaneous radio and X‐ray powers for the 1‐Jy sources in which the X‐ray band is dominated by inverse Compton emission, which points to a strong link between X‐ray and radio emission components in these objects.

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Section: Rosat Pspc Datamentioning

confidence: 68%

Section: Rosat Pspc Datamentioning

confidence: 99%

Section: Spectral Energy Distributionsmentioning

confidence: 99%

Section: Spectral Energy Distributionsmentioning

confidence: 99%

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BeppoSAX observations of 1-Jy BL Lacertae objects -- II

Padovani

Costamante

Giommi

et al. 2004

Monthly Notices of the Royal Astronomical Society

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“…However, recent wide‐band X‐ray spectra of Mrk 421 ( Fossati et al 1998; Guainazzi et al 1999), PKS 2155−304 and other bright BL Lacs require more complex models like a broken power‐law or a curved spectrum (e.g. Giommi et al 1998; Wolter et al 1998).…”

Section: Resultsmentioning

confidence: 99%

The 0.1-100 keV spectrum and variability of Mrk 421 in a high state

Malizia¹,

Capalbi²,

Fiore³

et al. 2000

Monthly Notices of the Royal Astronomical Society

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The results of a BeppoSAX target of opportunity (TOO) observation of the BL Lac object Mrk 421 during a high‐intensity state are reported and compared with monitoring X‐ray data collected with the BeppoSAX Wide Field Cameras (WFC) and the RXTE All Sky Monitor (ASM). The 0.1–100 keV spectrum of Mrk 421 shows continuous convex curvature that can be interpreted as the high‐energy end of the synchrotron emission. The source shows significant short‐term temporal and spectral variability, which can be interpreted in terms of synchrotron cooling. The comparison of our results with those of previous observations when the source was a factor 3–5 fainter shows evidence for strong spectral variability, with the maximum of the synchrotron power shifting to higher energy during high states. This behaviour suggests an increase in the number of energetic electrons during high states.

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Progress in understanding blazars from BeppoSAX observations

Maraschi

Chiappetti²,

Fossati

et al. 2000

Advances in Space Research

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Results obtained with BeppoSAX observations of blazars within various collaborative programs are presented. The spectral similarity "paradigm", whereby the spectral energy distributions of blazars follow a sequence, leading to a unified view of the whole population, is briefly illustrated. We concentrate on recent observations of flares and associated spectral variability long for three objects at the "blue" end of the spectral sequence, namely PKS 2155-304, Mkn 421 and Mkn 501. The results are discussed in terms of a general analytic synchrotron self-Compton interpretation of the overall spectrum. The physical parameters of the quasi-stationary emission region can be derived with some confidence, while the variability mechanism(s) must be complex.

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Ein neues Osteosyntheseplattenprinzip nach biologisch-dynamischen Gesichtspunkten

Cited by 9 publications

References 1 publication

BeppoSAX observations of 1-Jy BL Lacertae objects -- II

BeppoSAX observations of 1-Jy BL Lacertae objects -- II

The 0.1-100 keV spectrum and variability of Mrk 421 in a high state

Progress in understanding blazars from BeppoSAX observations

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