X iv : a st ro - p h / 99 10 17 6 v 1 9 O ct 1 99 9 Einstein frame or Jordan frame ?

ar X iv : a st ro - p h / 99 10 53 6 v 1 2 9 O ct 1 99 9 Effect of intergalactic absorption in the TeV γ - ray spectrum of Mkn 501

We discuss an effect of the intergalactic absorption of the TeV γ-rays in time-averaged spectrum of Mkn 501 measured by the HEGRA collaboration. Analysis of the spectral behavior, variability time scale and relevant calculations of TeV γ-ray emission allow to conclude the presence of a noticeable absorption of the TeV γ-rays in the Mkn 501 energy spectrum.

X iv : a st ro - p h / 99 08 06 9 v 1 6 A ug 1 99 9 ISO observations of the BL Lac object PKS 2155 – 304

ar X iv : a st ro - p h / 96 11 14 3 v 1 1 9 N ov 1 99 6 A high deuterium abundance in the early Universe

ar X iv : a st ro - p h / 99 05 37 6 v 1 2 8 M ay 1 99 9 A 6 . 4 - hr positive superhump period in TV

ar X iv : a st ro - p h / 97 10 18 1 v 1 1 6 O ct 1 99 7 Note on a ’ hint ’ for an annual modulation signature of a 60 GeV WIMP