نتایج جستجو برای: mkn 45
تعداد نتایج: 161786 فیلتر نتایج به سال:
The recent HEGRA observations of the blazar Mkn 501 show strong curvature in the very high energy γ-ray spectrum. Applying the γ-ray opacity derived from an empirically based model of the intergalactic infrared background radiation field (IIRF), to these observations, we find that the intrinsic spectrum of this source is consistent with a power-law: dNγ/dE ∝ E −α with α = 2.00 ± 0.03 over the r...
DNA-binding protein inhibitor ID-1 (ID1) serves an essential role in tumor progression, and the self-renewal and pluripotency of embryonic stem cells. However, the effect of ID1 on the stemness and cancer stem cell (CSC)-like properties of gastric adenocarcinoma cells remains to be elucidated. In the present study, effective ID1 knockdown was achieved in gastric cancer (GC) cells using small in...
New observations are reported of J-band spectra (1.04 μm – 1.4 μm) of three Seyfert 2 galaxies, Mkn 34, Mkn 78 and NGC 5929. In each case the spectral range includes the near-infrared lines of [Feii], [Pii], Hei and Paβ. Each Seyfert galaxy has a known radio jet, and we investigate the infrared line ratios of the nuclear and extended regions of each galaxy compared to the radio structure. In Mk...
The nearby BL Lacertae (BL Lac) object Markarian 421 (Mkn 421) at a red shift z = 0.031 was observed to undergo strong TeV γ-ray outbursts in the observational periods from December 1999 until May 2001. The time averaged flux level F (E > 1TeV) in the 1999/2000 season was (1.43± 0.04) ·10−11 ph cm−2 s−1, whereas in the 2000/2001 season the average integral flux increased to (4.19±0.04) ·10−11 p...
We use the new results of the HEGRA detector on the TeV γ–ray emission from MKN 501 to set upper limits on the energy density of the cosmic infrared background (CIRB). Contrary to previous interpretations of the γ–ray spectrum of MKN 421 as showing an intergalactic absorption cutoff at 5 TeV, the observed spectrum of MKN 501 extends beyond 10 TeV and appears to be unattenuated by γγ collisions ...
BACKGROUND Radix astragali mainly contains saponins, polysaccharides, flavonoids, amino acids and other chemical constituents of which total astragalosides have immunomodulatory, anti-viral, hepatoprotective, and gastric mucosa protective effects. OBJECTIVE To investigate the process conditions for extraction, purification and enrichment of total astragalosides by macroporous adsorption resin...
A detection of-rays from Mkn 421 at energies above 1 TeV is reported, based on observations made in December 1994-May 1995 with the rst two HEGRA Cherenkov telescopes. From the image analysis, 111 excess gamma candidates are obtained from the 26 h Telescope #1 (CT1) dataset (signiicance 4.0) and 218 from the 41 h Telescope #2 (CT2) dataset (signiicance 4.2) at zenith angles < 25. The combined s...
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