The MeV properties of the blazars PKS 1622-297, 3C 454.3 and CTA 102 have been analyzed using COMPTEL data (0.75-30 MeV). Our results show significant detections of PKS 1622-297 (5.9σ) in the 10-30 MeV band during i...The MeV properties of the blazars PKS 1622-297, 3C 454.3 and CTA 102 have been analyzed using COMPTEL data (0.75-30 MeV). Our results show significant detections of PKS 1622-297 (5.9σ) in the 10-30 MeV band during its γ ray flare in 1995, and of 3C 454.3(5.6σ) in the sum of 8 years observations in the 3-10 MeV band. By comparing the MeV results to the ones obtained in neighboring bands by the Compton Gamma Ray Observatory (CGRO) experiments EGRET and OSSE, we reveal some properties of these 3 blazars at γ ray energies.展开更多
We report results of our optical photometric observations of ten gamma-ray loud blazers, namely: 0219+428 (3C66A), PKS 0420-014 (OA 129), S5 0716+714, 0754+100 (OI 090.4), 0827+243 (OJ248), 1652+398 (Mrk 501), 2200+42...We report results of our optical photometric observations of ten gamma-ray loud blazers, namely: 0219+428 (3C66A), PKS 0420-014 (OA 129), S5 0716+714, 0754+100 (OI 090.4), 0827+243 (OJ248), 1652+398 (Mrk 501), 2200+420 (BL Lacertae), 2230+114 (CTA 102), 2251+158 (3C 454.3) and 2344+514. The observations were carried out in September-October, 2000 using the 70 cm optical telescope at Abstumani Observatory, Georgia. We found intra-day variations in 0420-014, S5 0716+714, BL Lacertae and CTA 102. A variation of 0.3 magnitude over a time scale of about 3 hours was observed in the R passband in BL Lacertae on JD 2451827. We did not detect any variation in 3C 66A, Mrk 501, or 3C 454.3 during our observations. Nor did we detect any clear evidence of variation in 1ES 2344+514 during our two weeks' observing run of the TeV gamma-ray source.展开更多
文摘The MeV properties of the blazars PKS 1622-297, 3C 454.3 and CTA 102 have been analyzed using COMPTEL data (0.75-30 MeV). Our results show significant detections of PKS 1622-297 (5.9σ) in the 10-30 MeV band during its γ ray flare in 1995, and of 3C 454.3(5.6σ) in the sum of 8 years observations in the 3-10 MeV band. By comparing the MeV results to the ones obtained in neighboring bands by the Compton Gamma Ray Observatory (CGRO) experiments EGRET and OSSE, we reveal some properties of these 3 blazars at γ ray energies.
基金Supported by the National Natural Science Foundation of China
文摘We report results of our optical photometric observations of ten gamma-ray loud blazers, namely: 0219+428 (3C66A), PKS 0420-014 (OA 129), S5 0716+714, 0754+100 (OI 090.4), 0827+243 (OJ248), 1652+398 (Mrk 501), 2200+420 (BL Lacertae), 2230+114 (CTA 102), 2251+158 (3C 454.3) and 2344+514. The observations were carried out in September-October, 2000 using the 70 cm optical telescope at Abstumani Observatory, Georgia. We found intra-day variations in 0420-014, S5 0716+714, BL Lacertae and CTA 102. A variation of 0.3 magnitude over a time scale of about 3 hours was observed in the R passband in BL Lacertae on JD 2451827. We did not detect any variation in 3C 66A, Mrk 501, or 3C 454.3 during our observations. Nor did we detect any clear evidence of variation in 1ES 2344+514 during our two weeks' observing run of the TeV gamma-ray source.
