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arXiv 0704.3533astro-ph
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2004-05年1 ES 2344 +514的甚高能$γ$射线和近红外观测

Very High Energy $γ$-ray and Near Infrared observations of 1ES2344+514 during 2004-05

S. V. Godambe, R. C. Rannot, K. S. Baliyan, A. K. Tickoo, S. Thoudam, V. K. Dhar, P. Chandra, K. K. Yadav, K. Venugopal, N. Bhatt, S. Bhattacharyya, K. Chanchal… 展开作者

S. V. Godambe, R. C. Rannot, K. S. Baliyan, A. K. Tickoo, S. Thoudam, V. K. Dhar, P. Chandra, K. K. Yadav, K. Venugopal, N. Bhatt, S. Bhattacharyya, K. Chanchalani, S. Ganesh, H. C. Goyal, U. C. Joshi, R. K. Kaul, M. Kothari, S. Kotwal, M. K. Koul, R. Koul, S. Sahaynathan, C. Shah, M. Sharma

摘要:

我们分别用TACTIC和MIRO望远镜观测了BL Lac天体1 ES 2344 +514(z = 0.044)的VHE γ射线和近红外波段。观察时间为2004年10月18日至12月9日和2005年10月27日至2006年1月1日。对TACTIC数据的详细分析表明,无论是在总体数据中,还是在夜间,从源方向来看,都没有统计学意义上的伽马射线信号。我们估计的上限I($\geq$ 1.5 TeV)$\leq 3.84 \times 10^{-12}$光子cm $^{-2}$ s $^{-1}$在3 $σ$的综合$γ$射线通量的置信水平。此外,我们还比较了TACTIC TeV光变曲线与RXTE ASM(2- 12 keV)的光变曲线,发现在这两个能量区域中,来自源的信号强度没有统计学显著增加。在2004年的IR观测中,1 ES 2344 +514在J和H波段都显示出低水平(~0.06星等)的逐日变化。然而,在2005年的观测期间,该源的亮度从2005年10月的J = 12.64增加到2005年12月6日的J = 12.23,增加了0.41等。然后在2005年12月6日至10日期间减弱约0.2等。在J和H两个带中同时看到变化。光的传播时间参数表明,发射区的大小是$10^{17}$厘米的数量级。

英文摘要:

We have observed the BL Lac object 1ES2344+514 (z = 0.044) in Very High Energy (VHE) gamma-ray and near-infrared wavelength bands with TACTIC and MIRO telescopes respectively. The observations were made from 18th October to 9th December 2004 and 27th October 2005 to 1st January 2006. Detailed analysis of the TACTIC data indicates absence of a statistically significant gamma-ray signal both in overall data and on a nightly basis from the source direction. We estimate an upper limit of I($\geq$1.5 TeV)$\leq 3.84 \times 10^{-12}$ photons cm$^{-2}$ s$^{-1}$ at a 3$σ$ confidence level on the integrated $γ$-ray flux. In addition, we have also compared TACTIC TeV light curves with those of the RXTE ASM (2-12keV) for the contemporary period and find that there are no statistically significant increases in the signal strengths from the source in both these energy regions. During 2004 IR observations, 1ES2344+514 shows low level (~0.06 magnitude) day-to-day variation in both, J & H bands. However, during 2005 observation epoch, the source brightens up by about 0.41 magnitude from its October 2005 level J magnitude= 12.64 to J = 12.23 on December 6, 2005. It then fades by about 0.2 magnitude during 6 to 10 December, 2005. The variation is seen in both, J & H, bands simultaneously. The light travel time arguments suggest that the emission region size is of the order of $10^{17}$ cms.

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