MULTIWAVELENGTH MONITORING OF THE ENIGMATIC NARROW-LINE SEYFERT 1 PMN J0948+0022 IN 2009 MARCH–JULY
MULTIWAVELENGTH MONITORING OF THE ENIGMATIC NARROW-LINE SEYFERT 1 PMN J0948+0022 IN 2009 MARCH–JULY
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DOI：
10.1088/0004-637x/707/1/727
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
F. Collaboration;E. Angelakis;C. Bailyn;H. Bignall;J. Blanchard;E. Bonning;M. Buxton;R. Canterna-
中科院分区：
文献类型：
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作者：
F. Collaboration;E. Angelakis;C. Bailyn;H. Bignall;J. Blanchard;E. Bonning;M. Buxton;R. Canterna-
继最近从射电强的窄线 Seyfert 1 星系 PMN J0948+0022 (z = 0.5846) 发现 γ 射线之后，我们开始了从射电到 γ 射线的多波长活动，该活动于 2009 年 3 月底至 7 月初进行。该源在所有观察到的波长下都显示出活动：从光学频率到γ射线频率总体呈下降趋势，随后在距γ射线发射峰值不到两个月后无线电发射增加。最大的通量变化发生在 X 射线波段，约为 4 倍。最小的是紫外和近红外频率，其中检测到的光子速率下降了 1.6-1.9 倍。在采样率最高的光学波长处，可以观察到日尺度变化，通量变化高达约 3 倍。在这次活动中观察到的 PMN J0948+0022 的行为以及计算出的其射流以质子、电子、辐射和磁场形式产生的功率与耀变体非常相似，特别是平谱射电类星体。这些结果证实了无线电响度窄线 Seyfert 1 星系拥有与普通耀变体功率相似的相对论性喷流的观点。
Following the recent discovery of γ rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to γ rays, which was carried out between the end of 2009 March and the beginning of July. The source displayed activity at all the observed wavelengths: a general decreasing trend from optical to γ-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the γ-ray emission. The largest flux change, about a factor of about 4, occurred in the X-ray band. The smallest was at ultraviolet and near-infrared frequencies, where the rate of the detected photons dropped by a factor 1.6–1.9. At optical wavelengths, where the sampling rate was the highest, it was possible to observe day scale variability, with flux variations up to a factor of about 3. The behavior of PMN J0948+0022 observed in this campaign and the calculated power carried out by its jet in the form of protons, electrons, radiation, and magnetic field are quite similar to that of blazars, specifically of flat-spectrum radio quasars. These results confirm the idea that radio-loud narrow-line Seyfert 1 galaxies host relativistic jets with power similar to that of average blazars.