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arXiv 2302.05595astro-ph.GA
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VVV近红外星系目录中的AGN候选者

AGN candidates in the VVV near-IR galaxy catalogue

Laura D. Baravalle, Eduardo O. Schmidt, M. Victoria Alonso, Ana Pichel, Dante Minniti, Adriana R. Rodríguez-Kamenetzky, Nicola Masetti, Carolina Villalon, Leigh… 展开作者

Laura D. Baravalle, Eduardo O. Schmidt, M. Victoria Alonso, Ana Pichel, Dante Minniti, Adriana R. Rodríguez-Kamenetzky, Nicola Masetti, Carolina Villalon, Leigh C. Smith, Philip W. Lucas

摘要:

这项工作的目标是用|b| $<$ 2 $^\circ$在极低纬度的银盘中寻找活动星系核(AGN)。为此,我们研究了VVV近红外星系目录中的五个来源,这些来源也有WISE对应物,并在VVACVC可变分类目录(VIVACE)中呈现可变性。在近红外色-色图中,这些物体与该领域的其他光源相比通常具有更红的颜色。在中红外波段,它们位于活动星系核区域,但有一个源呈现出最高的星际消光和不同的中红外颜色,是一个年轻的恒星物体(YSO)。我们还使用两种不同的统计方法研究了源的变异性。分数变异幅度$σ_{rms}$的范围从12.6到33.8,与以前的结果一致的1型活动星系核。光变曲线的斜率在(2.6 $-$ 4.7)$\times 10^{-4}$ mag/天的范围内,也与类星体变化的结果一致。所有这些结果的组合表明,四个星系是1型活动星系核的候选者,而第五个源可能是YSO候选者。

英文摘要:

The goal of this work is to search for Active Galactic Nuclei (AGN) in the Galactic disc at very low latitudes with |b| $<$ 2$^\circ$. For this, we studied the five sources from the VVV near-infrared galaxy catalogue that have also WISE counterparts and present variability in the VIrac VAriable Classification Ensemble (VIVACE) catalogue. In the near-infrared colour-colour diagrams, these objects have in general redder colours compared to the rest of the sources in the field. In the mid-infrared ones, they are located in the AGN region, however there is a source that presents the highest interstellar extinction and different mid-IR colours to be a young stellar object (YSO). We also studied the source variability using two different statistical methods. The fractional variability amplitude $σ_{rms}$ ranges from 12.6 to 33.8, being in concordance with previous results found for type-1 AGNs. The slopes of the light curves are in the range (2.6$-$4.7) $\times 10^{-4}$ mag/day, also in agreement with results reported on quasars variability. The combination of all these results suggest that four galaxies are type-1 AGN candidates whereas the fifth source likely a YSO candidate.

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