暗能量巡天超新星天区中的类星体选择研究
摘要
我们展示了使用暗能量巡天（DES）超新星天区进行类星体选择的研究。我们利用来自SDSS Stripe 82天区重叠部分的类星体星表，量化了涉及颜色、概率建模、光变以及颜色/概率建模与光变组合的选择方法的完备性和效率。我们仅考虑在DES图像中呈现为点源的天体。我们检验了基于WISE中红外W1-W2颜色、WISE与DES颜色混合（g-i和i-W1）以及VHS与DES颜色混合（g-i和i-K）的颜色选择方法。对于概率类星体选择，我们使用了XDQSOz，这是一种利用经验多波长类星体流量模型来分配类星体概率的算法。我们的光变选择使用了多波段卡方概率，即源在DES第一年griz波段光变曲线中保持恒定的概率。完备性和效率是相对于一个基础点源样本计算的，这些点源在所需的选择波段中被探测到，并通过了我们的数据质量和测光误差筛选。我们在两个星等极限下进行分析：i<19.8 mag和i<22 mag。对于有W1和W2探测的源，W1-W2颜色或XDQSOz方法与光变结合，在两个i波段星等极限下均给出了最高的完备性（>85%），在亮极限下效率>80%，在暗极限下效率>60%；然而，giW1和giW1+光变方法给出了最高的类星体面密度。当同时需要高完备性和高效率时，XDQSOz方法以及W1W2/giW1/XDQSOz与光变的组合是较好的选择方法。我们还提供了OzDES类星体星表，包含由OzDES巡天获取的1,263个光谱证认类星体。该星表包含红移高达z~4且亮于i=22 mag的类星体，尽管该星表在此星等极限下并不完备。
引用
@article{arxiv.1611.05456,
title = {A Study of Quasar Selection in the Dark Energy Survey Supernova fields},
author = {S. S. Tie and P. Martini and D. Mudd and F. Ostrovski and S. L. Reed and C. Lidman and C. Kochanek and T. M. Davis and R. Sharp and S. Uddin and A. King and W. Wester and B. E. Tucker and D. L. Tucker and E. Buckley-Geer and D. Carollo and M. Childress and K. Glazebrook and S. R. Hinton and G. Lewis and E. Macaulay and C. R. O'Neill and T. M. C. Abbott and F. B. Abdalla and J. Annis and A. Benoit-L'evy and E. Bertin and D. Brooks and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and C. E. Cunha and L. N. da Costa and D. L. DePoy and S. Desai and P. Doel and T. F. Eifler and A. E. Evrard and D. A. Finley and B. Flaugher and P. Fosalba and J. Frieman and J. Garcia-Bellido and E. Gaztanaga and D. W. Gerdes and D. A. Goldstein and D. Gruen and R. A. Gruendl and G. Gutierrez and K. Honscheid and D. J. James and K. Kuehn and N. Kuropatkin and M. Lima and M. A. G. Maia and J. L. Marshall and F. Menanteau and C. J. Miller and R. Miquel and R. C. Nichol and B. Nord and R. Ogando and A. A. Plazas and A. K. Romer and E. Sanchez and B. Santiago and V. Scarpine and M. Schubnell and I. Sevilla-Noarbe and R. C. Smith and M. Soares-Santos and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and D. Thomas and A. R. Walker and The DES Collaboration},
journal= {arXiv preprint arXiv:1611.05456},
year = {2017}
}
备注
16 pages, 12 figures, 3 tables; Submitted to ApJ. The OzDES Quasar Catalog can be downloaded at http://bit.ly/2fWsK9t . For a video summary of the paper, please see https://www.youtube.com/watch?v=JeQNdUATze0