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arXiv 2309.03434astro-ph.CO
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Dark Energy Spectroscopic Instrument Early Data Release中的宽吸收线类星体

Broad Absorption Line Quasars in the Dark Energy Spectroscopic Instrument Early Data Release

S. Filbert, P. Martini, K. Seebaluck, L. Ennesser, D. M. Alexander, A. Bault, A. Brodzeller, H. K. Herrera-Alcantar, P. Montero-Camacho, I. Pérez-Ràfols, C. Ram… 展开作者

S. Filbert, P. Martini, K. Seebaluck, L. Ennesser, D. M. Alexander, A. Bault, A. Brodzeller, H. K. Herrera-Alcantar, P. Montero-Camacho, I. Pérez-Ràfols, C. Ramírez-Pérez, C. Ravoux, T. Tan, J. Aguilar, S. Ahlen, S. Bailey, D. Brooks, T. Claybaugh, K. Dawson, A. de la Macorra, P. Doel, K. Fanning, A. Font-Ribera, J. E. Forero-Romero, S. Gontcho A Gontcho, J. Guy, D. Kirkby, A. Kremin, C. Magneville, M. Manera, A. Meisner, R. Miquel, J. Moustakas, J. Nie, W. J. Percival, F. Prada, M. Rezaie, G. Rossi, E. Sanchez, M. Schubnell, H. Seo, G. Tarlé, B. A. Weaver, Z. Zhou

AI总结:

本文提出了DESI巡天Early Data Release中的BAL类星体目录,介绍了自动识别方法,通过掩蔽BAL特征重新计算红移(平均小243 km/s),提升了类星体成团性测量精度,并展示了DESI识别罕见BAL类别的潜力。

摘要:

宽吸收线(BAL)类星体的特征是存在气体云,这些气体云会在常见类星体光谱特征的波长处吸收流量,尽管这些吸收特征会蓝移,且蓝移速度可超过0.1c。BAL特征作为显著反馈的标志而备受关注,但它们也会通过扭曲最显著的类星体发射线形状,影响红移精度以及由Lyman-alpha森林示踪的物质密度分布测量,从而损害利用类星体进行的宇宙学研究。我们提出了一个在Dark Energy Spectroscopic Instrument(DESI)巡天Early Data Release中发现的BAL类星体目录,这些类星体是作为DESI Survey Validation的一部分以及主巡天的头两个月进行观测的。我们描述了在DESI数据中自动识别BAL类星体的方法、为每个BAL测量的物理量,并利用模拟DESI观测研究了该方法的完整性和纯度。我们掩蔽了BAL特征的波长并重新评估了每个BAL类星体的红移,发现BAL类星体样本的新红移平均小了243 km/s。这些更准确的新红移对于获得类星体成团性的最佳测量结果至关重要,尤其是在小尺度上。最后,我们展示了一些较罕见BAL类别的光谱,说明了DESI数据在识别此类群体以供进一步研究方面的潜力。

英文摘要:

Broad absorption line (BAL) quasars are characterized by gas clouds that absorb flux at the wavelength of common quasar spectral features, although blueshifted by velocities that can exceed 0.1c. BAL features are interesting as signatures of significant feedback, yet they can also compromise cosmological studies with quasars by distorting the shape of the most prominent quasar emission lines, impacting redshift accuracy and measurements of the matter density distribution traced by the Lyman-alpha forest. We present a catalog of BAL quasars discovered in the Dark Energy Spectroscopic Instrument (DESI) survey Early Data Release, which were observed as part of DESI Survey Validation, as well as the first two months of the main survey. We describe our method to automatically identify BAL quasars in DESI data, the quantities we measure for each BAL, and investigate the completeness and purity of this method with mock DESI observations. We mask the wavelengths of the BAL features and re-evaluate each BAL quasar redshift, finding new redshifts which are 243 km/s smaller on average for the BAL quasar sample. These new, more accurate redshifts are important to obtain the best measurements of quasar clustering, especially at small scales. Finally, we present some spectra of rarer classes of BALs that illustrate the potential of DESI data to identify such populations for further study.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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