THE MAGELLANIC QUASARS SURVEY. II. CONFIRMATION OF 144 NEW ACTIVE GALACTIC NUCLEI BEHIND THE SOUTHERN EDGE OF THE LARGE MAGELLANIC CLOUD
THE MAGELLANIC QUASARS SURVEY. II. CONFIRMATION OF 144 NEW ACTIVE GALACTIC NUCLEI BEHIND THE SOUTHERN EDGE OF THE LARGE MAGELLANIC CLOUD
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DOI：
10.1088/0004-637x/746/1/27
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发表时间：
2011-06
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通讯作者：
S. Kozłowski;C. Kochanek;A. Jacyszyn;A. Udalski;M. Szymański;R. Poleski;M. Kubiak;I. Soszyński;G. Pietrzyński;Ł. Wyrzykowski;K. Ulaczyk;P. Pietrukowicz
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作者：
S. Kozłowski;C. Kochanek;A. Jacyszyn;A. Udalski;M. Szymański;R. Poleski;M. Kubiak;I. Soszyński;G. Pietrzyński;Ł. Wyrzykowski;K. Ulaczyk;P. Pietrukowicz
我们将大麦哲伦星云（LMC）背后已知的类星体数量从56个（光学引力透镜实验(OGLE)-III LMC场中的42个）增加到200个，通过光谱确认了在LMC中心以南4 ~ 3 deg2英澳望远镜/AAOmega场中观测到的845个候选样本中的169个（144个新）类星体。候选天体是根据它们的斯皮策中红外颜色、x射线发射和/或OGLE微透镜调查数据库中的光学变异性来选择的。污染源可分为115个年轻恒星天体（YSO）， 17个行星状星云（PNe）， 39个be和24个蓝色恒星，68个红色恒星，以及12个被归类为YSO/PN或蓝星/YSO的天体。还有402个目标要么没有特征光谱，要么信噪比太低，无法进行源分类。我们的类星体样本在I = 18.6等（19.3等）处完成了50%（30%）。新发现的活动星系核（agn）为LMC的适当运动研究提供了许多额外的参考点，样品包括10个明亮的agn （I < 18等），可能适合于吸收线研究。然而，它们的主要用途是对类星体变异性的详细研究，因为它们都有长期的、高节奏的、不断增长的光曲线，这些光曲线是从LMC的微透镜调查中得到的。在大麦哲伦星云和小麦哲伦星云中完成现有的麦哲伦类星体调查领域，应该会产生~ 700个监测良好的agn样本，并将其扩展到OGLE-IV调查覆盖的更大区域，应该会产生~ 3600个agn样本。
We quadruple the number of quasars known behind the Large Magellanic Cloud (LMC) from 56 (42 in the Optical Gravitational Lensing Experiment (OGLE)-III LMC fields) to 200 by spectroscopically confirming 169 (144 new) quasars from a sample of 845 observed candidates in four ∼3 deg2 Anglo-Australian Telescope/AAOmega fields south of the LMC center. The candidates were selected based on their Spitzer mid-infrared colors, X-ray emission, and/or optical variability properties in the database of the OGLE microlensing survey. The contaminating sources can be divided into 115 young stellar objects (YSOs), 17 planetary nebulae (PNe), 39 Be and 24 blue stars, 68 red stars, and 12 objects classed as either YSO/PN or blue star/YSO. There are also 402 targets with either featureless spectra or too low signal-to-noise ratios for source classification. Our quasar sample is 50% (30%) complete at I = 18.6 mag (19.3 mag). The newly discovered active galactic nuclei (AGNs) provide many additional reference points for proper motion studies of the LMC, and the sample includes 10 bright AGNs (I < 18 mag) that are potentially suitable for absorption line studies. Their primary use, however, is for detailed studies of quasar variability, as they all have long-term, high cadence, continuously growing light curves from the microlensing surveys of the LMC. Completing the existing Magellanic Quasars Survey fields in the LMC and Small Magellanic Cloud should yield a sample of ∼700 well-monitored AGNs, and expanding it to the larger regions covered by the OGLE-IV survey should yield a sample of ∼3600 AGNs.