A search for the hidden population of AM CVn binaries in the Sloan Digital Sky Survey
A search for the hidden population of AM CVn binaries in the Sloan Digital Sky Survey
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DOI：
10.1093/mnras/sts485
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发表时间：
2012-11
影响因子：
4.8
通讯作者：
P. Carter;T. Marsh;D. Steeghs;P. J. Groot;G. Nelemans;G. Nelemans;D. Levitan;A. Rau;C. Copperwheat;T. Kupfer;G. Roelofs
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文献类型：
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作者：
P. Carter;T. Marsh;D. Steeghs;P. J. Groot;G. Nelemans;G. Nelemans;D. Levitan;A. Rau;C. Copperwheat;T. Kupfer;G. Roelofs
我们提出了最新的光谱调查的结果，旨在揭示隐藏的人口AM犬Venaticorum（AM CVn）二进制的光度数据库的斯隆数字巡天（SDSS）。我们根据它们的光度颜色选择了2000个候选者，这是一个相对较小的样本，预计包含SDSS中所有AM CVn双星的大部分（预计为2000）。我们提出了两个新的候选人AM CVn二进制文件发现使用这种策略：SDSS J104325.08+563258.1和SDSS J173047.59+554518.5。我们还给出了本次巡天发现的29颗新激变变星、23颗DQ白色矮星和21颗DZ白色矮星的光谱。调查现在大约完成了70%，发现了7个新的AM CVn双星，表明空间密度比以前预测的要低。从基本上完全g ≤ 19的样本中，我们得到观测到的空间密度为（5 ± 3）× 10^（−7）pc^（−3）;这比以前的估计低了3倍。该样本已与GALEX全天成像巡天数据库和联合王国红外望远镜红外深空巡天第9期数据进行了交叉比对。UV光度法的加入允许应用新的颜色切割，将我们的样品大小减少到1000个物体。优化我们的后续行动应该使我们能够发现SDSS中存在的剩余AM CVn双星，提供更可靠地估计其空间密度所需的更大均匀样本。
We present the latest results from a spectroscopic survey designed to uncover the hidden population of AM Canum Venaticorum (AM CVn) binaries in the photometric data base of the Sloan Digital Sky Survey (SDSS). We selected ∼2000 candidates based on their photometric colours, a relatively small sample which is expected to contain the majority of all AM CVn binaries in the SDSS (expected to be ∼50). We present two new candidate AM CVn binaries discovered using this strategy: SDSS J104325.08+563258.1 and SDSS J173047.59+554518.5. We also present spectra of 29 new cataclysmic variables, 23 DQ white dwarfs and 21 DZ white dwarfs discovered in this survey. The survey is now approximately 70 per cent complete, and the discovery of seven new AM CVn binaries indicates a lower space density than previously predicted. From the essentially complete g ≤ 19 sample, we derive an observed space density of (5 ± 3) × 10^(−7) pc^(−3); this is lower than previous estimates by a factor of 3. The sample has been cross-matched with the GALEX All-Sky Imaging Survey data base, and with Data Release 9 of the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS). The addition of UV photometry allows new colour cuts to be applied, reducing the size of our sample to ∼1100 objects. Optimizing our follow-up should allow us to uncover the remaining AM CVn binaries present in the SDSS, providing the larger homogeneous sample required to more reliably estimate their space density.