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SPITZER PHOTOMETRY OF WISE-SELECTED BROWN DWARF AND HYPER-LUMINOUS INFRARED GALAXY CANDIDATES

机译:明智选择的棕色矮人和超高亮度红外银河候选物的微分光度法

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We present Spitzer 3.6 and 4.5?μm photometry and positions for a sample of 1510 brown dwarf candidates identified by the Wide-field Infrared Survey Explorer (WISE) all-sky survey. Of these, 166 have been spectroscopically classified as objects with spectral types M(1), L(7), T(146), and Y(12). Sixteen other objects are non-(sub)stellar in nature. The remainder are most likely distant L and T dwarfs lacking spectroscopic verification, other Y dwarf candidates still awaiting follow-up, and assorted other objects whose Spitzer photometry reveals them to be background sources. We present a catalog of Spitzer photometry for all astrophysical sources identified in these fields and use this catalog to identify seven fainter (4.5?μm?~?17.0?mag) brown dwarf candidates, which are possibly wide-field companions to the original WISE sources. To test this hypothesis, we use a sample of 919 Spitzer observations around WISE-selected high-redshift hyper-luminous infrared galaxy candidates. For this control sample, we find another six brown dwarf candidates, suggesting that the seven companion candidates are not physically associated. In fact, only one of these seven Spitzer brown dwarf candidates has a photometric distance estimate consistent with being a companion to the WISE brown dwarf candidate. Other than this, there is no evidence for any widely separated (20?AU) ultra-cool binaries. As an adjunct to this paper, we make available a source catalog of ~7.33?× 105 objects detected in all of these Spitzer follow-up fields for use by the astronomical community. The complete catalog includes the Spitzer 3.6 and 4.5?μm photometry, along with positionally matched B and R photometry from USNO-B; J, H, and Ks photometry from Two Micron All-Sky Survey; and W1, W2, W3, and W4 photometry from the WISE all-sky catalog.
机译:我们为1510个棕色矮人候选人的样本提供了Spitzer 3.6和4.5?m的光度学和位置,这些样本由广域红外调查浏览器(WISE)全天候调查确定。在这些光谱中,有166种被光谱分类为具有光谱类型M(1),L(7),T(146)和Y(12)的物体。其他十六个天体实际上是非(亚)星体。其余的很可能是远距离的L和T矮星,缺乏光谱学验证,其他的Y矮星候选者仍在等待后续跟踪,还有其他种类的物体,其Spitzer光度法揭示出它们是背景光源。我们提供了针对这些领域中发现的所有天体物理学来源的Spitzer光度学目录,并使用该目录来识别七个微弱(4.5?m?〜?17.0?mag)棕矮星候选物,这些候选物可能是原始WISE光源的广域同伴。为了检验这个假设,我们使用WISE选择的高红移超发光红外星系候选者周围919个Spitzer观测值的样本。对于该对照样品,我们发现了另外六个棕矮星候选人,这表明这七个同伴候选人在身体上没有联系。实际上,这七个Spitzer褐矮星候选者中只有一个具有与WISE褐矮星候选者一致的光度距离估计。除此之外,没有证据表明存在任何广泛分离的(> 20?AU)超冷二进制文件。作为本文的附件,我们提供了在所有这些Spitzer后续领域中检测到的〜7.33?×105个物体的源目录,供天文学界使用。完整的目录包括Spitzer 3.6和4.5?m光度法,以及USNO-B位置匹配的B和R光度法;两微米全天候测量的J,H和Ks光度法;以及WISE全天目录中的W1,W2,W3和W4光度法。
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