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THE ALLWISE MOTION SURVEY AND THE QUEST FOR COLD SUBDWARFS

机译:出色的运动调查和对冷浮雕的追求

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The AllWISE processing pipeline has measured motions for all objects detected on Wide-field Infrared Survey Explorer (WISE) images taken between 2010 January and 2011 February. In this paper, we discuss new capabilities made to the software pipeline in order to make motion measurements possible, and we characterize the resulting data products for use by future researchers. Using a stringent set of selection criteria, we find 22,445 objects that have significant AllWISE motions, of which 3525 have motions that can be independently confirmed from earlier Two Micron All Sky Survey (2MASS) images, yet lack any published motions in SIMBAD. Another 58 sources lack 2MASS counterparts and are presented as motion candidates only. Limited spectroscopic follow-up of this list has already revealed eight new L subdwarfs. These may provide the first hints of a "subdwarf gap" at mid-L types that would indicate the break between the stellar and substellar populations at low metallicities (i.e., old ages). Another object in the motion list—WISEA J154045.67–510139.3—is a bright (J ≈ 9 mag) object of type M6; both the spectrophotometric distance and a crude preliminary parallax place it ~6?pc from the Sun. We also compare our list of motion objects to the recently published list of 762 WISE motion objects from Luhman. While these first large motion studies with WISE data have been very successful in revealing previously overlooked nearby dwarfs, both studies missed objects that the other found, demonstrating that many other nearby objects likely await discovery in the AllWISE data products.
机译:AllWISE处理管道已测量了在2010年1月至2011年2月之间拍摄的广域红外勘测浏览器(WISE)图像上检测到的所有对象的运动。在本文中,我们讨论了为使运动测量成为可能而对软件管道进行的新功能,并且我们对所得的数据产品进行了表征,以供将来的研究人员使用。使用严格的选择标准,我们找到了22,445个具有明显AllWISE运动的对象,其中3525个具有可以从早期的两微米全天候测量(2MASS)图像中独立确认的运动,但是在SIMBAD中缺少任何已发布的运动。另有58个来源缺少2MASS同行,仅作为运动候选者出现。该列表的有限光谱跟踪已经揭示了八个新的L亚矮。这些可能会在L型中部提供“亚矮间隙”的初步提示,这表明在低金属含量(即老年)下恒星和亚星际种群之间的断裂。运动列表中的另一个对象(WISEA J154045.67–510139.3)是M6类型的明亮(J≈9 mag)对象。分光光度距离和粗略的初步视差距离太阳约6?pc。我们还将运动对象列表与Luhman最近发布的762个WISE运动对象列表进行了比较。虽然这些使用WISE数据进行的首次大型运动研究非常成功地揭示了先前被忽略的附近小矮人,但两项研究都漏掉了对方发现的物体,这表明在AllWISE数据产品中还有许多其他附近的物体有待发现。
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