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arXiv 1909.07516astro-ph.GA
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VVV-WIT-04:VVV巡天观测到的河外变源

VVV-WIT-04: an extragalactic variable source caught by the VVV Survey

Roberto K. Saito, Dante Minniti, Valentin D. Ivanov, Nicola Masetti, Maria Gabriela Navarro, Roberto Cid Fernandes, Daniel Ruschel-Dutra, Leigh C. Smith, Philip… 展开作者

Roberto K. Saito, Dante Minniti, Valentin D. Ivanov, Nicola Masetti, Maria Gabriela Navarro, Roberto Cid Fernandes, Daniel Ruschel-Dutra, Leigh C. Smith, Philip W. Lucas, Carlos Gonzalez-Fernandez, Rodrigo Contreras Ramos

摘要:

我们报告的VVV-WIT-04的发现,一个近红外可变源对银河系盘位于~0.2角秒,从无线电源PMN J1515-5559的位置。该天体是在Vía Láctea(VVV)的ESO公众调查VISTA Variables的近红外数据中偶然发现的。我们的分析是基于VVV和VVV eXtended调查的变异性,稳定性和自行数据,并辅以较长波长的存档数据。我们认为,VVV-WIT-04作为PMN J1515-5559的近红外对应物具有河外起源。VVV-WIT-04的KS波段光变曲线是高度可变的,并且与光学暴力变(OVV)类星体的光变曲线一致。近红外光谱的变化可以解释为红移的光学变化。对自行的阻力随混合源污染的大小而变化。替代方案,包括一个短暂的事件,如新星或超新星,甚至是一个双微透镜事件是不符合现有的数据。

英文摘要:

We report the discovery of VVV-WIT-04, a near-infrared variable source towards the Galactic disk located ~0.2 arcsec apart from the position of the radio source PMN J1515-5559. The object was found serendipitously in the near-IR data of the ESO public survey VISTA Variables in the Vía Láctea (VVV). Our analysis is based on variability, multicolor, and proper motion data from VVV and VVV eXtended surveys, complemented with archive data at longer wavelengths. We suggest that VVV-WIT-04 has an extragalactic origin as the near-IR counterpart of PMN J1515-5559. The Ks-band light-curve of VVV-WIT-04 is highly variable and consistent with that of an Optically Violent Variable (OVV) quasar. The variability in the near-IR can be interpreted as the redshifted optical variability. Residuals to the proper motion varies with the magnitude suggesting contamination by a blended source. Alternative scenarios, including a transient event such as a nova or supernova, or even a binary microlensing event are not in agreement with the available data.

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