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http://hdl.handle.net/20.500.12386/28243
Title: | VLT observations of the magnetar CXO J164710.2-455216 and the detection of a candidate infrared counterpart | Authors: | TESTA, Vincenzo MIGNANI, Roberto Hummel, W. Rea, N. ISRAEL, Gian Luca |
Issue Date: | 2018 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 473 | Issue: | 3 | First Page: | 3180 | Abstract: | We present deep observations of the field of the magnetar CXO J164710.2-455216 in the star cluster Westerlund 1, obtained in the near-infrared with the adaptive optics camera NACO@VLT. We detected a possible candidate counterpart at the Chandra position of the magnetar, of magnitudes J = 23.5 ± 0.2, H = 21.0 ± 0.1 and K<SUB>S</SUB> = 20.4 ± 0.1. The K<SUB>S</SUB>-band measurements available for two epochs (2006 and 2013) do not show significant signs of variability but only a marginal indication that the flux varied (at the 2σ level), consistent with the fact that the observations were taken when CXO J164710.2-455216 was in quiescence. At the same time, we also present colour-magnitude and colour-colour diagrams in the J, H and K<SUB>S</SUB> bands from the 2006 epoch only, the only one with observations in all three bands, showing that the candidate counterpart lies in the main bulk of objects describing a relatively well-defined sequence. Therefore, based on its colours and lack of variability, we cannot yet associate the candidate counterpart to CXO J164710.2-455216. Future near-infrared observations of the field, following up a source outburst, would be crucial to confirm the association with the detection of near-infrared variability and colour evolution. | Acknowledgments: | European Organization for Astronomical Research in the Southern hemisphere under ESO programme 091.D-0071(B);Occhialini Fellowship | URI: | http://hdl.handle.net/20.500.12386/28243 | URL: | https://academic.oup.com/mnras/article/473/3/3180/4331648 https://arxiv.org/abs/1708.02233 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx2574 | Bibcode ADS: | 2018MNRAS.473.3180T | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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1708.02233.pdf | postprint | 506.33 kB | Adobe PDF | View/Open |
stx2574.pdf | Pdf editoriale | 653.95 kB | Adobe PDF | View/Open |
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