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|Title:||The nature of the infrared counterpart and of the optical nebula associated with the Central Compact Object in Vela Jr||Authors:||Mignani, R. P.
DE LUCA, Andrea
PELLIZZONI, ALBERTO PAOLO
|Issue Date:||2019||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||486||Issue:||4||First Page:||5716||Abstract:||The X-ray source CXO J085201.4-461753 in the few kyr-old Vela Jr. supernova remnant (SNR, G266.2-1.2) belongs to the peculiar class of isolated neutron stars dubbed `Central Compact Objects' (CCOs). At variance with the other CCOs, which are only detected in the X-rays, CXO J085201.4-461753 has been possibly detected also at other wavelengths. In particular, a candidate near-infrared counterpart (H = 21.6 ± 0.1) was detected by the Very Large Telescope (VLT) in addition to a 6 arcsec-wide nebula detected in Hα, interpreted as a velocity-driven bow shock. Here, we present new near-infrared and optical VLT observations of the candidate counterpart to CXO J085201.4-461753 and its nebula to confirm the proposed associations. Moreover, we used archival Chandra observations to measure for the first time the CXO J085201.4-461753 proper motion. The comparison between the two sets of near-infrared VLT images, taken 10.56 yr apart, do not show evidence of proper motion for the candidate counterpart to CXO J085201.4-461753, expected from its 4 arcmin offset from the SNR geometrical centre, with a 3σ upper limit of ∼10 mas yr<SUP>-1</SUP>. This is much smaller than the expected proper motion of ∼50-100 mas yr<SUP>-1</SUP>, which, in turn, is below the 3σ upper limit of ∼300 mas yr<SUP>-1</SUP> that we obtained with Chandra. At the same time, VLT spectroscopy resolved the nebula optical emission, which is dominated by the N II doublet at 6548 and 6584 Å and not by Hα. To summarize, we conclude that the proposed near-infrared counterpart is likely unassociated with CXO J085201.4-461753 and that the nebula is not a velocity-driven bow shock.||URI:||http://hdl.handle.net/20.500.12386/29165||URL:||https://academic.oup.com/mnras/article-abstract/486/4/5716/5484906?redirectedFrom=fulltext||ISSN:||0035-8711||DOI:||10.1093/mnras/stz1195||Bibcode ADS:||2019MNRAS.486.5716M||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Jan 22, 2021
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