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Infrared and X-ray variability of the transient Anomalous X-ray Pulsar XTE J1810-197 | | N.Rea
; V.Testa
; G.L.Israel
; S.Mereghetti
; R.Perna
; L.Stella
; A.Tiengo
; V.Mangano
; T.Oosterbroek
; R.Mignani
; G.Lo Curto
; S.Campana
; S.Covino
; | | Date: |
4 Aug 2004 | | Subject: | astro-ph | | Affiliation: | Univ.Rome2;INAF-Oar), V.Testa, G.L.Israel (INAF-Oar), S.Mereghetti (IASF, MI), R.Perna (Princeton), L.Stella (INAF-Oar), A.Tiengo (IASF, MI), V.Mangano (IASF, PA), T.Oosterbroek (ESA-Estec), R.Mignani, G.Lo Curto (ESO), S.Campana, S.Covino (INAF-Oab | | Abstract: | We report on observations aimed at searching for flux variations from the proposed IR counterpart of the Anomalous X-ray Pulsar XTE J1810-197. These data, obtained in March 2004 with the adaptive optics camera NAOS-CONICA at the ESO VLT, show that the candidate proposed by Israel et al. (2004) was fainter by Delta H=0.7+/-0.2 and Delta Ks=0.5+/-0.1 with respect to October 2003, confirming it as the IR counterpart of XTE J1810-197. We also report on an XMM-Newton observation carried out the day before the VLT observations. The 0.5-10 keV absorbed flux of the source was 2.2x10^-11 erg/s/cm^2, which is less by a factor of about two compared to the previous XMM-Newton observation on September 2003. Therefore, we conclude that a similar flux decrease took place in the X-ray and IR bands. We briefly discuss these results in the framework of the proposed mechanism(s) responsible for the IR variable emission of Anomalous X-ray Pulsars. | | Source: | arXiv, astro-ph/0408087 | | Services: | Forum | Review | PDF | Favorites | |
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