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The X‐ray nature of AX J2049.6+2939
Author(s) -
Miyata E.,
Torii K.,
Tsunemi H.
Publication year - 1999
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/1521-3994(199908)320:4/5<337::aid-asna337>3.0.co;2-o
Subject(s) - physics , pulsar , astrophysics , rotation (mathematics) , x ray , loop (graph theory) , astronomy , optics , geometry , mathematics , combinatorics
AX J2049.6+2939 is a compact source in the vicinity of the southern blow‐up region of the Cygnus Loop super‐nova remnant (Miyata 1998). This source is the brightest X‐ray source found during the ASCA survey of the Cygnus Loop. The X‐ray spectrum could be well fitted by a power‐law function with an index of 2.1 ± 0.1. Timing analysis was performed and no coherent pulsation was found. Taking into account the X‐ray properties, we conclude that AX J2049.6+2939 is either an AGN or a spin‐powered pulsar. We again observed AX J2049.6+2939 with ASCA. The GIS count rate was a factor of 40 lower than that of the first ASCA observation. This suggests that AX J2049.6+2939 is not likely to be an ordinary rotation‐powered pulsar. The X‐ray intensity of the third ASCA observation is consistent with that of the second observation. The nature of AX J2049.6+2939 is still unclear and further observation with a wide energy band is strongly required.