Query : 2018A&A...612A..87M

2018A&A...612A..87M - Astronomy and Astrophysics, volume 612A, 87-87 (2018/4-1)

Probing the nature of AX J0043-737: Not an 87 ms pulsar in the Small Magellanic Cloud.


Abstract (from CDS):

Aims. AX J0043-737 is a source in the ASCA catalogue whose nature is uncertain. It is most commonly classified as a Crab-like pulsar in the Small Magellanic Cloud (SMC) following apparent detection of pulsations at ∼87ms from a single ASCA observation. A follow-up ASCA observation was not able to confirm this, and the X-ray detection of the source has not been reported since.
Methods. We studied the nature of the source with a dedicated XMM-Newton observation. We ascertained the source position, searched for the most probable counterpart, and studied the X-ray spectrum. We also analysed other archival observations with the source in the field of view to study its long-term variability.
Results. With the good position localisation capability of XMM-Newton, we identify the counterpart of the source as MQS J004241.66-734041.3, an active galactic nucleus (AGN) behind the SMC at a redshift of 0.95. The X-ray spectrum can be fitted with an absorbed power law with a photon-index of Γ=1.7, which is consistent with that expected from AGNs. By comparing the current XMM-Newton observation with an archival XMM-Newton and two other ASCA observations of the source, we find signatures of long-term variability, another common phenomenon in AGNs. All of the above are consistent with AX J0043-737 being an AGN behind the SMC.

Abstract Copyright: © ESO 2018

Journal keyword(s): Magellanic Clouds - quasars: general - X-rays: galaxies - pulsars: individual: AX J0043-737

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 XMMU J004208.0-734502 HXB 00 42 07.769 -73 45 03.44           ~ 9 1
2 AX J0043-737 X 00 42 39.9 -73 40 25           ~ 14 0
3 OGLE SMC128.4 5190 AGN 00 42 41.660 -73 40 41.30     20.18   19.91 ~ 3 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10361 1
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6408 1
6 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4135 0

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