SIMBAD references

1999A&A...351L..53H - Astronomy and Astrophysics, volume 351, L53-57 (1999/11-3)

RX J0420.0-5022: an isolated neutron star candidate with evidence for 22.7s X-ray pulsations.


Abstract (from CDS):

We report the discovery of a new isolated neutron star candidate, RX J0420.0-5022, showing evidence (4σ) for 22.7s X-ray pulsations in ROSAT data. NTT observations of the field around the soft X-ray source do not reveal any likely optical counterpart brighter than B = 25.25 implying an X-ray to optical flux ratio of >103.3 and ruling out other possible kinds of X-ray emitters. The X-ray spectrum of RX J0420.0-5022 can be described with blackbody emission with temperature kT of ∼57eV and four ROSAT detections are consistent with no flux variations on time scales of years. The X-ray pulsations, if confirmed, make RX J0420.0-5022 the second long-period isolated neutron star candidate after RX J0720.4-3125. As for this latter source similar conclusions about the magnetic field strength of the neutron star can be drawn depending on evolutionary scenarios.

Abstract Copyright:

Journal keyword(s): stars: individual: RX J0420.0-5022 - stars: neutron - X-rays: stars

Nomenclature: Fig.3, Table 2: [HPM99] A (Nos A-H).

Simbad objects: 15

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