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| Query : 1999A&A...351L..53H |
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.
HABERL F., PIETSCH W. and MOTCH C.
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
| Number of rows : 15 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | ESO 202-8 | G | 04 19 59.3846047080 | -50 22 00.951344796 | 16.50 | 14.75 | ~ | 12 | 0 | |||
| 2 | RX J0420.0-5022 | N* | 04 20 02.2 | -50 22 46 | 25.5 | ~ | 93 | 0 | ||||
| 3 | RX J0720.4-3125 | N* | 07 20 24.961 | -31 25 50.21 | 26.1 | 27.0 | ~ | 303 | 0 | |||
| 4 | RX J0806.4-4123 | N* | 08 06 23.0 | -41 22 33 | ~ | 80 | 0 | |||||
| 5 | RBS 1223 | N* | 13 08 48.7 | +21 27 08 | 28.6 | 28.6 | ~ | 157 | 1 | |||
| 6 | RBS 1556 | N* | 16 05 18.9 | +32 49 07 | 26.8 | ~ | 101 | 1 | ||||
| 7 | RX J1856.6-3754 | Psr | 18 56 35.11 | -37 54 30.5 | 25.7 | ~ | 437 | 0 | ||||
| 8 | [HPM99] A | ? | ~ | ~ | 24.44 | ~ | 3 | 0 | ||||
| 9 | [HPM99] H | ? | ~ | ~ | 26.50 | ~ | 3 | 0 | ||||
| 10 | [HPM99] B | ? | ~ | ~ | 24.54 | ~ | 2 | 0 | ||||
| 11 | [HPM99] C | ? | ~ | ~ | ~ | 1 | 0 | |||||
| 12 | [HPM99] D | ? | ~ | ~ | 25.03 | ~ | 3 | 0 | ||||
| 13 | [HPM99] E | ? | ~ | ~ | 25.25 | ~ | 3 | 0 | ||||
| 14 | [HPM99] F | ? | ~ | ~ | ~ | 2 | 0 | |||||
| 15 | [HPM99] G | ? | ~ | ~ | 25.39 | ~ | 2 | 0 |
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