2009A&A...497..423M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:46:47

2009A&A...497..423M - Astronomy and Astrophysics, volume 497, 423-435 (2009/4-2)

Proper motions of thermally emitting isolated neutron stars measured with Chandra.

MOTCH C., PIRES A.M., HABERL F., SCHWOPE A. and ZAVLIN V.E.

Abstract (from CDS):

The remarkable astrometric capabilities of the Chandra Observatory offer the possibility to measure proper motions of X-ray sources with an unprecedented accuracy in this wavelength range. We recently completed a proper motion survey of three of the seven thermally emitting radio-quiet isolated neutron stars (INSs) discovered in the ROSAT all-sky survey. These INSs (RXJ0420.0-5022, RXJ0806.4-4123 and RXJ1308.6+2127) either lack an optical counterpart or have one so faint that ground based or space born optical observations push the current possibilities of the instrumentation to the limit. Pairs of ACIS observations were acquired 3 to 5 years apart to measure the displacement of the sources on the X-ray sky using as a reference the background of extragalactic or remote Galactic X-ray sources. We derive 2σ upper limits of 123masyr and 86mas/yr on the proper motion of RXJ0420.0-5022 and RXJ0806.4-4123, respectively. RXJ1308.6+2127 exhibits a very significant displacement (∼9σ) yielding µ=220±25mas/yr, the second fastest measured among all ROSAT-discovered INSs. The source is probably moving away rapidly from the Galactic plane at a speed which precludes any significant accretion of matter from the interstellar medium. Its transverse velocity of ∼740(d/700pc)km/s might be the largest of all ROSAT INSs and its corresponding spatial velocity lies among the fastest recorded for neutron stars. RXJ1308.6+2127 is thus a middle-aged (age ∼1My) high velocity cooling neutron star. We investigate its possible origin in nearby OB associations or from a field OB star. In most cases, the flight time from birth place appears significantly shorter than the characteristic age derived from spin down rate. Overall, the distribution in transverse velocity of the ROSAT INSs is not statistically different from that of normal radio pulsars.

Abstract Copyright:

Journal keyword(s): stars: neutron - X-rays: stars

Simbad objects: 33

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Number of rows : 33

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2C 94 Sy2 01 08 52.8701245540 +13 20 14.257796477   15.19       ~ 440 2
2 NAME Cetus Field reg 02 05 20 -04 55.0           ~ 25 0
3 QSO J0311-7651 BLL 03 11 55.2500768688 -76 51 50.846014733 15.27 16.09 16.10 15.33   ~ 208 1
4 4C 05.19 QSO 04 14 37.76781859 +05 34 42.3354282   24.100 23.800 21.270   ~ 330 2
5 RX J0420.0-5022 N*? 04 20 02.2 -50 22 46     25.5     ~ 79 0
6 RX J0720.4-3125 N* 07 20 24.961 -31 25 50.21   26.1   27.0   ~ 281 0
7 RX J0806.4-4123 N*? 08 06 23.0 -41 22 33           ~ 70 0
8 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 211 0
9 NAME Pup A SNR 08 24 07 -42 59.8           ~ 517 1
10 Cl Trumpler 10 OpC 08 47 54 -42 27.0           ~ 145 0
11 NGC 3561 LIN 11 11 13.2 +28 41 47   14.7       ~ 192 2
12 RX J1308.8+2127 N*? 13 08 48.7 +21 27 08   28.6 28.6     ~ 144 1
13 PSR B1508+55 Psr 15 09 25.7 +55 31 33           ~ 267 1
14 7C 154914.09+625020.00 QSO 15 49 59.2 +62 41 18   21.92 20.70     ~ 131 2
15 RX J1605.3+3249 N*? 16 05 18.9 +32 49 07     26.8     ~ 89 1
16 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
17 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1120 1
18 Ass Sgr OB 5 As* 17 50 -29.6           ~ 20 0
19 Ass Sgr OB 1 As* 18 06 -22.8           ~ 113 0
20 Ass Sgr OB 6 As* 18 12 -16.0           ~ 15 0
21 Ass Sgr OB 7 As* 18 14.9 -20 24           ~ 36 0
22 Ass Sgr OB 4 As* 18 16 -18.9           ~ 24 0
23 Ass Ser OB 2 As* 18 18 -12.3           ~ 58 0
24 Ass Ser OB 1 As* 18 21 -14.4           ~ 72 0
25 Ass Sct OB 3 As* 18 25 27.2 -14 15 04           ~ 33 0
26 Ass Sct OB 2 As* 18 35 -08.9           ~ 37 0
27 RX J1856.6-3754 N* 18 56 35.11 -37 54 30.5     25.7     ~ 388 0
28 GBS 1900+14 gB 19 07 13 +09 19.6           ~ 779 0
29 RX J2143.0+0654 N*? 21 43 03.8 +06 54 20           ~ 71 0
30 PSR B2223+65 Psr 22 25 52.36 +65 35 33.8           ~ 287 0
31 2E 4673 HXB 23 01 08.14 +58 52 44.5           ~ 585 1
32 NAME Gould Belt PoG ~ ~           ~ 711 1
33 NAME Magnificent Seven ? ~ ~           ~ 57 1

    Equat.    Gal    SGal    Ecl

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2020.07.13-23:46:47

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