2009A&A...504..185P


Query : 2009A&A...504..185P

2009A&A...504..185P - Astronomy and Astrophysics, volume 504, 185-197 (2009/9-2)

A search for thermally emitting isolated neutron stars in the 2XMMp catalogue.

PIRES A.M., MOTCH C. and JANOT-PACHECO E.

Abstract (from CDS):

The relatively large number of nearby radio-quiet and thermally emitting isolated neutron stars (INSs) discovered in the ROSAT All-Sky Survey, dubbed the ``Magnificent Seven'', suggests that they belong to a formerly neglected major component of the overall INS population. So far, attempts to discover similar INSs beyond the solar vicinity failed to confirm any reliable candidate. The good positional accuracy and soft X-ray sensitivity of the EPIC cameras onboard the XMM-Newton satellite allow us to efficiently search for new thermally emitting INSs. We used the 2XMMp catalogue to select sources with no catalogued candidate counterparts and with X-ray spectra similar to those of the Magnificent Seven, but seen at greater distances and thus undergoing higher interstellar absorptions. Identifications in more than 170 astronomical catalogues and visual screening allowed us to select fewer than 30 good INS candidates. In order to rule out alternative identifications, we obtained deep ESO-VLT and SOAR optical imaging for the X-ray brightest candidates. We report here on the optical follow-up results of our search and discuss the possible nature of 8 of our candidates. A high X-ray-to-optical flux ratio together with a stable flux and soft X-ray spectrum make the brightest source of our sample, 2XMM J104608.7-594306, a newly discovered thermally emitting INS. The X-ray source 2XMM J010642.3+005032 has no evident optical counterpart and should be further investigated. The remaining X-ray sources are most probably identified with cataclysmic variables and active galactic nuclei, as inferred from the colours and flux ratios of their likely optical counterparts. Beyond the finding of new thermally emitting INSs, our study aims at constraining the space density of this Galactic population at great distances and at determining whether their apparently high density is a local anomaly or not.

Abstract Copyright:

Journal keyword(s): stars: neutron - X-rays: individual: 2XMM J104608.7-594306 - catalogs

Simbad objects: 41

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Number of rows : 41
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12095 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10530 1
3 2XMM J010642.3+005032 N*? 01 06 42.40 +00 50 31.3           ~ 1 0
4 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5602 1
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6555 1
6 2XMM J031459.9-291816 N*? 03 14 59.90 -29 18 15.5           ~ 1 0
7 2XMM J043553.2-102649 N*? 04 35 53.20 -10 26 50.0           ~ 1 0
8 RX J0720.4-3125 N* 07 20 24.961 -31 25 50.21   26.1   27.0   ~ 294 0
9 RL 149 HS* 07 24 14.3741784768 -00 33 04.165016904 12.958 13.737 13.866 13.906 13.974 sdB 111 0
10 NAME Puppis reg 07 40 -28.0           ~ 87 0
11 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 257 0
12 HD 93162 WR* 10 44 10.3890266112 -59 43 11.106500520 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 349 1
13 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 975 2
14 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2363 0
15 CXOGNC J104608.71-594306.4 N*? 10 46 08.719 -59 43 06.48           ~ 19 0
16 V* UY Sex HS* 10 50 02.8265487864 -00 00 36.879009588 12.063 13.184 13.474 13.606 13.769 sdO9VIIHe6 156 0
17 2XMM J121017.0-464609 N*? 12 10 17.10 -46 46 11.2           ~ 1 0
18 SA 104- reg 12 42 21.0 -00 32 29           ~ 58 0
19 2XMM J125045.7-233349 N*? 12 50 45.70 -23 33 47.7           ~ 1 0
20 2XMM J125904.5-040503 N*? 12 59 04.60 -04 05 02.3           ~ 1 0
21 RX J1308.8+2127 N*? 13 08 48.7 +21 27 08   28.6 28.6     ~ 152 1
22 PG 1323-086 HS* 13 25 39.4669501176 -08 49 19.067387484 12.660 13.341 13.481 13.529 13.608 sdB3IHe8 138 1
23 2E 3049 X 13 26 19.796 -47 29 10.51   26.8   25.3   ~ 20 0
24 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3299 0
25 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4159 4
26 RX J1412.9+7922 X 14 12 55.885 +79 22 04.10           ~ 35 0
27 ESO 134-11 HII 14 40 29 -62 38.7           ~ 551 1
28 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1297 1
29 SNR G320.4-01.0 SNR 15 13 35 -59 00.2           ~ 83 0
30 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2130 0
31 2XMM J164143.6+362758 LXB 16 41 43.761 +36 27 57.84           ~ 6 0
32 PSR B1719-37 Psr 17 22 59.2390 -37 12 03.700           ~ 92 0
33 [L92b] Mark A HS* 20 43 59.2253596272 -10 47 41.696051820 11.854 13.010 13.256 13.370 13.494 sdO 68 1
34 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 883 0
35 Ass Cyg OB 7 As* 21 08 +47.6           ~ 207 0
36 2XMM J214026.1-233222 N*? 21 40 26.20 -23 32 22.3           ~ 1 0
37 RX J2143.0+0654 N*? 21 43 03.8 +06 54 20           ~ 75 0
38 Ass Cep OB 2 As* 21 51 +60.0           ~ 285 0
39 NAME Carina Moving Group MGr ~ ~           ~ 42 0
40 NAME Magnificent Seven ? ~ ~           ~ 67 1
41 NAME Gould Belt PoG ~ ~           ~ 832 1

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2023.01.28-14:32:33

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