2005A&A...441..513K


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.15CEST05:07:45

2005A&A...441..513K - Astronomy and Astrophysics, volume 441, 513-532 (2005/10-2)

The all-sky distribution of 511 keV electron-positron annihilation emission.

KNOEDLSEDER J., JEAN P., LONJOU V., WEIDENSPOINTNER G., GUESSOUM N., GILLARD W., SKINNER G., VON BALLMOOS P., VEDRENNE G., ROQUES J.-P., SCHANNE S., TEEGARDEN B., SCHOENFELDER V. and WINKLER C.

Abstract (from CDS):

We present a map of 511keV electron-positron annihilation emission, based on data accumulated with the SPI spectrometer aboard ESA's INTEGRAL gamma-ray observatory, that covers approximately ∼95% of the celestial sphere. Within the exposed sky area, 511keV line emission is significantly detected towards the galactic bulge region and, at a very low level, from the galactic disk. The bulge emission is highly symmetric and is centred on the galactic centre with an extension of ∼8° (FWHM). The emission is equally well described by models that represent the stellar bulge or halo populations. The detection significance of the bulge emission is ∼50σ, that of the galactic disk is ∼4σ. The disk morphology is only weakly constrained by the present data, being compatible with both the distribution of young and old stellar populations. The 511keV line flux from the bulge and disk components is (1.05±0.06)x10–3ph/cm2/s and (0.7±0.4)x10–3ph/cm2/s, respectively, corresponding to a bulge-to-disk flux ratio in the range 1-3. Assuming a positronium fraction of fp=0.93 this translates into annihilation rates of (1.5 ±0.1)x1043s–1 and (0.3 ±0.2)x1043s–1, respectively. The ratio of the bulge luminosity to that of the disk is in the range 3-9. We find no evidence for a point-like source in addition to the diffuse emission, down to a typical flux limit of ∼10–4ph/cm2/s. We also find no evidence for the positive latitude enhancement that has been reported from OSSE measurements; our 3σ upper flux limit for this feature is 1.5x10–4ph/cm2/s. The disk emission can be attributed to the β+-decay of the radioactive species 26 Al and 44Ti. The bulge emission arises from a different source which has only a weak or no disk component. We suggest that Type Ia supernovae and/or low-mass X-ray binaries are the prime candidates for the source of the galactic bulge positrons. Light dark matter annihilation could also explain the observed 511keV bulge emission characteristics.

Abstract Copyright:

Journal keyword(s): gamma rays: observations - line: profiles - Galaxy: center

Simbad objects: 51

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Number of rows : 51

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 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1074 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10960 1
3 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 513 0
4 NGC 936 GiP 02 27 37.462 -01 09 22.61   11.1   9.98 10.7 ~ 334 0
5 SN 2003gs SN* 02 27 38.36 -01 09 35.4     14.0     SNIap 48 1
6 LS I +61 303 HXB 02 40 31.6641883136 +61 13 45.591138110 11.27 11.61 10.75 10.19 9.55 B0Ve 762 2
7 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1950 1
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14883 1
9 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4816 1
10 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5614 4
11 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4492 2
12 NAME Gal Anticenter reg 05 46 +28.9           ~ 726 0
13 1A 0620-00 HXB 06 22 44.5420315454 -00 20 44.289428950 10.60 11.40 11.2     K3V-K7V 1043 0
14 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1093 0
15 PSR J0737-3039 Psr 07 37 51.248 -30 39 40.83           ~ 364 1
16 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1375 0
17 NAME Carina Molecular Cloud Complex MoC 10 43 10 -59 38.2           ~ 54 0
18 V* GU Mus HXB 11 26 26.5947467816 -68 40 32.888148788           K3V-K7V 671 1
19 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3387 2
20 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5842 0
21 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5327 1
22 M 94 SyG 12 50 53.148 +41 07 12.55 9.15 8.96 8.24 7.78   ~ 1221 3
23 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1023 0
24 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2709 2
25 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4228 2
26 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4006 3
27 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3012 0
28 V* V822 Cen LXB 14 58 21.9350279092 -31 40 07.515505032 11.95 12.85 12.8     K3-K7V 508 0
29 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1212 1
30 NAME Lupus Loop SNR 15 10.0 -40 00           ~ 60 0
31 V* BR Cir HXB 15 20 40.85 -57 10 00.1   21.4 21.4     ~ 723 1
32 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1527 0
33 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1681 0
34 V* V1101 Sco LXB 17 05 44.4915929414 -36 25 23.049863107   20.10 18.6     ~ 406 0
35 NAME Kepler SNR Rad 17 30 35.976 -21 28 56.23           ~ 713 4
36 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1805 1
37 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 639 1
38 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3477 3
39 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11620 0
40 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504           ~ 614 1
41 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 362 1
42 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1220 0
43 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1750 2
44 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2294 0
45 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3935 0
46 NAME Cyg Complex reg 20 32 +45.0           ~ 520 0
47 NAME MR 2251-178 Sy1 22 54 05.8858021308 -17 34 55.403006841   14.99 14.36 15.12   ~ 378 3
48 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 234 1
49 NAME Cas A SNR 23 23 24.000 +58 48 54.00           ~ 2423 1
50 NAME Galactic Bulge reg ~ ~           ~ 3415 0
51 NAME Vela Field reg ~ ~           ~ 152 0

    Equat.    Gal    SGal    Ecl

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2020.08.15-05:07:45

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