List of cyclotron line sources

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This table attempts to summarize all known cyclotron line sources. It is based on the presentation "Spectral continua of accreting neutron star systems" by Jörn Wilms at the conference Astrophysics of Neutron Stars 2010 with some information added later.

T/P = Transient/Persistent

Source Ecyc [keV] Pspin [s] Porbital [d] Companion T/P Discovery Other ref
Swift J1626.6-5156 4.9, 8.4, 12.6, 16.9 [1] 15.4 132.9 Be P Swift/BAT [2] [3], [4]
4U 0115+634 14, 24, 36, 48, 62 3.6 24.3 Be T HEAO-1 [5] RXTE [6], BeppoSAX [7]
4U 1907+09 18, 38 441 8.37 B2 III-IV P BeppoSAX [8]
4U 1538-52 22, 47 530 3.7 B0I P Ginga [9], RXTE [10]
Vela X-1 24, 52 283 8.96 B0.5Ib P Mir-HEXE [11], RXTE [12]
V 0332+53 27, 51, 74 4.37 34.25 Be T Ginga [13]
Cep X-4 28 66.25 >23 B1 T Ginga [14]
Cen X-3 29 4.8 2.09 O6.5II P BeppoSAX [15], RXTE [16]
X Per 29? 837 250.3 B0 III–Ve P RXTE [17]
RX J0440.9+4431 32 203 155 B0.2 Ve T INTEGRAL, RXTE + Swift [18]
MXB 0656-072 33 160 100? O9.7Ve T RXTE [19]
XTE J1946+274 36 15.8 169.2 B0-1V-IVe T RXTE [20]
4U 1626-67 37 7.66 0.028 WD? P BeppoSAX [21], RXTE [16]
GX 301-2 37 690 41.5 B1.2Ia P Ginga [22]
Her X-1 41 1.24 1.7 A9-B P Ballon-HEXE [23]
A0535+26 45, 100+ 104 110.6 Be T HEXE [11][24], CGRO [25]
1A1118-616 55, 110? 408 400-800? O9.5IV-Ve T RXTE [26], Suzaku [27]
GRO J1008-57 88? 93.7 249.46 B1-B2 T CGRO [28]
GX 304-1 54 272 132.2 B2 Vne P RXTE [29], INTEGRAL [30]
KS 1947+300 12 18.8 40.4 B0Ve T NuSTAR [31]

Location in the Galaxy

The figure below displays the position of the sources listed above in the Galaxy as far as known at this moment. Click on the figure for a larger version. Labels indicate the ordinal number in the first column of the table. Uncertainties in the distances are not indicated. Empty symbols represent sources for which there is no distance info in the literature; they have been artificially set to a distance of 7.6 kpc. The spiral arms are from [32]. Figure and data provided by Arash Bodaghee, SSL, UC Berkeley.

# Source Dist. [kpc] Reference
Cyclotronlinesourcesinthegalaxy.png 1 Swift J1626.6-5156 8±2.4 [33]
2 4U 0115+634 8±1 [34]
3 4U 1907+09 5 [35]
4 4U 1538-52 6.4±1 [36]
5 Vela X-1 1.4±0.5 [37]
6 V 0332+53 7.5±1.5 [38]
7 Cep X-4 3.8±0.6 [39]
8 Cen X-3 10±1 [40]
9 X Per 0.7±0.3 [41]
10 MXB 0656-072 3.9±0.1 [42]
11 XTE J1946+274 9.5±2.9 [43]
12 4U 1626-67 9 [44]
13 GX 301-2 4.1 [45]
14 Her X-1 6.6±0.4 [46]
15 A0535+26 2-0.7+0.4 [47]
16 1A1118−61 5±2 [48]
17 GRO J1008−57 5 [44]

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