2019ApJ...880...95K

Query : 2019ApJ...880...95K

2019ApJ...880...95K - Astrophys. J., 880, 95-95 (2019/August-1)

Fermi-LAT observations of γ-ray emission toward the outer halo of M31.

KARWIN C.M., MURGIA S., CAMPBELL S. and MOSKALENKO I.V.

Abstract (from CDS):

The Andromeda galaxy is the closest spiral galaxy to us and has been the subject of numerous studies. It harbors a massive dark matter halo, which may span up to ∼600 kpc across and comprises ∼90% of the galaxy's total mass. This halo size translates into a large diameter of 42° on the sky, for an M31-Milky Way (MW) distance of 785 kpc, but its presumably low surface brightness makes it challenging to detect with γ-ray telescopes. Using 7.6 yr of Fermi Large Area Telescope (Fermi-LAT) observations, we make a detailed study of the γ-ray emission between 1-100 GeV toward M31's outer halo, with a total field radius of 60° centered at M31, and perform an in-depth analysis of the systematic uncertainties related to the observations. We use the cosmic-ray propagation code GALPROP to construct specialized interstellar emission models to characterize the foreground γ-ray emission from the MW, including a self-consistent determination of the isotropic component. We find evidence for an extended excess that appears to be distinct from the conventional MW foreground, having a total radial extension upward of ∼120-200 kpc from the center of M31. We discuss plausible interpretations of the excess emission, but emphasize that uncertainties in the MW foreground-and in particular, modeling of the H I-related components-have not been fully explored and may impact the results.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): astroparticle physics - cosmic rays - dark matter - galaxies: individual: M31 - Galaxy: halo - gamma rays: diffuse background

Simbad objects: 112

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Number of rows : 112
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 3FGL J0001.6+3535 Bz? 00 01 37 +35 35.4           ~ 6 0
2 3FGL J0003.4+3100 gam 00 03 37.1 +30 59 23           ~ 11 0
3 3FGL J0003.5+5721 gam 00 04 00.4 +57 15 28           ~ 9 0
4 QSO B0003+380 Bla 00 05 57.17538691 +38 20 15.1489639   19.4 18.10 17.16   ~ 155 1
5 NVSS J000652+461816 Bla 00 06 52.3254076304 +46 18 16.997744662           ~ 13 0
6 3FGL J0007.9+4006 Bz? 00 07 42.6 +40 08 02           ~ 17 0
7 2MASS J00075997+4712078 BLL 00 07 59.9724805320 +47 12 07.769093004   18.3   18.2   ~ 71 1
8 NVSS J000922+503028 BLL 00 09 22.7604063473 +50 30 28.834597215           ~ 47 0
9 1RXS J001442.2+580201 BLL 00 14 42.1250143528 +58 02 01.219861211           ~ 29 0
10 RX J0015.6+5551 BLL 00 15 40.1501873433 +55 51 44.665947351           ~ 40 1
11 RX J0018.4+2947 BLL 00 18 27.7897831296 +29 47 31.163294904       17.4   ~ 65 2
12 3FGL J0022.7+4651 Bla 00 22 45 +46 51.2           ~ 7 0
13 6C 002051+444042 Bla 00 23 35.44247367 +44 56 35.7581986       21.70   ~ 81 1
14 3FGL J0032.5+3912 Bla 00 32 35 +39 12.8           ~ 8 0
15 RX J0035.8+5950 BLL 00 35 52.6448284115 +59 50 04.513482441     19.5 17.2   ~ 195 1
16 3FHL J0039.2+4330 BLL 00 39 08.147 +43 30 14.64           ~ 37 0
17 B3 0045+013 Rad 00 39.7 +41 39           ~ 2 0
18 RX J0040.2+4049 BLL 00 40 13.8112928443 +40 50 04.756997684     19.30 19.9   ~ 80 1
19 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
20 QSO B0039+230 Bla 00 42 04.54516583 +23 20 01.0619642       19.40   ~ 127 1
21 RX J0042.1+3641 BLL 00 42 08.1061514568 +36 41 12.908168124     17.50 17.5   ~ 36 0
22 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
23 SDSS J004348.84+342626.1 Bla 00 43 48.8431545768 +34 26 26.091802608       19.9   ~ 78 1
24 RX J0045.3+2127 BLL 00 45 19.2982391160 +21 27 40.001545080 17.37 17.33 17.01 17.3   ~ 85 1
25 ICRF J004700.4+565742 BLL 00 47 00.42882470 +56 57 42.3945344       18.9   ~ 66 1
26 1RXS J004754.5+544758 BLL 00 47 52.0376461233 +54 47 45.909202284           ~ 25 0
27 6C 004509+393212 BLL 00 47 55.2237594912 +39 48 57.609757008   16.0 17.60 16.4   ~ 55 1
28 SDSS J004802.61+223524.0 Bla 00 48 02.6166680496 +22 35 24.125790660       19   ~ 59 1
29 RX J0048.9+4223 BLL 00 48 59.1606548688 +42 23 51.064163520           ~ 29 0
30 ICRF J005832.0+331117 BLL 00 58 32.06901704 +33 11 17.2144403       19   ~ 71 1
31 3FGL J0102.1+4458 BLL 01 02 10.8 +44 58 05           ~ 11 0
32 NAME CRATES J0102+4214 Bla 01 02 27.1487492736 +42 14 18.984248160       19   ~ 60 1
33 7C 0059+5808 Bla 01 02 45.76237340 +58 24 11.1366164   20.09 19.22 18.57 17.90 ~ 262 1
34 PSR J0103+48 Psr 01 02 50.6687164 +48 39 42.769776           ~ 41 0
35 2MASX J01032593+5337137 BLL 01 03 25.9580331336 +53 37 13.279637172           ~ 32 0
36 87GB 010219.8+391221 Bla 01 05 09.1962613704 +39 28 15.320001180     19.69 18.2   ~ 58 1
37 PSR J0106+4855 Psr 01 06 25.030 +48 55 52.01           ~ 51 0
38 NAME Loop III SR? 01 12 +78.3           ~ 97 1
39 QSO B0109+224 BLL 01 12 05.8247044608 +22 44 38.785880796   16.00 15.66 15.47   ~ 373 2
40 4C 31.03 Bla 01 12 50.3328920232 +32 08 17.435303556     18.0 18.1   ~ 140 1
41 6C 011029+493221 Bla 01 13 27.00680467 +49 48 24.0432101   18.4 18.4 17.80   ~ 130 1
42 RX J0115.7+2520 BLL 01 15 46.1420552904 +25 19 53.344003368 18.08 17.88 18.52     ~ 85 1
43 3FGL J0121.7+5154 BLL 01 21 45.3 +51 53 41           ~ 25 0
44 RX J0123.1+3420 BLL 01 23 08.6375580816 +34 20 48.664188060       16.8   ~ 132 1
45 NAME Wright Cloud HVC 01 24 06.1 +29 38 35           ~ 12 0
46 3FGL J0127.4+5433 Bla 01 27 29 +54 33.3           ~ 6 0
47 3FGL J0127.5+5634 Bla 01 27 35 +56 34.1           ~ 6 0
48 3FGL J0127.6+4851 Bla 01 27 54.6 +48 57 13           ~ 24 0
49 3FGL J0127.9+2551 Bla 01 28 25.8 +26 14 14           ~ 13 0
50 [VV2006] J012841.4+443917 Bla 01 28 41.3391 +44 39 18.092       19.5   ~ 37 1
51 2MASS J01311382+5545128 BLL 01 31 13.8248461104 +55 45 12.977586576           ~ 62 1
52 3FGL J0133.3+4324 Bla 01 32 52.4 +43 24 15           ~ 26 0
53 NVSS J013255+593217 BLL 01 32 55.2961066848 +59 32 15.927985860           ~ 16 0
54 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
55 RX J0134.4+2638 BLL 01 34 28.1946775464 +26 38 43.010995272   17.1   15.9   ~ 62 1
56 1RXS J013632.9+390556 BLL 01 36 32.5983798936 +39 05 59.199517428       15.5   ~ 146 2
57 6C 013354+473615 Bla 01 36 58.59480326 +47 51 29.1000720     19.50 19.25 15.21 ~ 537 1
58 RX J0137.7+5814 BLL 01 37 50.4761854680 +58 14 11.321731860           ~ 66 2
59 ICRF J014433.5+270503 BLL 01 44 33.55384903 +27 05 03.1179726       18.6   ~ 104 1
60 NVSS J014820+520205 BLL 01 48 20.3367706981 +52 02 05.125897724           ~ 36 1
61 3FGL J0149.6+4846 Bz? 01 50 27.5 +48 48 50           ~ 12 0
62 3FGL J0152.2+3707 Bla 01 52 15.1 +37 14 03           ~ 24 0
63 3FGL J0154.1+4642 Bla 01 54 08 +46 42.1           ~ 7 0
64 87GB 015148.1+441852 BLL 01 54 54.4669724856 +44 33 37.960388496     20.49 18.9   ~ 46 1
65 HVC 130+01-161 HVC 01 55.9 +60 38           ~ 53 0
66 ICRF J015631.4+391430 BLL 01 56 31.41013794 +39 14 30.9234946           ~ 60 2
67 3FGL J0202.5+4206 Bla 02 02 44.7 +42 04 17           ~ 22 0
68 NVSS J020345+304129 rG 02 03 45.35524711 +30 41 29.1068408           ~ 64 1
69 7C 020209.69+315812.00 Bla 02 05 04.92536206 +32 12 30.0954703     17.40 17.40   ~ 246 1
70 1RXS J020837.5+352314 BLL 02 08 38.1634090056 +35 23 12.806970864       18.8   ~ 110 0
71 1RXS J020917.6+444951 BLL 02 09 17.1290697449 +44 49 46.364338803     18.70 18.1   ~ 37 0
72 3FGL J0211.7+5402 gam 02 11 43 +54 02.8           ~ 8 0
73 1FGL J0212.3+5319 EB* 02 12 10.4774318712 +53 21 38.778250464   15.213 14.677 14.286   ~ 58 0
74 RX J0214.2+5144 BLL 02 14 17.9358553848 +51 44 51.945795816       16.5   ~ 133 1
75 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 365 2
76 7C 021548.00+362642.00 Bla 02 18 50.0425653672 +36 40 42.589654464           ~ 38 1
77 6C 021803+354230 BLL 02 21 05.4920852208 +35 56 13.848581904   20.0 20.0 19.60   ~ 603 3
78 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 942 2
79 3FGL J0223.6+3927 Bla 02 23 40 +39 27.2           ~ 7 0
80 87GB 025515.9+201804 BLL 02 58 07.3086122544 +20 30 01.589316804       18.4   ~ 50 1
81 NAME Loop XI Rad 09 30 +06.           ~ 3 1
82 NAME North Polar Spur ISM 12 00 +00.0           ~ 405 1
83 NAME Loop I SR? 15 01 -38.7           ~ 414 2
84 NAME Fermi Bubbles bub 17 45 -29.0           ~ 525 0
85 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
86 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
87 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2
88 NVSS J230012+405224 BLL 23 00 12.3707568624 +40 52 24.693697956           ~ 30 2
89 PSR J2302+4442 Psr 23 02 46.9789 +44 42 22.102           ~ 124 0
90 1RXS J230437.1+370506 BLL 23 04 36.7146091872 +37 05 07.422633924     17.50 18.1   ~ 66 0
91 6C 230840+340844 Bla 23 11 05.32880063 +34 25 10.9049514     19.5 19.2   ~ 138 1
92 3FGL J2313.1+3935 Bz? 23 13 35.9 +39 45 52           ~ 15 0
93 NVSS J232127+511117 BLL 23 21 27.4366936273 +51 11 15.086568411           ~ 20 0
94 ICRF J232154.9+320407 Bla 23 21 54.95598750 +32 04 07.6225103     18 20   ~ 115 1
95 3FGL J2321.6+4438 Bla 23 22 08.0 +44 40 25           ~ 17 0
96 1RXS J232243.7+343616 BLL 23 22 44.0142017808 +34 36 13.873220208       13.2   ~ 87 1
97 1RXS J232352.2+421057 BLL 23 23 52.0756006920 +42 10 58.553658012     17.00 19.9   ~ 98 1
98 NAME Loop 2 SR? 23 25 +26.5           ~ 82 1
99 ICRF J232517.8+395736 BLL 23 25 17.8701567192 +39 57 36.512873352   17.8 17.80 17.8   ~ 83 1
100 2MASS J23291427+3754146 Bla 23 29 14.2674395856 +37 54 14.484094488           ~ 50 1
101 NAME Loop IIIs Rad 23 31 +38.           ~ 7 1
102 3FGL J2337.5+4108 BLL 23 37 35 +41 08.3           ~ 6 0
103 2MASS J23404364+3855173 BLL 23 40 43.6533406913 +38 55 17.370882430           ~ 20 0
104 1RXS J234332.5+343957 BLL 23 43 33.5859477792 +34 39 50.949452160           ~ 56 1
105 QSO B2344+514 BLL 23 47 04.8372110928 +51 42 17.877513168     15.50 10.7   ~ 500 1
106 3FGL J2347.9+5436 BLL 23 47 53.31 +54 36 30.0           ~ 23 1
107 3FGL J2354.0+2722 BLL 23 54 06.4 +27 20 58           ~ 17 0
108 6C 235150+453621 Bla 23 54 21.68022501 +45 53 04.2365520   20.6 20.60 19.1   ~ 252 1
109 NVSS J235612+403648 Bla 23 56 12.7423370256 +40 36 46.976785524           ~ 40 1
110 B3 2355+382 BLL 23 58 25.1731211064 +38 28 56.494492536           ~ 37 1
111 [VV96] J235859.8+392228 Bla 23 58 59.85517054 +39 22 28.3057319     21.20 19.2   ~ 73 1
112 NAME Local Group GrG ~ ~           ~ 9325 0

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