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 - 2021
#notes
1 3FGL J0001.6+3535 Bz? 00 01 37 +35 35.4           ~ 5 0
2 3FGL J0003.4+3100 gam 00 03 37.1 +30 59 23           ~ 4 0
3 3FGL J0003.5+5721 gam 00 04 00.4 +57 15 28           ~ 5 0
4 QSO B0003+380 QSO 00 05 57.17539168 +38 20 15.1489409   19.4 18.10 17.16   ~ 116 1
5 3FGL J0006.6+4618 Bla 00 06 40.7 +46 18 17           ~ 7 0
6 3FGL J0007.9+4006 Bz? 00 07 42.6 +40 08 02           ~ 7 0
7 2FGL J0007.8+4713 BLL 00 07 59.9717337384 +47 12 07.770189406   18.3   18.2   ~ 49 1
8 2FGL J0009.1+5030 BLL 00 09 22.53 +50 30 28.9           ~ 32 0
9 3FGL J0014.7+5802 Bz? 00 14 42.120 +58 02 01.21           ~ 18 1
10 2MASX J00154017+5551446 BLL 00 15 40.179 +55 51 44.65           ~ 21 1
11 2FGL J0018.5+2945 BLL 00 18 27.7897527183 +29 47 31.164485140     19.4 17.4   ~ 48 0
12 3FGL J0022.7+4651 Bla 00 22 45 +46 51.2           ~ 5 0
13 7C 002055.00+444012.00 QSO 00 23 35.4424670 +44 56 35.758304       21.70   ~ 50 1
14 3FGL J0032.5+3912 Bla 00 32 35 +39 12.8           ~ 7 0
15 QSO B0033+595 BLL 00 35 52.554 +59 50 04.19     19.5 17.2   ~ 145 2
16 3FHL J0039.2+4330 BLL 00 39 08.147 +43 30 14.64           ~ 25 0
17 B3 0045+013 Rad 00 39.7 +41 39           ~ 2 0
18 5C 3.76 BLL 00 40 13.800 +40 50 04.73     19.30 19.9   ~ 62 1
19 M 110 GiG 00 40 22.0544552438 +41 41 07.496294862   8.92 8.07     ~ 1239 1
20 QSO B0039+230 QSO 00 42 04.54517179 +23 20 01.0620234       19.40   ~ 91 1
21 4FGL J0042.0+3640 BLL 00 42 08.1059617887 +36 41 12.903062019     17.50 17.5   ~ 26 0
22 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11446 1
23 87GB 004106.9+340948 Bla 00 43 48.8450573531 +34 26 26.084477500       19.9   ~ 41 1
24 2FGL J0045.3+2127 BLL 00 45 19.2978209676 +21 27 39.998419481 17.37 17.33 17.01 17.3   ~ 61 1
25 ICRF J004700.4+565742 QSO 00 47 00.4288120 +56 57 42.394520       18.9   ~ 42 1
26 3FGL J0047.9+5447 BLL 00 47 52.05 +54 47 46.0           ~ 12 0
27 5C 3.178 BLL 00 47 55.2233876412 +39 48 57.608728891   16.0   16.4   ~ 38 1
28 2FGL J0047.9+2232 QSO 00 48 02.619 +22 35 24.07       19   ~ 31 0
29 3FHL J0049.0+4224 BLL 00 48 59.16024 +42 23 51.1296           ~ 16 0
30 ICRF J005832.0+331117 BLL 00 58 32.0690271 +33 11 17.214490       19   ~ 46 1
31 3FGL J0102.1+4458 BLL 01 02 10.8 +44 58 05           ~ 6 0
32 NAME CRATES J0102+4214 QSO 01 02 27.1474181819 +42 14 18.995695678       19   ~ 36 1
33 7C 0059+5808 QSO 01 02 45.76238248 +58 24 11.1366009   20.09 19.22 18.57 17.90 ~ 202 1
34 PSR J0103+48 Psr 01 03 00.000 +48 00 00.00           ~ 28 0
35 2MASX J01032593+5337137 BLL 01 03 25.9580861342 +53 37 13.286186368           ~ 20 0
36 87GB 010219.8+391221 Bla 01 05 09.1958275067 +39 28 15.311958767     19.69 18.2   ~ 32 1
37 PSR J0106+4855 Psr 01 06 25.030 +48 55 52.01           ~ 38 0
38 NAME Loop III SR? 01 12 +78.3           ~ 76 1
39 QSO B0109+224 BLL 01 12 05.8246825085 +22 44 38.786096536   16.00 15.66 15.47   ~ 310 2
40 4C 31.03 QSO 01 12 50.3327153078 +32 08 17.434986112     18.0 18.1   ~ 94 1
41 QSO B0110+495 QSO 01 13 27.00680 +49 48 24.0435   18.4 18.4 17.80   ~ 94 1
42 2MASS J01154616+2519534 BLL 01 15 46.1420976395 +25 19 53.348116622 18.08 17.88 18.52     ~ 58 1
43 3FGL J0121.7+5154 BLL 01 21 45.3 +51 53 41           ~ 15 0
44 4FGL J0123.1+3421 BLL 01 23 08.6 +34 20 48     15.2 16.8   ~ 102 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           ~ 5 0
47 3FGL J0127.5+5634 Bla 01 27 35 +56 34.1           ~ 5 0
48 3FGL J0127.6+4851 Bla 01 27 54.6 +48 57 13           ~ 6 0
49 3FGL J0127.9+2551 Bla 01 27 55 +25 51.3           ~ 8 0
50 [VV2006] J012841.4+443917 QSO 01 28 41.3316 +44 39 17.907       19.5   ~ 24 1
51 2MASS J01311382+5545128 BLL 01 31 13.8244089174 +55 45 12.977195743           ~ 24 1
52 3FGL J0133.3+4324 Bla 01 32 52.4 +43 24 15           ~ 14 0
53 3FGL J0133.3+5930 BLL 01 33 21 +59 30.8           ~ 9 0
54 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5343 1
55 RX J0134.4+2638 BLL 01 34 28.1947502562 +26 38 43.011658030   17.1   15.9   ~ 42 0
56 87GB 013336.4+385101 BLL 01 36 32.5981369228 +39 05 59.196637223     15.80 15.5   ~ 108 1
57 QSO B0133+476 Bla 01 36 58.59480585 +47 51 29.1000445     18.0 19.25 15.21 ~ 464 1
58 2MASS J01375047+5814112 BLL 01 37 50.4768015493 +58 14 11.325812306           ~ 40 2
59 ICRF J014433.5+270503 BLL 01 44 33.5538645 +27 05 03.118062       18.6   ~ 68 1
60 87GB 014509.6+514721 BLL 01 48 20.20 +52 02 05.8           ~ 17 1
61 3FGL J0149.6+4846 Bz? 01 50 27.5 +48 48 50           ~ 7 0
62 3FGL J0152.2+3707 Bla 01 52 15.1 +37 14 03           ~ 12 0
63 3FGL J0154.1+4642 Bla 01 54 08 +46 42.1           ~ 6 0
64 87GB 015148.1+441852 BLL 01 54 54.4669337681 +44 33 37.958909590     20.49 18.9   ~ 31 1
65 HVC 130+01-161 HVC 01 55.9 +60 38           ~ 52 0
66 ICRF J015631.4+391430 BLL 01 56 31.4101498 +39 14 30.923430           ~ 39 1
67 3FGL J0202.5+4206 Bla 02 02 44.7 +42 04 17           ~ 9 0
68 ICRF J020345.3+304129 AGN 02 03 45.35604864 +30 41 29.1087951           ~ 42 1
69 7C 020209.69+315812.00 QSO 02 05 04.92536007 +32 12 30.0954538     18.00 17.40   ~ 204 1
70 QSO B0205+350 BLL 02 08 38.1632218391 +35 23 12.802507619     19.24 18.8   ~ 95 0
71 4FGL J0209.3+4449 BLL 02 09 17.132 +44 49 46.41     18.70 18.1   ~ 21 0
72 3FGL J0211.7+5402 gam 02 11 43 +54 02.8           ~ 6 0
73 1FGL J0212.3+5319 gam 02 12 10.477 +53 21 38.74           ~ 33 0
74 ICRF J021417.9+514451 BLL 02 14 17.9344275 +51 44 51.947352     16.50 16.5   ~ 91 1
75 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 308 2
76 7C 021548.00+362642.00 Bla 02 18 50.0451442570 +36 40 42.594858209           ~ 23 1
77 QSO B0218+357 QSO 02 21 05.5 +35 56 14   20.0 20.0 19.60   ~ 518 2
78 3C 66A BLL 02 22 39.6111630878 +43 02 07.797284539   15.71 15.21 14.5   ~ 818 1
79 3FGL J0223.6+3927 Bla 02 23 40 +39 27.2           ~ 6 0
80 87GB 025515.9+201804 BLL 02 58 07.3096289809 +20 30 01.617169842       18.4   ~ 30 1
81 NAME Loop XI Rad 09 30 +06.           ~ 2 1
82 NAME North Polar Spur ISM 12 00 +00.0           ~ 319 1
83 NAME Loop I SR? 15 01 -38.7           ~ 342 2
84 NAME Fermi Bubbles bub 17 45 -29.0           ~ 308 0
85 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12390 0
86 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 69 0
87 3C 454.3 Bla 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2604 2
88 3FGL J2300.0+4053 BLL 23 00 12.3716182754 +40 52 24.682614584           ~ 19 1
89 PSR J2302+4442 Psr 23 02 46.9789 +44 42 22.102           ~ 80 0
90 2FGL J2304.7+3703 BLL 23 04 36.7142790996 +37 05 07.421678679     17.50 18.1   ~ 49 0
91 QSO B2308+341 QSO 23 11 05.3287941 +34 25 10.905383     19.5 19.2   ~ 90 1
92 3FGL J2313.1+3935 Bz? 23 13 35.9 +39 45 52           ~ 7 0
93 3FHL J2321.4+5112 BLL 23 21 27.7 +51 11 40           ~ 11 0
94 ICRF J232154.9+320407 QSO 23 21 54.95598893 +32 04 07.6224628     18 20   ~ 74 1
95 3FGL J2321.6+4438 Bla 23 22 08.0 +44 40 25           ~ 7 0
96 2MASS J23224401+3436139 BLL 23 22 44.0146253282 +34 36 13.873359842     15.88 13.2   ~ 63 1
97 2E 4725 BLL 23 23 52.0756284137 +42 10 58.552874013     17.00 19.9   ~ 79 0
98 NAME Loop 2 SR? 23 25 +26.5           ~ 71 1
99 3FHL J2325.2+3957 BLL 23 25 17.8704120896 +39 57 36.514040778   17.8 17.80 17.8   ~ 63 1
100 2MASS J23291427+3754146 Bla 23 29 14.2673278518 +37 54 14.482792004           ~ 38 1
101 NAME Loop IIIs Rad 23 31 +38.           ~ 2 1
102 3FGL J2337.5+4108 BLL 23 37 35 +41 08.3           ~ 5 0
103 4FGL J2340.5+3854 BLL 23 40 43.05 +38 55 11.4           ~ 11 0
104 1RXS J234332.5+343957 BLL 23 43 33.5859088009 +34 39 50.950603117           ~ 39 1
105 QSO B2344+514 BLL 23 47 04.8376303689 +51 42 17.875387216     15.50 10.7   ~ 407 0
106 3FGL J2347.9+5436 BLL 23 47 53.30 +54 36 30.3           ~ 11 0
107 3FGL J2354.0+2722 BLL 23 54 06.4 +27 20 58           ~ 6 0
108 4C 45.51 QSO 23 54 21.68022839 +45 53 04.2365363   20.6 20.6 19.1   ~ 206 1
109 9Y-MST J2356+4035 AGN 23 56 12.7428067673 +40 36 46.977297480           ~ 25 0
110 B3 2355+382 Sy2 23 58 25.1730849640 +38 28 56.491599597           ~ 15 1
111 [VV96] J235859.8+392228 QSO 23 58 59.8551882 +39 22 28.305898     21.20 19.2   ~ 47 1
112 NAME Local Group GrG ~ ~           ~ 7359 0

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2021.09.26-08:32:56

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