2012A&A...538A..93Z


Query : 2012A&A...538A..93Z

2012A&A...538A..93Z - Astronomy and Astrophysics, volume 538A, 93-93 (2012/2-1)

Dark matter subhaloes as gamma-ray sources and candidates in the first Fermi-LAT catalogue.

ZECHLIN H.-S., FERNANDES M.V., ELSAESSER D. and HORNS D.

Abstract (from CDS):

The standard paradigm of hierarchical structure formation in a ΛCDM universe predicts the presence of dark matter subhaloes, hosted by Milky Way-sized galaxies. Anticipated subhalo masses range from 1010 down to a cut-off mass between 10–3 and 10–11M. If dark matter is composed of heavy self-annihilating or decaying particles, these subhaloes could be visible in the γ-ray band as faint and temporally constant sources without astrophysical counterparts. Based upon realistic subhalo models and current observational constraints on annihilating dark matter scenarios, we predict that one massive Galactic subhalo between 106 and 108M may already be present in the 11-month catalogue of Fermi-LAT. Indeed, at least twelve objects in the first Fermi catalogue qualify as candidates. The most promising object, 1FGL J0030.7+0724, is investigated in detail using a dedicated Swift X-ray follow-up observation and a refined positional analysis of the 24-month Fermi-LAT data. With the new observations, seven point-like X-ray sources have been discovered, of which SWIFT J003119.8+072454, which coincides with a faint radio source (12mJy at 1.4GHz), serves as a counterpart candidate of 1FGL J0030.7+0724. The broad-band spectral energy distribution is consistent with a high-energy-peaked blazar. However, flux and extent of 1FGL J0030.7+0724 may also be compatible with a dark matter subhalo. Detection of temporal variability or improved astrometry of 1FGL J0030.7+0724 are necessary to rule out or confirm an astrophysical origin. We discuss strategies to identify γ-ray sources that are associated with self-annihilating dark matter subhaloes.

Abstract Copyright:

Journal keyword(s): dark matter - Galaxy: halo - Galaxy: structure - gamma rays: general

Simbad objects: 38

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Number of rows : 38
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 2MASS J00220925-1853348 BLL 00 22 09.2685161956 -18 53 34.869877697 17.48 17.20 16.97     ~ 35 0
2 QSO B0019+058 BLL 00 22 32.44120914 +06 08 04.2690807   19.2   19.07   ~ 112 1
3 PSR J0023+0923 Psr 00 23 16.890 +09 23 24.18           ~ 80 0
4 NVSS J003000+072255 Rad 00 30 00.2512406404 +07 22 54.695062039   20.6       ~ 1 0
5 USNO-B1.0 0973-00005428 * 00 30 17.742 +07 21 41.07   21.0   20.4   ~ 1 1
6 SDSS J003017.75+072140.6 QSO 00 30 17.7589925130 +07 21 40.667274669           ~ 6 1
7 SWIFT J003017.8+072142 X 00 30 17.8 +07 21 42           ~ 1 0
8 SWIFT J003022.1+072623 X 00 30 22.1 +07 26 23           ~ 1 0
9 SDSS J003022.22+072621.3 * 00 30 22.224 +07 26 21.30           ~ 1 1
10 PSR J0030+0451 Psr 00 30 27.4277 +04 51 39.710           ~ 302 1
11 SDSS J003029.77+072010.3 G 00 30 29.778 +07 20 10.33           ~ 1 1
12 2MASS J00302977+0720101 NIR 00 30 29.779 +07 20 10.11           ~ 1 1
13 USNO-B1.0 0973-00005481 * 00 30 29.808 +07 20 10.67   20.4   18.9   ~ 1 1
14 USNO-B1.0 0973-00005484 * 00 30 29.88 +07 20 12.0   20.6   19.3   ~ 1 1
15 SWIFT J003030.0+072013 X 00 30 30.0 +07 20 13           ~ 1 0
16 NVSS J003030+072132 Rad 00 30 30.55 +07 21 32.5           ~ 1 0
17 SDSS J003031.22+072132.2 G 00 30 31.227 +07 21 32.26           ~ 1 0
18 SDSS J003049.61+072313.5 * 00 30 49.615 +07 23 13.59           ~ 1 1
19 SWIFT J003049.8+072316 X 00 30 49.8 +07 23 16           ~ 1 0
20 SDSS J003054.80+072323.1 * 00 30 54.803 +07 23 23.17           ~ 1 1
21 SWIFT J003054.9+072328 X 00 30 54.9 +07 23 28           ~ 1 0
22 USNO-B1.0 0973-00005560 * 00 30 54.960 +07 23 23.75   19.5   18.2   ~ 1 1
23 SDSS J003055.00+072323.2 * 00 30 54.997 +07 23 23.26           ~ 1 1
24 2MASS J00305500+0723233 NIR 00 30 55.004 +07 23 23.34           ~ 1 1
25 1FGL J0030.7+0724 BLL 00 31 19.7098594203 +07 24 53.557871455   19.8   18.6   ~ 30 0
26 2FGL J0051.4-6241 BLL 00 51 16.68 -62 42 04.3 17.50 17.42 17.38     ~ 41 0
27 WISEA J014347.41-584551.4 BLL 01 43 47.4327885304 -58 45 51.369643689           ~ 41 0
28 2FGL J0335.3-4501 BLL 03 35 14.500 -44 59 29.00           ~ 30 0
29 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5797 4
30 PSR J0614-3329 Psr 06 14 10.3479 -33 29 54.116           ~ 75 1
31 4FGL J0848.7+0508 Bz? 08 48 39.60 +05 06 18.0           ~ 14 0
32 87GB 132042.1+295714 BLL 13 23 02.75 +29 41 32.5   20.7       ~ 53 1
33 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12443 0
34 ATO J268.5491+32.2064 BLL 17 54 11.7992936028 +32 12 23.056109411           ~ 39 1
35 2FGL J2134.6-2130 BLL 21 34 30.179738 -21 30 32.80026           ~ 25 0
36 1FGL J2146.6-1345 Bla 21 46 37.01 -13 43 59.9           ~ 30 0
37 2MASS J23291427+3754146 Bla 23 29 14.2673278518 +37 54 14.482792004           ~ 38 1
38 NAME Galactic Ridge ? ~ ~           ~ 454 1

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2021.10.17-00:36:44

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