2024ApJ...968...37H

Query : 2024ApJ...968...37H

2024ApJ...968...37H - Astrophys. J., 968, 37 (2024/June-2)

A Simple but Powerful Method to Reduce Background Noise in Celestial Gamma-Ray Images.

HEDAYATI KH H., SOOR M. and AKHONDI F.

Abstract (from CDS):

Reducing background noise is essential for clear data analysis and signal detection. In this study, we introduce a novel denoising algorithm tailored for gamma-ray astronomical data, utilizing local density sampling techniques. The proposed algorithm preferentially amplifies regions of high local density, which are indicative of potential sources, while diminishing the influence of low-density areas. This selective enhancement significantly bolsters the performance of clustering algorithms in pinpointing point sources, effectively minimizing the interference of high-density noise that could be mistaken for genuine sources. We have implemented this algorithm on Fermi Large Area Telescope data, and our results showcase a marked advancement in the clustering algorithm's capacity to discard false sources.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Astronomy data analysis - Astronomy image processing

Simbad objects: 54

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Number of rows : 54
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 US 1889 BLL 08 54 09.8887760136 +44 08 30.280418016   17.40 17.14 17   ~ 70 1
2 6C 085940+470301 Bla 09 03 03.99010563 +46 51 04.1374172   19.90 19.44 18.7   ~ 285 1
3 4C 42.28 QSO 09 04 15.62846918 +42 38 04.7653533   19.9 19.9     ~ 87 1
4 Ton 1015 BLL 09 10 37.0353299208 +33 29 24.418940568   16.19 15.71 15.9   ~ 100 2
5 ICRF J091042.1+224835 Bla 09 10 42.1337 +22 48 35.565   21.17 20.90 20.69   ~ 85 1
6 9Y-MST J0910+3901 Bla 09 10 50.2 +39 00 00           ~ 25 0
7 7C 090843.79+340139.00 BLL 09 11 47.7614248824 +33 49 16.794379596   19.39 18.89 18.6   ~ 65 1
8 6C 090857+413813 Bla 09 12 11.6174 +41 26 09.356       20.3   ~ 82 1
9 Ton 397 BLL 09 15 52.4015550384 +29 33 24.042671532   16.79 16.39 16.085   ~ 238 1
10 4C 38.28 Bla 09 16 48.90457434 +38 54 28.1463634   19.92 19.38 18.77   ~ 159 1
11 6C 091740+445437 Bla 09 20 58.45848666 +44 41 53.9850947   18.40 18.16 16.55   ~ 407 1
12 9Y-MST J0921+2335 BLL 09 21 45.358 +23 35 48.41           ~ 30 0
13 6C 092018+413804 Bla 09 23 31.30498064 +41 25 27.4393351       20.01   ~ 88 1
14 7C 092054.7+282821 Bla 09 23 51.52339821 +28 15 25.0219334   19.70 19.48 19.00   ~ 112 1
15 3FGL J0925.7+3129 Bla 09 25 46.9 +31 26 49           ~ 20 0
16 4FGL J0927.2+2454 Bz? 09 27 17.0 +24 54 07           ~ 15 0
17 [VV2006] J092837.5+404845 BLL 09 28 37.4357240448 +40 48 45.359432784   18.98 18.66     ~ 35 0
18 4FGL J0930.7+3502 Bz? 09 30 43.5 +35 02 00           ~ 16 0
19 2MASS J09323935+1042352 BLL 09 32 39.3632208192 +10 42 35.178509520   19.41 18.63 17.6   ~ 31 0
20 ICRF J093406.6+392632 BLL 09 34 06.67011639 +39 26 32.1332266   20.48 20.06 19.28   ~ 65 1
21 4FGL J0936.5+1847 Bz? 09 36 32.3 +18 47 51           ~ 12 0
22 [VV2006] J094635.1+101705 Bla 09 46 35.06995887 +10 17 06.1344498   20.03 19.69 18.9   ~ 120 1
23 4FGL J0947.6+2215 Bz? 09 47 37.0 +22 15 36           ~ 15 0
24 US 1015 BLL 09 50 11.8169003520 +45 53 20.052168648   19.64 19.00     ~ 59 1
25 4FGL J0950.2+0615 Bz? 09 50 14.3 +06 15 30           ~ 13 0
26 NVSS J095249+071330 BLL 09 52 49.5769750296 +07 13 30.043757136           ~ 31 1
27 7C 095359.3+252945 Bla 09 56 49.87537985 +25 15 16.0498155   17.46 17.21 17.96   ~ 367 2
28 4FGL J0957.8+3423 Bz? 09 57 53.0 +34 23 51           ~ 17 0
29 RX J0959.4+2123 BLL 09 59 29.8891063800 +21 23 21.092839476           ~ 48 1
30 9C J1001+2911 BLL 10 01 10.2057148656 +29 11 37.537140264   19.00 18.34 16.39   ~ 123 1
31 1RXS J100235.8+221609 BLL 10 02 34.4165616288 +22 16 14.884159692   18.92   19.41   ~ 43 0
32 RX J1006.9+3454 BLL 10 06 56.4721611528 +34 54 45.192297024   19.48 19.03 18.2   ~ 59 0
33 QSO J1008+0621 BLL 10 08 00.81616040 +06 21 21.2160257 17.61 17.17 17.85 16.73   ~ 123 1
34 ATO J153.0556+06.5158 BLL 10 12 13.3484443872 +06 30 57.192683436   17.72 17.39 16.9   ~ 105 1
35 SDSS J101241.37+243923.4 Bla 10 12 41.3779909824 +24 39 23.394747816   19.77 19.58 19.4   ~ 82 1
36 RX J1012.7+4229 BLL 10 12 44.3054821248 +42 29 57.094313532   19.01 18.43     ~ 93 1
37 NVSS J101349+344550 Bla 10 13 49.61404321 +34 45 50.7834679   19.32 18.95 19.30   ~ 151 1
38 4FGL J1014.7+3210 Bz? 10 14 44.3 +32 10 24           ~ 10 0
39 QSO J1016+0513 Bla 10 16 03.13647602 +05 13 02.3413146   20.26 19.83 20   ~ 162 1
40 7C 1015+3557 Bla 10 18 10.98810472 +35 42 39.4409041   18.62 18.07 17.65   ~ 212 1
41 3FGL J1018.1+1904 Bz? 10 18 11.5 +19 05 47           ~ 17 0
42 [VV2006] J101827.8+053029 Bla 10 18 27.84828610 +05 30 29.9620200   19.63 19.33 20.05   ~ 112 1
43 4FGL J1019.7+0511 Bz? 10 19 46.0 +05 11 26           ~ 15 0
44 4C 40.25 Bla 10 23 11.56566843 +39 48 15.3853581   17.5 17.5 17.18   ~ 182 1
45 QSO J1024+2332 BLL 10 24 53.6370693744 +23 32 33.963550476   18.00 17.42 16.6   ~ 83 1
46 3FGL J1028.0+1829 BLL 10 27 40.6 +18 28 53           ~ 24 0
47 6C 102947+375354 BLL 10 32 40.7210836656 +37 38 26.750635656   18.42 18.07 17.3   ~ 60 1
48 7C 1030+4131 Bla 10 33 03.70787172 +41 16 06.2329333   20.01 19.64 19.97   ~ 234 1
49 RX J1033.7+3708 BLL 10 33 46.3947713592 +37 08 25.141905816   20.96 20.14     ~ 32 0
50 [VV96] J103633.0+220312 BLL 10 36 32.9805521328 +22 03 12.205766268   19.25 19.15 19.01   ~ 83 1
51 4FGL J1036.5+1231 Bz? 10 36 35.5 +12 31 22           ~ 12 0
52 RX J1040.9+1342 BLL 10 40 58.3765733673 +13 41 50.635572203           ~ 29 0
53 NVSS J104939+154838 BLL 10 49 39.3568561080 +15 48 37.578031668           ~ 47 1
54 3FGL J1049.8+1425 Bla 10 49 52.2 +14 29 01           ~ 25 0

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