2025ApJ...980...81H

Query : 2025ApJ...980...81H

2025ApJ...980...81H - Astrophys. J., 980, 81 (2025/February-2)

Fermi Unassociated Sources in the MeerKAT Absorption Line Survey.

HIMES M., JAGANNATHAN P., FRAIL D.A., SCHINZEL F., GUPTA N., BALASHEV S.A., COMBES F., DEKA P.P., KLOCKNER H.-R., MOMJIAN E. and WAGENVELD J.D.

Abstract (from CDS):

Over 2000 γ-ray sources identified by the Large Area Telescope on NASA's Fermi Gamma-ray Space Telescope are considered unassociated, meaning that they have no known counterparts in any other frequency regime. We have carried out an image-based search for steep spectrum radio sources, with in-band spectral index < -1.4, within the error regions of Fermi unassociated sources using 1-1.4 GHz radio data from the MeerKAT Absorption Line Survey (MALS) data release. The first MALS data release with a median rms noise of 22-25 μJy and 735,649 sources is a significant advance over past image-based searches with improvements in sensitivity, resolution, and bandwidth. Steep spectrum candidates were identified using a combination of in-band spectral indices from MALS and existing radio surveys. We developed an optical and infrared source classification scheme in order to distinguish between Galactic pulsars and radio galaxies. In total, we identify nine pulsar candidates toward six Fermi sources that are worthy of follow-up for pulsation searches. We also report 41 steep spectrum radio galaxy candidates that may be of interest in searches for high-redshift radio galaxies. We show that MALS, due to its excellent continuum sensitivity, can detect 80% of the known pulsar population. This exhibits the promise of identifying exotic pulsar candidates with future image-based surveys with the Square Kilometre Array and its precursors.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Millisecond pulsars - Pulsars - Gamma-ray sources - Discrete radio sources - Radio astrometry - Radio galaxies

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 90

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Number of rows : 90
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 MALS J004136.39-010937.1 Rad 00 41 36.38967000 -01 09 37.1153412           ~ 1 0
2 MALS J004151.00-010950.5 Rad 00 41 51.00804000 -01 09 50.5288224           ~ 1 0
3 MALS J013134.98-095325.9 Rad 01 31 34.98756000 -09 53 25.9342224           ~ 1 0
4 4FGL J0132.1-0956 gam 01 32 07.3 -09 56 19           ~ 6 0
5 NVSS J013234-100136 rG 01 32 34.55154 -10 01 36.5881           ~ 1 0
6 MALS J015122.71-063502.9 Rad 01 51 22.710 -06 35 02.94           ~ 1 0
7 PSR B0148-06 Psr 01 51 22.71800 -06 35 02.9800           ~ 112 0
8 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 365 2
9 MALS J025142.87-270515.9 Rad 02 51 42.873590 -27 05 15.91152           ~ 1 0
10 MALS J025157.96-265942.6 Rad 02 51 57.9605900 -26 59 42.609408           ~ 1 0
11 MALS J025218.21-271316.0 Rad 02 52 18.2129000 -27 13 16.058208           ~ 1 0
12 4FGL J0252.3-2707 gam 02 52 20.2 -27 07 51           ~ 6 0
13 MALS J025243.39-271733.4 Rad 02 52 43.3980700 -27 17 33.478692           ~ 1 0
14 MALS J025300.17-270837.0 Rad 02 53 00.1711600 -27 08 37.069368           ~ 1 0
15 4FGL J0443.3-5949 gam 04 43 19.0 -59 49 42           ~ 2 0
16 MALS J044325.75-594707.2 Rad 04 43 25.75598 -59 47 07.2528           ~ 1 0
17 MALS J044335.09-594906.7 Rad 04 43 35.0973900 -59 49 06.743928           ~ 1 0
18 PSR J0520-2553 Psr 05 20 36.185 -25 53 12.29           ~ 26 0
19 MALS J052036.19-255312.6 Rad 05 20 36.200 -25 53 12.69           ~ 1 0
20 MALS J060820.47-230127.7 Rad 06 08 20.4738600 -23 01 27.715296           ~ 1 0
21 3FGL J0608.2-2306 Bz? 06 08 36.1 -23 05 30           ~ 11 0
22 MALS J060841.66-230613.1 Rad 06 08 41.6653400 -23 06 13.133088           ~ 1 0
23 MALS J063347.19-304842.9 Rad 06 33 47.1906400 -30 48 42.986628           ~ 1 0
24 MALS J063347.20-304843.2 Rad 06 33 47.2013800 -30 48 43.212564           ~ 1 0
25 MALS J063408.80-305041.2 Rad 06 34 08.8077100 -30 50 41.225964           ~ 1 0
26 MALS J063424.94-303809.3 Rad 06 34 24.9440000 -30 38 09.346308           ~ 1 0
27 MALS J063429.91-305411.0 Rad 06 34 29.9172100 -30 54 11.008296           ~ 1 0
28 MALS J063429.94-304642.1 Rad 06 34 29.9398100 -30 46 42.157416           ~ 1 0
29 MALS J063432.91-305803.8 Rad 06 34 32.919270 -30 58 03.82152           ~ 1 0
30 4FGL J0634.6-3046c gam 06 34 40.1 -30 46 15           ~ 5 0
31 MALS J063441.26-304701.5 Rad 06 34 41.2687600 -30 47 01.593744           ~ 1 0
32 MALS J063443.35-304338.8 Rad 06 34 43.3524500 -30 43 38.872596           ~ 1 0
33 MALS J063506.41-305625.1 Rad 06 35 06.4138600 -30 56 25.133064           ~ 1 0
34 MALS J063506.44-305624.8 Rad 06 35 06.4399600 -30 56 24.795096           ~ 1 0
35 MALS J063518.93-304016.7 Rad 06 35 18.937600 -30 40 16.75884           ~ 1 0
36 MALS J063520.46-304736.2 Rad 06 35 20.464990 -30 47 36.27438           ~ 1 0
37 MALS J063522.40-305337.6 Rad 06 35 22.4041800 -30 53 37.628556           ~ 1 0
38 MALS J063522.62-304736.1 Rad 06 35 22.6225300 -30 47 36.161448           ~ 1 0
39 MALS J082100.90-064913.9 Rad 08 21 00.90600000 -06 49 13.9931976           ~ 1 0
40 4FGL J0821.0-0651 gam 08 21 02.8 -06 51 05           ~ 2 0
41 MALS J090043.94-314430.5 Rad 09 00 43.94 -31 44 30.5           ~ 1 0
42 PSR J0900-3144 Psr 09 00 43.95220 -31 44 30.8722           ~ 68 0
43 4FGL J0944.3-0911 gam 09 44 21.7 -09 11 32           ~ 2 0
44 MALS J094429.13-091337.8 Rad 09 44 29.13362000 -09 13 37.8679404           ~ 1 0
45 MALS J122124.72-063351.7 Rad 12 21 24.730 -06 33 51.73           ~ 1 0
46 PSR J1221-0633 Psr 12 21 24.76 -06 33 51.7           ~ 40 0
47 MALS J124017.50-412451.1 Rad 12 40 17.510 -41 24 51.17           ~ 1 0
48 PSR B1237-41 Psr 12 40 17.61 -41 24 51.7           ~ 31 0
49 MALS J124518.45-070133.3 Rad 12 45 18.45170000 -07 01 33.3774192           ~ 1 0
50 MALS J132143.69-462635.7 Rad 13 21 43.6963000 -46 26 35.781288           ~ 1 0
51 MALS J132155.24-462557.1 Rad 13 21 55.2479500 -46 25 57.174348           ~ 1 0
52 4FGL J1322.0-4624 gam 13 22 03.1 -46 24 53           ~ 4 0
53 MALS J132833.45-492134.2 Rad 13 28 33.450 -49 21 34.29           ~ 1 0
54 PSR B1325-49 Psr 13 28 33.58 -49 21 33.4           ~ 39 0
55 MALS J133411.00-385504.9 Rad 13 34 11.0090900 -38 55 04.942164           ~ 1 0
56 MALS J133436.33-390212.5 Rad 13 34 36.33619 -39 02 12.5574           ~ 1 0
57 4FGL J1334.8-3856 gam 13 34 48.5 -38 56 28           ~ 6 0
58 MALS J133450.89-390354.6 Rad 13 34 50.8895300 -39 03 54.676404           ~ 1 0
59 MALS J133504.13-385859.0 Rad 13 35 04.13002 -38 58 59.0124           ~ 1 0
60 MALS J133506.65-385618.4 Rad 13 35 06.655220 -38 56 18.39606           ~ 1 0
61 MALS J133515.17-385258.5 Rad 13 35 15.1762100 -38 52 58.498824           ~ 1 0
62 MALS J133517.57-385834.7 Rad 13 35 17.5711400 -38 58 34.702896           ~ 1 0
63 PSR J1346-4918 Psr 13 46 22.35 -49 18 07.2           ~ 6 0
64 MALS J134622.42-491806.3 Rad 13 46 22.430 -49 18 06.32           ~ 1 0
65 4FGL J1620.9+0021 gam 16 20 58.3 +00 21 32           ~ 2 0
66 MALS J162101.76+002317.4 Rad 16 21 01.76266000 +00 23 17.4514344           ~ 1 0
67 PSR B1620-09 Psr 16 23 17.65800 -09 08 48.9000           ~ 59 0
68 MALS J162317.67-090848.5 Rad 16 23 17.670 -09 08 48.57           ~ 1 0
69 MALS J172834.75-000744.0 Rad 17 28 34.750 -00 07 44.03           ~ 1 0
70 PSR B1726-00 Psr 17 28 34.819 -00 07 45.00           ~ 33 0
71 MALS J173853.93+033311.5 Rad 17 38 53.93 +03 33 11.5           ~ 1 0
72 PSR J1738+0333 Psr 17 38 53.966386 +03 33 10.87200           ~ 191 1
73 MALS J193206.06-365501.1 Rad 19 32 06.060 -36 55 01.11           ~ 1 0
74 PSR J1932-3655 Psr 19 32 06.12800 -36 55 01.7800           ~ 24 0
75 MALS J195908.94-184034.7 Rad 19 59 08.9451400 -18 40 34.781268           ~ 1 0
76 MALS J195912.05-184237.5 Rad 19 59 12.053330 -18 42 37.59408           ~ 1 0
77 MALS J195920.98-184326.1 Rad 19 59 20.9820200 -18 43 26.183352           ~ 1 0
78 MALS J195922.05-184741.6 Rad 19 59 22.05454 -18 47 41.6436           ~ 1 0
79 MALS J195939.23-183924.2 Rad 19 59 39.2393000 -18 39 24.245748           ~ 1 0
80 MALS J195941.56-184145.4 Rad 19 59 41.561640 -18 41 45.40578           ~ 1 0
81 4FGL J1959.8-1835 gam 19 59 52.6 -18 35 16           ~ 2 0
82 MALS J195953.95-184035.9 Rad 19 59 53.9589100 -18 40 35.989104           ~ 1 0
83 MALS J195955.80-184710.5 Rad 19 59 55.80494 -18 47 10.5882           ~ 1 0
84 MALS J203217.85-054325.2 Rad 20 32 17.85053000 -05 43 25.2195168           ~ 1 0
85 MALS J212443.80-335845.9 Rad 21 24 43.810 -33 58 45.90           ~ 1 0
86 PSR J2124-3358 Psr 21 24 43.834930 -33 58 45.49195           ~ 337 1
87 PSR B2122+13 Psr 21 24 46.574 +14 07 19.30           ~ 37 0
88 MALS J212446.64+140719.2 Rad 21 24 46.650 +14 07 19.26           ~ 1 0
89 MALS J225656.33-102434.8 Rad 22 56 56.330 -10 24 34.80           ~ 1 0
90 PSR J2256-1024 Psr 22 56 56.390 -10 24 34.37           ~ 88 0

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