2025ApJ...982..203C

Query : 2025ApJ...982..203C

2025ApJ...982..203C - Astrophys. J., 982, 203 (2025/April-1)

The Host Galaxy of FRB 20190520B and Its Unique Ionized Gas Distribution.

CHEN X.-L., TSAI C.-W., STERN D., BOCHENEK C.D., CHATTERJEE S., LAW C., LI D., NIU C.-H., NIINO Y., FENG Y., WANG P., ASSEF R.J., LI G.-D., LAKE S.E., LUO G. and LIAO M.

Abstract (from CDS):

The properties of host galaxies associated with fast radio bursts (FRBs) provide critical information for inferring the progenitors and radiation mechanisms of these bursts. We report on the host galaxy of the repeating FRB 20190520B, a dwarf galaxy at the spectroscopic redshift z = 0.241 with a stellar mass of (6.2 ± 0.8) × 108M⊙. The emission-line ratios suggest that the ionized gas is powered by star formation. The total Hα-traced star formation rate (SFR) is 0.70 ± 0.01 M⊙ yr–1, and the metallicity is $12+{{\rm{log}}}_{10}([{\rm{O}}/{\rm{H}}])\geqslant 7.4\pm 0.1$. The specific star formation rate (sSFR) is ${\rm{log}}\,{{\rm{sSFR/yr}}}^{-1}=-9.0\pm 0.1$, higher than the upper limit of -9.4 observed in nearby dwarf galaxies. The dispersion measure (DM) contribution from the host galaxy is estimated to be DMhost ≈ 950 ± 220 pc cm–3, based on the Hα emission. The FRB and the associated persistent radio source are located at the Hα emission peak, offset by ∼1$\mathop{.}\limits^{{\rm{^{\prime} }}}$4 (5.5 kpc) in projection from the stellar continuum. At this position, the lower limit of $\mathrm{log}\,\mathrm{sSFR}/{\mathrm{yr}}^{-1}$ is -8.5 ± 0.1, more than 3 times the galaxy's total sSFR. The Hα velocity difference between the stellar continuum and the offset gas is 39.6 ± 0.4 km s–1, which is sufficient to draw conclusions about the nature of the offset.

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

Journal keyword(s): Radio transient sources - Dwarf galaxies - Starburst galaxies

Simbad objects: 42

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Number of rows : 42
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 FRB 20221116A rB 01 24 50.450 +72 39 14.10           ~ 14 0
2 FRB 20180916B rB 01 58 00.750 +65 43 00.30           ~ 457 0
3 FRB 200906 rB 03 33 59.08 -14 04 59.5           ~ 43 0
4 FRB 20221113A rB 04 45 38.640 +70 18 26.60           ~ 14 0
5 FRB 20220726A rB 04 55 46.960 +69 55 44.80           ~ 16 0
6 FRB 20201124A rB 05 07 57.600 +26 11 24.00           ~ 307 0
7 FRB 20181119D rB 05 31 58.6980 +33 08 52.588           ~ 933 0
8 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
9 FRB 180301 rB 06 12 43.40 +04 33 44.8           ~ 125 0
10 FRB 20231120A rB 09 35 56.150 +73 17 04.80           ~ 16 0
11 FRB 20220330D rB 10 55 00.300 +70 21 02.70           ~ 15 0
12 FRB 20230628A rB 11 07 08.810 +72 16 54.64           ~ 16 0
13 FRB 20230307A rB 11 51 07.520 +71 41 44.30           ~ 14 0
14 FRB 190714 rB 12 15 55.1 -13 01 16           ~ 64 0
15 FRB 200430 rB 15 18 49.54 +12 22 36.8           ~ 59 0
16 FRB 20230124A rB 15 27 39.900 +70 58 05.20           ~ 15 0
17 FRB 20230626A rB 15 42 31.100 +71 08 00.77           ~ 14 0
18 BD+33 2642 pA* 15 51 59.8854348048 +32 56 54.329485272 9.806 10.61 10.73 10.884 10.961 O7p 456 0
19 FRB 20220920A rB 16 01 01.700 +70 55 07.68           ~ 28 0
20 FRB 20190520B rB 16 02 04.270 -11 17 17.32           ~ 211 0
21 EQ J160204.3-111718.5 G 16 02 04.31 -11 17 18.5           ~ 9 0
22 FRB 20231123B rB 16 10 09.160 +70 47 06.20           ~ 14 0
23 SN 2010md SN* 16 37 47.00 +06 12 32.3           SLSN-I 110 1
24 NAME Sgr 1935+2154 * 19 34 55.68 +21 53 48.2           ~ 820 1
25 FRB 200428 rB 19 35.0 +21 57           ~ 291 0
26 FRB 20220207C rB 20 40 47.890 +72 52 56.38           ~ 29 0
27 FRB 20220506D rB 21 12 10.760 +72 49 38.20           ~ 24 0
28 FRB 190611 rB 21 22 58.91 -79 23 51.3           ~ 82 0
29 FRB 20240114A rB 21 27 39.8350 +04 19 45.634           ~ 66 0
30 FRB 190102 rB 21 29 39.76 -79 28 32.5           ~ 83 0
31 FRB 20220208A rB 21 30 18.030 +70 02 27.75           ~ 15 0
32 FRB 191001 rB 21 33 24.373 -54 44 51.40           ~ 64 0
33 FRB 20210410D rB 21 44 20.70 -79 19 05.5           ~ 23 0
34 FRB 180924 rB 21 44 25.255 -40 54 00.10           ~ 140 0
35 FRB 181112 rB 21 49 23.630 -52 58 15.39           ~ 131 0
36 FRB 190608 rB 22 16 04.74 -07 53 53.6           ~ 102 0
37 FRB 20210117A rB 22 39 55.015 -16 09 05.45           ~ 49 0
38 FRB 20230501A rB 22 40 06.520 +70 55 19.82           ~ 14 0
39 FRB 20221101B rB 22 48 51.890 +70 40 52.20           ~ 18 0
40 FRB 191228 rB 22 57 43.30 -29 35 38.7           ~ 37 0
41 FRB 20220912A rB 23 09 04.9 +48 42 25           ~ 126 0
42 FRB 20220307B rB 23 23 29.880 +72 11 32.59           ~ 26 0

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