2025ApJ...980...13T

Query : 2025ApJ...980...13T

2025ApJ...980...13T - Astrophys. J., 980, 13 (2025/February-2)

Rare Occasions: Tidal Disruption Events Rarely Power the AGNs Observed in Dwarf Galaxies.

TAN J., YANG G., WALSH J.L., BRANDT W.N., LUO B., BAUER F.E., CHEN C.-T., SUN M. and XUE Y.

Abstract (from CDS):

Tidal disruption events (TDEs) could be an important growth channel for massive black holes in dwarf galaxies. Theoretical work suggests that the observed active galactic nuclei (AGNs) in dwarf galaxies are predominantly TDE-powered. To assess this claim, we perform variability analyses on the dwarf-hosted AGNs detected in the 7 Ms Chandra Deep Field-South survey, with observations spanning ≈16 yr. Based on the spectral energy distribution modeling with X-CIGALE, we select AGNs hosted by dwarf galaxies (stellar mass below 1010M⊙). We focus on X-ray sources with full-band detections, leading to a sample of 78 AGNs (0.122 ≤ z ≤ 3.515). We fit the X-ray light curves with a canonical TDE model of t–5/3 and a constant model. If the former outperforms the latter in fitting quality for a source, we consider the source as a potential TDE. We identify five potential TDEs, constituting a small fraction of our sample. Using true- and false-positive rates obtained from fitting models to simulated light curves, we perform Bayesian analysis to obtain the posterior of the TDE fraction for our sample. The posterior peaks close to zero (2.56%), and we obtain a 2σ upper limit of 9.80%. Therefore, our result indicates that the observed AGNs in dwarf galaxies are not predominantly powered by TDEs.

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

Journal keyword(s): Tidal disruption - AGN host galaxies - Dwarf galaxies - X-ray active galactic nuclei

Simbad objects: 82

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Number of rows : 82
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 [VV2006] J033201.6-274327 QSO 03 32 01.59 -27 43 27.3 24.86 24.5724 24.07 23.405 23.9921 ~ 52 0
2 CXOCDFS J033202.6-274525 AGN 03 32 02.6009 -27 45 24.466   27.148   26.37 25.350 ~ 19 0
3 CXOCDFS J033207.5-274943 rG 03 32 07.3544 -27 49 41.974   27.061   25.46 25.095 ~ 29 0
4 [LBX2017] 163 AGN 03 32 07.39 -27 48 51.1       24.33   ~ 9 0
5 [LBX2017] 173 AGN 03 32 08.399 -27 49 25.16           ~ 5 0
6 ZFOURGE CDFS 17772 AGN 03 32 08.8806 -27 47 06.872           ~ 8 0
7 CXOCDFS J033209.5-274754 AGN 03 32 09.59 -27 47 54.8   28.540     26.216 ~ 17 0
8 [LBX2017] 202 AGN 03 32 10.613 -27 47 09.65           ~ 4 0
9 CXOCDFS J033213.5-274857 AGN 03 32 13.405 -27 48 56.01   27.219 27.07   26.338 ~ 28 0
10 CXOCDFS J033214.1-275101 Sy2 03 32 13.98 -27 51 00.3   23.9234   22.61 21.809 ~ 50 0
11 ACS-GC 90042864 QSO 03 32 14.445 -27 44 56.60   24.6079 24.82 24.549 22.302 ~ 32 0
12 [LBX2017] 269 AGN 03 32 14.99 -27 45 53.4       23.19   ~ 10 0
13 CXOCDFS J033215.4-275038 rG 03 32 15.306 -27 50 36.71   25.872 27.28   23.627 ~ 25 0
14 [LBX2017] 288 AGN 03 32 16.017 -27 46 56.06           ~ 8 0
15 ZFOURGE CDFS 7784 AGN 03 32 16.4165 -27 51 59.307   26.4630   26.18 25.8636 ~ 13 0
16 [LBX2017] 309 AGN 03 32 17.18122 -27 48 53.4488   24.495   24.451   ~ 12 0
17 EIS-DEEP CDFS-3 J 1 1543 AGN 03 32 17.26 -27 52 09.3       22.677   ~ 13 0
18 [LBX2017] 324 AGN 03 32 18.070 -27 44 33.43   24.42 24.02 23.764   ~ 17 0
19 CANDELS UDS F160W J033218.24-275241.4 Sy1 03 32 18.2555 -27 52 41.418   24.5285 24.6214 24.102 24.2474 ~ 52 0
20 ACS-GC 90043051 Sy2 03 32 19.02 -27 47 55.7   26.460   24.525 23.664 ~ 51 0
21 GOODS J033219.02-275214.1 AGN 03 32 19.02161 -27 52 14.1193   24.96   24.82   ~ 9 0
22 ZFOURGE CDFS 26120 AGN 03 32 20.6689 -27 42 58.670           ~ 5 0
23 GEMS J033222.03-275428.4 rG 03 32 22.01957 -27 54 28.3111 22.31 20.4732   19.421 19.2600 ~ 26 0
24 CXOCDFS J033222.5-274544 AGN 03 32 22.4518 -27 45 43.892   28.2293     26.765 ~ 25 0
25 MUSE-WIDE 108025145 AGN 03 32 22.80235 -27 49 34.2872   23.344   23.628 22.75 ~ 12 0
26 [RNL2013] cdfs4Ms 345 AGN 03 32 24.651 -27 54 42.90   20.271   19.45 18.996 ~ 9 0
27 ACS-GC 90044892 Sy2 03 32 24.9576 -27 50 08.048   25.7039   25.08 24.202 ~ 42 0
28 GOODS-MUSIC 70033 AGN 03 32 25.024 -27 42 09.58   28.229 27.79   27.655 ~ 16 0
29 ACS-GC 90041437 Sy2 03 32 25.1059 -27 50 43.256   24.8238   24.08 22.938 ~ 47 0
30 [PBM2009] s124624 Sy1 03 32 25.21 -27 42 18.8   24.7725 23.75 23.21 22.6063 ~ 92 0
31 ZFOURGE CDFS 24336 AGN 03 32 25.62 -27 43 55.6           ~ 8 0
32 ZFOURGE CDFS 21246 AGN 03 32 26.0495 -27 45 26.072       26.78   ~ 9 0
33 VANDELS CDFS 004581 AGN 03 32 26.12 -27 52 06.8           ~ 12 0
34 ZFOURGE CDFS 5946 AGN 03 32 26.5210 -27 53 01.146           ~ 7 0
35 GOODS J033226.75-274810.8 AGN 03 32 26.7527 -27 48 10.755   27.5222     27.0186 ~ 11 0
36 ZFOURGE CDFS 24953 AGN 03 32 27.2983 -27 43 33.194       26.06   ~ 9 0
37 ACS-GC 90045102 AGN 03 32 27.58 -27 45 56.7   25.653   25.36 24.870 ~ 13 0
38 ZFOURGE CDFS 18406 AGN 03 32 27.8586 -27 46 48.799           ~ 8 0
39 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
40 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1623 1
41 [LBX2017] 546 AGN 03 32 29.722 -27 51 45.54   27.255 27.831 23.440 26.669 ~ 26 0
42 ZFOURGE CDFS 6078 AGN 03 32 29.7922 -27 52 53.188         26.854 ~ 10 0
43 ACS-GC 90042521 Sy1 03 32 30.2159 -27 45 04.590 23.17 22.5984 22.2969 21.958 21.7127 ~ 71 0
44 ZFOURGE CDFS 14209 AGN 03 32 30.9228 -27 48 49.793       27.09   ~ 8 0
45 UDF 3154 AGN 03 32 31.147 -27 47 56.85   27.2510 26.4364     ~ 14 0
46 GOODS-MUSIC 70220 AGN 03 32 31.309 -27 47 28.04   30.2961 27.72   27.026 ~ 18 0
47 [SWM2014] GOODS-S 48420 AGN 03 32 32.552 -27 40 58.23   24.5186 23.8786 23.363 23.1678 ~ 17 0
48 AUDFs F14141 AGN 03 32 33.043 -27 47 30.97 23.5938 23.5257 23.114 23.02 22.33 ~ 38 0
49 CXOCDFS J033233.2-274916 AGN 03 32 33.25 -27 49 16.3   27.628   26.16 25.300 ~ 19 0
50 GOODS-MUSIC 14551 AGN 03 32 33.779 -27 43 39.29   25.86 25.72 26.19   ~ 10 0
51 [SWM2014] GOODS-S 33721 AGN 03 32 33.84634 -27 45 20.6539   26.3521   25.31 25.106 ~ 37 0
52 [LBX2017] 631 AGN 03 32 33.912 -27 46 17.04 26.4325 26.0157 25.8538 25.74 25.28 ~ 17 0
53 [LBX2017] 635 AGN 03 32 33.988 -27 48 14.69   24.9637   24.700 24.4165 ~ 28 0
54 MUSE-WIDE 116003060 AGN 03 32 34.00596 -27 50 43.0886   25.273   25.65   ~ 11 0
55 MUSE-WIDE 123005089 rG 03 32 34.27 -27 49 40.3   26.786   26.01 25.086 ~ 21 0
56 [MAT2017] XDF 957 AGN 03 32 36.143 -27 46 17.71 22.6098 22.1901 21.599 21.280   ~ 30 0
57 ZFOURGE CDFS 10831 AGN 03 32 36.7428 -27 50 26.019           ~ 8 0
58 [LBX2017] 693 AGN 03 32 36.92446 -27 50 25.0076   25.078   24.583   ~ 12 0
59 ACS-GC 90042433 Sy1 03 32 37.45 -27 40 00.3   23.5237 22.9339 22.614 22.1550 ~ 53 0
60 PEARS 43170 AGN 03 32 37.49 -27 51 38.8   24.977   24.83 24.023 ~ 14 0
61 ACS-GC 90043401 Sy1 03 32 38.1232741056 -27 39 45.158278032 20.89 20.9342 20.511 20.4095 20.6297 ~ 69 0
62 [LBX2017] 736 AGN 03 32 39.17 -27 52 06.8       26.81   ~ 13 0
63 [SWM2014] GOODS-S 5205 AGN 03 32 39.4710 -27 53 11.804   24.3801   24.54 23.921 ~ 17 0
64 ACS-GC 90040555 QSO 03 32 39.50306 -27 53 25.3140   22.385 22.28 22.288 22.283 ~ 18 0
65 GOODS-MUSIC 11670 EmG 03 32 40.785 -27 46 06.02   25.6088 24.960 25.33   ~ 34 0
66 [HSN2014] 4983 AGN 03 32 41.01 -27 51 53.3   26.444   26.86 26.158 ~ 7 0
67 CXOCDFS J033242.9-274703 Sy1 03 32 42.837 -27 47 02.53   25.6384 24.571 24.100 24.311 ~ 81 0
68 GOODS-MUSIC 10479 AGN 03 32 44.206 -27 47 00.69 27.3985 26.4711 26.17     ~ 16 0
69 [LBX2017] 828 AGN 03 32 45.331 -27 49 56.29       24.90   ~ 4 0
70 [LBX2017] 847 AGN 03 32 47.110 -27 53 07.22           ~ 16 0
71 EIS-DEEP CDFS-2 J 1 520 AGN 03 32 48.8403 -27 45 31.497   22.9674 22.2829 21.611 21.5337 ~ 21 0
72 [SWM2014] GOODS-S 36673 AGN 03 32 49.197 -27 44 26.03   25.574   24.03 25.042 ~ 12 0
73 VANDELS CDFS 018969 AGN 03 32 49.93 -27 45 00.0       26.10 25.077 ~ 16 0
74 [LBX2017] 884 AGN 03 32 51.625 -27 51 57.67       25.89   ~ 6 0
75 [XLB2011] J033252.21-274826.6 AGN 03 32 52.209 -27 48 26.10       22.57   ~ 6 0
76 ACS-GC 90024818 AGN 03 32 52.3459 -27 45 56.570   24.13 23.95 23.61 22.790 ~ 26 0
77 GEMS J033252.85-275207.9 AGN 03 32 52.85950 -27 52 07.9068   25.0793 24.4099 23.871 23.2096 ~ 25 0
78 ZFOURGE CDFS 9307 AGN 03 32 55.20360 -27 51 02.8224   26.0425     24.8025 ~ 7 0
79 CXOCDFS J033256.8-275318 QSO 03 32 56.6570292528 -27 53 16.624989096 20.82 20.5562   19.874 20.2611 ~ 49 0
80 [LBX2017] 930 AGN 03 32 59.023 -27 52 18.31           ~ 3 0
81 SDSS J114726.69+494257.8 G 11 47 26.69774 +49 42 57.8329   17.43 17.10     ~ 26 0
82 2MASS J18472513-6317252 G 18 47 25.1287042560 -63 17 25.304943912     16.67   15.56 ~ 16 0

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