2025ApJ...985...91W

Query : 2025ApJ...985...91W

2025ApJ...985...91W - Astrophys. J., 985, 91 (2025/May-3)

Kiloparsec-scale Neutral Iron Kα Emission in the Starburst-AGN NGC 4945: A Relic AGN Outflow?

WEAVER K.A., CANN J.M., VALENCIC L., McCARTHY M., PFEIFLE R.W., KUNTZ K.D., CAMPBELL J.F., ENGLE K., TANNER R., HODGES-KLUCK E. and CARLTON I.

Abstract (from CDS):

NGC 4945 contains a well-known heavily obscured active galactic nucleus (AGN) at its core, with prior reports of strong nuclear and off-nuclear neutral Fe Kα emission due to the AGN activity. We report the discovery of very extended Fe Kα emission with the XMM-Newton EPIC pn in a ∼5 kpc by ∼10 kpc region that is misaligned with the plane of the inclined optical galactic disk by ∼60° in projection. After a careful consideration of the crowded center of the galaxy and numerous unresolved hard X-ray sources present, we estimate that ∼15% of the Fe Kα is extended on kiloparsec-sized scales. The overall size and misalignment of the region follows an unusual pattern of radio polarization that is not typical of starbursts or normal disk galaxies but has been interpreted as possibly due to AGN activity. We suggest that the extended Fe Kα emission arose from a period of AGN eruption several million years ago-a relic of a past AGN ejection episode.

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

Journal keyword(s): Active galaxies

Simbad objects: 22

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Number of rows : 22
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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
2 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
3 MCG-05-18-002 Sy2 07 16 31.2062162520 -29 19 28.882826364   13.28 13.52 11.61   ~ 288 4
4 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
5 CXOGSG J130518.5-492823 X 13 05 18.5 -49 28 24           ~ 3 0
6 CXOGSG J130521.1-492740 X 13 05 21.2 -49 27 41           ~ 3 0
7 CXOGSG J130522.2-492912 X 13 05 22.2 -49 29 13           ~ 2 0
8 CXOGSG J130522.5-492934 X 13 05 22.5 -49 29 35           ~ 2 0
9 CXOGSG J130522.6-492752 X 13 05 22.7 -49 27 53           ~ 2 0
10 CXOGSG J130522.8-492901 ULX 13 05 22.92 -49 29 02.4           ~ 7 0
11 CXOGSG J130524.3-492721 X 13 05 24.3 -49 27 22           ~ 2 0
12 2CXO J130525.4-492831 X 13 05 25.49 -49 28 31.9           ~ 3 0
13 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
14 CXOGSG J130532.8-492733 ULX 13 05 32.89 -49 27 34.1           ~ 14 1
15 CXOGSG J130535.4-492911 X 13 05 35.53 -49 29 11.0           ~ 2 0
16 CXOGSG J130538.0-492545 X 13 05 38.1 -49 25 45           ~ 2 0
17 2CXO J130540.7-492603 X 13 05 40.75 -49 26 02.7           ~ 4 0
18 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1331 1
19 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1734 2
20 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
21 NGC 7212a Sy1 22 07 01.9870259424 +10 14 00.838175892   15.1       ~ 217 1
22 NAME Local Group GrG ~ ~           ~ 9325 0

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