2012MNRAS.421.1603C

Query : 2012MNRAS.421.1603C

2012MNRAS.421.1603C - Mon. Not. R. Astron. Soc., 421, 1603-1623 (2012/April-1)

Triggered star formation in the inner filament of Centaurus A.

CROCKETT R.M., SHABALA S.S., KAVIRAJ S., ANTONUCCIO-DELOGU V., SILK J., MUTCHLER M., O'CONNELL R.W., REJKUBA M., WHITMORE B.C. and WINDHORST R.A.

Abstract (from CDS):

We present recent Hubble Space Telescope observations of the inner filament of Centaurus A, using the new Wide Field Camera 3 (WFC3) F225W, F657N and F814W filters. We find a young stellar population near the south-west tip of the filament. Combining the WFC3 data set with archival Advanced Camera for Surveys (ACS) F606W observations, we are able to constrain the ages of these stars to ≲ 10 Myr, with best-fitting ages of 1–4 Myr. No further recent star formation is found along the filament.

Based on the location and age of this stellar population, and the fact that there is no radio lobe or jet activity near the star formation, we propose an updated explanation for the origin of the inner filament. Sutherland et al. suggested that radio jet-induced shocks can drive the observed optical line emission. We argue that such shocks can naturally arise due to a weak cocoon-driven bow shock (rather than from the radio jet directly), propagating through the diffuse interstellar medium from a location near the inner northern radio lobe. The shock can overrun a molecular cloud, triggering star formation in the dense molecular cores. Ablation and shock heating of the diffuse gas then give rise to the observed optical line and X-ray emission. Deeper X-ray observations should show more diffuse emission along the filament.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): galaxies: active - galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 5128 - intergalactic medium - galaxies: jets - ultraviolet: galaxies

Nomenclature: Table A1: [CSK2012] NNN (Nos 1-111).

Simbad objects: 119

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Number of rows : 119
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 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
2 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
3 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
4 BGLO Cen A Knot A PoC 13 25 29.36 -43 00 53.0           ~ 20 0
5 BGLO Cen A Knot B PoC 13 25 32.5 -43 00 36           ~ 19 0
6 BGLO Cen A Knot C PoC 13 25 33.46 -43 00 28.0           ~ 16 0
7 [CSK2012] 78 UV 13 25 56.9431083600 -42 56 39.261408540         16.98 ~ 1 0
8 [CSK2012] 65 UV 13 25 57.128 -42 56 56.52     21.01   20.33 ~ 1 0
9 [CSK2012] 82 UV 13 25 57.3100539864 -42 56 30.212849040     20.10   19.36 ~ 1 0
10 [CSK2012] 64 UV 13 25 57.687 -42 56 56.84     23.15   23.02 ~ 1 0
11 [CSK2012] 56 * 13 25 58.1439846792 -42 57 06.455846988         17.49 ~ 1 0
12 [CSK2012] 98 UV 13 25 58.745 -42 56 20.31     25.30   24.91 ~ 1 0
13 [CSK2012] 77 UV 13 25 58.771 -42 56 40.10     25.09   24.69 ~ 1 0
14 [CSK2012] 62 UV 13 25 59.050 -42 56 58.89     24.50   24.43 ~ 1 0
15 [CSK2012] 61 UV 13 25 59.159 -42 57 01.92     25.02   24.90 ~ 1 0
16 [CSK2012] 89 UV 13 25 59.278 -42 56 23.75     23.50   23.44 ~ 1 0
17 [CSK2012] 96 UV 13 25 59.297 -42 56 21.17     23.76   23.64 ~ 1 0
18 [GF2002] Blue 24 * 13 25 59.310 -42 56 24.91   22.46 22.65   22.65 ~ 3 0
19 [CSK2012] 97 UV 13 25 59.357 -42 56 20.67     24.47   24.64 ~ 1 0
20 [CSK2012] 91 UV 13 25 59.385 -42 56 22.63     25.04   24.98 ~ 1 0
21 [CSK2012] 93 UV 13 25 59.388 -42 56 23.26     25.96   25.85 ~ 1 0
22 [CSK2012] 60 UV 13 25 59.413 -42 57 02.50     24.52   24.43 ~ 1 0
23 [CSK2012] 86 UV 13 25 59.413 -42 56 25.06     25.08   25.13 ~ 1 0
24 [CSK2012] 84 UV 13 25 59.533 -42 56 27.51     24.45   24.09 ~ 1 0
25 [CSK2012] 92 UV 13 25 59.546 -42 56 22.42     26.17   26.06 ~ 1 0
26 [CSK2012] 76 UV 13 25 59.577 -42 56 45.09     21.38   20.59 ~ 1 0
27 [CSK2012] 90 UV 13 25 59.597 -42 56 23.20     25.32   25.56 ~ 1 0
28 [CSK2012] 63 UV 13 25 59.644 -42 56 58.28     24.60   24.74 ~ 1 0
29 [CSK2012] 85 UV 13 25 59.684 -42 56 25.06     25.37   25.28 ~ 1 0
30 [CSK2012] 95 UV 13 25 59.699 -42 56 21.36     23.93   23.99 ~ 1 0
31 [CSK2012] 68 UV 13 25 59.748 -42 56 53.16     25.18   25.14 ~ 1 0
32 [CSK2012] 70 UV 13 26 00.028 -42 56 51.07     26.38   25.57 ~ 1 0
33 [CSK2012] 72 UV 13 26 00.079 -42 56 49.87     24.97   24.94 ~ 1 0
34 [CSK2012] 35 UV 13 26 00.483 -42 57 46.39     24.98   24.95 ~ 1 0
35 [CSK2012] 66 UV 13 26 00.489 -42 56 55.08     25.36   25.61 ~ 1 0
36 [CSK2012] 73 UV 13 26 00.573 -42 56 49.71     23.08   22.88 ~ 1 0
37 [CSK2012] 57 UV 13 26 00.599 -42 57 03.44     23.71   23.56 ~ 1 0
38 [CSK2012] 36 UV 13 26 00.606 -42 57 44.40     25.46   25.46 ~ 1 0
39 [CSK2012] 43 UV 13 26 01.164 -42 57 23.88     25.25   24.74 ~ 1 0
40 [WRW2015] 756 UV 13 26 01.5201172392 -42 57 35.512304724     19.76   18.97 ~ 2 0
41 [CSK2012] 45 UV 13 26 01.534 -42 57 22.67     25.36   25.19 ~ 1 0
42 [CSK2012] 34 UV 13 26 01.5684552984 -42 57 46.767832704         16.91 ~ 1 0
43 [CSK2012] 46 UV 13 26 01.636 -42 57 21.04     25.17   25.36 ~ 1 0
44 [CSK2012] 39 UV 13 26 01.8721734504 -42 57 33.331985352         16.60 ~ 1 0
45 [CSK2012] 59 UV 13 26 02.016 -42 57 02.87     25.46   24.93 ~ 1 0
46 [CSK2012] 58 UV 13 26 02.1574383072 -42 57 03.338860428     20.61   19.91 ~ 1 0
47 [CSK2012] 41 UV 13 26 02.7035877024 -42 57 28.318070376     19.94   19.22 ~ 1 0
48 [CSK2012] 23 UV 13 26 02.856 -42 57 21.09     26.02   26.00 ~ 1 0
49 [CSK2012] 25 UV 13 26 02.856 -42 57 20.73     25.38   24.73 ~ 1 0
50 [CSK2012] 29 UV 13 26 02.877 -42 57 19.41     25.71   24.04 ~ 1 0
51 [CSK2012] 28 UV 13 26 02.878 -42 57 19.73     23.53   23.64 ~ 1 0
52 [CSK2012] 26 UV 13 26 02.887 -42 57 20.46     23.03   23.09 ~ 1 0
53 [CSK2012] 27 UV 13 26 02.889 -42 57 19.93     26.28   26.22 ~ 1 0
54 [CSK2012] 24 UV 13 26 02.904 -42 57 20.80     25.99   27.27 ~ 1 0
55 [CSK2012] 21 UV 13 26 02.940 -42 57 21.80     24.64   24.50 ~ 1 0
56 [CSK2012] 22 UV 13 26 02.968 -42 57 21.54     25.65   25.75 ~ 1 0
57 [CSK2012] 75 UV 13 26 03.1305527544 -42 56 49.008702840         16.82 ~ 1 0
58 [CSK2012] 10 UV 13 26 03.207 -42 57 18.31     24.65   24.81 ~ 1 0
59 [CSK2012] 1 UV 13 26 03.253 -42 57 19.36     24.68   24.62 ~ 1 0
60 [CSK2012] 9 UV 13 26 03.264 -42 57 18.34     25.87   26.50 ~ 1 0
61 [CSK2012] 2 UV 13 26 03.264 -42 57 19.18     24.33   24.21 ~ 1 0
62 [CSK2012] 4 UV 13 26 03.274 -42 57 18.88     24.28   24.35 ~ 1 0
63 [CSK2012] 5 UV 13 26 03.282 -42 57 18.94     24.61   25.00 ~ 1 0
64 [CSK2012] 6 UV 13 26 03.297 -42 57 18.58     24.42   24.77 ~ 1 0
65 [CSK2012] 3 UV 13 26 03.304 -42 57 19.04     23.44   23.60 ~ 1 0
66 [CSK2012] 8 UV 13 26 03.320 -42 57 18.36     24.83   24.87 ~ 1 0
67 [CSK2012] 11 UV 13 26 03.325 -42 57 18.23     24.39   24.53 ~ 1 0
68 [CSK2012] 7 UV 13 26 03.328 -42 57 18.38     25.70   25.61 ~ 1 0
69 [CSK2012] 20 UV 13 26 03.332 -42 57 17.28     24.61   24.73 ~ 1 0
70 [CSK2012] 88 UV 13 26 03.3564241824 -42 56 24.081344196           ~ 1 0
71 [CSK2012] 53 UV 13 26 03.3603702600 -42 57 10.881308592         17.61 ~ 1 0
72 [CSK2012] 14 UV 13 26 03.4252874904 -42 57 17.633001240     24.43   24.68 ~ 1 0
73 [CSK2012] 17 UV 13 26 03.4252874904 -42 57 17.633001240     23.72   23.71 ~ 1 0
74 [CSK2012] 16 UV 13 26 03.4252874904 -42 57 17.633001240     21.14   21.13 ~ 1 0
75 [CSK2012] 13 UV 13 26 03.4252874904 -42 57 17.633001240     24.75   25.09 ~ 1 0
76 [CSK2012] 12 UV 13 26 03.4252874904 -42 57 17.633001240     22.46   22.38 ~ 1 0
77 [CSK2012] 18 UV 13 26 03.4252874904 -42 57 17.633001240     23.39   23.80 ~ 1 0
78 [CSK2012] 15 UV 13 26 03.4252874904 -42 57 17.633001240     21.45   21.25 ~ 1 0
79 [CSK2012] 19 UV 13 26 03.4252874904 -42 57 17.633001240     24.28   24.24 ~ 1 0
80 [CSK2012] 30 UV 13 26 03.538 -42 58 38.93         23.64 ~ 1 0
81 [CSK2012] 103 UV 13 26 03.6638973192 -42 56 09.395056536           ~ 1 0
82 [CSK2012] 32 UV 13 26 03.7319619144 -42 58 02.397750420           ~ 1 0
83 [HGH92] G293 GlC 13 26 04.1792886816 -42 55 44.696977572 20.11 19.90 19.04 18.61 18.22 ~ 14 0
84 [CSK2012] 48 UV 13 26 04.809 -42 57 16.76     25.60   25.62 ~ 1 0
85 [CSK2012] 49 UV 13 26 04.841 -42 57 16.05     23.95   24.18 ~ 1 0
86 [CSK2012] 105 * 13 26 05.2427859168 -42 55 59.028967164           ~ 1 0
87 [CSK2012] 104 UV 13 26 05.352 -42 56 00.29     20.03   18.96 ~ 1 0
88 [VHH81] 7 GlC 13 26 05.3936216880 -42 56 32.376406056 18.38 18.03 17.17 16.65 16.23 ~ 42 0
89 [CSK2012] 99 UV 13 26 05.6636916528 -42 56 19.078699380     19.57   18.60 ~ 1 0
90 [CSK2012] 71 UV 13 26 05.8215888024 -42 56 50.272218024         16.38 ~ 1 0
91 [CSK2012] 52 UV 13 26 05.8520705376 -42 57 11.358248220     19.40   18.65 ~ 1 0
92 [CSK2012] 101 UV 13 26 05.9842565712 -42 56 11.554736928           ~ 1 0
93 [CSK2012] 80 UV 13 26 06.155 -42 56 33.57     23.77   23.89 ~ 1 0
94 [CSK2012] 44 UV 13 26 06.314 -42 57 23.22         24.78 ~ 1 0
95 [CSK2012] 107 UV 13 26 06.6212789688 -42 55 56.806411836         17.81 ~ 1 0
96 [CSK2012] 111 UV 13 26 06.737 -42 55 34.92     27.21   25.90 ~ 1 0
97 [CSK2012] 83 UV 13 26 06.849 -42 56 28.96     25.26   24.84 ~ 1 0
98 [CSK2012] 42 UV 13 26 06.9720268152 -42 57 23.963184216           ~ 1 0
99 [HFC93] 5101 PN 13 26 07.384 -42 58 07.24         24.72 ~ 4 0
100 [GF2002] Blue 22 * 13 26 07.718 -42 56 10.24   22.65 22.60   22.45 ~ 2 0
101 2MASS J13260800-4255443 * 13 26 08.0045515440 -42 55 44.293313784           ~ 1 0
102 [CSK2012] 74 UV 13 26 08.224 -42 56 49.50     24.13   23.69 ~ 1 0
103 [CSK2012] 94 UV 13 26 08.3633356992 -42 56 22.162468956         17.39 ~ 1 0
104 [CSK2012] 55 UV 13 26 08.780 -42 57 07.60         21.34 ~ 1 0
105 [CSK2012] 33 UV 13 26 09.2530934592 -42 57 58.689274140         18.83 ~ 1 0
106 [CSK2012] 47 UV 13 26 09.319 -42 57 19.63         20.52 ~ 1 0
107 [CSK2012] 100 UV 13 26 09.9604354080 -42 56 14.692921764         18.38 ~ 1 0
108 [CSK2012] 108 UV 13 26 10.0862617392 -42 55 55.777656900         17.95 ~ 1 0
109 [CSK2012] 106 UV 13 26 10.200 -42 55 58.07     19.65   18.88 ~ 1 0
110 [CSK2012] 69 UV 13 26 10.2849838344 -42 56 51.282498408         17.90 ~ 1 0
111 [CSK2012] 54 UV 13 26 11.240 -42 57 07.72         23.14 ~ 1 0
112 [CSK2012] 50 UV 13 26 11.4183393168 -42 57 15.368783220         18.31 ~ 1 0
113 [CSK2012] 67 UV 13 26 12.1296106800 -42 56 55.009803624         17.16 ~ 1 0
114 [CSK2012] 79 UV 13 26 12.608 -42 56 34.21         25.49 ~ 1 0
115 [CSK2012] 37 UV 13 26 13.163 -42 57 37.06         20.92 ~ 1 0
116 2MASS J13261414-4257136 * 13 26 14.1494196648 -42 57 13.638951648           ~ 1 0
117 [CSK2012] 40 UV 13 26 15.019 -42 57 28.38         25.09 ~ 1 0
118 BGLO Cen A Knot F PoG ~ ~           ~ 13 0
119 BGLO Cen A Knot E PoG ~ ~           ~ 12 0

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