2000ApJ...538..594F

Query : 2000ApJ...538..594F

2000ApJ...538..594F - Astrophys. J., 538, 594-607 (2000/August-1)

Age, evolution, and dispersion of the loose groups of blue stars in the northeast radio lobe of Centaurus A.

FASSETT C.I. and GRAHAM J.A.

Abstract (from CDS):

The association of shocked gas and loose groups of young stars in the northeast radio lobe of Centaurus A (NGC 5128) provides direct evidence for shock-induced star formation. In this paper, we present UBV photometry of the blue stars based on observations made with the 2.5 m du Pont Telescope at Las Campanas Observatory. In a field covering 8'.8x8'.8, three groups are identified. Color-magnitude and color-color diagrams are plotted for each group. Two-color photometry of the many foreground field stars belonging to our own Galaxy indicates a foreground reddening EB–V=0.14 mag±0.02 mag. The new photometry is compared with that carried out in a small section of the field with the Hubble Space Telescope. The HST frames, in conjunction with the ground-based material allow compact star clusters to be identified, some of which are exciting small H II regions. Positions, finding charts, and photometry are given for 50 stars with V<23.0 mag and (B-V)<0.4 mag. The brightest blue star, at V=19.94 mag, has an estimated absolute visual magnitude MV=-8.2 mag, which is comparable to that of the brightest A-type supergiants in the Large Magellanic Cloud. Most of the blue stars lie just inside the 1.4 GHz contours of the large-scale jetlike feature recently detected by Morganti et al. It is suggested that rather than being a component of the jet that powers the radio lobes, this feature, which resembles a spiral arm of a normal galaxy, results from compression of ambient gas by the jet. Bolometric magnitudes and effective temperatures are derived for the bright blue stars and plotted. Isochrones based on the Geneva evolutionary tracks are fitted and indicate a significant age spread for the stars extending up to 15 million years. The older stars are distributed more widely than the younger stars indicating that star formation extends over time and that the blue stars eventually disperse into the extended stellar envelope of the galaxy.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - galaxies: individual (Centaurus A, NGC 5128) - Stars: Formation

Nomenclature: Table 3: [FG2000b] NN (Nos 1-50).

CDS comments: Table 1: [ZHG90b] NGC 5128 NN

Simbad objects: 74

goto Full paper

goto View the references in ADS

Number of rows : 74
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 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
2 BGLO Cen A Knot D PoC 13 25 33.24 -43 00 16.1           ~ 10 0
3 [ZHG90b] NGC 5128 6 * 13 25 43.9 -42 43 08   18.66 18.11     ~ 2 0
4 [ZHG90b] NGC 5128 16 * 13 25 44.4 -42 43 18   22.47 21.74     ~ 2 0
5 [ZHG90b] NGC 5128 13 * 13 25 44.6 -42 44 25     21.44     ~ 2 0
6 [ZHG90b] NGC 5128 15 * 13 25 45.8 -42 43 11     21.71     ~ 2 0
7 [ZHG90b] NGC 5128 9 * 13 25 46.2 -42 43 36   20.21 19.18     ~ 2 0
8 [ZHG90b] NGC 5128 5 * 13 25 46.3 -42 44 36   18.46 17.58     ~ 2 0
9 [ZHG90b] NGC 5128 21 * 13 25 47.0 -42 44 17     22.71     ~ 2 0
10 [ZHG90b] NGC 5128 20 * 13 25 47.9 -42 44 49     22.58     ~ 2 0
11 [ZHG90b] NGC 5128 1 * 13 25 49.2 -42 44 28   14.90 14.23     ~ 2 0
12 [ZHG90b] NGC 5128 12 * 13 25 49.7 -42 42 58   22.10 20.98     ~ 2 0
13 [ZHG90b] NGC 5128 11 * 13 25 49.9 -42 43 55   22.45 20.80     ~ 2 0
14 [ZHG90b] NGC 5128 17 * 13 25 50.1 -42 42 48     21.79     ~ 2 0
15 [ZHG90b] NGC 5128 18 * 13 25 50.2 -42 44 40   22.10       ~ 2 0
16 [ZHG90b] NGC 5128 2 * 13 25 50.2 -42 43 07   16.46 15.32     ~ 2 0
17 [ZHG90b] NGC 5128 14 * 13 25 50.3 -42 42 58     21.69     ~ 2 0
18 [ZHG90b] NGC 5128 8 * 13 25 50.7953945064 -42 44 14.224683372   19.37 18.33     ~ 2 0
19 [ZHG90b] NGC 5128 19 * 13 25 50.8 -42 44 31     22.18     ~ 2 0
20 [ZHG90b] NGC 5128 7 * 13 25 51.2 -42 43 39   19.01 18.18     ~ 2 0
21 [ZHG90b] NGC 5128 4 * 13 25 52.1 -42 44 44   17.88 17.12     ~ 2 0
22 [ZHG90b] NGC 5128 10 * 13 25 52.6 -42 44 03   21.03 20.00     ~ 2 0
23 [FG2000b] 2 * 13 25 58.1 -42 49 37   20.62 20.63     ~ 1 0
24 [FG2000b] 39 * 13 26 01.1 -42 09 52   22.57 22.69     ~ 3 0
25 [FG2000b] 46 * 13 26 06.5 -42 50 38   23.20 22.89     ~ 2 0
26 [FG2000b] 42 * 13 26 07.7 -42 40 04   22.82 22.82     ~ 2 0
27 [G81b] 10 * 13 26 08.5 -42 44 48   17.30 16.55     ~ 3 0
28 [FG2000b] 45 * 13 26 11.9 -42 48 05   23.27 22.88     ~ 1 0
29 [FG2000b] 29 * 13 26 13.4 -42 47 32   22.43 22.43     ~ 1 0
30 [FG2000b] 44 * 13 26 14.6 -42 47 26   23.03 22.83     ~ 1 0
31 [FG2000b] 43 * 13 26 14.8 -42 47 19           ~ 1 0
32 [FG2000b] 25 * 13 26 15.3 -42 47 31   22.45 22.20     ~ 1 0
33 [FG2000b] 3 * 13 26 15.5 -42 48 04   21.04 20.84     ~ 1 0
34 [FG2000b] 22 * 13 26 15.6 -42 47 23   22.49 22.13     ~ 1 0
35 [FG2000b] 14 * 13 26 16.1 -42 48 10   22.10 21.84     ~ 1 0
36 [FG2000b] 40 * 13 26 16.1 -42 46 58   23.00 22.73     ~ 1 0
37 [FG2000b] 31 * 13 26 16.2 -42 46 57   22.67 22.52     ~ 1 0
38 [FG2000b] 23 * 13 26 16.3 -42 46 59   22.37 22.16     ~ 1 0
39 [FG2000b] 19 * 13 26 16.4 -42 48 02   22.29 22.02     ~ 1 0
40 [FG2000b] 9 * 13 26 16.4 -42 48 01   21.70 21.53     ~ 1 0
41 [FG2000b] 11 * 13 26 16.4 -42 47 15   21.71 21.67     ~ 1 0
42 [FG2000b] 38 * 13 26 16.6 -42 46 10   22.78 22.67     ~ 1 0
43 [FG2000b] 24 * 13 26 16.9 -42 47 01   22.42 22.21     ~ 1 0
44 [FG2000b] 41 * 13 26 17.1 -42 47 48   22.85 22.78     ~ 1 0
45 [FG2000b] 18 * 13 26 17.4 -42 48 42   22.31 22.01     ~ 2 0
46 [FG2000b] 33 * 13 26 19.7 -42 51 37   22.61 22.54     ~ 2 0
47 [FG2000b] 4 GlC 13 26 19.88 -42 49 11.5   21.19 21.07     ~ 5 0
48 [FG2000b] 30 * 13 26 20.3 -42 50 23   22.51 22.71     ~ 2 0
49 [FG2000b] 34 * 13 26 20.7 -42 44 33   22.71 22.55     ~ 1 0
50 [FG2000b] 47 * 13 26 20.8 -42 50 21   22.85 22.90     ~ 2 0
51 [FG2000b] 13 * 13 26 21.0 -42 49 51   21.86 21.75     ~ 2 0
52 [FG2000b] 10 * 13 26 21.1 -42 49 45   21.71 21.65     ~ 3 0
53 [FG2000b] 35 * 13 26 21.2 -42 51 10   22.66 22.55     ~ 2 0
54 [FG2000b] 36 * 13 26 21.2 -42 49 42   22.50 22.58     ~ 2 0
55 [FG2000b] 1 * 13 26 21.3 -42 48 53   20.17 19.94     ~ 3 0
56 [FG2000b] 17 * 13 26 21.4 -42 49 10   22.29 21.95     ~ 2 0
57 [FG2000b] 26 * 13 26 21.4 -42 49 01   22.33 22.25     ~ 3 0
58 [FG2000b] 12 * 13 26 21.4 -42 50 22   21.93 21.72     ~ 3 0
59 [FG2000b] 50 * 13 26 21.4 -42 49 00   22.95 22.99     ~ 2 0
60 [FG2000b] 37 * 13 26 21.6 -42 49 09   22.60 22.58     ~ 2 0
61 [FG2000b] 27 * 13 26 21.6 -42 49 00   22.32 22.25     ~ 3 0
62 [FG2000b] 49 * 13 26 22.1 -42 47 43   23.06 22.96     ~ 1 0
63 [FG2000b] 28 * 13 26 22.2 -42 49 31   22.35 22.40     ~ 3 0
64 [FG2000b] 48 * 13 26 22.8 -42 50 44   23.04 22.96     ~ 2 0
65 [FG2000b] 15 * 13 26 23.1 -42 50 47   21.95 21.86     ~ 2 0
66 [FG2000b] 32 * 13 26 23.5 -42 48 43   22.66 22.53     ~ 2 0
67 [FG2000b] 6 * 13 26 24.9 -42 48 09   21.78 21.47     ~ 1 0
68 [FG2000b] 20 * 13 26 26.0 -42 50 32   22.17 22.10     ~ 2 0
69 [FG2000b] 8 * 13 26 26.4 -42 45 19   21.63 21.52     ~ 1 0
70 [FG2000b] 16 * 13 26 27.3 -42 50 15   20.89 21.94     ~ 3 0
71 [FG2000b] 21 * 13 26 28.0 -42 50 12   22.04 22.12     ~ 2 0
72 [FG2000b] 7 * 13 26 28.1 -42 50 05   21.44 21.51     ~ 3 0
73 [FG2000b] 5 GlC 13 26 28.27 -42 50 03.9   21.23 21.19     ~ 3 0
74 BGLO Cen A Knot X PoG ~ ~           ~ 3 0

To bookmark this query, right click on this link: simbad:objects in 2000ApJ...538..594F and select 'bookmark this link' or equivalent in the popup menu