Table 5:
Colours and colour gradients of the BL Lac host galaxiesa.
|
Name |
U-B |
B-V |
B-R |
R-H |
 |
 |
 |
| (1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
|
1ES 0229+200 |
0.4 |
0.3 |
2.0 |
2.5 |
0.92 |
-0.44 |
-0.17 |
| PKS 0521-365 |
|
0.9 |
0.9 |
2.3 |
|
-1.02 |
-1.66 |
| PKS 0548-322 |
|
|
1.1 |
2.1 |
|
1.10 |
-0.90 |
| 1H 0706+591 |
0.9 |
0.8 |
1.3 |
2.2 |
-0.01 |
0.17 |
-0.12 |
| MRK 421 |
-0.2 |
|
2.2 |
2.2 |
0.17 |
-0.91 |
-0.31 |
| MRK 180 |
0.4 |
|
0.5 |
2.7 |
0.75 |
-1.24 |
-0.91 |
| 1ES 1212+078 |
|
|
1.9 |
2.2 |
|
0.48 |
-0.85 |
| MS 1229.2+6430 |
|
|
1.3 |
0.9 |
|
-0.12 |
-0.74 |
| 1ES 1255+244 |
|
|
0.9 |
2.1 |
|
-1.08 |
-0.91 |
| PG 1418+546 |
|
|
1.4 |
2.2 |
|
-0.21 |
0.86 |
| 1ES 1426+428 |
|
|
0.8 |
2.5 |
|
0.90 |
1.19 |
| 1ES 1440+122 |
|
|
1.6 |
2.4 |
|
0.16 |
-0.11 |
| AP LIBRAE |
-0.5 |
|
1.1 |
2.2 |
0.17 |
0.43 |
-0.31 |
| MS 1552.1+2020 |
|
|
0.5 |
2.7 |
|
-0.41 |
-0.37 |
| MRK 501 |
0.4 |
1.2 |
1.1 |
2.4 |
0.01 |
0.64 |
-0.62 |
| I Zw 187 |
0.5 |
1.1 |
1.2 |
2.3 |
0.63 |
-0.32 |
-0.54 |
| 3C 371 |
0.2 |
0.8 |
1.5 |
1.9 |
-0.44 |
-1.26 |
-1.51 |
| BL LACERTAE |
|
|
1.0 |
2.4 |
|
0.63 |
-1.70 |
|
a Column (1) gives the name of the object; (2) the U-B colour;
(3) the B-V colour; (4) the B-R colour; (5) the R-H colour
(from Kotilainen & Falomo 2004); (6) the U-B colour gradient;
(7) the B-R colour gradient and (8) the B-H colour gradient of the host galaxy.
|
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