Table 2
Astrometric uncertainties and coordinates.
| Uncertainties: | SDSS | z-J | Cent./Shift | e-Merlin | Total |
| (mas) | (mas) | (mas) | (mas) | (mas) | |
|
|
|||||
| J band | |||||
|
|
|||||
| δ(RA) | 42.5 | 10.8 | 5.0 | 4.1 | 44.3 |
| δ(Dec) | 41 | 11.0 | 5.0 | 4.1 | 42.9 |
|
|
|||||
| H band | |||||
|
|
|||||
| δ(RA) | 42.5 | 10.8 | 7.1 | 4.1 | 44.6 |
| δ(Dec) | 41 | 11.0 | 7.1 | 4.1 | 43.2 |
|
|
|||||
| KS band | |||||
|
|
|||||
| δ(RA) | 42.5 | 10.8 | 7.1 | 4.1 | 44.6 |
| δ(Dec) | 41 | 11.0 | 7.1 | 4.1 | 43.2 |
| RA (Bulge) | Dec (Bulge) | |||
| 11:32:34.8515 ± 0.0051 | +53:04:04.475 ± 0.044 | |||
|
|
||||
| RA (Red blob) | Dec (Red blob) | |||
| 11:32:34.8550 ± 0.0051 | +53:04:04.512 ± 0.044 | |||
|
|
||||
| RA (Radio) | Dec (Radio) | |||
| 11:32:34.8497 ± 0.0005* | +53:04:04.527 ± 0.004 | |||
Notes. Upper table: total astrometric uncertainties involved in our results interpretation for each band. Columns: 1) total intrinsic SDSS astrometric uncertainties; 2) z-J bands matching uncertainties during the Subaru astrometric calibration; 3) centering and/or shifting uncertainties during J, H, KS centering and the J−H, J−KS alignments; 4) intrinsic radio map astrometric uncertainties; 5) quadratic addition of all the above. Lower table: from top to bottom, positions of the peak flux of a) the stellar bulge of NGC 3718; b) the offset red blob; and c) the offset e-Merlin 6 cm radio emission.
This is the position of the peak of the radio emission of NGC 3718, using the position of J1146+5356 quoted in Sect. 2.2. Assuming the position used in earlier e-MERLIN observations, our RA and Dec measurements, namely 11:32:34.8534 ± 0.0005 and +53:04:04.523 ± 0.004, are, within the uncertainties, in very good agreement with the position published by Krips et al. (2007).
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