Table 4
Flux variability of NGC 3998.
| Date | Frequency | Flux density | Reference |
| MHz | mJy | ||
|
|
|||
| 30/11/1979a> | 1500 | 107 ± 3 | (1) |
| 30/11/1979a> | 4900 | 98 ± 3 | (1) |
| 09/12/1980 | 1500 | 98 ± 3 | (1) |
| 09/12/1980 | 4900 | 83 ± 3 | (1) |
| 02/05/1987a> | 4850 | 88 ± 8 | (2) |
| 23/11/1993 | 1420 | 109 ± 3 | (3) |
| 24/02/2006 | 4860 | 302 | (4) |
| 27/05/2006 | 4844 | 277 | (5) |
| 25/06/2009 | 1420 | 177 ± 9 | This work. |
| 15/02/2011b> | 1420 | 175 ± 9 | This work. |
| 02/06/2015 | 1381 | 149 ± 7 | This work. |
| 20/06/2015 | 4901 | 118 ± 6 | This work. |
Notes. We present the epoch, frequency, flux density and uncertainty (where available) and the associated reference for the measurement.
In cases where there was an ambiguity in the date (e.g., survey data/several epochs), the median date was used.
References. (1) Wrobel & Heeschen (1984); (2) Gregory et al. (1996); (3) Condon et al. (1998); (4) Kharb et al. (2012); (5) Helmboldt (2007).
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