Table 2
Nature of each of the observed optical counterpart candidates for 1FHL sources.
| USNO designator | Features | EW [Å] | Flux | Redshift | Class |
| 1FHL association (Distance) | |||||
| (1) | (2) | (3) | (4) | (5) | (6) |
|
|
|||||
| U0750-00173701 | – | – | – | – | BL Lac |
| 1FHL J0044.0-1111 (5.7) | – | – | – | – | |
|
|
|||||
| U0975-00792795 | – | – | – | – | BL Lac |
| 1FHL J0338.4+1304 (2.5) | – | – | – | – | |
|
|
|||||
| U0675-01653184 | – | – | – | – | BL Lac |
| 1FHL J0439.9-1858 (2.9) | – | – | – | – | |
|
|
|||||
| U0750-02519189 | G | 1.0 ± 0.6 | −8 ± −4 | 0.135 ± 0.001 | BL Lac |
| 1FHL J0639.6-1244 (10.7) | Na | 2.3 ± 1 | −21 ± −10 | ||
|
|
|||||
| U0875-0218538 | – | – | – | – | BL Lac |
| 1FHL J0746.3-0225 (1.7) | – | – | – | – | |
|
|
|||||
| U0825-05946383 | – | – | – | – | BL Lac |
| 1FHL J0804.8-0626 (2.1) | – | – | – | – | |
|
|
|||||
| U0825-05946383 | Lyα | 312 ± 28 | 95 ± 10 | 2.929 ± 0.003 | QSO |
| 1FHL J1115.0-0701 (3.2) | NV | 262 ± 49 | 76 ± 12 | ||
| SiV/OIV | 79 ± 14 | 21 ± 3 | |||
| CIV | 264 ± 31 | 82 ± 6 | |||
|
|
|||||
| U0750-08080787 | – | – | – | – | BL Lac |
| 1FHL J1315.7-0730 (3.3) | – | – | – | – | |
|
|
|||||
| U1575-03416792 | MgII | 17 ± 6 | 15 ± 4 | 0.429 ± 0.001 | NLS1 |
| 1FHL J1410.4+7408 A (4.4) | Hγ | 18 ± 9 | 9 ± 4 | ||
| Hβ | 35 ± 14 | 14 ± 5 | |||
| [OIII] | – | – | |||
|
|
|||||
| U1575-03416943 | – | – | – | – | BL Lac |
| 1FHL J1410.4+7408 B (3.3) | – | – | – | – | |
|
|
|||||
| U0600-17715078 | – | – | – | – | BL Lac |
| 1FHL J1512.1-2255 (1.0) | – | – | – | – | |
|
|
|||||
| U0825-08948904 | – | – | – | – | BL Lac |
| 1FHL J1549.9-0658 (1.4) | – | – | – | – | |
|
|
|||||
| U1125-10089754 | – | – | – | – | BL Lac |
| 1FHL J1841.1+2914 (5.6) | – | – | – | – | |
|
|
|||||
| U1530-0317394 | FeII | 11 ± 7 | −1.5 ± −0.9 | ≥0.9 | BL Lac |
| 1FHL J2002.6+6303 (1.1) | MgIIa | 10 ± 3 | −1.6 ± −0.6 | ||
| MgIIb | 7 ± 2 | −1.1 ± −0.4 | |||
Notes. The units for all the reported flux densities are 1 × 10-16 erg cm-2 s-1 Å-1. The equivalent width (EW) is given in the observer’s frame. Emission lines are given as positive flux values, and absorption lines as negative flux values. The distance between the USNO source and the 1FHL centroid is given in arcseconds.
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