Table 1.
Observed sources and parameters of the observations for the ‘main sample’ of 24 sources discussed in detail in Sect. 6.
| 3FHL name | 4FGL name | Source name | RA | Dec | Telescope/ | Slit | Start time | Exp. | Airm. | Seeing |
|---|---|---|---|---|---|---|---|---|---|---|
| instrument | (″) | UTC | (s) | (″) | ||||||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) |
| 3FHL J0051.2−6242 | 4FGL J0051.2−6242 | 1RXS J005117.7−624154( † ) | 00 51 16.7 | −62 42 04 | VLT/FORS | 1.3 | 2021-10-04 05:53:10 | 1740 | 1.31 | 0.8 |
| 3FHL J0134.4+2638 | 4FGL J0134.5+2637 | 1RXS J013427.2+263846( † ) | 01 34 28.2 | +26 38 43 | Keck/ESI | 1.0 | 2020-12-06 06:45:21 | 6000 | 1.02 | 1.0 |
| 3FHL J0143.8−5846 | 4FGL J0143.7−5846 | SUMSS J014347−58455( † ) | 01 43 47.4 | −58 45 51 | SALT/RSS | 2.0 | 2021-01-09 19:50:38 | 2330 | 1.34 | 1.7 |
| 2021-01-11 19:31:14 | 2330 | 1.30 | 1.8 | |||||||
| 3FHL J0350.0+0640 | 4FGL J0350.0+0640 | 1RXS J035000.4+064053 | 03 49 57.8 | +06 41 26 | Keck/ESI | 1.0 | 2020-12-06 08:36:07 | 7200 | 1.04 | 1.1 |
| 3FHL J0506.9−5434 | 4FGL J0506.9−5435 | 1ES 0505−546( † ) | 05 06 57.8 | −54 35 03 | SALT/RSS | 2.0 | 2021-02-06 20:48:22 | 2340 | 1.23 | 1.1 |
| 3FHL J0536.4−3342 | 4FGL J0536.4−3343 | WISE J053629.06−334302.5( † ) | 05 36 29.1 | −33 43 03 | VLT/FORS | 1.3 | 2020-10-04 08:07:04 | 1740 | 1.04 | 0.8 |
| 3FHL J0601.0+3837 | 4FGL J0601.0+3838 | B2 0557+38( † ) | 06 01 02.9 | +38 38 28 | Keck/ESI | 1.0 | 2020-12-06 11:02:22 | 7100 | 1.07 | 1.1 |
| 3FHL J0746.3−0225 | 4FGL J0746.3−0225 | WISE J074627.03−022549.3 | 07 46 27.0 | −02 25 49 | Keck/ESI | 1.0 | 2020-12-06 13:33:45 | 6600 | 1.14 | 0.8 |
| 3FHL J0826.3−6403 | 4FGL J0826.4−6404 | SUMSS J082627−640414 | 08 26 27.1 | −64 04 21 | VLT/FORS | 1.3 | 2021-12-01 06:58:20 | 2610 | 1.34 | 0.6 |
| 3FHL J0858.0−3131 | 4FGL J0858.0−3130 | 1RXS J085802.6−313043 | 08 58 02.9 | −31 30 38 | VLT/FORS | 1.3 | 2022-01-02 04:49:38 | 2610 | 1.09 | 0.8 |
| 2022-02-12 04:13:32 | 2610 | 1.01 | 1.1 | |||||||
| 2022-03-04 02:08:00 | 2610 | 1.01 | 0.6 | |||||||
| 3FHL J1130.5−7801 | 4FGL J1130.5−7801 | SUMSS J113032−780105 | 11 30 31.9 | −78 01 05 | VLT/FORS | 1.3 | 2021-01-31 07:43:24 | 2600 | 1.72 | 1.2 |
| 2022-03-26 02:14:48 | 2190 | 1.71 | 0.7 | |||||||
| 3FHL J1427.0+2348 | 4FGL J1427.0+2348 | PKS 1424+240( † ) | 14 27 00.4 | +23 48 00 | GTC/OSIRIS | 1.0 | 2021-04-22 05:22:11 | 1800 | 1.67 | 0.9 |
| 3FHL J1445.0−0326 | 4FGL J1445.0−0326 | RBS 1424( † ) | 14 45 06.2 | −03 26 13 | SALT/RSS | 2.0 | 2021-04-07 01:35:38. | 2390 | 1.26 | 0.9 |
| 3FHL J1503.7−1540 | 4FGL J1503.7−1540 | RBS 1457( † ) | 15 03 40.7 | −15 41 14 | VLT/FORS | 1.3 | 2021-04-15 06:07:40 | 1950 | 1.02 | 0.8 |
| 3FHL J1539.7−1127 | 4FGL J1539.7−1127 | PMN J1539−1128 | 15 39 41.2 | −11 28 35 | SALT/RSS | 2.0 | 2021-04-23 02:21:26 | 2190 | 1.33 | 1.0 |
| 2021-04-24 01:56:38 | 2190 | 1.26 | 1.2 | |||||||
| 3FHL J1656.9−2010 | 4FGL J1656.9−2010 | 1RXS J165655.0−201049 | 16 56 55.1 | −20 10 56 | VLT/FORS | 1.3 | 2021-04-18 05:49:59 | 2600 | 1.10 | 1.0 |
| 3FHL J1745.4−0752 | 4FGL J1745.4−0753 | TXS 1742−078( † ) | 17 45 27.1 | −07 53 04 | VLT/FORS | 1.3 | 2021-04-15 07:20:17 | 2600 | 1.10 | 1. 1 |
| 2021-04-22 08:47:38 | 2600 | 1.07 | 0.8 | |||||||
| 3FHL J1842.4−5841 | 4FGL J1842.4−5840 | 1RXS J184230.6−584202 | 18 42 29.8 | −58 41 56 | VLT/FORS | 1.3 | 2020-09-20 01:03:25 | 1700 | 1.29 | 0.8 |
| 2021-04-15 08:23:25 | 2400 | 1.24 | 1.4 | |||||||
| 3FHL J2036.9−3328 | 4FGL J2036.9−3329 | 1RXS J203650.9−332817 | 20 36 49.5 | −33 28 31 | VLT/FORS | 1.3 | 2021-04-23 08:08:38 | 3600 | 1.20 | 1.1 |
| 2021-05-09 07:36:22 | 3600 | 1.12 | 0.8 | |||||||
| 3FHL J2131.0−2746 | 4FGL J2131.0−2746 | RBS 1751( † ) | 21 31 03.2 | −27 46 58 | VLT/FORS | 1.3 | 2020-09-21 05:41:55 | 350 | 1.04 | 0.8 |
| 3FHL J2156.0+1818 | 4FGL J2156.0+1818 | RX J2156.0+1818 | 21 56 01.6 | +18 18 37 | Keck/ESI | 1.0 | 2020-12-06 04:49:01 | 6000 | 1.17 | 1.0 |
| 3FHL J2221.5−5226 | 4FGL J2221.5−5225 | PMN J2221−5224( † ) | 22 21 29.3 | −52 25 28 | VLT/FORS | 1.3 | 2020-09-21 05:50:31 | 900 | 1.40 | 0.7 |
| 3FHL J2240.3−5240 | 4FGL J2240.3−5241 | SUMSS J224017−524111 | 22 40 17.6 | −52 41 13 | VLT/FORS | 1.3 | 2020-09-21 05:41:55 | 2600 | 1.43 | 0.7 |
| 3FHL J2243.7−1232 | 4FGL J2243.7−1231 | RBS 1888 | 22 43 41.6 | −12 31 38 | VLT/FORS | 1.3 | 2020-09-22 02:12:36 | 3900 | 1.43 | 0.8 |
Notes. VLT/FORS2 spectra were all taken with grism GRIS 600RI+19, except for RBS 1751, which was observed with grism GRIS 1200B+97. The sources with a ( † ) symbol are listed in the BZCAT catalogue (Massaro et al. 2015a). The columns contain: (1) 3FHL name, (2) 4FGL name, (3) Source name, ( † ) indicates the source is in BZCAT, (4) Right nscension (J2000), (5) Declination (J2000), (6) Telescope and instrument, (7) Slit width in arcsec, (8) Start time of the observations, (9) Exposure time, (10) Average airmass, and (11) Average seeing.
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