Table 1.
Details of the spectroscopic observations used in this work and the main results.
| Source | z | Telescope/instrument | Slit width | σinstr | σmeas | MBH, σ | EW(Hα) | HδA |
|---|---|---|---|---|---|---|---|---|
| (arcsec) | (km s−1) | (km s−1) | log10(M⊙) | (Å) | (Å) | |||
| GSN069 | 0.0182 (a) | Magellan/MagE | 0.7 | 21 | 63 ± 4 | 5.99 ± 0.50 | −12.5(4) | 3.5 ± 0.2 |
| RXJ1301 | 0.0237 (b) | SDSS | 3 | 70 | 90 ± 2 | 6.65 ± 0.42 | −/[−1.7(3)] | 6.26 ± 0.05 |
| eRO-QPE1 | 0.0505 (c) | Magellan/MagE | 0.7 | 21 | 56 ± 5 | 5.78 ± 0.55 | −2.8(4)/[−3.4(5)] | 2.7 ± 0.3 |
| eRO-QPE2 | 0.0175 (c) | Magellan/MagE | 0.7 | 21 | 36 ± 3 | 4.96 ± 0.54 | −13.1(2) | 1.1 ± 0.4 |
| 2MASXJ0249 | 0.0186 (d) | Keck/ESI | 0.5 | 16 | 43 ± 4 | 5.29 ± 0.55 | −33.2(5) | −2.9 ± 0.9 |
Notes. Redshifts are adopted from the literature. For the SDSS spectrum, we report the radius of the fibre, rather than the slit width. The black hole mass is reported using the M − σ relation of Gültekin et al. (2009). The EW(Hα) lists the measured EW of the line in the rest frame, where values in brackets denote uncertainties as to the last digit. For eRO-QPE1 and RXJ1301, values in square brackets denote measurements on the stellar absorption corrected (i.e. template subtracted) spectra; for RXJ1301, there is no emission before the stellar absorption was corrected. We note that HδA represents the Lick HδA absorption index. Negative values indicate lines in emission.
References. (a)Saxton et al. (2011), (b)Dewangan et al. (2000), (c)Arcodia et al. (2021), (d)Esquej et al. (2007).
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