More classifications of Gaia Alerted QSO candidates
ATel #15272; T. Pursimo (NOT-LaPalma), M. Dennefeld (IAP-Paris and Sorbonne University), R. Ojha (NASA-HQ)
on 12 Mar 2022; 16:40 UT
Credential Certification: Michel Dennefeld (dennefel@iap.fr)
Subjects: Optical, Blazar, Quasar
We present further classifications of Gaia Alerted (Hodgkin et al. 2021, A&A, 652, 76) QSO candidates, as presented first in ATel #15138 (and subsequently in ATel #15155 and #15233).
Spectra were obtained over the years with ALFOSC at the Nordic Optical Telescope, with a resolution of ~300, and a spectral range covering from 350 to 960 nm.
Gaia Name | IAU Name | Type | Redshift | Lines seen |
Gaia19bbm | AT2019ccl | QSO | 0.250 | Halpha, [OIII], Hbeta (FWHM ~10000 km/s) |
Gaia19bbw | AT2019ccv | QSO | 0.287 | Ha (FWHM 9400 km/s), [OIII], Hb, |
Gaia20apq | AT2020bxg | QSO | 0.330 | Ha (FWHM 10900 km/s), [OIII], Hb |
Gaia20dqs | AT2019cgv | Sey1 | 0.1203 | Ha (FWHM 7300 km/s), Hb, [NeV], MgII |
Gaia21dcq | AT2021rtv | QSO | 0.5101 | Hb (FWHM 2800 km/s), [OIII], Hg, MgII |
Gaia21fnn | AT2021yyj | QSO | 0.3336 | Ha (FWHM 14100 km/s), [OIII], Hb |
The two candidates, Gaia19bbm and Gaia19bbw, were initially classified as BL-Lac, but thanks to their variability did show broad Balmer lines at some point, allowing to determine their redshift. Gaia 21fnn had an SDSS spectrum with a redshift of 6.164, but this redshift is in error due to Halpha misinterpreted as Ly-alpha.
