The aim of this study is to explore methods for how to identify new quasars with different properties with regard to reddening, redshift, the presence of broad absorption lines from outflows, or other rare properties affecting the broad-band colours. We use Gaia-based astrometric pre-selection to study only sources tha...
C. Cheng, K. Valeckas, L. Christensen et al.· 0 citations
We report a long-lived nuclear transient in GNz7q, a red quasar at $z=7.19$ powered by a $\sim3\times10^{7}\,M_\odot$ black hole and hosted by a compact, dusty starburst galaxy. The transient was identified in more than two decades of imaging with HST, Spitzer, and JWST. After a rapid rise, the source faded smoothly by...
S. Fujimoto, Q. Fei, G. Brammer et al.· 0 citations
The Nordic Optical Telescope Transient Explorer (NTE) is a new multiarm imaging and spectroscopic instrument being developed for the Nordic Optical Telescope (NOT). In spectroscopic mode, NTE provides simultaneous wavelength coverage from 320nm to 2440nm through three independent arms. To support the time-critical scie...
K. Valeckas, Arthur M. Kadela, J. Viuho et al.· Astronomical Telescopes + In...· 1 citation
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