New GTC spectroscopic data and a statistical study to better constrain the redshift of the BL Lac RGB J2243 + 203

Rosa González, D.; Muriel, H.; Mayya, Y. D.; Aretxaga, I.; Becerra González, J.; Carramiñana, A.; Méndez-Abreu, J.; Vega, O.; Terlevich, E.; Coutiño de León, S.; Furniss, A.; Longinotti, A. L.; Terlevich, R. J.; Pichel, A. C.; Rovero, A. C.; Donzelli, C.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 4, p.5422-5429

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2
2019
Number of authors
16
IAC number of authors
2
Citations
5
Refereed citations
4
Description
We present new spectroscopic data of the BL Lac RGB 2243 + 203, and its surroundings, obtained with the OSIRIS Multi Object Spectrograph (MOS) mounted in the Gran Telescopio Canarias (GTC). The spectra of neither the BL Lac nor its host galaxy show any spectral feature, thus hindering direct determination of its redshift. The spectroscopic redshift distribution of objects in the MOS field of view shows four galaxies with redshift between 0.5258 and 0.5288. We make use of a statistical analysis to test the possibility that the targeted BL Lac may be a member of that group. By using the spectroscopic redshifts obtained with our GTC observations, we found that this probability is between 86 and 93 per cent.
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