%0 Generic %1 shu2019catalogues %A Shu, Yiping %A Koposov, Sergey E. %A Evans, N. Wyn %A Belokurov, Vasily %A McMahon, Richard G. %A Auger, Matthew W. %A Lemon, Cameron A. %D 2019 %K library %T Catalogues of Active Galactic Nuclei From Gaia and unWISE Data %U http://arxiv.org/abs/1909.02010 %X We present two catalogues of active galactic nucleus (AGN) candidates selected from the latest data of two all-sky surveys -- Data Release 2 (DR2) of the Gaia mission and the unWISE catalogue of the Wide-field Infrared Survey Explorer (WISE). We train a random forest classifier to predict the probability of each source in the Gaia-unWISE joint sample being an AGN, $P_RF$, based on Gaia astrometric and photometric measurements and unWISE photometry. The two catalogues, which we designate C75 and R85, are constructed by applying different $P_RF$ threshold cuts to achieve an overall completeness of 75\% ($\approx$90\% at Gaia $Głeq20$ mag) and reliability of 85\% respectively. The C75 (R85) catalogue contains 2,734,464 (2,182,193) AGN candidates across the effective 36,000 deg$^2$ sky, of which $\approx$0.91 (0.52) million are new discoveries. Photometric redshifts of the AGN candidates are derived by a random forest regressor using Gaia and WISE magnitudes and colours. The estimated overall photometric redshift accuracy is 0.11. Cross-matching the AGN candidates with a sample of known bright cluster galaxies, we identify a high-probability strongly-lensed AGN candidate system, SDSS\,J1326$+$4806, with a large image separation of 21\farcs06. All the AGN candidates in our catalogues will have $\sim$5-year long light curves from Gaia by the end of the mission, and thus will be a great resource for AGN variability studies. Our AGN catalogues will also be helpful in AGN target selections for future spectroscopic surveys, especially ones in the southern hemisphere. The C75 catalogue can be downloaded at https://www.ast.cam.ac.uk/~ypshu/AGN_Catalogues.html.

@misc{shu2019catalogues, abstract = {We present two catalogues of active galactic nucleus (AGN) candidates selected from the latest data of two all-sky surveys -- Data Release 2 (DR2) of the \emph{Gaia} mission and the unWISE catalogue of the \emph{Wide-field Infrared Survey Explorer} (\emph{WISE}). We train a random forest classifier to predict the probability of each source in the \emph{Gaia}-unWISE joint sample being an AGN, $P_{\rm RF}$, based on \emph{Gaia} astrometric and photometric measurements and unWISE photometry. The two catalogues, which we designate C75 and R85, are constructed by applying different $P_{\rm RF}$ threshold cuts to achieve an overall completeness of 75\% ($\approx$90\% at \emph{Gaia} $G\leq20$ mag) and reliability of 85\% respectively. The C75 (R85) catalogue contains 2,734,464 (2,182,193) AGN candidates across the effective 36,000 deg$^2$ sky, of which $\approx$0.91 (0.52) million are new discoveries. Photometric redshifts of the AGN candidates are derived by a random forest regressor using \emph{Gaia} and \emph{WISE} magnitudes and colours. The estimated overall photometric redshift accuracy is 0.11. Cross-matching the AGN candidates with a sample of known bright cluster galaxies, we identify a high-probability strongly-lensed AGN candidate system, SDSS\,J1326$+$4806, with a large image separation of 21\farcs06. All the AGN candidates in our catalogues will have $\sim$5-year long light curves from \emph{Gaia} by the end of the mission, and thus will be a great resource for AGN variability studies. Our AGN catalogues will also be helpful in AGN target selections for future spectroscopic surveys, especially ones in the southern hemisphere. The C75 catalogue can be downloaded at https://www.ast.cam.ac.uk/~ypshu/AGN_Catalogues.html.}, added-at = {2019-09-06T05:39:41.000+0200}, author = {Shu, Yiping and Koposov, Sergey E. and Evans, N. Wyn and Belokurov, Vasily and McMahon, Richard G. and Auger, Matthew W. and Lemon, Cameron A.}, biburl = {https://www.bibsonomy.org/bibtex/262f117bf8e3b1fe1c48e2655b4692c2e/gpkulkarni}, description = {Catalogues of Active Galactic Nuclei From Gaia and unWISE Data}, interhash = {b84c61bcdc1c62074900ebdff0b9317a}, intrahash = {62f117bf8e3b1fe1c48e2655b4692c2e}, keywords = {library}, note = {cite arxiv:1909.02010Comment: 18 pages+appendice, 11 figures, 2 tables, accepted by MNRAS. The C75 AGN catalogue can be downloaded at https://www.ast.cam.ac.uk/~ypshu/AGN_Catalogues.html}, timestamp = {2019-09-06T05:39:41.000+0200}, title = {Catalogues of Active Galactic Nuclei From Gaia and unWISE Data}, url = {http://arxiv.org/abs/1909.02010}, year = 2019 }