%0 Generic %1 alexander2022survey %A Alexander, David M. %A Davis, Tamara M. %A Chaussidon, E. %A Fawcett, V. A. %A Gonzalez-Morales, Alma X. %A Lan, Ting-Wen %A Yeche, Christophe %A Ahlen, S. %A Aguilar, J. N. %A Armengaud, E. %A Bailey, S. %A Brooks, D. %A Cai, Z. %A Canning, R. %A Carr, A. %A Chabanier, S. %A Cousinou, Marie-Claude %A Dawson, K. %A de la Macorra, A. %A Dey, A. %A Dey, Biprateep %A Dhungana, G. %A Edge, A. C. %A Eftekharzadeh, S. %A Fanning, K. %A Farr, James %A Font-Ribera, A. %A Garcia-Bellido, J. %A Garrison, Lehman %A Gaztanaga, E. %A Gontcho, Satya Gontcho A %A Gordon, C. %A Gonzalez, Stefany Guadalupe Medellin %A Guy, J. %A Herrera-Alcantar, Hiram K. %A Jiang, L. %A Juneau, S. %A Karacayli, Naim %A Kehoe, R. %A Kisner, T. %A Kovacs, A. %A Landriau, M. %A Levi, Michael E. %A Magneville, C. %A Martini, P. %A Meisner, Aaron M. %A Mezcua, M. %A Miquel, R. %A Camacho, P. Montero %A Moustakas, J. %A Munoz-Gutierrez, Andrea %A Myers, Adam D. %A Nadathur, S. %A Napolitano, L. %A Nie, J. D. %A Palanque-Delabrouille, N. %A Pan, Z. %A Percival, W. J. %A Perez-Rafols, I. %A Poppett, C. %A Prada, F. %A Ramirez-Perez, Cesar %A Ravoux, C. %A Rosario, D. J. %A Schubnell, M. %A Tarle, Gregory %A Walther, M. %A Weiner, B. %A Youles, S. %A Zhou, Zhimin %A Zou, H. %A Zou, Siwei %D 2022 %K library %T The DESI Survey Validation: Results from Visual Inspection of the Quasar Survey Spectra %U http://arxiv.org/abs/2208.08517 %X A key component of the Dark Energy Spectroscopic Instrument (DESI) survey validation (SV) is a detailed visual inspection (VI) of the optical spectroscopic data to quantify key survey metrics. In this paper we present results from VI of the quasar survey using deep coadded SV spectra. We show that the majority (~70%) of the main-survey targets are spectroscopically confirmed as quasars, with ~16% galaxies, ~6% stars, and ~8% low-quality spectra lacking reliable features. A non-negligible fraction of the quasars are misidentified by the standard DESI spectroscopic pipeline but we show that the majority can be recovered using post-pipeline äfterburner" quasar-identification approaches. We combine these äfterburners" with our standard pipeline to create a modified pipeline to improve the overall quasar completeness. At the depth of the main DESI survey both pipelines achieve a good-redshift purity (reliable redshifts measured within 3000 km/s) of ~99%; however, the modified pipeline recovers ~94% of the visually inspected quasars, as compared to just ~86% from the standard pipeline. We demonstrate that both pipelines achieve an overall redshift precision and accuracy of ~100 km/s and ~70 km/s, respectively. We constructed composite spectra to investigate why some quasars are missed by the standard spectroscopic pipeline and find that they are more host-galaxy dominated and/or dust reddened than the standard-pipeline quasars. We also show example spectra to demonstrate the overall diversity of the DESI quasar sample and provide strong-lensing candidates where two targets contribute to a single DESI spectrum.

@misc{alexander2022survey, abstract = {A key component of the Dark Energy Spectroscopic Instrument (DESI) survey validation (SV) is a detailed visual inspection (VI) of the optical spectroscopic data to quantify key survey metrics. In this paper we present results from VI of the quasar survey using deep coadded SV spectra. We show that the majority (~70%) of the main-survey targets are spectroscopically confirmed as quasars, with ~16% galaxies, ~6% stars, and ~8% low-quality spectra lacking reliable features. A non-negligible fraction of the quasars are misidentified by the standard DESI spectroscopic pipeline but we show that the majority can be recovered using post-pipeline "afterburner" quasar-identification approaches. We combine these "afterburners" with our standard pipeline to create a modified pipeline to improve the overall quasar completeness. At the depth of the main DESI survey both pipelines achieve a good-redshift purity (reliable redshifts measured within 3000 km/s) of ~99%; however, the modified pipeline recovers ~94% of the visually inspected quasars, as compared to just ~86% from the standard pipeline. We demonstrate that both pipelines achieve an overall redshift precision and accuracy of ~100 km/s and ~70 km/s, respectively. We constructed composite spectra to investigate why some quasars are missed by the standard spectroscopic pipeline and find that they are more host-galaxy dominated and/or dust reddened than the standard-pipeline quasars. We also show example spectra to demonstrate the overall diversity of the DESI quasar sample and provide strong-lensing candidates where two targets contribute to a single DESI spectrum.}, added-at = {2022-08-19T05:25:23.000+0200}, author = {Alexander, David M. and Davis, Tamara M. and Chaussidon, E. and Fawcett, V. A. and Gonzalez-Morales, Alma X. and Lan, Ting-Wen and Yeche, Christophe and Ahlen, S. and Aguilar, J. N. and Armengaud, E. and Bailey, S. and Brooks, D. and Cai, Z. and Canning, R. and Carr, A. and Chabanier, S. and Cousinou, Marie-Claude and Dawson, K. and de la Macorra, A. and Dey, A. and Dey, Biprateep and Dhungana, G. and Edge, A. C. and Eftekharzadeh, S. and Fanning, K. and Farr, James and Font-Ribera, A. and Garcia-Bellido, J. and Garrison, Lehman and Gaztanaga, E. and Gontcho, Satya Gontcho A and Gordon, C. and Gonzalez, Stefany Guadalupe Medellin and Guy, J. and Herrera-Alcantar, Hiram K. and Jiang, L. and Juneau, S. and Karacayli, Naim and Kehoe, R. and Kisner, T. and Kovacs, A. and Landriau, M. and Levi, Michael E. and Magneville, C. and Martini, P. and Meisner, Aaron M. and Mezcua, M. and Miquel, R. and Camacho, P. Montero and Moustakas, J. and Munoz-Gutierrez, Andrea and Myers, Adam D. and Nadathur, S. and Napolitano, L. and Nie, J. D. and Palanque-Delabrouille, N. and Pan, Z. and Percival, W. J. and Perez-Rafols, I. and Poppett, C. and Prada, F. and Ramirez-Perez, Cesar and Ravoux, C. and Rosario, D. J. and Schubnell, M. and Tarle, Gregory and Walther, M. and Weiner, B. and Youles, S. and Zhou, Zhimin and Zou, H. and Zou, Siwei}, biburl = {https://www.bibsonomy.org/bibtex/20a8b280a66baad31576cc33872b6758e/gpkulkarni}, description = {The DESI Survey Validation: Results from Visual Inspection of the Quasar Survey Spectra}, interhash = {c772d040bb961f1b843339557a0e40f2}, intrahash = {0a8b280a66baad31576cc33872b6758e}, keywords = {library}, note = {cite arxiv:2208.08517Comment: AJ, submitted, 26 pages, 15 figures, 9 tables, one of a suite of 8 papers detailing targeting for DESI}, timestamp = {2022-08-19T05:25:23.000+0200}, title = {The DESI Survey Validation: Results from Visual Inspection of the Quasar Survey Spectra}, url = {http://arxiv.org/abs/2208.08517}, year = 2022 }