SCORPIO: Final design and performance estimates for time domain astronomy

Robberto, M.; Roming, P. W. A.; Horst, A. J. van der; García-Vargas, María Luisa; Smee, Stephen A.; Goodsell, Stephen J.; Radwick, Jeffrey; Hayward, T. L.; Andersen, M.; Pope, S.; Chaffee, Ethan E.; Veach, Todd; Brody, Antonina; Smith, K. D.; Killough, Ronnie; Persson, Kristian; Stange, Jason L.; Bayless, Amanda J.; Thibodeaux, R.J.; Peterson, Andrew; Mathias, Alexa K.; Schwendeman, Carl; Thornton, Adam; Grubbs, G. A.; Verastegui, Ernesto R.; Lechner, Thomas; Maldonado-Medina, Manuel; Pérez-Calpena, A.; Sánchez-Blanco, E.; Veredas, G.; Díaz, Rubén; Lazo, Manuel; Kleinman, S. J.; Gelman, Landon; Barkhouser, Robert H.; Hope, Stephen C.

doi:10.1117/12.2568031

Cited by 4 publications

(1 citation statement)

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“…Another avenue of further investigation includes increasing the sample size of quasars with significantly higher spectral resolution, e.g., using Gemini's Spectrograph and Camera for Observations of Rapid Phenomena in the Infrared and Optical (SCORPIO, [122]), in order to further improve the UV-based redshift corrections by obtaining more accurate line peaks of spectral features. Machine learning can also play an important role as larger data sets will be produced that require redshift correction en masse.…”

Section: Discussionmentioning

confidence: 99%

Placing High-Redshift Quasars in Perspective: Unifying Distant Quasars with Their Lower Redshift Counterparts through Near-Infrared Spectroscopy

Matthews

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I present spectroscopic measurements for 260 sources from the Gemini Near Infrared Spectrograph–Distant Quasar Survey (GNIRS-DQS). Being the largest uniform, homogeneous survey of its kind, it represents a flux-limited sample of Sloan Digital Sky Survey (SDSS) quasars at 1.5 < z < 3.5. A combination of the GNIRS and SDSS spectra covers principal quasar diagnostic features, chiefly the C IV λ1549, Mg II λλ2798, 2803, Hβ λ4861, and [O III] λλ4959, 5007 emission lines, in each source. The spectral inventory is utilized primarily to develop prescriptions for obtaining more accurate and precise redshifts, black hole masses, and accretion rates for all quasars. Additionally, the measurements facilitate an understanding of the dependence of rest-frame ultraviolet–optical spectral properties of quasars on redshift, luminosity, and Eddington ratio, and test whether the physical properties of the quasar central engine evolve over cosmic time.

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Section: Discussionmentioning

confidence: 99%

Placing High-Redshift Quasars in Perspective: Unifying Distant Quasars with Their Lower Redshift Counterparts through Near-Infrared Spectroscopy

Matthews

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Photometric redshift estimation for gamma-ray bursts from the early Universe

Fausey,

van der Horst,

White

et al. 2023

Monthly Notices of the Royal Astronomical Society

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Future detection of high-redshift gamma-ray bursts (GRBs) will be an important tool for studying the early Universe. Fast and accurate redshift estimation for detected GRBs is key for encouraging rapid follow-up observations by ground- and space-based telescopes. Low-redshift dusty interlopers pose the biggest challenge for GRB redshift estimation using broad photometric bands, as their high extinction can mimic a high-redshift GRB. To assess false alarms of high-redshift GRB photometric measurements, we simulate and fit a variety of GRBs using phozzy, a simulation code developed to estimate GRB photometric redshifts, and test the ability to distinguish between high- and low-redshift GRBs when using simultaneously observed photometric bands. We run the code with the wavelength bands and instrument parameters for the Photo-z Infrared Telescope (PIRT), an instrument designed for the Gamow mission concept. We explore various distributions of host galaxy extinction as a function of redshift, and their effect on the completeness and purity of a high-redshift GRB search with the PIRT. We find that for assumptions based on current observations, the completeness and purity range from ∼82 to 88 % and from ∼84 to $>99~{{\%}}$, respectively. For the priors optimized to reduce false positives, only $\sim 0.6~{{\%}}$ of low-redshift GRBs will be mistaken as a high-redshift one, corresponding to ∼1 false alarm per 500 detected GRBs.

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Near-Infrared Spectroscopy of High Redshift Quasars: Bringing Distant Quasars into View

Dix

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The Gemini Near Infrared Spectrograph - Distant Quasar Survey (GNIRS-DQS) is the largest uniform, homogeneous survey of its kind, covering 260 quasars at 1.5 ≤ z ≤ 3.5. This unique survey, coupled with data from the Sloan Digital Sky Survey (SDSS), enables new investigations into redshifts, supermassive black hole masses (MBH), and accretion rates at high redshift through spectroscopic coverage of important rest-frame UV-optical emission lines. The importance of this survey is highlighted in the fact that the optical emission lines provide more reliable measurements of these quasar parameters than their UV counterpart. With such a unique sample compiled here, I construct prescriptions to calibrate these quasar parameters derived from rest-frame UV emission lines to those derived from rest-frame optical emission lines. These prescriptions provide important insight into how these parameters depend on redshift and are potentially biased as we look out further into the universe. Additionally, all the work completed with this sample will help shape our understanding of how these quasars and their host galaxies co-evolve over cosmic time.

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SCORPIO: Final design and performance estimates for time domain astronomy

Cited by 4 publications

References 0 publications

Placing High-Redshift Quasars in Perspective: Unifying Distant Quasars with Their Lower Redshift Counterparts through Near-Infrared Spectroscopy

Placing High-Redshift Quasars in Perspective: Unifying Distant Quasars with Their Lower Redshift Counterparts through Near-Infrared Spectroscopy

Photometric redshift estimation for gamma-ray bursts from the early Universe

Near-Infrared Spectroscopy of High Redshift Quasars: Bringing Distant Quasars into View

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