A Wide-Field Camera and Fully Remote Operations at the Wyoming Infrared Observatory

Findlay, Joseph R.; Kobulnicky, Henry A.; Weger, James S.; Bucher, Gerald A.; Perry, Marvin C.; Myers, Adam D.; Pierce, Michael; Vogel, Conrad

doi:10.1088/1538-3873/128/969/115003

Cited by 13 publications

(11 citation statements)

References 24 publications

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“…For z ∼ 6 quasar candidates, we first obtained deep i-band imaging with Wide-field Camera mounted on the Wyoming Infrared Observatory (Findlay et al 2016). After PS1 DR1 was released, we instead used PS1 i-band as the dropout band.…”

Section: Discussionmentioning

confidence: 99%

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Exploring Reionization-Era Quasars III: Discovery of 16 Quasars at $6.4\lesssim z \lesssim 6.9$ with DESI Legacy Imaging Surveys and UKIRT Hemisphere Survey and Quasar Luminosity Function at $z\sim6.7$

Wang,

Yang,

Fan

et al. 2018

Preprint

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This is the third paper in a series aims at finding reionzation-era quasars with the combination of DESI Legacy imaging Surveys (DELS) and near-infrared imaging surveys, such as the UKIRT Hemisphere Survey (UHS), as well as the Wide-field Infrared Survey Explore (WISE) mid-infrared survey. In this paper, we describe the updated quasar candidate selection procedure, report the discovery of 16 quasars at 6.4 z 6.9 from area of ∼13,020 deg 2 , and present the quasar luminosity function (QLF) at z ∼ 6.7. The measured QLF follows Φ(L 1450 ) ∝ L −2.35 1450 in the magnitude range -27.6< M 1450 <-25.5. We determine the quasar comoving spatial density at z =6.7 and M 1450 < −26.0 to be 0.39 ± 0.11Gpc −3 and find that the exponential density evolution parameter to be k = −0.78 ± 0.18 from z ∼ 6 to z ∼ 6.7, corresponding to a rapid decline by a factor of ∼ 6 per unit redshift towards earlier epoch, a rate significantly faster than that at z ∼ 3 − 5. The cosmic time between z ∼ 6 and z ∼ 6.7 is only 121 Myrs. The

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Section: Discussionmentioning

confidence: 99%

“…c The i-band photometry were obtained with Wide-field Camera mounted on the Wyoming Infrared Observatory (Findlay et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Exploring Reionization-Era Quasars III: Discovery of 16 Quasars at $6.4\lesssim z \lesssim 6.9$ with DESI Legacy Imaging Surveys and UKIRT Hemisphere Survey and Quasar Luminosity Function at $z\sim6.7$

Wang,

Yang,

Fan

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…For z∼6 quasar candidates, we first obtained deep i-band imaging with the Wide-field Camera mounted on the Wyoming Infrared Observatory (Findlay et al 2016). After PS1 DR1 was released, we instead used PS1 i band as the dropout band.…”

Section: Appendixmentioning

confidence: 99%

Exploring Reionization-era Quasars. III. Discovery of 16 Quasars at 6.4 ≲ z ≲ 6.9 with DESI Legacy Imaging Surveys and the UKIRT Hemisphere Survey and Quasar Luminosity Function at z ∼ 6.7

Wang

Yang

Fan

et al. 2019

ApJ

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160

136

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This is the third paper in a series aimed at finding reionization-era quasars with the combination of DESI Legacy imaging Surveys (DELS), the Pan-STARRS1 (PS1) Survey, and near-infrared imaging surveys, such as the UKIRT Hemisphere Survey (UHS), as well as the Wide-field Infrared Survey Explorer (WISE) mid-infrared survey. In this paper, we describe the updated quasar candidate selection procedure, report the discovery of 16 quasars at 6.4 z6.9 from an area of ∼13,020 deg 2 , and present the quasar luminosity function (QLF) at z∼6.7. The measured QLF follows F µ-L L 1450 1450 2.35 () in the magnitude range −27.6<M 1450 <−25.5. We determine the quasar comoving spatial density at á ñ z =6.7 and M 1450 <−26.0 to be 0.39±0.11 Gpc −3 and find the exponential density evolution parameter to be k=−0.78±0.18 from z∼6 to z∼6.7, corresponding to a rapid decline by a factor of ∼6 per unit redshift toward earlier epochs. This indicates that the rapid decline of quasar spatial density at z>5 that was found by previous works continues to z>6, at a rate significantly faster than the average decline rate between z∼3 and 5. We measured quasar comoving emissivity at z∼6.7, which indicates that high-redshift quasars are highly unlikely to make a significant contribution to hydrogen reionization. The broad absorption line quasar fraction at z6.5 is measured to be 22%. In addition, we also report the discovery of six additional quasars at z∼6 in the Appendix.

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“…New deep ugr imaging was obtained for 17 EDGES galaxies on the WIRO 2.3 m telescope with the WIRO Dou-blePrime camera (Findlay et al 2016) over the course of the summer of 2018. The ground-based WIRO data previously obtained for 15 additional EDGES galaxies are described in Dale et al (2016).…”

Section: New Optical Observations and Data Processingmentioning

confidence: 99%

Radial Star Formation Histories in 32 Nearby Galaxies

Dale

Anderson

Bran

et al. 2020

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The spatially resolved star formation histories are studied for 32 normal star-forming galaxies drawn from the the Spitzer Extended Disk Galaxy Exploration Science survey. At surface brightness sensitivities fainter than 28 mag arcsec −2 , the new optical photometry is deep enough to complement archival ultraviolet and infrared imaging and to explore the properties of the emission well beyond the traditional optical extents of these nearby galaxies. Fits to the spectral energy distributions using a delayed star formation history model indicate a subtle but interesting average radial trend for the spiral galaxies: the inner stellar systems decrease in age with increasing radius, consistent with insideout disk formation, but the trend reverses in the outermost regions with the stellar age nearly as old as the innermost stars. These results suggest an old stellar outer disk population formed through radial migration and/or the cumulative history of minor mergers and accretions of satellite dwarf galaxies. The subset of S0 galaxies studied here show the opposite trend compared to what is inferred for spirals: characteristic stellar ages that are increasingly older with radius for the inner portions of the galaxies, and increasingly younger stellar ages for the outer portions. This result suggests that either S0 galaxies are not well modeled by a delayed-τ model, and/or that S0 galaxies have a more complicated formation history than spiral galaxies.

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A Wide-Field Camera and Fully Remote Operations at the Wyoming Infrared Observatory

Cited by 13 publications

References 24 publications

Exploring Reionization-Era Quasars III: Discovery of 16 Quasars at $6.4\lesssim z \lesssim 6.9$ with DESI Legacy Imaging Surveys and UKIRT Hemisphere Survey and Quasar Luminosity Function at $z\sim6.7$

Exploring Reionization-Era Quasars III: Discovery of 16 Quasars at $6.4\lesssim z \lesssim 6.9$ with DESI Legacy Imaging Surveys and UKIRT Hemisphere Survey and Quasar Luminosity Function at $z\sim6.7$

Exploring Reionization-era Quasars. III. Discovery of 16 Quasars at 6.4 ≲ z ≲ 6.9 with DESI Legacy Imaging Surveys and the UKIRT Hemisphere Survey and Quasar Luminosity Function at z ∼ 6.7

Radial Star Formation Histories in 32 Nearby Galaxies

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