The Dark Energy Survey and operations: Year 1

Diehl, H. T.; Abbott, T. M. C.; Annis, J.; Armstrong, R.; Baruah, L.; Bermeo, A.; Bernstein, G. M.; Beynon, Emma; Bruderer, C.; Buckley-Geer, E.; Campbell, H.; Capozzi, D.; Carter, M.; Casas, R.; Clerkin, L.; Covarrubias, R.; Cuhna, C.; D’Andrea, C. B.; Costa, L. Da; Das, Ritanjan; DePoy, D. L.; Dietrich, J. P.; Drlica-Wagner, A.; Elliott, Ann; Eifler, T. F.; Estrada, J.; Etherington, James; Flaugher, B.; Frieman, J.; Neto, A. Fausti; Gel'man, M. M.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Hao, Jiangang; Head, H.; Helsby, Jennifer; Hoffman, K. D.; Honscheid, K.; James, D. J.; Johnson, Michael D.; Kacprzac, T.; Katsaros, J.; Kennedy, Rebecca; Kent, Stephen M.; Kessler, R.; Kim, A.; Krause, E.; Krön, Richard G.; Kuhlmann, S.; Kunder, Andrea; Li, T.; Lin, Huan; MacCrann, N.; March, M.; Marshall, J. L.; Neilsen, Eric H.; Nugent, P.; Martini, Paul; Melchior, P.; Menanteau, F.; Nichol, R. C.; Nord, B.; Ogando, R. L. C.; Old, Lyndsay; Papadopoulos, A.; Patton, K.; Petravick, D.; Plazas, A. A.; Poulton, R.; Pujol, Arnau; Reil, K.; Rigby, T.; Romer, A. K.; Roodman, A.; Rooney, Philip; Álvaro, Eusebio Sánchez; Serrano, S.; Sheldon, E.; Smith, Alex; Smith, Randall; Soares-Santos, M.; Soumagnac, M.; Spinka, H.; Suchyta, E.; Tucker, D. L.; Walker, A. R.; Wester, W. C.; Wiesner, Matthew; Wilcox, H.; Williams, Richard J.; Yanny, B.; Zhang, Y. Y.

doi:10.1117/12.2056982

Cited by 60 publications

(39 citation statements)

References 23 publications

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“…The measurements in this work are based on the DES Y1 data (Diehl et al 2014). Here we briefly describe the relevant catalogs used, including the REDMAPPER galaxy cluster catalog, the photometric galaxy catalog, the weak lensing shear catalogs, and the photometric redshift (photo-z) catalog.…”

Section: Datamentioning

confidence: 99%

The Splashback Feature around DES Galaxy Clusters: Galaxy Density and Weak Lensing Profiles

Chang¹,

Baxter²,

Jain³

et al. 2018

ApJ

Self Cite

102

131

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Splashback refers to the process of matter that is accreting onto a dark matter halo reaching its first orbital apocenter and turning around in its orbit. The clustercentric radius at which this process occurs, r sp , defines a halo boundary that is connected to the dynamics of the cluster. A rapid decline in the halo profile is expected near r sp . We measure the galaxy number density and weak lensing mass profiles around REDMAPPER galaxy clusters in the first-year Dark Energy Survey (DES) data. For a cluster sample with mean M 200m mass ≈2.5×1014 M e , we find strong evidence of a splashback-like steepening of the galaxy density profile and measure r sp =1.13± 0.07 h −1 Mpc, consistent with the earlier Sloan Digital Sky Survey measurements of More et al. and Baxter et al. Moreover, our weak lensing measurement demonstrates for the first time the existence of a splashback-like steepening of the matter profile of galaxy clusters. We measure r sp =1.34±0.21 h −1 Mpc from the weak lensing data, in good agreement with our galaxy density measurements. For different cluster and galaxy samples, we find that, consistent with ΛCDM simulations, r sp scales with R 200m and does not evolve with redshift over the redshift range of 0.3-0.6. We also find that potential systematic effects associated with the REDMAPPER algorithm may impact the location of r sp . We discuss the progress needed to understand the systematic uncertainties and fully exploit forthcoming data from DES and future surveys, emphasizing the importance of more realistic mock catalogs and independent cluster samples.

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Section: Datamentioning

confidence: 99%

The Splashback Feature around DES Galaxy Clusters: Galaxy Density and Weak Lensing Profiles

Chang¹,

Baxter²,

Jain³

et al. 2018

ApJ

Self Cite

102

131

View full text Add to dashboard Cite

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“…We here use the Year One First Annual (Y1A1) internal collaboration release of the Dark Energy Survey (DES) data (Diehl et al (2014), Drlica-Wagner et al (In preparation)). These data cover ∼1840 deg 2 of the southern celestial hemisphere to a median 10σ point source (MAG PSF) depth in AB magnitudes of 23.28, 23.6, 23.1, 22.3 and 20.8.…”

Section: Dark Energy Survey Datamentioning

confidence: 99%

Eight new luminous z ≥ 6 quasars discovered via SED model fitting of VISTA, WISE and Dark Energy Survey Year 1 observations

Reed

McMahon

Martini

et al. 2017

Monthly Notices of the Royal Astronomical Society

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118

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We present the discovery and spectroscopic confirmation with the ESO NTT and Gemini South telescopes of eight new 6.0 < z < 6.5 quasars with z AB < 21.0. These quasars were photometrically selected without any star-galaxy morphological criteria from 1533 deg 2 using SED model fitting to photometric data from the Dark Energy Survey (g, r, i, z, Y), the VISTA Hemisphere Survey (J, H, K) and the Wide-Field Infrared Survey Explorer (W1, W2). The photometric data was fitted with a grid of quasar model SEDs with redshift dependent Lyman-α forest absorption and a range of intrinsic reddening as well as a series of low mass cool star models. Candidates were ranked using on a SED-model based χ 2 -statistic, which is extendable to other future imaging surveys (e.g. LSST, Euclid). Our spectral confirmation success rate is 100% without the need for follow-up photometric observations as used in other studies of this type. Combined with automatic removal of the main types of non-astrophysical contaminants the method allows large data sets to be processed without human intervention and without being over run by spurious false candidates. We also present a robust parametric redshift estimating technique that gives compararable accuracy to MgII and CO based redshift estimators. We find two z ∼ 6.2 quasars with HII near zone sizes 3 proper Mpc which could indicate that these quasars may be young with ages 10 6 − 10 7 years or lie in over dense regions of the IGM. The z = 6.5 quasar VDESJ0224−4711 has J AB = 19.75 is the second most luminous quasar known with z 6.5.

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“…With the most recent releases of the wide-field photometry from the Dark Energy Survey (DES, Diehl et al 2014) and the Gaia mission (Gaia Collaboration et al 2016), the low-surface brightness structure of the Clouds has started to come into a sharp focus Mackey et al 2016;Belokurov et al 2017;Deason et al 2017;Pieres et al 2017;Mackey et al 2018). These studies provided plenty of tantalizing evidence for the past and ongoing encounters between the Clouds as well as their disruption by the MW.…”

Section: Introductionmentioning

confidence: 99%

Stellar streams around the Magellanic Clouds in 4D

Navarrete

Belokurov

Catelan

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We carried out a spectroscopic follow-up program of the four new stellar stream candidates detected by in the outskirts of the Large Magellanic Cloud (LMC) using FORS2 (VLT). The medium-resolution spectra were used to measure the line-of-sight velocities, estimate stellar metallicities and to classify stars into Blue Horizontal Branch (BHB) and Blue Straggler (BS) stars. Using the 4-D phase-space information, we attribute approximately one half of our sample to the Magellanic Clouds, while the rest is part of the Galactic foreground. Only two of the four stream candidates are confirmed kinematically. While it is impossible to estimate the exact levels of MW contamination, the phase-space distribution of the entire sample of our Magellanic stars matches the expected velocity gradient for the LMC halo and extends as far as 33 deg (angular separation) or 29 kpc from the LMC center. Our detections reinforce the idea that the halo of the LMC seems to be larger than previously expected, and its debris can be spread in the sky out to very large separations from the LMC center. Finally, we provide some kinematic evidence that many of the stars analysed here have likely come from the Small Magellanic Cloud.

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The Dark Energy Survey and operations: Year 1

Cited by 60 publications

References 23 publications

The Splashback Feature around DES Galaxy Clusters: Galaxy Density and Weak Lensing Profiles

The Splashback Feature around DES Galaxy Clusters: Galaxy Density and Weak Lensing Profiles

Eight new luminous z ≥ 6 quasars discovered via SED model fitting of VISTA, WISE and Dark Energy Survey Year 1 observations

Stellar streams around the Magellanic Clouds in 4D

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