Red shift
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Age-dating luminous red galaxies observed with the Southern African Large Telescope Open
We measure a value for the cosmic expansion of H(z) = 89 ± 23(stat) ± 44(syst) km s−1 Mpc−1 at a redshift of z ≃ 0.47 based on the differential age technique. This technique, also known as cosmic chronometers, uses the age difference betwe…
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Large Bulk Photovoltaic Effect and Spontaneous Polarization of Single-Layer Monochalcogenides Open
We use a first-principles density functional theory approach to calculate the shift current and linear absorption of uniformly illuminated single-layer Ge and Sn monochalcogenides. We predict strong absorption in the visible spectrum and a…
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The VIMOS Public Extragalactic Redshift Survey (VIPERS) Open
We present the full public data release (PDR-2) of the VIMOS Public Extragalactic Redshift Survey (VIPERS), performed at the ESO VLT. We release redshifts, spectra, CFHTLS magnitudes and ancillary information (as masks and weights) for a c…
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The clustering of DESI-like luminous red galaxies using photometric redshifts Open
We present measurements of the redshift-dependent clustering of a DESI-like luminous red galaxy (LRG) sample selected from the Legacy Survey imaging data set, and use the halo occupation distribution (HOD) framework to fit the clustering s…
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The Raman redshift of graphene impacted by gold nanoparticles Open
The influence of gold nanoparticles (GNPs) on graphene was studied by Raman spectroscopy. It was found that the contact of GNPs could induce the whole Raman spectrum of graphene to redshift. And the shift of the 2D peak is more obvious tha…
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Investigation into the Photoluminescence Red Shift in Cesium Lead Bromide Nanocrystal Superlattices Open
The formation of cesium lead bromide (CsPbBr3) nanocrystal superlattices (NC SLs) is accompanied by a red shift in the NC photoluminescence (PL). The values of the PL red shift reported in the literature range from none to ∼100 meV without…
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Galaxy groups in the low-redshift Universe Open
We apply a halo-based group finder to four large redshift surveys, the 2MRS,\n6dFGS, SDSS and 2dFGRS, to construct group catalogs in the low-redshift\nUniverse. The group finder is based on that of Yang et al. but with an improved\nhalo ma…
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Measuring the distance-redshift relation with the cross-correlation of gravitational wave standard sirens and galaxies Open
Gravitational waves from inspiraling compact binaries are known to be an\nexcellent absolute distance indicator, yet it is unclear whether\nelectromagnetic counterparts of these events are securely identified for\nmeasuring their redshifts…
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The Complete Redshift Distribution of Dusty Star-forming Galaxies from the SPT-SZ Survey Open
The South Pole Telescope (SPT) has systematically identified 81 high-redshift, strongly gravitationally lensed, dusty star-forming galaxies (DSFGs) in a 2500 square degree cosmological millimeter-wave survey. We present the final spectrosc…
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Enhanced ductility and optoelectronic properties of environment-friendly CsGeCl3 under pressure Open
Eco-friendly inorganic halide perovskite materials with numerous structural configurations and compositions are now in the leading place of researcher’s attention for outstanding photovoltaic and optoelectronic performance. In the present …
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Extremely red quasars from SDSS, BOSS and<i>WISE</i>: classification of optical spectra Open
Quasars with extremely red infrared-to-optical colours are an interesting\npopulation that can test ideas about quasar evolution as well as orientation,\nobscuration and geometric effects in the so-called AGN unified model. To\nidentify su…
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RCSLenS: The Red Cluster Sequence Lensing Survey Open
We present the Red Cluster Sequence Lensing Survey (RCSLenS), an application of the methods developed for the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) to the similar to 785 deg(2), multi-band imaging data of the Red-sequenc…
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Phenotypic redshifts with self-organizing maps: A novel method to characterize redshift distributions of source galaxies for weak lensing Open
Wide-field imaging surveys such as the Dark Energy Survey (DES) rely on coarse measurements of spectral energy distributions in a few filters to estimate the redshift distribution of source galaxies. In this regime, sample variance, shot n…
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Emerging spatial curvature can resolve the tension between high-redshift CMB and low-redshift distance ladder measurements of the Hubble constant Open
The measurements of the Hubble constant reveal a tension between high-redshift (CMB) and low-redshift (distance ladder) constraints. So far neither observational systematics nor new physics has been successfully implemented to explain away…
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Two new confirmed massive relic galaxies: red nuggets in the present-day Universe Open
We confirm two new local massive relic galaxies, i.e. untouched survivors of the early Universe massive population: Mrk 1216 and PGC 032873. Both show early and peaked formation events within very short time-scales (< 1 Gyr) and thus old m…
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Photometric redshifts for the Kilo-Degree Survey Open
We present a machine-learning photometric redshift (ML photo- z ) analysis of the Kilo-Degree Survey Data Release 3 (KiDS DR3), using two neural-network based techniques: ANNz2 and MLPQNA. Despite limited coverage of spectroscopic training…
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Quantum Confinement Effect and Photoenhancement of Photoluminescence of PbS and PbS/MnS Quantum Dots Open
The quantum confinement effect and photoenhancement of photoluminescence (PL) of lead sulphide (PbS) quantum dots (QDs) and lead sulphide/manganese sulphide (PbS/MnS) core shell QDs capped with thiol ligands in aqueous solution were invest…
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Winds as the origin of radio emission in z = 2.5 radio-quiet extremely red quasars Open
Most active galactic nuclei (AGNs) are radio-quiet, and the origin of their radio emission is not well-understood. One hypothesis is that this radio emission is a by-product of quasar-driven winds. In this paper, we present the radio prope…
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Can redshift errors bias measurements of the Hubble Constant? Open
Redshifts have been so easy to measure for so long that we tend to neglect the fact that they too have uncertainties and are susceptible to systematic error. As we strive to measure cosmological parameters to better than 1 per cent it is w…
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On the realistic validation of photometric redshifts Open
Two of the main problems encountered in the development and accurate\nvalidation of photometric redshift (photo-z) techniques are the lack of\nspectroscopic coverage in feature space (e.g. colours and magnitudes) and the\nmismatch between …
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BRIGHT GALAXIES AT HUBBLE’S REDSHIFT DETECTION FRONTIER: PRELIMINARY RESULTS AND DESIGN FROM THE REDSHIFT z ∼ 9–10 BoRG PURE-PARALLEL HST SURVEY Open
We present the first results and design from the redshift z ∼ 9–10 Brightest of the Reionizing Galaxies Hubble Space Telescope survey BoRG[ z 9–10], aimed at searching for intrinsically luminous unlensed galaxies during the first 700 Myr a…
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The Rise of Faint, Red Active Galactic Nuclei at <i>z</i> > 4: A Sample of Little Red Dots in the JWST Extragalactic Legacy Fields Open
We present a sample of 341 “little red dots” (LRDs) spanning the redshift range z ∼ 2–11 using data from the CEERS, PRIMER, JADES, UNCOVER, and NGDEEP surveys. Unlike past use of color indices to identify LRDs, we employ continuum slope fi…
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On the energy and redshift distributions of fast radio bursts Open
Fast radio bursts (FRBs) are millisecond-duration radio transients from cosmological distances. Their isotropic energies follow a power-law distribution with a possible exponential cut-off, but their intrinsic redshift distribution, which …
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Quasar and galaxy classification in Gaia Data Release 2 Open
We construct a supervised classifier based on Gaussian Mixture Models to probabilistically classify objects in Gaia data release 2 (GDR2) using only photometric and astrometric data in that release. The model is trained empirically to clas…
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The most luminous blue quasars at 3.0 < <i>z</i> < 3.3 Open
We present the X-ray analysis of 30 luminous quasars at z ≃ 3.0 − 3.3 with pointed XMM–Newton observations (28–48 ks) originally obtained by our group to test the suitability of active galactic nuclei as standard candles for cosmological s…
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Pressure‐Induced Remarkable Spectral Red‐Shift in Mn<sup>2+</sup>‐Activated NaY<sub>9</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub> Red‐Emitting Phosphors for High‐Sensitive Optical Manometry Open
To settle the low sensitivity of luminescent manometers, the Mn 2+ ‐activated NaY 9 (SiO 4 ) 6 O 2 red‐emitting phosphors with splendid pressure sensing performances are developed. Excited by 408 nm, the resulting products emit bright red …
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CLEAR. II. Evidence for Early Formation of the Most Compact Quiescent Galaxies at High Redshift Open
The origin of the correlations between mass, morphology, quenched fraction, and formation history in galaxies is difficult to define, primarily due to the uncertainties in galaxy star formation histories (SFHs). SFHs are better constrained…
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Ultra diffuse galaxies in the MATLAS low-to-moderate density fields Open
Recent advances in deep dedicated imaging surveys over the past decade have uncovered a surprisingly large number of extremely faint low surface brightness galaxies with large physical sizes called ultra diffuse galaxies (UDGs) in clusters…
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The Carnegie-Chicago Hubble Program. VII. The Distance to M101 via the Optical Tip of the Red Giant Branch Method<sup>*</sup> Open
The Carnegie-Chicago Hubble Program (CCHP) is building a direct path to the Hubble constant ( H 0 ) using Population II stars as the calibrator of the Type Ia supernova (SN Ia)-based distance scale. This path to calibrate the SNe Ia is ind…
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Luminescence properties and its red shift of blue-emitting phosphor Na<sub>3</sub>YSi<sub>3</sub>O<sub>9</sub>:Ce<sup>3+</sup>for UV LED Open
A series of Na3YSi3O9:Ce3+phosphors have been synthesizedviaa conventional high temperature solid-state reaction. The emission red shift has been observed and explained by combining the centroid shift and crystal field splitting.