Search

Start Over Capability Type Simple Cone Search
14521. s-process in low-metallicity stars. II.
ID:
ivo://CDS.VizieR/J/MNRAS/418/284
Title:
s-process in low-metallicity stars. II.
Short Name:
J/MNRAS/418/284
Date:
21 Oct 2021
Publisher:
CDS
Description:
High-resolution spectroscopic observations of 100 metal-poor carbon and s-rich stars (CEMP-s) collected from the literature are compared with the theoretical nucleosynthesis models of the asymptotic giant branch (AGB) presented in Paper I, Cat. J/MNRAS/404/1529.
14522. SPT0346-52 CO and H2O ALMA images
ID:
ivo://CDS.VizieR/J/A+A/628/A23
Title:
SPT0346-52 CO and H2O ALMA images
Short Name:
J/A+A/628/A23
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present and study spatially resolved imaging obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) of multiple ^12^CO(J=6-5, 8-7 and 9-8) and two H_2_O(2_02_-1_11_ and 2_11_-2_02_) emission lines and cold dust continuum toward the gravitationally lensed dusty star forming galaxy SPT0346-52 at z=5.656. Using a visibility-domain source-plane reconstruction we probe the structure and dynamics of the different components of the interstellar medium (ISM) in this galaxy down to scales of 1kpc in the source plane. Measurements of the intrinsic sizes of the different CO emission lines indicate that the higher J transitions trace more compact regions in the galaxy. Similarly, we find smaller dust continuum intrinsic sizes with decreasing wavelength, based on observations at rest-frame 130, 300 and 450um. The source shows significant velocity structure, and clear asymmetry where an elongated structure is observed in the source plane with significant variations in their reconstructed sizes. This could be attributed to a compact merger or turbulent disk rotation. The differences in velocity structure through the different line tracers, however, hint at the former scenario in agreement with previous [CII] line imaging results. Measurements of the CO line ratios and magnifications yield significant variations as a function of velocity, suggesting that modeling of the ISM using integrated values could be misinterpreted. Modeling of the ISM in SPT0346-52 based on delensed fluxes indicate a highly dense and warm medium, qualitatively similar to that observed in high redshift quasar hosts.
14523. SPT-GMOS spectroscopy of gal. in massive clusters
ID:
ivo://CDS.VizieR/J/ApJ/837/88
Title:
SPT-GMOS spectroscopy of gal. in massive clusters
Short Name:
J/ApJ/837/88
Date:
21 Oct 2021
Publisher:
CDS
Description:
The velocity distribution of galaxies in clusters is not universal; rather, galaxies are segregated according to their spectral type and relative luminosity. We examine the velocity distributions of different populations of galaxies within 89 Sunyaev Zel'dovich (SZ) selected galaxy clusters spanning 0.28<z<1.08. Our sample is primarily draw from the SPT-GMOS spectroscopic survey, supplemented by additional published spectroscopy, resulting in a final spectroscopic sample of 4148 galaxy spectra -- 2868 cluster members. The velocity dispersion of star-forming cluster galaxies is 17+/-4% greater than that of passive cluster galaxies, and the velocity dispersion of bright (m<m^*^-0.5) cluster galaxies is 11+/-4% lower than the velocity dispersion of our total member population. We find good agreement with simulations regarding the shape of the relationship between the measured velocity dispersion and the fraction of passive versus star-forming galaxies used to measure it, but we find a small offset between this relationship as measured in data and simulations, which suggests that our dispersions are systematically low by as much as 3% relative to simulations. We argue that this offset could be interpreted as a measurement of the effective velocity bias that describes the ratio of our observed velocity dispersions and the intrinsic velocity dispersion of dark matter particles in a published simulation result. Measuring velocity bias in this way suggests that large spectroscopic surveys can improve dispersion-based mass-observable scaling relations for cosmology even in the face of velocity biases, by quantifying and ultimately calibrating them out.
14524. SpT & NIR color excess of Solar-type stars
ID:
ivo://CDS.VizieR/J/AJ/160/130
Title:
SpT & NIR color excess of Solar-type stars
Short Name:
J/AJ/160/130
Date:
21 Oct 2021
Publisher:
CDS
Description:
Although solar-analog stars have been studied extensively over the past few decades, most of these studies have focused on visible wavelengths, especially those identifying solar-analog stars to be used as calibration tools for observations. As a result, there is a dearth of well-characterized solar analogs for observations in the near-infrared, a wavelength range important for studying solar system objects. We present 184 stars selected based on solar-like spectral type and V-J and V-K colors whose spectra we have observed in the 0.8-4.2{mu}m range for calibrating our asteroid observations. Each star has been classified into one of three ranks based on spectral resemblance to vetted solar analogs. Of our set of 184 stars, we report 145 as reliable solar-analog stars, 21 as solar analogs usable after spectral corrections with low-order polynomial fitting, and 18 as unsuitable for use as calibration standards owing to spectral shape, variability, or features at low to medium resolution. We conclude that all but five of our candidates are reliable solar analogs in the longer wavelength range from 2.5 to 4.2{mu}m. The average colors of the stars classified as reliable or usable solar analogs are V-J=1.148, V-H=1.418, and V-K= 1.491, with the entire set being distributed fairly uniformly in R.A. across the sky between -27{deg} and +67{deg} in decl.
14525. SPT-selected galaxy clusters X-ray analysis
ID:
ivo://CDS.VizieR/J/MNRAS/474/1065
Title:
SPT-selected galaxy clusters X-ray analysis
Short Name:
J/MNRAS/474/1065
Date:
21 Oct 2021
Publisher:
CDS
Description:
We analyse Chandra X-ray Observatory observations of a set of galaxy clusters selected by the South Pole Telescope using a new publicly available forward-modelling projection code, MBPROJ2, assuming hydrostatic equilibrium. By fitting a power law plus constant entropy model we find no evidence for a central entropy floor in the lowest entropy systems. A model of the underlying central entropy distribution shows a narrow peak close to zero entropy which accounts for 60 per cent of the systems, and a second broader peak around 130keV.cm^2^. We look for evolution over the 0.2-1.2 redshift range of the sample in density, pressure, entropy and cooling time at 0.015R_500_ and at 10kpc radius. By modelling the evolution of the central quantities with a simple model, we find no evidence for a non-zero slope with redshift. In addition, a non-parametric sliding median shows no significant change. The fraction of cool-core clusters with central cooling times below 2Gyr is consistent above and below z=0.6 (~30-40 per cent). Both by comparing the median thermodynamic profiles, centrally biased towards cool cores, in two redshift bins, and by modelling the evolution of the unbiased average profile as a function of redshift, we find no significant evolution beyond self-similar scaling in any of our examined quantities. Our average modelled radial density, entropy and cooling-time profiles appear as power laws with breaks around 0.2R_500_. The dispersion in these quantities rises inwards of this radius to around 0.4dex, although some of this scatter can be fitted by a bimodal model.
14526. SPT-SZ clusters with optical & X-ray data
ID:
ivo://CDS.VizieR/J/ApJ/878/55
Title:
SPT-SZ clusters with optical & X-ray data
Short Name:
J/ApJ/878/55
Date:
21 Oct 2021
Publisher:
CDS
Description:
We derive cosmological constraints using a galaxy cluster sample selected from the 2500deg^2^ SPT-SZ survey. The sample spans the redshift range 0.25<z<1.75 and contains 343 clusters with SZ detection significance {xi}>5. The sample is supplemented with optical weak gravitational lensing measurements of 32 clusters with 0.29<z<1.13 (from Magellan and Hubble Space Telescope) and X-ray measurements of 89 clusters with 0.25<z<1.75 (from Chandra). We rely on minimal modeling assumptions: (i) weak lensing provides an accurate means of measuring halo masses, (ii) the mean SZ and X-ray observables are related to the true halo mass through power-law relations in mass and dimensionless Hubble parameter E(z) with a priori unknown parameters, and (iii) there is (correlated, lognormal) intrinsic scatter and measurement noise relating these observables to their mean relations. We simultaneously fit for these astrophysical modeling parameters and for cosmology. Assuming a flat {nu}{Lambda}CDM model, in which the sum of neutrino masses is a free parameter, we measure {Omega}_m_=0.276+/-0.047, {sigma}_8_=0.781+/-0.037, and {sigma}_8_({Omega}_m_/0.3)^0.2^=0.766+/-0.025. The redshift evolutions of the X-ray Y_X_-mass and M_gas_-mass relations are both consistent with self-similar evolution to within 1{sigma}. The mass slope of the Y_X_-mass relation shows a 2.3{sigma} deviation from self-similarity. Similarly, the mass slope of the M_gas_-mass relation is steeper than self-similarity at the 2.5{sigma} level. In a {nu}wCDM cosmology, we measure the dark energy equation-of-state parameter w=-1.55+/-0.41 from the cluster data. We perform a measurement of the growth of structure since redshift z~1.7 and find no evidence for tension with the prediction from general relativity. This is the first analysis of the SPT cluster sample that uses direct weak-lensing mass calibration and is a step toward using the much larger weak-lensing data set from DES. We provide updated redshift and mass estimates for the SPT sample.
14527. SPT-SZ survey galaxy clusters optical spectroscopy
ID:
ivo://CDS.VizieR/J/ApJ/792/45
Title:
SPT-SZ survey galaxy clusters optical spectroscopy
Short Name:
J/ApJ/792/45
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present optical spectroscopy of galaxies in clusters detected through the Sunyaev-Zel'dovich (SZ) effect with the South Pole Telescope (SPT). We report our own measurements of 61 spectroscopic cluster redshifts, and 48 velocity dispersions each calculated with more than 15 member galaxies. This catalog also includes 19 dispersions of SPT-observed clusters previously reported in the literature. The majority of the clusters in this paper are SPT-discovered; of these, most have been previously reported in other SPT cluster catalogs, and five are reported here as SPT discoveries for the first time. By performing a resampling analysis of galaxy velocities, we find that unbiased velocity dispersions can be obtained from a relatively small number of member galaxies (<~ 30), but with increased systematic scatter. We use this analysis to determine statistical confidence intervals that include the effect of membership selection. We fit scaling relations between the observed cluster velocity dispersions and mass estimates from SZ and X-ray observables. In both cases, the results are consistent with the scaling relation between velocity dispersion and mass expected from dark-matter simulations. We measure a ~30% log-normal scatter in dispersion at fixed mass, and a ~10% offset in the normalization of the dispersion-mass relation when compared to the expectation from simulations, which is within the expected level of systematic uncertainty.
14528. SPT-SZ survey point sources at 95, 150 & 220GHz
ID:
ivo://CDS.VizieR/J/ApJ/779/61
Title:
SPT-SZ survey point sources at 95, 150 & 220GHz
Short Name:
J/ApJ/779/61
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a point-source catalog from 771deg^2^ of the South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey at 95, 150, and 220GHz. We detect 1545 sources above 4.5{sigma} significance in at least one band. Based on their relative brightness between survey bands, we classify the sources into two populations, one dominated by synchrotron emission from active galactic nuclei, and one dominated by thermal emission from dust-enshrouded star-forming galaxies. We find 1238 synchrotron and 307 dusty sources. We cross-match all sources against external catalogs and find 189 unidentified synchrotron sources and 189 unidentified dusty sources. The dusty sources without counterparts are good candidates for high-redshift, strongly lensed submillimeter galaxies. We derive number counts for each population from 1Jy down to roughly 11, 4, and 11mJy at 95, 150, and 220GHz. We compare these counts with galaxy population models and find that none of the models we consider for either population provide a good fit to the measured counts in all three bands. The disparities imply that these measurements will be an important input to the next generation of millimeter-wave extragalactic source population models.
14529. SpUDS IRAC Catalog
ID:
ivo://irsa.ipac/Spitzer/Catalog/SpUDS/SpUDS-IRACCat
Title:
SpUDS IRAC Catalog
Short Name:
SpUDS IRACCat
Date:
01 Oct 2018 20:27:19
Publisher:
NASA/IPAC Infrared Science Archive
Description:
Spitzer Public Legacy Survey of the UKIDSS Ultra Deep Survey (SpUDS) is a survey of the ~1 square degree UKIDSS Ultra Deep Survey (UDS). The survey consists of deep IRAC and 24 micron MIPS observations. The UDS is the largest deep near-infrared (JHK) survey in existence, and the first capable of sampling representative cosmological volumes (100x100 Mpc) out to the highest redshifts (z>6).
14530. SpUDS MIPS Catalog
ID:
ivo://irsa.ipac/Spitzer/Catalog/SpUDS/SpUDS-MIPSCat
Title:
SpUDS MIPS Catalog
Short Name:
SpUDS MIPSCat
Date:
01 Oct 2018 20:27:19
Publisher:
NASA/IPAC Infrared Science Archive
Description:
Spitzer Public Legacy Survey of the UKIDSS Ultra Deep Survey (SpUDS) is a survey of the ~1 square degree UKIDSS Ultra Deep Survey (UDS). The survey consists of deep IRAC and 24 micron MIPS observations. The UDS is the largest deep near-infrared (JHK) survey in existence, and the first capable of sampling representative cosmological volumes (100x100 Mpc) out to the highest redshifts (z>6).

Limit your search

more »

more »

more »

more »

more »

more »