Search Publications
Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg2 of the South Pole Telescope Survey
Gladders, M. D.; Rest, A.; Foley, R. J. +77 more
We use measurements from the South Pole Telescope (SPT) Sunyaev-Zel'dovich (SZ) cluster survey in combination with X-ray measurements to constrain cosmological parameters. We present a statistical method that fits for the scaling relations of the SZ and X-ray cluster observables with mass while jointly fitting for cosmology. The method is generali…
Detection of Equatorward Meridional Flow and Evidence of Double-cell Meridional Circulation inside the Sun
Kosovichev, A. G.; Zhao, Junwei; Duvall, T. L., Jr. +2 more
Meridional flow in the solar interior plays an important role in redistributing angular momentum and transporting magnetic flux inside the Sun. Although it has long been recognized that the meridional flow is predominantly poleward at the Sun's surface and in its shallow interior, the location of the equatorward return flow and the meridional flow…
Scanamorphos: A Map-making Software for Herschel and Similar Scanning Bolometer Arrays
Roussel, H.
Scanamorphos is one of the public softwares available to post-process scan observations performed with the Herschel photometer arrays. This post-processing mainly consists in subtracting the total low-frequency noise (both its thermal and non-thermal components), masking high-frequency artefacts such as cosmic ray hits, and projecting the data ont…
Discovery of a relation between black hole mass and soft X-ray time lags in active galactic nuclei
Cappi, M.; Ponti, G.; Fabian, A. C. +5 more
We carried out a systematic analysis of time lags between X-ray energy bands in a large sample (32 sources) of unabsorbed, radio quiet active galactic nuclei (AGN), observed by XMM-Newton. The analysis of X-ray lags (up to the highest/shortest frequencies/time-scales), is performed in the Fourier-frequency domain, between energy bands where the so…
Newly Quenched Galaxies as the Cause for the Apparent Evolution in Average Size of the Population
Ilbert, O.; Taniguchi, Y.; Capak, P. +10 more
We use the large COSMOS sample of galaxies to study in an internally self-consistent way the change in the number densities of quenched early-type galaxies (Q-ETGs) of a given size over the redshift interval 0.2 < z < 1 in order to study the claimed size evolution of these galaxies. In a stellar mass bin at 1010.5 < M gala…
Solar Wind Turbulence and the Role of Ion Instabilities
Bale, S. D.; Alexandrova, O.; Horbury, T. S. +2 more
Solar wind is probably the best laboratory to study turbulence in astrophysical plasmas. In addition to the presence of magnetic field, the differences with neutral fluid isotropic turbulence are: (i) weakness of collisional dissipation and (ii) presence of several characteristic space and time scales. In this paper we discuss observational proper…
How to Distinguish between Cloudy Mini-Neptunes and Water/Volatile-dominated Super-Earths
Seager, Sara; Benneke, Björn
One of the most profound questions about the newly discovered class of low-density super-Earths is whether these exoplanets are predominately H2-dominated mini-Neptunes or volatile-rich worlds with gas envelopes dominated by H2O, CO2, CO, CH4, or N2. Transit observations of the super-Earth GJ …
A galaxy rapidly forming stars 700 million years after the Big Bang at redshift 7.51
Dickinson, M.; Ferguson, H. C.; Finkelstein, S. L. +18 more
Of several dozen galaxies observed spectroscopically that are candidates for having a redshift (z) in excess of seven, only five have had their redshifts confirmed via Lyman α emission, at z = 7.008, 7.045, 7.109, 7.213 and 7.215 (refs 1, 2, 3, 4). The small fraction of confirmed galaxies may indicate that the neutral fraction in the intergalactic…
Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-line Spectroscopy
Savage, Blair D.; Shull, J. Michael; Danforth, Charles W. +5 more
The circumgalactic medium (CGM) of late-type galaxies is characterized using UV spectroscopy of 11 targeted QSO/galaxy pairs at z <= 0.02 with the Hubble Space Telescope Cosmic Origins Spectrograph (COS) and ~60 serendipitous absorber/galaxy pairs at z <= 0.2 with the Space Telescope Imaging Spectrograph. CGM warm cloud properties are derive…
The UV Luminosity Function of Star-forming Galaxies via Dropout Selection at Redshifts z ~ 7 and 8 from the 2012 Ultra Deep Field Campaign
Ono, Yoshiaki; Ouchi, Masami; Stark, Daniel P. +13 more
We present a catalog of high-redshift star-forming galaxies selected to lie within the redshift range z ~= 7-8 using the Ultra Deep Field 2012 (UDF12), the deepest near-infrared (near-IR) exposures yet taken with the Hubble Space Telescope (HST). As a result of the increased near-IR exposure time compared to previous HST imaging in this field, we …