Search Publications
QUIJOTE scientific results - I. Measurements of the intensity and polarisation of the anomalous microwave emission in the Perseus molecular complex
Ashdown, M.; Barreiro, R. B.; Dickinson, C. +28 more
In this paper, we present Q-U-I JOint Tenerife Experiment (QUIJOTE) 10-20 GHz observations (194 h in total over ≈250 deg2) in intensity and polarisation of G159.6-18.5, one of the most widely studied regions harbouring anomalous microwave emission (AME). By combining with other publicly available intensity data, we achieve the most prec…
Directly imaging damped Ly α galaxies at z > 2 - III. The star formation rates of neutral gas reservoirs at z ∼ 2.7
Prochaska, J. Xavier; Rafelski, Marc; Fumagalli, Michele +2 more
We present results from a survey designed to probe the star formation properties of 32 damped Lyman α systems (DLAs) at z ∼ 2.7. By using the `double-DLA' technique that eliminates the glare of the bright background quasars, we directly measure the rest-frame far-ultraviolet flux from DLAs and their neighbouring galaxies. At the position of the ab…
WISE measurement of the integrated Sachs-Wolfe effect
Spergel, David N.; Sherwin, Blake D.; Ferraro, Simone
The integrated Sachs-Wolfe (ISW) effect measures the decay of the gravitational potential due to cosmic acceleration and is thus a direct probe of dark energy. In some of the earlier studies, the amplitude of the ISW effect was found to be in tension with the predictions of the standard Lambda cold dark matter (Λ CDM ) model. We measure the cross …
Discovery of an ∼2-h high-frequency X-ray QPO and iron Kα reverberation in the active galaxy MS 2254.9-3712
Fabian, A. C.; Pinto, C.; Lohfink, A. +5 more
We report the discovery of an ∼1.5 × 10-4 Hz (∼2 h) X-ray quasi-periodic oscillation (QPO) in the active galaxy MS 2254.9-3712, using an ∼70 ks XMM-Newton observation. The QPO is significantly detected (∼3.3σ) in the 1.2-5.0 keV band only, connecting its origin with the primary X-ray power-law continuum. We detect a highly coherent soft…
The Star Formation History of BCGs to z = 1.8 from the SpARCS/SWIRE Survey: Evidence for Significant In Situ Star Formation at High Redshift
Muzzin, Adam; Yee, H. K. C.; Hezaveh, Yashar +8 more
We present the results of an MIPS-24 µm study of the brightest cluster galaxies (BCGs) of 535 high-redshift galaxy clusters. The clusters are drawn from the Spitzer Adaptation of the Red-Sequence Cluster Survey, which effectively provides a sample selected on total stellar mass, over 0.2 < z < 1.8 within the Spitzer Wide-Area Infrared …
What Do IRIS Observations of Mg II k Tell Us about the Solar Plage Chromosphere?
De Pontieu, Bart; Carlsson, Mats; Leenaarts, Jorrit
We analyze observations from the Interface Region Imaging Spectrograph of the Mg ii k line, the Mg ii UV subordinate lines, and the O i 135.6 {nm} line to better understand the solar plage chromosphere. We also make comparisons with observations from the Swedish 1-m Solar Telescope of the Hα line, the Ca ii 8542 line, and Solar Dynamics Observator…
An Increasing Stellar Baryon Fraction in Bright Galaxies at High Redshift
Papovich, Casey; Finkelstein, Steven L.; Ferguson, Henry C. +12 more
Recent observations have shown that the characteristic luminosity of the rest-frame ultraviolet (UV) luminosity function does not significantly evolve at 4 < z < 7 and is approximately {M}{UV}*∼ -21. We investigate this apparent non-evolution by examining a sample of 173 bright, MUV < -21 galaxies at z = 4…
The Broadband XMM-Newton and NuSTAR X-Ray Spectra of Two Ultraluminous X-Ray Sources in the Galaxy IC 342
Hailey, Charles J.; Fabian, Andrew C.; Walton, Dominic J. +15 more
We present results for two ultraluminous X-ray sources (ULXs), IC 342 X-1 and IC 342 X-2, using two epochs of XMM-Newton and NuSTAR observations separated by ~7 days. We observe little spectral or flux variability above 1 keV between epochs, with unabsorbed 0.3-30 keV luminosities being 1.04+0.08-0.06 × 1040 erg s<…
Birth of a comet magnetosphere: A spring of water ions
Barabash, Stas; Lundin, Rickard; Henri, Pierre +26 more
The Rosetta mission shall accompany comet 67P/Churyumov-Gerasimenko from a heliocentric distance of >3.6 astronomical units through perihelion passage at 1.25 astronomical units, spanning low and maximum activity levels. Initially, the solar wind permeates the thin comet atmosphere formed from sublimation, until the size and plasma pressure of …
Light Bridge in a Developing Active Region. I. Observation of Light Bridge and its Dynamic Activity Phenomena
Toriumi, Shin; Cheung, Mark C. M.; Katsukawa, Yukio
Light bridges, the bright structures that divide the umbra of sunspots and pores into smaller pieces, are known to produce a wide variety of activity events in solar active regions (ARs). It is also known that the light bridges appear in the assembling process of nascent sunspots. The ultimate goal of this series of papers is to reveal the nature …