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Interstellar Detection of Methyl Isocyanate CH3NCO in Sgr B2(N): A Link from Molecular Clouds to Comets
Ziurys, L. M.; Halfen, D. T.; Ilyushin, V. V.
A new interstellar molecule, CH3NCO (methyl isocyanate), has been detected using the 12 m telescope of the Arizona Radio Observatory (ARO). CH3NCO was identified in spectra covering 48 GHz (68-116 GHz) in the 3 mm segment of a broadband survey of Sgr B2(N). Thirty very favorable rotational lines (Ka = 0 and Ka…
Fractures on comet 67P/Churyumov-Gerasimenko observed by Rosetta/OSIRIS
Jorda, L.; Lamy, P. L.; Lara, L. M. +50 more
The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) experiment onboard the Rosetta spacecraft currently orbiting comet 67P/Churyumov-Gerasimenko has yielded unprecedented views of a comet's nucleus. We present here the first ever observations of meter-scale fractures on the surface of a comet. Some of these fractures form polyg…
Determining the Covering Factor of Compton-thick Active Galactic Nuclei with NuSTAR
Harrison, F. A.; Stern, D.; Zhang, W. W. +19 more
The covering factor of Compton-thick (CT) obscuring material associated with the torus in active galactic nuclei (AGNs) is at present best understood through the fraction of sources exhibiting CT absorption along the line of sight (NH > 1.5 × 1024 cm-2) in the X-ray band, which reveals the average covering facto…
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…