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An Imperfectly Passive Nature: Bright Submillimeter Emission from Dust-obscured Star Formation in the z = 3.717 “Passive” System, ZF 20115
Ivison, R. J.; Smail, Ian; Dunlop, J. S. +28 more
The identification of high-redshift, massive galaxies with old stellar populations may pose challenges to some models of galaxy formation. However, to securely classify a galaxy as quiescent, it is necessary to exclude significant ongoing star formation, something that can be challenging to achieve at high redshifts. In this Letter, we analyze dee…
Observations of the Lyman series forest towards the redshift 7.1 quasar ULAS J1120+0641
Hewett, P. C.; Warren, S. J.; Simpson, C. +5 more
We present a 30 h integration Very Large Telescope X-shooter spectrum of the Lyman series forest towards the z = 7.084 quasar ULAS J1120+0641. The only detected transmission at S/N > 5 is confined to seven narrow spikes in the Lyα forest, over the redshift range 5.858 <z < 6.122, just longward of the wavelength of the onset of the Lyβ for…
Characteristics of Solar Energetic Ions as a Function of Longitude
Cohen, C. M. S.; Mewaldt, R. A.; Mason, G. M.
Since the 2006 launch of STEREO, multi-spacecraft studies have yielded several surprising results regarding the spread of solar energetic particles (SEPs) within the inner heliosphere. We have investigated the role of energy and ridigity, using ACE and STEREO 10 MeV n-1 oxygen data to identify 41 large SEP events observed by two or thre…
The effects of the cluster environment on the galaxy mass-size relation in MACS J1206.2-0847
Häußler, B.; Ziegler, B.; Verdugo, M. +2 more
The dense environment of galaxy clusters strongly influences the nature of galaxies. Their abundance and diversity is imprinted on the stellar-mass-size plane. Here, we study the cause of the size distribution of a sample of 560 spectroscopic members spanning a wide dynamical range down to 108.5M⊙ (log (M)-2) in the massive C…
The cosmic assembly of stellar haloes in massive early-type Galaxies
Pérez-González, Pablo G.; Curtis-Lake, Emma; Trujillo, Ignacio +5 more
Using the exquisite depth of the Hubble Ultra Deep Field (HUDF12 programme) data set, we explore the ongoing assembly of the outermost regions of the most massive galaxies (Mstellar ≥ 5× 1010 M⊙) at z ≤ 1. The outskirts of massive objects, particularly early-type Galaxies (ETGs), are expected to suffer a dramatic t…
CO-driven Activity in Comet C/2017 K2 (PANSTARRS)
Chambers, Kenneth C.; Magnier, Eugene; Bauer, James +12 more
Comet C/2017 K2 (PANSTARRS) was discovered by the Pan-STARRS1 (PS1) Survey on 2017 May 21 at a distance of 16.09 au from the Sun, the second most distant discovery of an active comet. Pre-discovery images in the PS1 archive back to 2014 and additional deep CFHT images between 2013 May 10-13 showed the comet to be active at 23.75 au. We derive an u…
Low mass X-ray binaries in the Inner Galaxy: implications for millisecond pulsars and the GeV excess
Heinke, Craig; Linden, Tim; Haggard, Daryl +1 more
If millisecond pulsars (MSPs) are responsible for the excess gamma-ray emission observed from the region surrounding the Galactic Center, the same region should also contain a large population of low-mass X-ray binaries (LMXBs). In this study, we compile and utilize a sizable catalog of LMXBs observed in the the Milky Way's globular cluster system…
Planck data versus large scale structure: Methods to quantify discordance
Battye, Richard A.; Moss, Adam; Charnock, Tom
Discordance in the Λ cold dark matter cosmological model can be seen by comparing parameters constrained by cosmic microwave background (CMB) measurements to those inferred by probes of large scale structure. Recent improvements in observations, including final data releases from both Planck and SDSS-III BOSS, as well as improved astrophysical unc…
Global Mars-solar wind coupling and ion escape
Barabash, Stas; Nilsson, Hans; Holmström, Mats +2 more
Loss of the early Martian atmosphere is often thought to have occurred due to an effective transfer of the solar wind energy through the Martian induced magnetic barrier to the ionosphere. We have quantified the coupling efficiency by comparing the power of the heavy ion outflow with the available power supplied by the upstream solar wind. Constra…
The 67P/Churyumov-Gerasimenko observation campaign in support of the Rosetta mission
Lasue, J.; Villanueva, G. L.; Lara, L. M. +112 more
We present a summary of the campaign of remote observations that supported the European Space Agency's Rosetta mission. Telescopes across the globe (and in space) followed comet 67P/Churyumov-Gerasimenko from before Rosetta's arrival until nearly the end of the mission in September 2016. These provided essential data for mission planning, large-sc…