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Galaxy populations in the most distant SPT-SZ clusters. I. Environmental quenching in massive clusters at 1.4 ≲ z ≲ 1.7
Bayliss, M. B.; Sharon, K.; Schrabback, T. +25 more
We present the first results from a galaxy population study in the highest redshift galaxy clusters identified in the 2500 deg2 South Pole Telescope Sunyaev Zel'dovich effect (SPT-SZ) survey, which is sensitive to M500 ≳ 3 × 1014 M⊙ clusters from z ∼ 0.2 out to the highest redshifts where such massive st…
Evidence of ubiquitous Alfvén pulses transporting energy from the photosphere to the upper chromosphere
Wang, Yuming; Liu, Jiajia; Erdélyi, Robert +2 more
The multi-million degree temperature increase from the middle to the upper solar atmosphere is one of the most fascinating puzzles in plasma-astrophysics. Although magnetic waves might transport enough energy from the photosphere to heat up the local chromosphere and corona, observationally validating their ubiquity has proved challenging. Here, w…
New light on the Gaia DR2 parallax zero-point: influence of the asteroseismic approach, in and beyond the Kepler field
Khan, S.; Cantat-Gaudin, T.; Chaplin, W. J. +15 more
The importance of studying the Gaia DR2 parallax zero-point by external means was underlined by the articles that accompanied the release, and initiated by several works making use of Cepheids, eclipsing binaries, and asteroseismology. Despite a very efficient elimination of basic-angle variations, a small fluctuation remains and shows up as a sma…
X-ray emission of z > 2.5 active galactic nuclei can be obscured by their host galaxies
Feltre, A.; Massardi, M.; Vignali, C. +6 more
We present a multiwavelength study of seven active galactic nuclei (AGN) at spectroscopic redshift >2.5 in the 7 Ms Chandra Deep Field South that were selected for their good far-infrared (FIR) and submillimeter (submm) detections. Our aim is to investigate the possibility that the obscuration observed in the X-rays can be produced by the inter…
MOBSTER - II. Identification of rotationally variable A stars observed with TESS in sectors 1-4
Wade, G. A.; Neiner, C.; Paunzen, E. +7 more
Recently, high-precision optical 2-min cadence light curves obtained with TESS for targets located in the mission's defined first four sectors have been released. The majority of these high-cadence and high-precision measurements currently span {∼ }28 d, thereby allowing periodic variability occurring on time-scales {≲ }14 d to potentially be dete…
Period spacings of γ Doradus pulsators in the Kepler field: Rossby and gravity modes in 82 stars
Li, Gang; Bedding, Timothy R.; Antoci, Victoria +2 more
Rossby modes are the oscillations in a rotating fluid, whose restoring force is the Coriolis force. They provide an additional diagnostic to understand the rotation of stars, which complicates asteroseismic modelling. We report 82 γ Doradus stars for which clear period spacing patterns of both gravity and Rossby modes have been detected. The perio…
A possibly inflated planet around the bright young star DS Tucanae A
Sabotta, S.; Messina, S.; D'Orazi, V. +13 more
Context. The origin of the observed diversity of planetary system architectures is one of the main topics of exoplanetary research. The detection of a statistically significant sample of planets around young stars allows us to study the early stages of planet formation and evolution, but only a handful are known so far. In this regard a considerab…
The non-uniformity of galaxy cluster metallicity profiles
Lovisari, L.; Reiprich, T. H.
We study a sample of 207 nearby galaxy groups and clusters observed with XMM-Newton. Key aspects of this sample include the large size, the high data quality, and the large diversity of cluster dynamical states. We determine the overall metallicity within 0.3 R500 and the radial distribution of the metals. On average, we find a mild dep…
Ambient Column Densities of Highly Ionized Oxygen in Precipitation-limited Circumgalactic Media
Voit, G. Mark
Many of the baryons associated with a galaxy reside in its circumgalactic medium (CGM), in a diffuse volume-filling phase at roughly the virial temperature. Much of the oxygen produced over cosmic time by the galaxy’s stars also ends up there. The resulting absorption lines in the spectra of UV and X-ray background sources are powerful diagnostics…
Organic chemistry in the innermost, infalling envelope of the Class 0 protostar L483
Choi, Minho; Di Francesco, James; Lee, Jeong-Eun +3 more
Context. Observations of the innermost regions of deeply embedded protostellar cores have revealed complicated physical structures as well as a rich chemistry with the existence of complex organic molecules. The protostellar envelopes, outflow, and large-scale chemistry of Class 0 and Class I objects have been well studied, but while previous work…