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A titanic interstellar medium ejection from a massive starburst galaxy at redshift 1.4
Calabrò, Antonello; Circosta, Chiara; Perna, Michele +12 more
Feedback-driven winds from star formation or active galactic nuclei might be a relevant channel for the abrupt quenching of star formation in massive galaxies. However, both observations and simulations support the idea that these processes are non-conflictingly co-evolving and self-regulating. Furthermore, evidence of disruptive events that are c…
Hot planets around cool stars - two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
Fridlund, M.; Guenther, E. W.; Barragán, O. +56 more
We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 - a low metallicity K6 V dwarf star. Photometry from Transiting Exoplanet Survey Satellite(TESS) yields radii of Rb = 2.33 ± 0.10 and Rc = 2.82 ± 0.15 R⊕, and p…
The HST See Change Program. I. Survey Design, Pipeline, and Supernova Discoveries
Richard, Johan; Muzzin, Adam; Hoekstra, Henk +53 more
The See Change survey was designed to make z > 1 cosmological measurements by efficiently discovering high-redshift Type Ia supernovae (SNe Ia) and improving cluster mass measurements through weak lensing. This survey observed twelve galaxy clusters with the Hubble Space Telescope (HST) spanning the redshift range z = 1.13-1.75, discovering 57 …
The reduced proper motion selected halo: Methods and description of the catalogue
Helmi, Amina; Koppelman, Helmer H.
Context. The Gaia mission has provided the largest ever astrometric chart of the Milky Way. Using it to map the Galactic halo is helpful for disentangling its merger history.
Aims: The identification of halo stars in Gaia DR2 with reliable distance estimates requires special methods because such stars are typically farther away and scarce.
Identification of new classical Ae stars in the Galaxy using LAMOST DR5
Arun, R.; Mathew, Blesson; Kartha, Sreeja S. +6 more
We report the first systematic study to identify and characterize a sample of classical Ae stars in the Galaxy. The spectra of these stars were retrieved from the A-star catalogue using the Large sky Area Multi-Object fibre Spectroscopic Telescope (LAMOST) survey. We identified the emission-line stars in this catalogue from which 159 are confirmed…
Proper motions of OB stars in the far Carina Arm
Monguió, M.; Wright, N. J.; Drew, J. E.
In large-scale maps of the Galactic disc, the Carina Arm stands out as a clear spiral feature, hosting prominent star clusters and associations rich in massive stars. We study the proper motions of 4199 O and early B most likely in the far Carina Arm, at distances mainly in excess of 4 kpc from the Sun, within the sky region, 282° < ℓ < 294°…
Jupiter's Auroral Radio Emissions Observed by Cassini: Rotational Versus Solar Wind Control, and Components Identification
Cecconi, B.; Lamy, L.; Zarka, P. +5 more
Reanalyzing Cassini radio observations performed during Jupiter's flyby of 2000-2001, we study the internal (rotational) versus external (solar wind) control of Jupiter's radio emissions, from kilometer to decameter wavelengths, and the relations between the different auroral radio components. For that purpose, we build a database of the occurrenc…
New observations of NGC 1624-2 reveal a complex magnetospheric structure and underlying surface magnetic geometry
Wade, G. A.; Fullerton, A. W.; Shultz, M. E. +5 more
NGC 1624-2 is the most strongly magnetized O-type star known. Previous spectroscopic observations of this object in the ultraviolet provided evidence that it hosts a large and dense circumstellar magnetosphere. Follow-up observations obtained with the Hubble Space Telescope not only confirm that previous inference, but also suggest that NGC 1624-2…
Giant star-forming complexes in high-z main-sequence galaxy analogues: the internal structure of clumps in DYNAMO galaxies
Glazebrook, Karl; Lenkić, Laura; Bolatto, Alberto D. +4 more
To indirectly study the internal structure of giant clumps in main sequence galaxies at z ~ 1-3, we target very turbulent and gas-rich local analogues from the DYNAMO sample with the Hubble Space Telescope, over a wavelength range of ~200-480 nm. We present a catalogue of 58 clumps identified in six DYNAMO galaxies, including the WFC3/UVIS F225W, …
SN 2018agk: A Prototypical Type Ia Supernova with a Smooth Power-law Rise in Kepler (K2)
Pál, András; Barclay, Thomas; Kilpatrick, Charles D. +73 more
We present the 30 minutes cadence Kepler/K2 light curve of the Type Ia supernova (SN Ia) SN 2018agk, covering approximately one week before explosion, the full rise phase, and the decline until 40 days after peak. We additionally present ground-based observations in multiple bands within the same time range, including the 1 day cadence DECam obser…