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Feedback from massive stars at low metallicities: MUSE observations of N44 and N180 in the Large Magellanic Cloud
Testi, L.; Evans, C. J.; Kruijssen, J. M. D. +5 more
We present MUSE integral field data of two H II region complexes in the Large Magellanic Cloud: N44 and N180. Both regions consist of a main superbubble and a number of smaller, more compact H II regions that formed on the edge of the superbubble. For a total of 11 H II regions, we systematically analyse the radiative and mechanical feedback from …
A new RASS galaxy cluster catalogue with low contamination extending to z ∼ 1 in the DES overlap region
Smith, M.; D'Andrea, C. B.; Abbott, T. M. C. +63 more
We present the MARD-Y3 catalogue of between 1086 and 2171 galaxy clusters (52 per cent and 65 per cent new) produced using multicomponent matched filter (MCMF) follow-up in 5000 deg2 of DES-Y3 optical data of the ∼20 000 overlapping ROSAT All-Sky Survey source catalogue (2RXS) X-ray sources. Optical counterparts are identified as peaks …
The lowest detected stellar Fe abundance: the halo star SMSS J160540.18-144323.1
Schmidt, B. P.; Da Costa, G. S.; Marino, A. F. +12 more
We report the discovery of SMSS J160540.18-144323.1, a new ultra metal-poor halo star discovered with the SkyMapper telescope. We measure [{Fe}/{H}]= -6.2 ± 0.2 (1D LTE), the lowest ever detected abundance of iron in a star. The star is strongly carbon-enhanced, [{C}/{Fe}] = 3.9 ± 0.2, while other abundances are compatible with an α-enhanced solar…
The First Detection of 13C17O in a Protoplanetary Disk: A Robust Tracer of Disk Gas Mass
Booth, Alice S.; Ilee, John D.; Walsh, Catherine +4 more
Measurements of the gas mass are necessary to determine the planet formation potential of protoplanetary disks. Observations of rare CO isotopologues are typically used to determine disk gas masses; however, if the line emission is optically thick this will result in an underestimated disk mass. With the Atacama Large Millimeter/submillimeter Arra…
High gas-to-dust size ratio indicating efficient radial drift in the mm-faint CX Tauri disk
Tazzari, M.; Facchini, S.; Manara, C. F. +7 more
The large majority of protoplanetary disks have very compact continuum emission (≲15 AU) at millimeter wavelengths. However, high angular resolution observations that resolve these small disks are still lacking, due to their intrinsically fainter emission compared with large bright disks. In this Letter we present 1.3 mm ALMA data of the faint dis…
On the Mass Function, Multiplicity, and Origins of Wide-orbit Giant Planets
Wagner, Kevin; Apai, Dániel; Kratter, Kaitlin M.
A major outstanding question regarding the formation of planetary systems is whether wide-orbit giant planets form differently than close-in giant planets. We aim to establish constraints on two key parameters that are relevant for understanding the formation of wide-orbit planets: (1) the relative mass function and (2) the fraction of systems hos…
Multiphase circumgalactic medium probed with MUSE and ALMA
Pettini, Max; York, Donald G.; Hamanowicz, Aleksandra +9 more
Galaxy haloes appear to be missing a large fraction of their baryons, most probably hiding in the circumgalactic medium (CGM), a diffuse component within the dark matter halo that extends far from the inner regions of the galaxies. A powerful tool to study the CGM gas is offered by absorption lines in the spectra of background quasars. Here, we pr…
The Close AGN Reference Survey (CARS). A massive multi-phase outflow impacting the edge-on galaxy HE 1353-1917
Gaspari, M.; Combes, F.; Scharwächter, J. +15 more
Context. Galaxy-wide outflows driven by star formation and/or an active galactic nucleus (AGN) are thought to play a crucial rule in the evolution of galaxies and the metal enrichment of the inter-galactic medium. Direct measurements of these processes are still scarce and new observations are needed to reveal the nature of outflows in the majorit…
Testing the Radius Scaling Relation with Gaia DR2 in the Kepler Field
Huber, Daniel; Stello, Dennis; Serenelli, Aldo +3 more
We compare radii based on Gaia parallaxes to radii based on asteroseismic scaling relations for ∼300 dwarfs and subgiants and ∼3600 first-ascent giants from the Kepler mission. Systematics due to temperature, bolometric correction, extinction, asteroseismic radius, and the spatially correlated Gaia parallax zero-point contribute to a 2% systematic…
Spectacular Hubble Space Telescope Observations of the Coma Galaxy D100 and Star Formation in Its Ram Pressure-stripped Tail
Sun, M.; Yagi, M.; Roediger, E. +5 more
We present new HST F275W, F475W, and F814W imaging of the region of the Coma cluster around D100, a spiral galaxy with a remarkably long and narrow (60 × 1.5 kpc) ram pressure-stripped gas tail. We find blue sources coincident with the Hα tail, which we identify as young stars formed in the tail. We also determine they are likely to be unbound ste…