Search Publications
Observations of Magnetic Fields Surrounding LkHα 101 Taken by the BISTRO Survey with JCMT-POL-2
Zhang, Yapeng; Pattle, Kate; Ward-Thompson, Derek +146 more
We report the first high spatial resolution measurement of magnetic fields surrounding LkHα 101, part of the Auriga-California molecular cloud. The observations were taken with the POL-2 polarimeter on the James Clerk Maxwell Telescope within the framework of the B-fields In Star-forming Region Observations (BISTRO) survey. Observed polarization o…
The Atacama Cosmology Telescope: Probing the baryon content of SDSS DR15 galaxies with the thermal and kinematic Sunyaev-Zel'dovich effects
Bond, J. R.; Calabrese, E.; Huffenberger, K. M. +51 more
We present measurements of the average thermal Sunyaev Zel'dovich (tSZ) effect from optically selected galaxy groups and clusters at high signal-to-noise (up to 12 σ ) and estimate their baryon content within a 2.1' radius aperture. Sources from the Sloan Digital Sky Survey Baryon Oscillation Spectroscopic Survey DR15 catalog overlap wi…
A preserved high-z compact progenitor in the heart of NGC 3311 revealed with MUSE 2D stellar population analysis
Hilker, M.; Richtler, T.; Coccato, L. +3 more
Context. Massive early-type galaxies are believed to be the end result of an extended mass accretion history. The stars formed in situ very early on in the initial phase of the mass assembly might have originated from an extremely intense and rapid burst of star formation. These stars may still be found within the cores of such galaxies at z = 0, …
Stars and gas in the most metal-poor galaxies - I. COS and MUSE observations of SBS 0335-052E
Feltre, Anna; Charlot, Stéphane; Chevallard, Jacopo +5 more
Among the nearest most metal-poor starburst-dwarf galaxies known, SBS 0335-052E is the most luminous in integrated nebular He II λ4686 emission. This makes it a unique target to test spectral synthesis models and spectral interpretation tools of the kind that will be used to interpret future rest-frame UV observations of primeval galaxies. Previou…
The source of the major solar energetic particle events from super active region 11944
Brooks, David H.; Yardley, Stephanie L.
Shock waves associated with fast coronal mass ejections (CMEs) accelerate solar energetic particles (SEPs) in the long duration, gradual events that pose hazards to crewed spaceflight and near-Earth technological assets, but the source of the CME shock-accelerated plasma is still debated. Here, we use multi-messenger observations from the Heliophy…
3D MHD astrospheres: applications to IRC-10414 and Betelgeuse
Meyer, D. M. -A.; Mignone, A.; Petrov, M. +3 more
A significative fraction of all massive stars in the Milky Way move supersonically through their local interstellar medium (ISM), producing bow shock nebulae by wind-ISM interaction. The stability of these observed astrospheres around cool massive stars challenges precedent 2D (magneto-)hydrodynamical (MHD) simulations of their surroundings. We pr…
The Type II supernova SN 2020jfo in M 61, implications for progenitor system, and explosion dynamics
Sollerman, J.; Jerkstrand, A.; Filippenko, A. V. +25 more
We present the discovery and extensive follow-up observations of SN 2020jfo, a Type IIP supernova (SN) in the nearby (14.5 Mpc) galaxy M 61. Optical light curves (LCs) and spectra from the Zwicky Transient Facility (ZTF), complemented with data from Swift/UVOT and near-infrared photometry is presented. These were used to model the 350-day duration…
The ρ Ophiuchi region revisited with Gaia EDR3. Two young populations, new members, and old impostors
Meingast, Stefan; Alves, João; Lombardi, Marco +10 more
Context. Young and embedded stellar populations are important probes of the star formation process. Their properties and the environments they create have the potential to affect the formation of new planets. Paradoxically, we have a better census of nearby embedded young populations than of the slightly more evolved optically visible young popula…
Extensive Lensing Survey of Optical and Near-infrared Dark Objects (El Sonido): HST H-faint Galaxies behind 101 Lensing Clusters
Pérez-González, Pablo G.; Koekemoer, Anton M.; Smail, Ian +22 more
We present a Spitzer/IRAC survey of H-faint (H 160 ≳ 26.4, < 5σ) sources in 101 lensing cluster fields. Across a CANDELS/Wide-like survey area of ~648 arcmin2 (effectively ~221 arcmin2 in the source plane), we have securely discovered 53 sources in the IRAC Channel-2 band (CH2, 4.5 µm; median CH2 = 22.46 ±…
Massive stars in the Small Magellanic Cloud. Evolution, rotation, and surface abundances
Bouret, J. -C.; Martins, F.; Hillier, D. J. +5 more
Context. The evolution of massive stars depends on several physical processes and parameters. Metallicity and rotation are among the most important, but their quantitative effects are not well understood.
Aims: To complement our earlier study on main-sequence stars, we study the evolutionary and physical properties of evolved O stars in the S…