Search Publications
A Chemical Composition Survey of the Iron-complex Globular Cluster NGC 6273 (M19)
Clarkson, William I.; Caldwell, Nelson; Rich, R. Michael +5 more
Recent observations have shown that a growing number of the most massive Galactic globular clusters contain multiple populations of stars with different [Fe/H] and neutron-capture element abundances. NGC 6273 has only recently been recognized as a member of this “iron-complex” cluster class, and we provide here a chemical and kinematic analysis of…
Physical Properties of Sub-galactic Clumps at 0.5 ≤ Z ≤ 1.5 in the UVUDF
Grogin, Norman A.; Koekemoer, Anton M.; Ravindranath, Swara +8 more
We present an investigation of clumpy galaxies in the Hubble Ultra Deep Field at 0.5≤slant z≤slant 1.5 in the rest-frame far-ultraviolet (FUV) using Hubble Space Telescope Wide Field Camera 3 broadband imaging in F225W, F275W, and F336W. An analysis of 1404 galaxies yields 209 galaxies that host 403 kpc scale clumps. These host galaxies appear to …
The Tarantula Massive Binary Monitoring. II. First SB2 orbital and spectroscopic analysis for the Wolf-Rayet binary R145
Ulaczyk, K.; Sander, A.; Crowther, P. A. +19 more
We present the first SB2 orbital solution and disentanglement of the massive Wolf-Rayet binary R145 (P = 159 d) located in the Large Magellanic Cloud. The primary was claimed to have a stellar mass greater than 300 M⊙, making it a candidate for being the most massive star known to date. While the primary is a known late-type, H-rich Wol…
Probing changes of dust properties along a chain of solar-type prestellar and protostellar cores in Taurus with NIKA
Adam, R.; Benoît, A.; Catalano, A. +45 more
The characterization of dust properties in the interstellar medium is key for understanding the physics and chemistry of star formation. Mass estimates are crucial to determine gravitational collapse conditions for the birth of new stellar objects in molecular clouds. However, most of these estimates rely on dust models that need further observati…
Giant ripples on comet 67P/Churyumov-Gerasimenko sculpted by sunset thermal wind
Jia, Pan; Andreotti, Bruno; Claudin, Philippe
Explaining the unexpected presence of dune-like patterns at the surface of the comet 67P/Churyumov-Gerasimenko requires conceptual and quantitative advances in the understanding of surface and outgassing processes. We show here that vapor flow emitted by the comet around its perihelion spreads laterally in a surface layer, due to the strong pressu…
The JCMT Plane Survey: first complete data release - emission maps and compact source catalogue
Martin, P. G.; White, G. J.; Moore, T. J. T. +42 more
We present the first data release of the James Clerk Maxwell Telescope Plane Survey (JPS), the JPS Public Release 1. JPS is an 850-µm continuum survey of six fields in the northern inner Galactic plane in a longitude range of ℓ = 7°-63°, made with the Submillimetre Common-User Bolometer Array 2. This first data release consists of emission m…
Observational consequences of optical band milliarcsec-scale structure in active galactic nuclei discovered by Gaia
Petrov, L.; Kovalev, Y. Y.
We interpret the recent discovery of a preferred very long baseline interferometry (VLBI)/Gaia offset direction for radio-loud active galactic nuclei (AGNs) along pc-scale radio jets as a manifestation of their optical structure on scales of 1-100 milliarcsec (mas). The extended jet structure affects the Gaia position more strongly than the VLBI p…
The HIP 79977 debris disk in polarized light
Ménard, F.; Quanz, S. P.; Siebenmorgen, R. +40 more
Context. Debris disks are observed around 10 to 20% of FGK main-sequence stars as infrared excess emission. They are important signposts for the presence of colliding planetesimals and therefore provide important information about the evolution of planetary systems. Direct imaging of such disks reveals their geometric structure and constrains thei…
Haro 11: Where is the Lyman Continuum Source?
Jaskot, Anne E.; James, Bethan L.; Oey, M. S. +1 more
Identifying the mechanism by which high-energy Lyman continuum (LyC) photons escaped from early galaxies is one of the most pressing questions in cosmic evolution. Haro 11 is the best known local LyC-leaking galaxy, providing an important opportunity to test our understanding of LyC escape. The observed LyC emission in this galaxy presumably origi…
The Lyman continuum escape and ISM properties in Tololo 1247-232 - new insights from HST and VLA★
Östlin, G.; Hayes, M.; Zackrisson, E. +7 more
Low- and intermediate-mass galaxies are widely discussed as cause of reionization at redshift z ∼ 10-6. However, observational proof of galaxies that are leaking ionizing radiation (Lyman continuum; LyC) is a currently ongoing challenge and the list of LyC emitting candidates is still short. Tololo 1247-232 is among those very few galaxies with re…