Search Publications
The Tully-Fisher relation in dense groups at z ∼ 0.7 in the MAGIC survey
Finley, Hayley; Boogaard, Leindert A.; Brinchmann, Jarle +11 more
Context. Galaxies in dense environments are subject to interactions and mechanisms that directly affect their evolution by lowering their gas fractions and consequently reducing their star-forming capacity earlier than their isolated counterparts.
Aims: The aim of our project is to get new insights into the role of environment in the stellar …
Gaia EDR3 Parallax Distances to the Great Carina Nebula and Its Star Clusters (Trumpler 14, 15, 16)
Shull, J. Michael; Danforth, Charles W.; Darling, Jeremy
Using offset-corrected Gaia EDR3 parallax measurements and spectrophotometric methods, we have determined distances for 69 massive stars in the Carina OB1 association and associated clusters: Trumpler 16 (21 stars), Trumpler 14 (20 stars), Trumpler 15 (three stars), Bochum 11 (five stars), and South Pillars region (20 stars). Past distance estimat…
Progress on the calibration of surface brightness-color relations for early- and late-type stars
Schaefer, G. H.; Perraut, K.; Nardetto, N. +8 more
Context. Surface brightness-color relations (SBCRs) are widely used for estimating angular diameters and deriving stellar properties. They are critical to derive extragalactic distances of early-type and late-type eclipsing binaries or, potentially, for extracting planetary parameters of late-type stars hosting planets. Various SBCRs have been imp…
3D mapping of the Crab Nebula with SITELLE - I. Deconvolution and kinematic reconstruction
Milisavljevic, D.; Drissen, L.; Martin, T.
We present a hyperspectral cube of the Crab Nebula obtained with the imaging Fourier transform spectrometer SITELLE on the Canada-France-Hawaii telescope. We describe our techniques used to deconvolve the 310 000 individual spectra ($R = 9\, 600$) containing Hα, [N II] λλ6548, 6583, and [S II] λλ6716, 6731 emission lines and create a detailed 3D r…
Signature of a Heliotail Organized by the Solar Magnetic Field and the Role of Nonideal Processes in Modeled IBEX ENA Maps: A Comparison of the BU and Moscow MHD Models
Galli, A.; Richardson, J. D.; Zank, G. P. +9 more
Energetic neutral atom (ENA) models typically require post-processing routines to convert the distributions of plasma and H atoms into ENA maps. Here we investigate how two kinetic-MHD models of the heliosphere (the BU and Moscow models) manifest in modeled ENA maps using the same prescription and how they compare with Interstellar Boundary Explor…
Confirming NGC 6231 as the parent cluster of the runaway high-mass X-ray binary HD 153919/4U 1700-37 with Gaia DR2
Kaper, Lex; Renzo, Mathieu; van der Meij, Vincent +1 more
Context. A significant fraction (10-20%) of the most massive stars move through space with a high (v ≳ 30 km s−1) velocity. One of the possible physical explanations is that a supernova in a compact binary system results in a high recoil velocity of the system. If the system remains bound, it can be subsequently observed as a spectrosco…
Chemical analysis of prestellar cores in Ophiuchus yields short timescales and rapid collapse
Wyrowski, Friedrich; Menten, Karl M.; Lupi, Alessandro +4 more
Sun-like stars form from the contraction of cold and dense interstellar clouds. How the collapse proceeds and what the main physical processes are driving it, however, is still under debate and a final consensus on the timescale of the process has not been reached. If the contraction proceeds slowly, supported by strong magnetic fields and mediate…
The GALAH survey: accreted stars also inhabit the Spite plateau
Lewis, Geraint F.; Ting, Yuan-Sen; Casey, Andrew R. +23 more
The European Space Agency (ESA) Gaia mission has enabled the remarkable discovery that a large fraction of the stars near the solar neighbourhood are debris from a single in-falling system, the so-called Gaia-Sausage-Enceladus (GSE). This discovery provides astronomers for the first time with a large cohort of easily observable, unevolved stars th…
Structure and Internal Kinematics of Nine Inner Milky Way Globular Clusters
Brown, Thomas M.; Cohen, Roger E.; Bellini, Andrea +3 more
This study constitutes part of a larger effort aimed at better characterizing the Galactic globular clusters (GGCs) located toward the inner Milky Way bulge and disk. Here, we focus on internal kinematics of nine GGCs, obtained from space-based imaging over time baselines of >9 yr. We exploit multiple avenues to assess the dynamical state of th…
Study of two interacting interplanetary coronal mass ejections encountered by Solar Orbiter during its first perihelion passage. Observations and modeling
Müller, D.; Perri, S.; Romoli, M. +46 more
Context. Solar Orbiter, the new-generation mission dedicated to solar and heliospheric exploration, was successfully launched on February 10, 2020, 04:03 UTC from Cape Canaveral. During its first perihelion passage in June 2020, two successive interplanetary coronal mass ejections (ICMEs), propagating along the heliospheric current sheet (HCS), im…