Search Publications
The pattern speed of the Milky Way bar from transverse velocities
Evans, N. Wyn; Sanders, Jason L.; Smith, Leigh
We use the continuity equation to derive a method for measuring the pattern speed of the Milky Way's bar/bulge from proper motion data. The method has minimal assumptions but requires complete coverage of the non-axisymmetric component in two of the three Galactic coordinates. We apply our method to the proper motion data from a combination of Gai…
The GREATS H β + [O III] luminosity function and galaxy properties at z ∼ 8: walking the way of JWST
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +5 more
The James Webb Space Telescope will allow to spectroscopically study an unprecedented number of galaxies deep into the reionization era, notably by detecting [O III]λλ4959, 5007, and H β nebular emission lines. To efficiently prepare such observations, we photometrically select a large sample of galaxies at z ∼ 8 and study their rest-frame optical…
Ingredients for solar-like systems: protostar IRAS 16293-2422 B versus comet 67P/Churyumov-Gerasimenko
van Dishoeck, Ewine F.; Drozdovskaya, Maria N.; Jørgensen, Jes K. +2 more
Our modern day Solar System has 4.6 × 109 yr of evolution behind it with just a few relics of its birth conditions remaining. Comets are thought to be some of the most pristine tracers of the initial ingredients that were combined to produce the Earth and the other planets. Other low-mass protostars may be analogous to our proto-Sun and…
The origin of galactic metal-rich stellar halo components with highly eccentric orbits
Springel, Volker; Grand, Robert J. J.; Gómez, Facundo A. +6 more
Using the astrometry from the ESA's Gaia mission, previous works have shown that the Milky Way stellar halo is dominated by metal-rich stars on highly eccentric orbits. To shed light on the nature of this prominent halo component, we have analysed 28 Galaxy analogues in the Auriga suite of cosmological hydrodynamics zoom-in simulations. Some three…
Piercing the Milky Way: an all-sky view of the Orphan Stream
Li, T. S.; Evans, N. W.; Belokurov, V. +14 more
We use astrometry, broad-band photometry, and variability information from the Data Release 2 of ESA's Gaia mission (GDR2) to identify members of the Orphan Stream (OS) across the whole sky. The stream is traced above and below the celestial equator and in both Galactic hemispheres, thus increasing its visible length to ∼210° equivalent to ∼150 kp…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XIX. A chemical tagging of the multiple stellar populations over the chromosome maps
Anderson, J.; Milone, A. P.; Cordoni, G. +8 more
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters (GCs) has investigated GCs and their stellar populations. In previous papers of this series we have introduced a pseudo two-colour diagram, or `chromosome map' (ChM) that maximizes the separation between the multiple populations. We have identified two main classes of GCs: T…
Homogeneous photometry - VII. Globular clusters in the Gaia era
Pancino, E.; Sanna, N.; Stetson, P. B. +2 more
We present wide-field, ground-based Johnson-Cousins UBVRI photometry for 48 Galactic globular clusters based on about 90 000 public and proprietary images. The photometry is calibrated with the latest transformations obtained in the framework of our secondary standard project, with typical internal and external uncertainties of order a few millima…
Model independent H(z) reconstruction using the cosmic inverse distance ladder
Efstathiou, George; Lemos, Pablo; Lee, Elizabeth +1 more
Recent distance ladder determinations of the Hubble constant H0 disagree at about the 3.5σ level with the value determined from Planck measurements of the cosmic microwave background (CMB) assuming a ΛCDM† cosmology. This discrepancy has prompted speculation that new physics might be required beyond that assumed in the ΛCDM m…
Red and dead CANDELS: massive passive galaxies at the dawn of the Universe
Castellano, M.; Pentericci, L.; Santini, P. +7 more
We search the five CANDELS fields (COSMOS, EGS, GOODS-North, GOODS-South, and UDS) for passively evolving a.k.a. `red and dead' massive galaxies in the first 2 Gyr after the big bang, integrating and updating the work on GOODS-South presented in a previous paper. We perform SED-fitting on photometric data, with top-hat star-formation histories to …
Phat ELVIS: The inevitable effect of the Milky Way's disc on its dark matter subhaloes
Bullock, James S.; Kelley, Tyler; Garrison-Kimmel, Shea +3 more
We introduce an extension of the ELVIS project to account for the effects of the Milky Way galaxy on its subhalo population. Our simulation suite, Phat ELVIS, consists of 12 high-resolution cosmological dark matter-only (DMO) zoom simulations of Milky Way-size ΛCDM haloes [Mv = (0.7-2) × 1012 M⊙] along with 12 re-r…