Search Publications
New Test of Lorentz Invariance Using the MICROSCOPE Space Mission
Métris, Gilles; Rodrigues, Manuel; Touboul, Pierre +11 more
We use data from the T-SAGE instrument on board the MICROSCOPE space mission to search for Lorentz violation in matter-gravity couplings as described by the Lorentz violating standard model extension (SME) coefficients (a¯ eff)µw , where (µ =T , X , Y , Z ) and (w =e , p , n ) for the electron, proton, …
Detecting Thin Stellar Streams in External Galaxies: Resolved Stars and Integrated Light
Williams, Benjamin F.; Ibata, Rodrigo A.; Johnston, Kathryn V. +3 more
The morphology of thin stellar streams can be used to test the nature of dark matter. It is therefore crucial to extend searches for globular cluster (GC) streams to other galaxies than the Milky Way. In this paper, we investigate the current and future prospects of detecting GC streams in external galaxies in resolved stars (e.g., with Wide Field…
The dynamical matter density in the solar neighbourhood inferred from Gaia DR1
Widmark, Axel; Monari, Giacomo
We determine the total dynamical density in the solar neighbourhood using the Tycho-Gaia Astrometric Solution catalogue. Astrometric measurements of proper motion and parallax of stars inform us of both the stellar number density distribution and the velocity distribution of stars close to the plane. Assuming equilibrium, these distributions are i…
A stellar census in globular clusters with MUSE: multiple populations chemistry in NGC 2808
Dreizler, S.; Bastian, N.; Latour, M. +8 more
Context. Galactic globular clusters (GCs) are now known to host multiple populations displaying particular abundance variations. The different populations within a GC can be well distinguished following their position in the pseudo two-colors diagrams, also referred to as "chromosome maps". These maps are constructed using optical and near-UV phot…
Stellar Mass Growth of Brightest Cluster Galaxy Progenitors in COSMOS Since z ∼ 3
Casey, Caitlin M.; Kartaltepe, Jeyhan S.; Le Fèvre, Olivier +5 more
We examine the role of environment on the in situ star formation (SF) hosted by the progenitors of the most massive galaxies in the present-day universe, the brightest cluster galaxies (BCGs), from z ∼ 3 to present in the COSMOS field. Progenitors are selected from the COSMOS field using a stellar mass cut motivated by the evolving cumulative como…
A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2
Brown, A. G. A.; Messineo, M.
We investigate individual distances and luminosities of a sample of 889 nearby candidate red supergiants (RSGs) with reliable parallaxes (ϖ/σ ϖ > 4 and RUWE < 2.7) from Gaia Data Release 2 (DR2). The sample was extracted from the historical compilation of spectroscopically derived spectral types by Skiff, and consists of K-M sta…
Search for Nearby Earth Analogs. I. 15 Planet Candidates Found in PFS Data
Butler, R. Paul; Crane, Jeffrey D.; Thompson, Ian B. +6 more
The radial velocity (RV) method plays a major role in the discovery of nearby exoplanets. To efficiently find planet candidates from the data obtained in high-precision RV surveys, we apply a signal diagnostic framework to detect RV signals that are statistically significant, consistent in time, robust in the choice of noise models, and do not cor…
Simulating MOS science on the ELT: Lyα forest tomography
Kaper, L.; Yang, Y.; Gendron, E. +14 more
Mapping the large-scale structure through cosmic time has numerous applications in studies of cosmology and galaxy evolution. At z ≳ 2, the structure can be traced by the neutral intergalactic medium (IGM) by way of observing the Lyα forest towards densely sampled lines of sight of bright background sources, such as quasars and star-forming galaxi…
An Enormous Molecular Gas Flow in the RX J0821+0752 Galaxy Cluster
Fabian, A. C.; Combes, F.; McDonald, M. +6 more
We present recent Chandra X-ray observations of the RX J0821.0+0752 galaxy cluster, in addition to ALMA observations of the CO(1-0) and CO(3-2) line emission tracing the molecular gas in its central galaxy. All of the CO line emission, originating from a {10}10 {M}⊙ molecular gas reservoir, is located several kiloparsecs awa…
SDSS-IV/SPIDERS: A catalogue of X-ray selected AGN properties. Spectral properties and black hole mass estimates for SPIDERS SDSS DR14 type 1 AGN
Salvato, M.; Schulze, A.; Nandra, K. +7 more
This work presents the catalogue of optical spectral properties for all X-ray selected SPIDERS active galactic nuclei (AGN) up to SDSS DR14. SPIDERS (SPectroscopic IDentification of eROSITA Sources) is an SDSS-IV programme that is currently conducting optical spectroscopy of the counterparts to the X-ray selected sources detected in the ROSAT all-…