Search Publications
ESO 452-SC11: the lowest mass globular cluster with a potential chemical inhomogeneity
Martell, Sarah L.; Simpson, Jeffrey D.; Zucker, Daniel B. +2 more
We present the largest spectroscopic investigation of one of the faintest and least studied stellar clusters of the Milky Way, ESO 452-SC11. Using the Anglo-Australian Telescope AAOmega and Keck High Resolution Echelle Spectrometer spectrographs we have identified 11 members of the cluster and found indications of star-to-star light element abunda…
Dark matter distribution in X-ray luminous galaxy clusters with Emergent Gravity
Pointecouteau, E.; Eckert, D.; Ettori, S. +2 more
We present the radial distribution of the dark matter in two massive, X-ray luminous galaxy clusters, Abell 2142 and Abell 2319, and compare it with the quantity predicted as apparent manifestation of the baryonic mass in the context of the 'Emergent Gravity' scenario, recently suggested from Verlinde. Thanks to the observational strategy of the X…
PHIBSS: exploring the dependence of the CO-H2 conversion factor on total mass surface density at z<1.5
Weiner, Benjamin J.; Sandstrom, Karin M.; Freundlich, Jonathan +10 more
We present an analysis of the relationship between the CO-H2 conversion factor (αCO) and total mass surface density (Σtot) in star-forming galaxies at z < 1.5. Our sample, which is drawn from the IRAM Plateau de Bure HIgh-z Blue Sequence Survey (PHIBSS) and the CO Legacy Database for GASS (COLD GASS), includes '…
Centroid vetting of transiting planet candidates from the Next Generation Transit Survey
Wheatley, Peter J.; Bayliss, Daniel; Moyano, Maximiliano +25 more
The Next Generation Transit Survey (NGTS), operating in Paranal since 2016, is a wide-field survey to detect Neptunes and super-Earths transiting bright stars, which are suitable for precise radial velocity follow-up and characterization. Thereby, its sub-mmag photometric precision and ability to identify false positives are crucial. Particularly,…
The Betelgeuse Project: constraints from rotation
Zhou, L.; Wheeler, J. Craig; Nance, S. +6 more
In order to constrain the evolutionary state of the red supergiant Betelgeuse (α Orionis), we have produced a suite of models with zero-age main sequence masses from 15 to 25 M⊙ in intervals of 1 M⊙ including the effects of rotation. The models were computed with the stellar evolutionary code MESA. For non-rotating models, we…
Weak lensing and spectroscopic analysis of the nearby dissociative merging galaxy cluster Abell 3376
Durret, F.; Cypriano, E. S.; Laganá, T. F. +5 more
The galaxy cluster Abell 3376 is a nearby (\bar{z}=0.046) dissociative merging cluster surrounded by two prominent radio relics and showing an X-ray comet-like morphology. The merger system is comprised of the subclusters A3376W and A3376E. Based on new deep multiwavelength large-field images and published redshifts, we bring new insights about th…
Structure and physical conditions in the Huygens region of the Orion nebula
O'Dell, C. R.; Ferland, G. J.; Peimbert, M.
Hubble Space Telescope images, MUSE maps of emission lines, and an atlas of high velocity resolution emission-line spectra have been used to establish for the first time correlations of the electron temperature, electron density, radial velocity, turbulence, and orientation within the main ionization front of the nebula. From the study of the comb…
Lighthouse in the dust: infrared echoes of periodic emission from massive black hole binaries★
Haiman, Zoltán; D'Orazio, Daniel J.
The optical and UV emission from sub-parsec massive black hole binaries (MBHBs) in active galactic nuclei (AGNs) is believed to vary periodically, on time-scales comparable to the binary's orbital time. If driven by accretion rate fluctuations, the variability could be isotropic. If dominated by relativistic Doppler modulation, the variability sho…
Geomorphology of comet 67P/Churyumov-Gerasimenko
Soderblom, J. M.; Sierks, H.; Vincent, J. -B. +10 more
We present a global geomorphological map of comet 67P/Churyumov-Gerasimenko (67P/C-G) using data acquired by the Rosetta Orbiter's OSIRIS Narrow Angle Camera. The images used in our study were acquired between 2014 August and 2015 May, before 67P/C-G passed through perihelion. Imagery of the Southern hemisphere was included in our study, allowing …
The abundance of compact quiescent galaxies since z ∼ 0.6
Erben, Thomas; Hildebrandt, Hendrik; Huertas-Company, Marc +12 more
We set out to quantify the number density of quiescent massive compact galaxies at intermediate redshifts. We determine structural parameters based on I-band imaging using the Canada-France-Hawaii Telescope (CFHT) equatorial Sloan Digital Sky Survey (SDSS) Stripe 82 (CS82) survey (∼170 deg2) taking advantage of an exquisite median seein…