Search Publications
The Open Cluster Chemical Abundances and Mapping Survey. II. Precision Cluster Abundances for APOGEE Using SDSS DR14
Bizyaev, Dmitry; Pan, Kaike; Cunha, Katia +12 more
The Open Cluster Chemical Abundances and Mapping (OCCAM) survey aims to produce a comprehensive, uniform, infrared-based spectroscopic data set for hundreds of open clusters, and to constrain key Galactic dynamical and chemical parameters from this sample. This second contribution from the OCCAM survey presents analysis of 259 member stars with [F…
Characterizing circumgalactic gas around massive ellipticals at z ∼ 0.4 - I. Initial results
Weiner, Benjamin J.; Johnson, Sean D.; Zahedy, Fakhri S. +4 more
We present a new Hubble Space Telescope Cosmic Origins Spectrograph (COS) absorption-line survey to study halo gas around 16 luminous red galaxies (LRGs) at z = 0.21-0.55. The LRGs are selected uniformly with stellar mass M_star>10^{11} M_{⊙} and no prior knowledge of the presence/absence of any absorption features. Based on observations of the…
Methane on Mars and Habitability: Challenges and Responses
Hu, Renyu; Forget, Francois; Lefèvre, Franck +35 more
Fraction of bolometric luminosity absorbed by dust in DustPedia galaxies
Bianchi, S.; Madden, S. C.; Galliano, F. +16 more
Aims: We aim to study the fraction of stellar radiation absorbed by dust, fabs, in 814 galaxies of different morphological types. The targets constitute the vast majority (93%) of the DustPedia sample, including almost all large (optical diameter larger than 1'), nearby (v ≤ 3000 km s-1) galaxies observed with the Hersch…
The Intrinsic Characteristics of Galaxies on the SFR-M ∗ Plane at 1.2 < z < 4: I. The Correlation between Stellar Age, Central Density, and Position Relative to the Main Sequence
Ferguson, Henry C.; Giavalisco, Mauro; Kartaltepe, Jeyhan S. +12 more
We use the deep CANDELS observations in the GOODS North and South fields to revisit the correlations between stellar mass (M *), star formation rate (SFR) and morphology, and to introduce a fourth dimension, the mass-weighted stellar age, in galaxies at 1.2< z< 4. We do this by making new measures of M *, SFR, and stell…
The nature of the lithium enrichment in the most Li-rich giant star
Zhao, Gang; Gao, Qi; Yan, Hong-Liang +13 more
About 1% of giant stars1 have anomalously high Li abundances (ALi) in their atmospheres, conflicting directly with the prediction of standard stellar evolution models2. This finding makes the production and evolution of Li in the Universe intriguing, not only in the sense of Big Bang nucleosynthesis3,4 o…
Forward Modeling of Coronal Mass Ejection Flux Ropes in the Inner Heliosphere with 3DCORE
Palmerio, E.; Möstl, C.; Farrugia, C. J. +7 more
Forecasting the geomagnetic effects of solar storms, known as coronal mass ejections (CMEs), is currently severely limited by our inability to predict the magnetic field configuration in the CME magnetic core and by observational effects of a single spacecraft trajectory through its 3-D structure. CME magnetic flux ropes can lead to continuous for…
HST Grism Confirmation of 16 Structures at 1.4 < z < 2.8 from the Clusters Around Radio-Loud AGN (CARLA) Survey
Noirot, Gaël; Gonzalez, Anthony H.; Stanford, S. A. +13 more
We report spectroscopic results from our 40-orbit Hubble Space Telescope slitless grism spectroscopy program observing the 20 densest Clusters Around Radio-Loud AGN (CARLA) candidate galaxy clusters at 1.4 < z < 2.8. These candidate rich structures, among the richest and most distant known, were identified on the basis of [3.6]-[4.5] color f…
The WFC3 Galactic Bulge Treasury Program: Relative Ages of Bulge Stars of High and Low Metallicity
Brown, Thomas M.; Gennaro, Mario; Anderson, Jay +6 more
The Hubble Space Telescope/WFC3 multiband photometry spanning from the UV to the near-IR of four fields in the Galactic bulge, together with that for six template globular and open clusters, are used to photometrically tag the metallicity [Fe/H] of stars in these fields after proper-motion rejecting most foreground disk contaminants. Color-magnitu…
Evidence for Merger-driven Growth in Luminous, High-z, Obscured AGNs in the CANDELS/COSMOS Field
Alexander, D. M.; Salvato, M.; Brusa, M. +27 more
While major mergers have long been proposed as a driver of both active galactic nucleus (AGN) activity and the {M}{BH}{--}{σ }{bulge} relation, studies of moderate to high-redshift Seyfert-luminosity AGN hosts have found little evidence for enhanced rates of interactions. However, both theory and observation suggest that whil…