Search Publications
Sixteen Years of Ulysses Interstellar Dust Measurements in the Solar System. III. Simulations and Data Unveil New Insights into Local Interstellar Dust
Krüger, Harald; Sterken, Veerle J.; von Steiger, Rudolf +2 more
Interstellar dust (ISD) in the solar system was detected in situ for the first time in 1993 by the Ulysses dust detector. The study of ISD is important for understanding its role in star and solar system formation. The goal of this paper is to understand the variability in the ISD observations from the Ulysses mission by using a Monte Carlo simula…
The inferred evolution of the cold gas properties of CANDELS galaxies at 0.5 < z < 3.0
Ferguson, H. C.; Koekemoer, A. M.; Faber, S. M. +13 more
We derive the total cold gas, atomic hydrogen, and molecular gas masses of approximately 24 000 galaxies covering four decades in stellar mass at redshifts 0.5 < z < 3.0, taken from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey survey. Our inferences are based on the inversion of a molecular hydrogen based star formation…
Distance priors from Planck 2015 data
Huang, Qing-Guo; Wang, Ke; Wang, Sai
We update the distance priors by adopting Planck TT,TE,EE+lowP data released in 2015, and our results impose at least 30% tighter constraints than those from Planck TT+lowP. Combining the distance priors with the combination of supernova Union 2.1 compilation of 580 SNe (Union 2.1) and low redshift Baryon Acoustic Oscillation (BAO) data, we constr…
Old supernova dust factory revealed at the Galactic center
Morris, M. R.; Lau, R. M.; Herter, T. L. +2 more
Dust formation in supernova ejecta is currently the leading candidate to explain the large quantities of dust observed in the distant, early universe. However, it is unclear whether the ejecta-formed dust can survive the hot interior of the supernova remnant (SNR). We present infrared observations of ~0.02 solar masses of warm (~100 kelvin) dust s…
Are Models for Core-collapse Supernova Progenitors Consistent with the Properties of Supernova Remnants?
Badenes, Carles; Lee, Shiu-Hang; Ellison, Donald C. +4 more
The recent discovery that the Fe-K line luminosities and energy centroids observed in nearby supernova remnants are a strong discriminant of both progenitor type and circumstellar environment has implications for our understanding of supernova progenitor evolution. Using models for the chemical composition of core-collapse supernova (CCSN) ejecta,…
Quiescent Compact Galaxies at Intermediate Redshift in the COSMOS Field. The Number Density
Hwang, Ho Seong; Geller, Margaret J.; Damjanov, Ivana +1 more
We investigate the evolution of compact galaxy number density over the redshift range 0.2\lt z\lt 0.8. Our sample consists of galaxies with secure spectroscopic redshifts observed in the COSMOS field. With the large uncertainties, the compact galaxy number density trend with redshift is consistent with a constant value over the interval 0.2\lt z\l…
Ultra-deep catalog of X-ray groups in the Extended Chandra Deep Field South
Finoguenov, A.; Popesso, P.; Heymans, C. +22 more
Aims: We present the detection, identification and calibration of extended sources in the deepest X-ray dataset to date, the Extended Chandra Deep Field South (ECDF-S).
Methods: Ultra-deep observations of ECDF-S with Chandra and XMM-Newton enable a search for extended X-ray emission down to an unprecedented flux of 2 × 10-16 e…
Saturn's G and D Rings Provide Nearly Complete Measured Scattering Phase Functions of Nearby Debris Disks
Hedman, Matthew M.; Stark, Christopher C.
The appearance of debris disks around distant stars depends upon the scattering/phase function (SPF) of the material in the disk. However, characterizing the SPFs of these extrasolar debris disks is challenging because only a limited range of scattering angles are visible to Earth-based observers. By contrast, Saturn’s tenuous rings can be observe…
Panchromatic Hubble Andromeda Treasury. XII. Mapping Stellar Metallicity Distributions in M31
Monachesi, Antonela; Dolphin, Andrew E.; Skillman, Evan D. +14 more
We present a study of spatial variations in the metallicity of old red giant branch stars in the Andromeda galaxy. Photometric metallicity estimates are derived by interpolating isochrones for over seven million stars in the Panchromatic Hubble Andromeda Treasury (PHAT) survey. This is the first systematic study of stellar metallicities over the i…
Interstellar Dust Properties from a Survey of X-Ray Halos
Smith, Randall K.; Valencic, Lynne A.
Interstellar dust grains produce X-ray halos around bright sources due to small-angle X-ray scattering. Numerous studies have examined these halos, but no systematic study has yet tested the available halo data against the large number of well-defined dust models in circulation. We have therefore obtained the largest sample to date of X-ray dust h…