Search Publications
Iron abundance distribution in the hot gas of merging galaxy clusters
Urdampilleta, I.; Simionescu, A.; Kaastra, J. S. +4 more
We present XMM-Newton/EPIC observations of six merging galaxy clusters and study the distributions of their temperature, iron (Fe) abundance and pseudo-entropy along the merging axis. For the first time, we focused simultaneously, and in a comprehensive way, on the chemical and thermodynamic properties of the newly collided intra cluster medium (I…
Creating HiRISE digital elevation models for Mars using the open-source Ames Stereo Pipeline
Hepburn, Adam J.; Holt, Tom; Hubbard, Bryn +1 more
The present availability of sub-decametre digital elevation models on Mars - crucial for the study of surface processes - is scarce. In contrast to low-resolution global datasets, such models enable the study of landforms <10 km in size, which is the primary scale at which geomorphic processes have been active on Mars over the last 10-20 Myr . …
The abundance of massive compact galaxies at 1.0 < z < 3.0 in 3D-HST/CANDELS
Yuan, Qi-Rong; Lu, Shi-Ying; Gu, Yi-Zhou +1 more
Based on a large sample of massive (M * ⩾ 1010 M ⊙) compact galaxies at 1.0 < z < 3.0 in five 3D-HST/CANDELS fields, we quantify the fractional abundance and comoving number density of massive compact galaxies as a function of redshift. The samples of compact quiescent galaxies (cQGs) and compact star-forming…
X-Ray and Radio Variabilities of PSR J2032+4127 near Periastron
Kerr, M.; Wood, K. S.; Gotthelf, E. V. +6 more
We present X-ray and radio monitoring observations of the gamma-ray binary PSR J2032+4127/MT91 213 during its periastron passage in late 2017. Dedicated Chandra, XMM-Newton, NuSTAR X-ray observations, and Very Large Array radio observations of this long orbit (50 yr), 143 ms pulsar/Be star system clearly revealed flux and spectral variability duri…
WASP-190b: Tomographic Discovery of a Transiting Hot Jupiter
Bouchy, F.; Queloz, D.; Ségransan, D. +22 more
We report the discovery of WASP-190b, an exoplanet on a 5.37 day orbit around a mildly evolved F6 IV-V star with V = 11.7, {T}eff} = 6400 ± 100 K, M * = 1.35 ± 0.05 M ⊙, and R * = 1.6 ± 0.1 R ⊙. The planet has a radius of R P = 1.15 ± 0.09 R Jup and a mass of M P
Phase-resolved gamma-ray spectroscopy of the Crab pulsar observed by POLAR
Wu, Xin; Ge, Ming-Yu; Zhang, Shuang-Nan +14 more
The POLAR detector is a space based Gamma-Ray Burst (GRB) polarimeter sensitive in the 15-500 keV energy range. Apart from its main scientific goal as a Gamma-Ray Burst polarimeter it is also able to detect photons from pulsars in orbit. By using the six-months in-orbit observation data, significant pulsation from the PSR B0531+21 (Crab pulsar) wa…
H I Spectroscopy of Reverberation-mapped Active Galactic Nuclei
Bentz, Misty C.; Courtois, Hélène M.; Johnson, Megan C. +2 more
We present H I 21 cm spectroscopy from the Robert C. Byrd Green Bank Telescope for the host galaxies of 31 nearby active galactic nuclei with direct M BH measurements from reverberation mapping. These are the first published H I detections for 12 galaxies, and the spectral quality is generally an improvement over archival data for the…
A massive nebula around the luminous blue variable star RMC 143 revealed by ALMA
Paladini, R.; Umana, G.; Mehner, A. +11 more
The luminous blue variable (LBV) RMC 143 is located in the outskirts of the 30 Doradus complex, a region rich with interstellar material and hot luminous stars. We report the 3σ sub-millimetre detection of its circumstellar nebula with ALMA. The observed morphology in the sub-millimetre is different than previously observed with HST and ATCA in th…
A supragalactic conundrum: the globular clusters colour pattern in Virgo galaxies
Forte, Juan C.; Vega, E. Irene; Geisler, Douglas +8 more
The presence of systematic modulations in the colour distributions in composite samples of globular clusters (GCs) associated with galaxies in the Virgo and Fornax clusters has been reported in a previous work. In this paper, we focus on the 27 brightest galaxies in Virgo, and in particular on NGC 4486, the dominant system in terms of GC populatio…
Ultraviolet Extinction Properties of the 30 Dor Nebula and Interpreting Observations of Starburst Clusters
Panagia, Nino; De Marchi, Guido
Recent investigations of the extinction law in 30 Dor and the Tarantula Nebula, at optical and near-infrared wavelengths, have revealed a ratio of total to selective extinction R V = A V /E(B - V) of about 4.5. This indicates a larger fraction of big grains than in the Galactic diffuse interstellar medium (ISM). Possible o…