Search Publications
On the coexistence of stellar-mass and intermediate-mass black holes in globular clusters
Lützgendorf, Nora; Heinke, Craig; Maccarone, Thomas J. +3 more
In this paper, we address the question: what is the probability of stellar-mass black hole (BH) binaries co-existing in a globular cluster with an intermediate-mass black hole (IMBH)? Our results suggest that the detection of one or more BH binaries can strongly constrain the presence of an IMBH in most Galactic globular clusters. More specificall…
Intracluster light properties in the CLASH-VLT cluster MACS J1206.2-0847
Zheng, W.; Molino, A.; Moustakas, J. +46 more
Aims: We aim constrain the assembly history of clusters by studying the intracluster light (ICL) properties, estimating its contribution to the fraction of baryons in stars, f∗, and understanding possible systematics or bias using different ICL detection techniques.
Methods: We developed an automated method, GALtoICL, based on…
Phobos' shape and topography models
Shi, X.; Oberst, J.; Willner, K.
The global shape and the dynamic environment are fundamental properties of a body. Other properties such as volume, bulk density, and models for the dynamic environment can subsequently be computed based on such models. Stereo-photogrammetric methods were applied to derive a global digital terrain model (DTM) with 100 m/pixel resolution using High…
Planck 2013 results. X. HFI energetic particle effects: characterization, removal, and simulation
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +213 more
We describe the detection, interpretation, and removal of the signal resulting from interactions of high energy particles with the Planck High Frequency Instrument (HFI). There are two types of interactions: heating of the 0.1 K bolometer plate; and glitches in each detector time stream. The transientresponses to detector glitch shapes are not sim…
First Evidence of Fully Spatially Mixed First and Second Generations in Globular Clusters: The Case of NGC 6362
Dalessandro, Emanuele; Salaris, Maurizio; Mucciarelli, Alessio +6 more
We present the first evidence of multiple populations in the Galactic globular cluster NGC 6362. We used optical and near-UV Hubble Space Telescope and ground-based photometry, finding that both the sub-giant and red giant branches are split in two parallel sequences in all color-magnitude diagrams where the F336W filter (or U band) is used. This …
A Hot Cocoon in the Ultralong GRB 130925A: Hints of a POPIII-like Progenitor in a Low-Density Wind Environment
Fiore, Fabrizio; Piro, Luigi; Wieringa, Mark H. +7 more
GRB 130925A is a peculiar event characterized by an extremely long gamma-ray duration (≈7 ks), as well as dramatic flaring in the X-rays for ≈20 ks. After this period, its X-ray afterglow shows an atypical soft spectrum with photon index Γ ~ 4, as observed by Swift and Chandra, until ≈107 s, when XMM-Newton observations uncover a harder…
Water Vapor in the Spectrum of the Extrasolar Planet HD 189733b. II. The Eclipse
Deming, Drake; Madhusudhan, Nikku; Crouzet, Nicolas +1 more
Spectroscopic observations of exoplanets are crucial to infer the composition and properties of their atmospheres. HD 189733b is one of the most extensively studied exoplanets and is a cornerstone for hot Jupiter models. In this paper, we report the dayside emission spectrum of HD 189733b in the wavelength range 1.1-1.7 µm obtained with the …
Young Galaxy Candidates in the Hubble Frontier Fields. I. A2744
Broadhurst, Tom; Kelson, Daniel D.; Moustakas, John +10 more
We report the discovery of 24 Lyman-break candidates at 7 <~ z <~ 10.5, in the Hubble Frontier Fields (HFF) imaging data of A2744 (z = 0.308), plus Spitzer/IRAC data and archival ACS data. The sample includes a triple image system with a photometric redshift of z ~= 7.4. This high redshift is geometrically confirmed by our lens model corresp…
MOSFIRE Absorption Line Spectroscopy of z > 2 Quiescent Galaxies: Probing a Period of Rapid Size Growth
Ellis, Richard S.; Belli, Sirio; Newman, Andrew B. +1 more
Using the MOSFIRE near-infrared multi-slit spectrograph on the Keck 1 Telescope, we have secured high signal-to-noise ratio absorption line spectra for six massive galaxies with redshift 2 < z < 2.5. Five of these galaxies lie on the red sequence and show signatures of passive stellar populations in their rest-frame optical spectra. By fitti…
Coronal Mass Ejections and Non-recurrent Forbush Decreases
Gopalswamy, N.; Mavromichalaki, H.; Papaioannou, A. +7 more
Coronal mass ejections (CMEs) and their interplanetary counterparts (interplanetary coronal mass ejections, ICMEs) are responsible for large solar energetic particle events and severe geomagnetic storms. They can modulate the intensity of Galactic cosmic rays, resulting in non-recurrent Forbush decreases (FDs). We investigate the connection betwee…