Search Publications
Starburst-AGN mixing - I. NGC 7130
Kewley, Lisa J.; Davies, Rebecca L.; Dopita, Michael A. +1 more
We present an integral field spectroscopic study of the luminous infrared galaxy NGC 7130, a known starburst-active galactic nucleus (AGN) composite galaxy. We employ standard emission-line ratio diagnostics and maps of velocity dispersion and velocity field to investigate how the dominant ionizing sources change as a function of radius. From the …
MAGIC long-term study of the distant TeV blazar PKS 1424+240 in a multiwavelength context
Maraschi, L.; Covino, S.; Antonelli, L. A. +170 more
Aims: We present a study of the very high-energy (VHE; E> 100 GeV) γ-ray emission of the blazar PKS 1424+240 observed with the MAGIC telescopes. The primary aim of this paper is the multiwavelength spectral characterization and modeling of this blazar, which is made particularly interesting by the recent discovery of a lower limit of its r…
Constraining globular cluster formation through studies of young massive clusters - IV. Testing the fast rotating massive star scenario
Cabrera-Ziri, I.; Bastian, N.; Hollyhead, K.
One of the leading models for the formation of multiple stellar populations within globular clusters is the `fast rotating massive star' (FRMS) scenario, where the ejecta of rapidly rotating massive stars is mixed with primordial material left over from the star formation process, to form a second generation of stars within the decretion discs of …
Wide longitudinal distribution of interplanetary electrons following the 7 February 2010 solar event: Observations and transport modeling
Dresing, N.; Heber, B.; Dröge, W. +2 more
We analyze 65-105 keV electrons in the 7 February 2010 solar electron event observed simultaneously by STEREO-A, STEREO-B, and ACE. A method to reconstruct the full-electron pitch angle distributions from the four Solar Electron and Proton Telescope sensors on STEREO-A/B and the Solar Electron and Proton Telescope instrument on ACE in the energy r…
Recoiling Supermassive Black Holes: A Search in the Nearby Universe
Marconi, A.; Capetti, A.; Batcheldor, D. +4 more
The coalescence of a binary black hole can be accompanied by a large gravitational recoil due to anisotropic emission of gravitational waves. A recoiling supermassive black hole (SBH) can subsequently undergo long-lived oscillations in the potential well of its host galaxy, suggesting that offset SBHs may be common in the cores of massive elliptic…
Inefficient star formation in extremely metal poor galaxies
Wang, Junzhi; Gao, Yu; Zhang, Zhi-Yu +5 more
The first galaxies contain stars born out of gas with few or no `metals' (that is, elements heavier than helium). The lack of metals is expected to inhibit efficient gas cooling and star formation, but this effect has yet to be observed in galaxies with an oxygen abundance (relative to hydrogen) below a tenth of that of the Sun. Extremely metal po…
H I, CO, and Planck/IRAS Dust Properties in the High Latitude Cloud Complex, MBM 53, 54, 55 and HLCG 92 - 35. Possible Evidence for an Optically Thick H I Envelope around the CO Clouds
Tachihara, Kengo; Fukui, Yasuo; Dickey, John M. +9 more
We present an analysis of the H I and CO gas in conjunction with the Planck/IRAS submillimeter/far-infrared dust properties toward the most outstanding high latitude clouds MBM 53, 54, 55 and HLCG 92 - 35 at b = -30° to - 45°. The CO emission, dust opacity at 353 GHz (τ353), and dust temperature (T d) show generally good spat…
Mineral abundances at the final four curiosity study sites and implications for their formation
Poulet, F.; Bishop, J. L.; Carter, J. +2 more
A component of the landing site selection process for the Mars Science Laboratory (MSL) involved the presence of phyllosilicates as the main astrobiological targets. Gale crater was selected as the MSL landing site from among 4 down selected study sites (Gale, Eberswalde and Holden craters, Mawrth Vallis) that addressed the primary scientific goal…
Energetic electron bursts in the plasma sheet and their relation with BBFs
Cao, J. B.; Dunlop, M.; Wang, Z. Q. +1 more
We studied energetic electron bursts (EEBs) (40-250 keV) in the plasma sheet (PS) and their relation to bursty bulk flows (BBFs) using the data recorded by Cluster from 2001 to 2009. The EEBs in the PS can be classified into four types. Three types of EEBs are dispersionless, including EEBs accompanied with BBFs (V > 250 km/s) but without dipol…
The Panchromatic Hubble Andromeda Treasury. V. Ages and Masses of the Year 1 Stellar Clusters
Bell, Eric F.; Gouliermis, Dimitrios A.; Skillman, Evan D. +12 more
We present ages and masses for 601 star clusters in M31 from the analysis of the six filter integrated light measurements from near-ultraviolet to near-infrared wavelengths, made as part of the Panchromatic Hubble Andromeda Treasury (PHAT). We derive the ages and masses using a probabilistic technique, which accounts for the effects of stochastic …