Search Publications
Galaxy populations in massive galaxy clusters to z = 1.1: colour distribution, concentration, halo occupation number and red sequence fraction
Benoit-Lévy, A.; D'Andrea, C. B.; Zenteno, A. +70 more
We study the galaxy populations in 74 Sunyaev-Zeldovich effect selected clusters from the South Pole Telescope survey, which have been imaged in the science verification phase of the Dark Energy Survey. The sample extends up to z ∼ 1.1 with 4 × 1014 M⊙ ≤ M200 ≤ 3 × 1015M⊙. Using the band conta…
The WISSH quasars project. II. Giant star nurseries in hyper-luminous quasars
Fiore, F.; Bianchi, S.; Martocchia, S. +12 more
Context. Studying the coupling between the energy output produced by the central quasar and the host galaxy is fundamental to fully understand galaxy evolution. Quasar feedback is indeed supposed to dramatically affect the galaxy properties by depositing large amounts of energy and momentum into the interstellar medium (ISM).
Aims: In order t…
XMMSL1 J074008.2-853927: a tidal disruption event with thermal and non-thermal components
Wieringa, M. H.; Read, A. M.; Komossa, S. +3 more
Aims: We study X-ray bright tidal disruption events (TDE), close to the peak of their emission, with the intention of understanding the evolution of their light curves and spectra.
Methods: Candidate TDE are identified by searching for soft X-ray flares from non-active galaxies in recent XMM-Newton slew data.
Results: In April 2014,…
A new, faint population of X-ray transients
Yang, Guang; Brandt, William N.; Schneider, Donald P. +22 more
We report on the detection of a remarkable new fast high-energy transient found in the Chandra Deep Field-South, robustly associated with a faint (mR = 27.5 mag, zph ∼ 2.2) host in the CANDELS survey. The X-ray event is comprised of 115^{+12}_{-11} net 0.3-7.0 keV counts, with a light curve characterized by an ≈100 s rise tim…
A STEREO Survey of Magnetic Cloud Coronal Mass Ejections Observed at Earth in 2008-2012
Howard, Russell A.; Linton, Mark G.; Wood, Brian E. +4 more
We identify coronal mass ejections (CMEs) associated with magnetic clouds (MCs) observed near Earth by the Wind spacecraft from 2008 to mid-2012, a time period when the two STEREO spacecraft were well positioned to study Earth-directed CMEs. We find 31 out of 48 Wind MCs during this period can be clearly connected with a CME that is trackable in S…
Pulsar-Wind Nebulae and Magnetar Outflows: Observations at Radio, X-Ray, and Gamma-Ray Wavelengths
Mereghetti, Sandro; Reynolds, Stephen P.; Pavlov, George G. +3 more
We review observations of several classes of neutron-star-powered outflows: pulsar-wind nebulae (PWNe) inside shell supernova remnants (SNRs), PWNe interacting directly with interstellar medium (ISM), and magnetar-powered outflows. We describe radio, X-ray, and gamma-ray observations of PWNe, focusing first on integrated spectral-energy distributi…
Direct evidence of multiple reservoirs of volatile nitrogen in a protosolar nebula analogue
Forveille, T.; Hily-Blant, P.; Faure, A. +3 more
Isotopic ratios are keys to understanding the origin and early evolution of the solar system in the context of Galactic nucleosynthesis. The large range of measured 14N/15N isotopic ratios in the solar system reflects distinct reservoirs of nitrogen whose origins remain to be determined. We have directly measured a C14
Standard Galactic Field RR Lyrae. I. Optical to Mid-infrared Phased Photometry
Kollmeier, Juna A.; Madore, Barry F.; Freedman, Wendy L. +6 more
We present a multi-wavelength compilation of new and previously published photometry for 55 Galactic field RR Lyrae variables. Individual studies, spanning a time baseline of up to 30 years, are self-consistently phased to produce light curves in 10 photometric bands covering the wavelength range from 0.4 to 4.5 microns. Data smoothing via the GLO…
An Ultraviolet Excess in the Superluminous Supernova Gaia16apd Reveals a Powerful Central Engine
Berger, E.; Challis, P.; Chornock, R. +5 more
Since the discovery of superluminous supernovae (SLSNe) in the last decade, it has been known that these events exhibit bluer spectral energy distributions than other supernova subtypes, with significant output in the ultraviolet. However, the event Gaia16apd seems to outshine even the other SLSNe at rest-frame wavelengths below ∼3000 Å. Yan et al…
A Comprehensive Study of Lyα Emission in the High-redshift Galaxy Population
Blanc, Guillermo A.; Oyarzún, Grecco A.; Mateo, Mario +2 more
We present an exhaustive census of Lyman alpha (Lyα) emission in the general galaxy population at 3< z< 4.6. We use the Michigan/Magellan Fiber System (M2FS) spectrograph to study a stellar mass (M {}* ) selected sample of 625 galaxies homogeneously distributed in the range 7.6< {log} {M}* /{M}⊙ < 10.6.…