Search Publications
Missions
Journals
Publication Years
Height formation of bright points observed by IRIS in Mg II line wings during flux emergence
Heinzel, P.; Schmieder, B.; Berlicki, A. +3 more
Context. A flux emergence in the active region AR 111850 was observed on September 24, 2013 with the Interface Region Imaging Spectrograph (IRIS). Many bright points are associated with the new emerging flux and show enhancement brightening in the UV spectra.
Aims: The aim of this work is to compute the altitude formation of the compact brigh…
The Phase Space of z∼1.2 SpARCS Clusters: Using Herschel to Probe Dust Temperature as a Function of Environment and Accretion History
Muzzin, A.; van der Burg, R. F. J.; Wilson, G. +5 more
We present a five-band Herschel study (100-500 µm) of three galaxy clusters at z∼ 1.2 from the Spitzer Adaptation of the Red-Sequence Cluster Survey. With a sample of 120 spectroscopically confirmed cluster members, we investigate the role of environment on galaxy properties utilizing the projected cluster phase space (line-of-sight velocity…
Quantifying tensions between CMB and distance data sets in models with free curvature or lensing amplitude
Mohr, J. J.; Saro, A.; Dietrich, J. P. +2 more
Recent measurements of the cosmic microwave background (CMB) by the Planck Collaboration have produced arguably the most powerful observational evidence in support of the standard model of cosmology, I.e. the spatially flat ΛCDM paradigm. In this work, we perform model selection tests to examine whether the base CMB temperature and large scale pol…
Galaxies Probing Galaxies at High Resolution: Co-rotating Gas Associated with a Milky Way Analog at z=0.4
Moustakas, John; Coil, Alison L.; Tremonti, Christy A. +5 more
We present results on gas flows in the halo of a Milky-Way-like galaxy at z = 0.413 based on high-resolution spectroscopy of a background galaxy. This is the first study of circumgalactic gas at high spectral resolution toward an extended background source (I.e., a galaxy rather than a quasar). Using long-slit spectroscopy of the foreground galaxy…
The Hot Companion and Circumbinary Disk of the Be Star HR 2142
Gies, Douglas R.; Wang, Luqian; Peters, Geraldine J. +1 more
We present a spectroscopic investigation of the Be+sdO binary system HR 2142 that is based upon large sets of ultraviolet observations from the International Ultraviolet Explorer (IUE) and ground-based Hα observations. We measured radial velocities for the Be star component from these spectra and computed a revised orbit. In order to search for th…
A New γ-Ray Loud, Eclipsing Low-mass X-Ray Binary
Strader, Jay; Udalski, Andrzej; Chomiuk, Laura +5 more
We report the discovery of an eclipsing low-mass X-ray binary at the center of the 3FGL error ellipse of the unassociated Fermi/Large Area Telescope γ-ray source 3FGL J0427.9-6704. Photometry from OGLE and the SMARTS 1.3 m telescope and spectroscopy from the SOAR telescope have allowed us to classify the system as an eclipsing low-mass X-ray binar…
Relativistic X-ray reverberation modelling of the combined time-averaged and lag-energy spectra in AGN
Chainakun, P.; Young, A. J.; Kara, E.
General relativistic ray tracing simulations of the time-averaged spectrum and energy-dependent time delays in active galactic nuclei (AGN) are presented. We model the lamp-post geometry in which the accreting gas is illuminated by an X-ray source located on the rotation axis of the black hole. The spectroscopic features imprinted in the reflectio…
The Fe II Emission in Active Galactic Nuclei: Excitation Mechanisms and Location of the Emitting Region
Garcia-Rissmann, A.; Sigut, T. A. A.; Rodríguez-Ardila, A. +2 more
We present a study of Fe II emission in the near-infrared region (NIR) for 25 active galactic nuclei (AGNs) to obtain information about the excitation mechanisms that power it and the location where it is formed. We employ an NIR Fe II template derived in the literature and find that it successfully reproduces the observed Fe II spectrum. The Fe I…
Suprathermal Electron Strahl Widths in the Presence of Narrow-band Whistler Waves in the Solar Wind
Fazakerley, A. N.; Maksimovic, M.; Alexandrova, O. +2 more
We perform the first statistical study of the effects of the interaction of suprathermal electrons with narrow-band whistler mode waves in the solar wind (SW). We show that this interaction does occur and that it is associated with enhanced widths of the so-called strahl component. The latter is directed along the interplanetary magnetic field awa…
Gravitational torques imply molecular gas inflow towards the nucleus of M 51
Meidt, S. E.; Schinnerer, E.; Leroy, A. K. +10 more
The transport of gas towards the centre of galaxies is critical for black hole feeding and, indirectly, it can control active galactic nucleus (AGN) feedback. We have quantified the molecular gas inflow in the central R< 1 kpc of M 51 to be 1 M⊙/yr, using a new gravitational torque map and the molecular gas traced by the Plateau de B…