Search Publications
Solar-stellar astrophysics and dark matter
Turck-Chièze, Sylvaine; Lopes, Ilídio
In this review, we recall how stars contribute to the search for dark matter and the specific role of the Sun. We describe a more complete picture of the solar interior that emerges from neutrino detections, gravity and acoustic mode measurements of the Solar and Heliospheric Observatory (SOHO) satellite, becoming a reference for the most common s…
Star-Galaxy Classification in Multi-band Optical Imaging
Hogg, David W.; Fadely, Ross; Willman, Beth
Ground-based optical surveys such as PanSTARRS, DES, and LSST will produce large catalogs to limiting magnitudes of r >~ 24. Star-galaxy separation poses a major challenge to such surveys because galaxies—even very compact galaxies—outnumber halo stars at these depths. We investigate photometric classification techniques on stars and galaxies w…
The X-ray lightcurve of Sagittarius A* over the past 150 years inferred from Fe-Kα line reverberation in Galactic centre molecular clouds
Capelli, R.; Warwick, R. S.; Porquet, D. +2 more
Context. The spatial distribution and variability of Fe-Kα emission from molecular clouds in the Galactic centre region may provide an important key to the understanding of the recent history of Sgr A*. A very plausible interpretation is that this variability represents an echo in the reflected radiation from the clouds of a past episode of high a…
Quantifying the faint structure of galaxies: the late-type spiral NGC 2403
Jablonka, P.; Ferguson, Annette M. N.; Irwin, M. J. +2 more
Ground-based surveys have mapped the stellar outskirts of Local Group disc galaxies in unprecedented detail, but extending this work to other galaxies is necessary in order to overcome stochastic variations in evolutionary history and provide more stringent constraints on cosmological galaxy formation models. As part of our continuing programme of…
Profiling filaments: comparing near-infrared extinction and submillimetre data in TMC-1
Juvela, M.; André, Ph.; Palmeirim, P. +3 more
Context. Interstellar filaments are an important part of the star formation process. In order to understand the structure and formation of filaments, the filament cross-section profiles are often fitted with the so-called Plummer profile function. Currently this profiling is often approached with submillimetre studies, especially with Herschel. If…
The Advanced Camera for Surveys General Catalog: Structural Parameters for Approximately Half a Million Galaxies
Koekemoer, Anton M.; Conselice, Christopher J.; Weiner, Benjamin +18 more
We present the Advanced Camera for Surveys General Catalog (ACS-GC), a photometric and morphological database using publicly available data obtained with the Advanced Camera for Surveys (ACS) instrument on the Hubble Space Telescope. The goal of the ACS-GC database is to provide a large statistical sample of galaxies with reliable structural and d…
Super fast plasma streams as drivers of transient and anomalous magnetospheric dynamics
Daly, P. W.; Kozak, L.; Amata, E. +12 more
We present multi spacecraft measurements in the magnetosheath (MSH) and in the solar wind (SW) by Interball, Cluster and Polar, demonstrating that coherent structures with magnetosonic Mach number up to 3 - Supermagnetosonic Plasma Streams (SPS) - generate transient and anomalous boundary dynamics, which may cause substantial displacements of the …
Planck intermediate results. I. Further validation of new Planck clusters with XMM-Newton
Böhringer, H.; Kneissl, R.; Dahle, H. +182 more
We present further results from the ongoing XMM-Newton validation follow-up of Planck cluster candidates, detailing X-ray observations of eleven candidates detected at a signal-to-noise ratio of 4.5 < S/N < 5.3 in the same 10-month survey maps used in the construction of the Early SZ sample. The sample was selected in order to test internal …
A Population of z > 2 Far-infrared Herschel-SPIRE-selected Starbursts
Berta, S.; Magnelli, B.; Lutz, D. +29 more
We present spectroscopic observations for a sample of 36 Herschel-SPIRE 250-500 µm selected galaxies (HSGs) at 2 < z < 5 from the Herschel Multi-tiered Extragalactic Survey. Redshifts are confirmed as part of a large redshift survey of Herschel-SPIRE-selected sources covering ~0.93 deg2 in six extragalactic legacy fields. Ob…
The similarity of broad iron lines in X-ray binaries and active galactic nuclei
Fabian, A. C.; Miller, J. M.; Reis, R. C. +2 more
We have compared the 2001 XMM-Newton spectra of the stellar mass black hole binary XTE J1650-500 and the active galaxy MCG-6-30-15, focusing on the broad, excess emission features at ∼4-7 keV displayed by both sources. Such features are frequently observed in both low-mass X-ray binaries and active galactic nuclei (AGN). For the former case it is …