Search Publications
On the Stellar Masses of Giant Clumps in Distant Star-forming Galaxies
Schaerer, Daniel; Cava, Antonio; Mayer, Lucio +2 more
We analyze stellar masses of clumps drawn from a compilation of star-forming galaxies at 1.1 < z < 3.6. Comparing clumps selected in different ways, and in lensed or blank field galaxies, we examine the effects of spatial resolution and sensitivity on the inferred stellar masses. Large differences are found, with median stellar masses rangin…
The Grism Lens-Amplified Survey from Space (GLASS). XI. Detection of C IV in Multiple Images of the z = 6.11 Lyα Emitter behind RXC J2248.7-4431
Vulcani, B.; Hoag, A.; Bradač, M. +11 more
The C III] and C IV rest-frame UV emission lines are powerful probes of the ionization states of galaxies. They have furthermore been suggested as alternatives for spectroscopic redshift confirmation of objects at the epoch of reionization (z> 6), where the most frequently used redshift indicator, Lyα, is attenuated by the high fraction of neut…
Stellar Photometric Structures of the Host Galaxies of Nearby Type 1 Active Galactic Nuclei
Ho, Luis C.; Barth, Aaron J.; Im, Myungshin +2 more
We present detailed image analysis of rest-frame optical images of 235 low-redshift (z ≲ 0.35) Type 1 active galactic nuclei (AGNs) observed with the Hubble Space Telescope. The high-resolution images enable us to perform rigorous two-dimensional image modeling to decouple the luminous central point source from the host galaxy, which, when warrant…
A population of faint low surface brightness galaxies in the Perseus cluster core
Wittmann, Carolin; Kotulla, Ralf; Lisker, Thorsten +7 more
We present the detection of 89 low surface brightness (LSB), and thus low stellar density galaxy candidates in the Perseus cluster core, of the kind named 'ultra-diffuse galaxies', with mean effective V-band surface brightnesses 24.8-27.1 mag arcsec-2, total V-band magnitudes -11.8 to -15.5 mag, and half-light radii 0.7-4.1 kpc. The can…
The Gaia ultracool dwarf sample - I. Known L and T dwarfs and the first Gaia data release
Caballero, J. A.; Sarro, L. M.; Marocco, F. +5 more
We identify and investigate known ultracool stars and brown dwarfs that are being observed or indirectly constrained by the Gaia mission. These objects will be the core of the Gaia ultracool dwarf sample composed of all dwarfs later than M7 that Gaia will provide direct or indirect information on. We match known L and T dwarfs to the Gaia first da…
Eclipsing binary stars with a δ Scuti component
Smalley, B.; Kahraman Aliçavuş, F.; Kubát, J. +1 more
Eclipsing binaries with a δ Sct component are powerful tools to derive the fundamental parameters and probe the internal structure of stars. In this study, spectral analysis of six primary δ Sct components in eclipsing binaries has been performed. Values of Teff, v sin I, and metallicity for the stars have been derived from medium-resol…
The compactness of the isolated neutron star RX J0720.4-3125
Werner, K.; Haberl, F.; Neuhäuser, R. +4 more
Aims: To estimate the compactness of the thermally-emitting isolated neutron star (INS) RX J0720.4-3125, an X-ray spin-phase-resolved spectroscopic study is conducted. In addition, to identify the genuine spin-period, an X-ray timing analysis is performed.
Methods: The data from all observations of RX J0720.4-3125 conducted by XMM-Newton…
Cosmic rays, gas and dust in nearby anticentre clouds. I. CO-to-H2 conversion factors and dust opacities
Marshall, D. J.; Casandjian, J. M.; Grenier, I. A. +1 more
Aims: We aim to explore the capabilities of dust emission and γ rays for probing the properties of the interstellar medium in the nearby anti-centre region, using γ-ray observations with the Fermi Large Area Telescope (LAT), and the thermal dust optical depth inferred from Planck and IRAS observations. We also aim to study massive star-formin…
Probing the solar transition region: current status and future perspectives
Tian, Hui
The solar transition region (TR) is the temperature regime from roughly 0.02 MK to 0.8 MK in the solar atmosphere. It is the transition layer from the collisional and partially ionized chromosphere to the collisionless and fully ionized corona. The TR plays an important role in the mass and energy transport in both the quiet solar atmosphere and s…
The most distant, luminous, dusty star-forming galaxies: redshifts from NOEMA and ALMA spectral scans
Pérez-Fournon, I.; Ivison, R. J.; Omont, A. +23 more
We present 1.3- and/or 3-mm continuum images and 3-mm spectral scans, obtained using Northern Extended Millimeter Array (NOEMA) and Atacama Large Millimeter Array (ALMA), of 21 distant, dusty, star-forming galaxies. Our sample is a subset of the galaxies selected by Ivison et al. on the basis of their extremely red far-infrared (far-IR) colours an…