Search Publications
Morphology with light profile fitting of confirmed cluster galaxies at z = 0.84
Demarco, R.; Lidman, C.; Rosati, P. +3 more
We perform a morphological study of 124 spectroscopically confirmed cluster galaxies in the redshift (z) = 0.84 galaxy cluster RX J0152.7-1357. Our classification scheme includes color information, visual morphology, and one- and two-component light profile fitting derived from Hubble Space Telescope riz imaging. We adopt a modified version of a d…
Anchors for the cosmic distance scale: the Cepheids U Sagittarii, CF Cassiopeiae, and CEab Cassiopeiae
Kovtyukh, V.; Bonatto, C.; Moni Bidin, C. +11 more
New and existing X-ray, UBVJHKsW(1 - 4), and spectroscopic observations were analyzed to constrain fundamental parameters for M 25, NGC 7790, and dust along their sight-lines. The star clusters are of particular importance because they host the classical Cepheids U Sgr, CF Cas, and the visual binary Cepheids CEa and CEb Cas. …
Herschel survey of brown dwarf disks in ρ Ophiuchi
Pinte, C.; Könyves, V.; Ábrahám, P. +6 more
Context. Young brown dwarfs are known to possess circumstellar disks, a characteristic that is fundamental to the understanding of their formation process, and raises the possibility that these objects harbour planets.
Aims: We want to characterise the far-IR emission of disks around the young brown dwarf population of the ρ Ophiuchi cluster …
APEX/SABOCA observations of small-scale structure of infrared-dark clouds . I. Early evolutionary stages of star-forming cores
Henning, Thomas; Beuther, Henrik; Ragan, Sarah E.
Infrared-dark clouds (IRDCs) harbor the early phases of cluster and high-mass star formation and are comprised of cold (~20 K), dense (n > 104 cm-3) gas. The spectral energy distribution (SED) of IRDCs is dominated by the far-infrared and millimeter wavelength regime, and our initial Herschel study examined IRDCs at the pe…
Determination of the far-infrared dust opacity in a prestellar core
Juvela, M.; White, G. J.; André, Ph. +5 more
Context. Mass estimates of interstellar clouds from far-infrared and submillimetre mappings depend on the assumed dust absorption cross-section for radiation at those wavelengths.
Aims: The aim is to determine the far-IR dust absorption cross-section in a starless, dense core located in Corona Australis. The value is needed for determining of…
Active asteroid belt causes the UXOR phenomenon in RZ Piscium
Grinin, V. P.; Müller, A.; de Wit, W. J. +3 more
We report the discovery of mid-infrared excess emission in the young object RZ Psc. The excess constitutes ~8% of its Lbol and is well fit by a single 500 K blackbody, implying a dust-free region within ~0.7 AU for optically thick dust. The object displays dust obscuration events (UXOR behaviour) on a time scale that suggests dusty mate…
Radial profile of the inner heliospheric magnetic field as deduced from Faraday rotation observations
Mancuso, S.; Garzelli, M. V.
Faraday rotation measures (RMs) of the polarized emission from extragalactic radio sources occulted by the coronal plasma were used to infer the radial profile of the inner heliospheric magnetic field near the solar minimum. By inverting LASCO/SOHO polarized brightness (pB) data taken during the observations in May 1997, we retrieved the electron …
α Centauri A in the far infrared. First measurement of the temperature minimum of a star other than the Sun
Olofsson, G.; Krivov, A. V.; Eiroa, C. +15 more
Context. Chromospheres and coronae are common phenomena on solar-type stars. Understanding the energy transfer to these heated atmospheric layers requires direct access to the relevant empirical data. Study of these structures has, by and large, been limited to the Sun thus far.
Aims: The region of the temperature reversal can be directly obs…
Spectral energy distributions of H ii regions in M 33 (HerM33es)
Boquien, M.; Braine, J.; Calzetti, D. +16 more
Aims: Within the framework of the Herschel M 33 extended survey HerM33es and in combination with multi-wavelength data we study the spectral energy distribution (SED) of a set of H ii regions in the Local Group galaxy M 33 as a function of the morphology. We analyse the emission distribution in regions with different morphologies and present …
Swift J053041.9-665426, a new Be/X-ray binary pulsar in the Large Magellanic Cloud
Pietsch, W.; Haberl, F.; Sturm, R. +4 more
Aims: We observed the newly discovered X-ray source Swift J053041.9-665426in the X-ray and optical regime to confirm its proposed nature as a high mass X-ray binary.
Methods: We obtained XMM-Newton and Swift X-ray data, along with optical observations with the ESO Faint Object Spectrograph, to investigate the spectral and temporal charac…