Search Publications
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…
Herschel-PACS observations of shocked gas associated with the jets of L1448 and L1157
Liseau, R.; Codella, C.; van Dishoeck, E. F. +7 more
Aims: In the framework of the Water In Star-forming regions with Herschel (WISH) key program, several H2O (Eu > 190 K), high-J CO, [Oi], and OH transitions are mapped with Herschel-PACS in two shock positions along two prototypical outflows around the low-luminosity sources L1448 and L1157. Previous Herschel-HIFI H
Planck intermediate results. XII: Diffuse Galactic components in the Gould Belt system
Miville-Deschênes, M. -A.; Boulanger, F.; Bernard, J. -P. +179 more
We perform an analysis of the diffuse low-frequency Galactic components in the southern part of the Gould Belt system (130° ≤ l ≤ 230° and -50° ≤ b ≤ -10°). Strong ultra-violet flux coming from the Gould Belt super-association is responsible for bright diffuse foregrounds that we observe from our position inside the system and that can help us imp…
Low-mass X-ray binary populations in galaxy outskirts: Globular clusters and supernova kicks
Bogdán, Á.; Gilfanov, M.; Zhang, Z.
For the first time, we have systematically explored the population of discrete X-ray sources in the outskirts of early-type galaxies. Based on a broad sample of 20 galaxies observed with Chandra we detected overdensity of X-ray sources in their outskirts. The overdensity appears as halos of resolved sources around the galaxies. These halos are bro…
Inner rings in disc galaxies: dead or alive
Comerón, S.
In this Letter, I distinguish "passive" inner rings as those with no current star formation as distinct from "active" inner rings that have undergone recent star formation. I built a sample of nearby galaxies with inner rings observed in the near- and mid-infrared from the NIRS0S and the S4G surveys. I used archival far-ultraviolet (FUV…
Probing AGN triggering mechanisms through the starburstiness of the host galaxies
Fiore, F.; Piconcelli, E.; Santini, P. +3 more
We estimate the fraction of AGNs hosted in starburst galaxies (fbursty) as a function of the AGN luminosity predicted under the assumption that starburst events and AGN activity are triggered by galaxy interactions during their merging histories. The latter are described through Monte Carlo realizations, and are connected to star format…
Deep optical imaging of asymptotic giant branch circumstellar envelopes
Mauron, N.; Huggins, P. J.; Cheung, C. -L.
We report results of a program to image the extended circumstellar envelopes of asymptotic giant branch (AGB) stars in dust-scattered Galactic light. The goal is to characterize the shapes of the envelopes to probe the mass-loss geometry and the presence of hidden binary companions. The observations consist of deep optical imaging of 22 AGB stars …