Search Publications
Transient effects in Herschel/PACS spectroscopy
Fadda, Dario; Appleton, Philip N.; Jacobson, Jeffery D.
Context. The Ge:Ga detectors used in the PACS spectrograph onboard the Herschel space telescope react to changes of the incident flux with a certain delay. This generates transient effects on the resulting signal which can be important and last for up to an hour.
Aims: The paper presents a study of the effects of transients on the detected si…
New orbital ephemerides for the dipping source 4U 1323-619: constraining the distance to the source
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
Context. 4U 1323-619 is a low mass X-ray binary system that shows type I X-ray bursts and dips. The most accurate estimation of the orbital period is 2.941923(36) h and a distance from the source that is lower than 11 kpc has been proposed.
Aims: We aim to obtain the orbital ephemeris, the orbital period of the system, as well as its derivati…
The warm absorber in the radio-loud quasar 4C +74.26
Costantini, E.; Di Gesu, L.
Outflows of photoionized gas are commonly detected in the X-ray spectra of Seyfert 1 galaxies. However, the evidence for this phenomenon in broad line radio galaxies, which are analogous to Seyfert 1 galaxies in the radio-loud regime, has so far been scarce. Here, we present the analysis of the X-ray absorption in the radio-loud quasar 4C +74.26. …
Disk galaxy scaling relations at intermediate redshifts. I. The Tully-Fisher and velocity-size relations
Böhm, Asmus; Ziegler, Bodo L.
Aims: Galaxy scaling relations such as the Tully-Fisher relation (between the maximum rotation velocity Vmax and luminosity) and the velocity-size relation (between Vmax and the disk scale length) are powerful tools to quantify the evolution of disk galaxies with cosmic time.
Methods: We took spatially resolved slit…
Suzaku observations of the 2013 outburst of KS 1947+300
Hemphill, Paul B.; Rothschild, Richard E.; Fürst, Felix +9 more
We report on the timing and spectral analysis of two Suzaku observations with different flux levels of the high-mass X-ray binary KS 1947+300 during its 2013 outburst. In agreement with simultaneous NuSTAR observations, the continuum is well described by an absorbed power law with a cutoff and an additional blackbody component. In addition, we fin…
Dayside temperatures in the Venus upper atmosphere from Venus Express/VIRTIS nadir measurements at 4.3 µm
López-Valverde, M. A.; Gilli, G.; Peralta, J. +1 more
In this work, we analysed nadir observations of atmospheric infrared emissions carried out by VIRTIS, a high-resolution spectrometer on board the European spacecraft Venus Express. We focused on the ro-vibrational band of CO2 at 4.3 µm on the dayside, whose fluorescence originates in the Venus upper mesosphere and above. This is t…
Near-infrared photometry of WISE J085510.74-071442.5
Minniti, D.; Bayo, A.; Béjar, V. J. S. +7 more
Aims: We aim at obtaining near-infrared photometry and deriving the mass, age, temperature, and surface gravity of WISE J085510.74-071442.5 (J0855-0714), which is the coolest object beyond the solar system currently known.
Methods: We used publicly available data from the archives of the Hubble Space Telescope (HST) and the Very Large Te…
Multiwavelength study of the fast rotating supergiant high-mass X-ray binary IGR J16465-4507
Goldoni, P.; Chaty, S.; Simón-Díaz, S. +6 more
Context. Since its launch, the X-ray and γ-ray observatory INTEGRAL satellite has revealed a new class of high-mass X-ray binaries (HMXB) displaying fast flares and hosting supergiant companion stars. Optical and infrared (OIR) observations in a multi-wavelength context are essential to understand the nature and evolution of these newly discovered…
Joint signal extraction from galaxy clusters in X-ray and SZ surveys: A matched-filter approach
Arnaud, M.; Pratt, G. W.; Melin, J. -B. +1 more
The hot ionized gas of the intra-cluster medium emits thermal radiation in the X-ray band and also distorts the cosmic microwave radiation through the Sunyaev-Zel'dovich (SZ) effect. Combining these two complementary sources of information through innovative techniques can therefore potentially improve the cluster detection rate when compared to u…
Chromospheric evaporation flows and density changes deduced from Hinode/EIS during an M1.6 flare
Temmer, M.; Veronig, A. M.; Gömöry, P. +2 more
Aims: We study the response of the solar atmosphere during a GOES M1.6 flare using spectroscopic and imaging observations. In particular, we examine the evolution of the mass flows and electron density together with the energy input derived from hard X-ray (HXR) in the context of chromospheric evaporation.
Methods: We analyzed high-caden…