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GRO J1744-28: an intermediate B-field pulsar in a low-mass X-ray binary
Sanna, A.; Robba, N. R.; Dauser, T. +10 more
The bursting pulsar, GRO J1744-28, went again in outburst after ∼18 yr of quiescence in 2014 mid-January. We studied the broad-band, persistent, X-ray spectrum using X-ray data from a XMM-Newton observation, performed almost at the peak of the outburst, and from a close INTEGRAL observation, performed 3 d later, thus covering the 1.3-70.0 keV band…
Constraining the Redshift Evolution of the Cosmic Microwave Background Blackbody Temperature with PLANCK Data.
Martins, C. J. A. P.; Kocevski, D.; Atrio-Barandela, F. +4 more
We constrain the deviation of adiabatic evolution of the universe using the data on the cosmic microwave background (CMB) temperature anisotropies measured by the Planck satellite and a sample of 481 X-ray selected clusters with spectroscopically measured redshifts. To avoid antenna beam effects, we bring all of the maps to the same resolution. We…
New Fe I Level Energies and Line Identifications from Stellar Spectra
Peterson, Ruth C.; Kurucz, Robert L.
The spectrum of the Fe I atom is critical to many areas of astrophysics and beyond. Measurements of the energies of its high-lying levels remain woefully incomplete, however, despite extensive laboratory and solar analysis. In this work, we use high-resolution archival absorption-line ultraviolet and optical spectra of stars whose warm temperature…
Kinematics of interacting CMEs of 25 and 28 September 2012
Srivastava, Nandita; Mishra, Wageesh; Singh, Talwinder
We have studied two coronal mass ejections (CMEs) that occurred on 25 and 28 September 2012 and interacted near the Earth. By fitting the Graduated Cylindrical Shell model on the SECCHI/COR2 images and applying the Stereoscopic Self-Similar Expansion method on the SECCHI/HI images, the initial direction of both the CMEs is estimated to be west of …
Investigating powerful jets in radio-loud narrow-line Seyfert 1s
Larsson, J.; Giroletti, M.; Dallacasa, D. +5 more
We report results on multiband observations from radio to γ-rays of the two radio-loud narrow-line Seyfert 1 (NLSy1) galaxies PKS 2004-447 and J1548+3511. Both sources show a core-jet structure on parsec scale, while they are unresolved at the arcsecond scale. The high core dominance and the high variability brightness temperature make these NLSy1…
The SCITEAS experiment: Optical characterizations of sublimating icy planetary analogues
Thomas, N.; El-Maarry, M. R.; Pommerol, A. +3 more
We have designed and built a laboratory facility to investigate the spectro-photometric and morphologic properties of different types of ice-bearing planetary surface analogs and follow their evolution upon exposure to a low pressure and low temperature environment. The results obtained with this experiment are used to verify and improve our inter…
Venus mesospheric sulfur dioxide measurement retrieved from SOIR on board Venus Express
Vandaele, A. C.; Robert, S.; Wilquet, V. +5 more
SOIR on board Venus Express sounds the Venus upper atmosphere using the solar occultation technique. It detects the signature from many Venus atmosphere species, including those of SO2 and CO2. SO2 has a weak absorption structure at 4 µm, from which number density profiles are regularly inferred. SO2
Study of the reflection spectrum of the accreting neutron star GX 3+1 using XMM-Newton and INTEGRAL
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
Broad emission features of abundant chemical elements, such as iron, are commonly seen in the X-ray spectra of accreting compact objects and their studies can provide useful information about the geometry of the accretion processes. In this work, we focus our attention on GX 3+1, a bright, persistent accreting low-mass X-ray binary, classified as …
The Herschel Exploitation of Local Galaxy Andromeda (HELGA). VI. The Distribution and Properties of Molecular Cloud Associations in M31
Fritz, J.; Cooray, A.; Lebouteiller, V. +18 more
In this paper we present a catalog of giant molecular clouds (GMCs) in the Andromeda (M31) galaxy extracted from the Herschel Exploitation of Local Galaxy Andromeda (HELGA) data set. GMCs are identified from the Herschel maps using a hierarchical source extraction algorithm. We present the results of this new catalog and characterize the spatial d…
What powers the 3000-day light curve of SN 2006gy?
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Cenko, S. Bradley +11 more
SN 2006gy was the most luminous supernova (SN) ever observed at the time of its discovery and the first of the newly defined class of superluminous supernovae (SLSNe). The extraordinary energetics of SN 2006gy and all SLSNe (>1051 erg) require either atypically large explosion energies (e.g. pair-instability explosion) or the efficie…