Search Publications
H2S in the L1157-B1 bow shock
Viti, Serena; Bachiller, Rafael; Ceccarelli, Cecilia +8 more
Sulphur-bearing molecules are highly reactive in the gas phase of the interstellar medium. However, the form in which most of the sulphur is locked on to interstellar dust grains is unknown. By taking advantage of the short time-scales of shocks in young molecular outflows, one could track back the main form of sulphur in the ices. In this paper, …
Abundance stratification in Type Ia supernovae - V. SN 1986G bridging the gap between normal and subluminous SNe Ia
Pian, E.; Ashall, C.; Mazzali, P. A. +1 more
A detailed spectroscopic analysis of SN 1986G has been performed. SN 1986G `bridges the gap' between normal and subluminous Type Ia supernovae (SNe Ia). The abundance tomography technique is used to determine the abundance distribution of the elements in the ejecta. SN 1986G was found to be a low-energy Chandrasekhar mass explosion. Its kinetic en…
Explaining the reportedly overmassive black holes in early-type galaxies with intermediate-scale discs
Graham, Alister W.; Savorgnan, Giulia A. D.
The classification `early-type' galaxy includes both elliptically and lenticular-shaped galaxies. Theoretically, the spheroid-to-disc flux ratio of an early-type galaxy can assume any positive value, but in practice studies often consider only spheroid/disc decompositions in which the disc neatly dominates over the spheroid at large galaxy radii, …
The formation of bulges, discs and two-component galaxies in the CANDELS Survey at z < 3
Conselice, Christopher J.; Mortlock, Alice; Dekel, Avishai +5 more
We examine a sample of 1495 galaxies in the CANDELS fields to determine the evolution of two-component galaxies, including bulges and discs, within massive galaxies at the epoch 1 < z < 3 when the Hubble sequence forms. We fit all of our galaxies' light profiles with a single Sérsic fit, as well as with a combination of exponential and Sérsi…
The HerMES submillimetre local and low-redshift luminosity functions
Aussel, H.; Pérez-Fournon, I.; Valtchanov, I. +43 more
We used wide-area surveys over 39 deg2 by the HerMES (Herschel Multi-tiered Extragalactic Survey) collaboration, performed with the Herschel Observatory SPIRE multiwavelength camera, to estimate the low-redshift, 0.02 < z < 0.5, monochromatic luminosity functions (LFs) of galaxies at 250, 350 and 500 µm. Within this redshift…
X-ray detection of warm ionized matter in the Galactic halo
Piro, L.; Guainazzi, M.; Elvis, M. +5 more
We report on a systematic investigation of the cold and mildly ionized gaseous baryonic metal components of our Galaxy, through the analysis of high-resolution Chandra and XMM-Newton spectra of two samples of Galactic and extragalactic sources. The comparison between lines of sight towards sources located in the disc of our Galaxy and extragalacti…
Broad-band spectral analysis of the accreting millisecond X-ray pulsar SAX J1748.9-2021
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
We analysed a 115-ks XMM-Newton observation and the stacking of 8 d of INTEGRAL observations, taken during the raise of the 2015 outburst of the accreting millisecond X-ray pulsar SAX J1748.9-2021. The source showed numerous type-I burst episodes during the XMM-Newton observation, and for this reason we studied separately the persistent and burst …
Origin of the local structures at the Philae landing site and possible implications on the formation and evolution of 67P/Churyumov-Gerasimenko
Bibring, J. -P.; Gondet, B.; Langevin, Y. +7 more
In situ images of the 67P/Churyumov-Gerasimenko nucleus acquired by the CIVA cameras on-board PHILAE revealed a rough landscape dominated by consolidated materials. These data provide a unique view to constrain the past and present conditions prevailing at the surface of the comet. A quantitative analysis of microscopic structures (fractures and p…
High-energy monitoring of NGC 4593 with XMM-Newton and NuSTAR. X-ray spectral analysis
Bianchi, S.; Cappi, M.; Ponti, G. +8 more
We present results from a joint XMM-Newton/NuSTAR monitoring of the Seyfert 1 NGC 4593, consisting of 5 × 20 ks simultaneous observations spaced by 2 d, performed in 2015 January. The source is variable, both in flux and spectral shape, on time-scales down to a few ks and with a clear softer-when-brighter behaviour. In agreement with past observat…
CME impact on comet 67P/Churyumov-Gerasimenko
Glassmeier, K. -H.; Behar, E.; Möstl, C. +23 more
We present Rosetta observations from comet 67P/Churyumov-Gerasimenko during the impact of a coronal mass ejection (CME). The CME impacted on 2015 Oct 5-6, when Rosetta was about 800 km from the comet nucleus, and 1.4 au from the Sun. Upon impact, the plasma environment is compressed to the level that solar wind ions, not seen a few days earlier wh…