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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…
Herschel-resolved Outer Belts of Two-belt Debris Disks—Evidence of Icy Grains
Bryden, G.; Stapelfeldt, K. R.; Werner, M. W. +1 more
We present dual-band Herschel/PACS imaging for 59 main-sequence stars with known warm dust (T warm ∼ 200 K), characterized by Spitzer. Of 57 debris disks detected at Herschel wavelengths (70 and/or 100 and 160 µm), about half have spectral energy distributions (SEDs) that suggest two-ring disk architectures mirroring that of the a…
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 …
The He II Proximity Effect and The Lifetime of Quasars
Worseck, G.; Hennawi, J. F.; McQuinn, M. +1 more
The lifetime of quasars is fundamental for understanding the growth of supermassive black holes, and is an important ingredient in models of the reionization of the intergalactic medium (IGM). However, despite various attempts to determine quasar lifetimes, current estimates from a variety of methods are uncertain by orders of magnitude. This work…
The SHARDDS survey: First resolved image of the HD 114082 debris disk in the Lower Centaurus Crux with SPHERE
Pueyo, Laurent; Ertel, Steve; Boccaletti, Anthony +17 more
We present the first resolved image of the debris disk around the 16 ± 8 Myr old star, HD 114082. The observation was made in the H-band using the SPHERE instrument. The star is at a distance of 92 ± 6 pc in the Lower Centaurus Crux association. Using a Markov chain Monte Carlo analysis, we determined that the debris is likely in the form of a dus…
Discovery of an Extremely Wide-angle Bipolar Outflow in AFGL 5142
Kim, Kee-Tae; Lee, Jeong-Eun; Li, Di +12 more
Most bipolar outflows are associated with individual young stellar objects and have small opening angles. Here we report the discovery of an extremely wide-angle (∼180°) bipolar outflow (“EWBO”) in a cluster forming region AFGL 5142 from low-velocity emission of the HCN (3-2) and HCO+ (3-2) lines. This bipolar outflow is along a north-w…
Another look at distortions of the Cosmic Microwave Background spectrum
Negrello, M.; Lapi, A.; De Zotti, G. +2 more
We review aspects of Cosmic Microwave Background (CMB) spectral distortions which do not appear to have been fully explored in the literature. In particular, implications of recent evidences of heating of the intergalactic medium (IGM) by feedback from active galactic nuclei are investigated. Taking also into account the IGM heating associated to …
The dust environment of comet 67P/Churyumov-Gerasimenko from Rosetta OSIRIS and VLT observations in the 4.5 to 2.9 AU heliocentric distance range inbound
Jorda, L.; Lamy, P. L.; Lara, L. M. +51 more
Context. The ESA Rosetta spacecraft, currently orbiting around comet 67P/Churyumov-Gerasimenko, has already provided in situ measurements of the dust grain properties from several instruments,particularly OSIRIS and GIADA. We propose adding value to those measurements by combining them with ground-based observations of the dust tail to monitor the…
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…