Search Publications
Herschel -ATLAS: revealing dust build-up and decline across gas, dust and stellar mass selected samples - I. Scaling relations
Ivison, R. J.; Baes, M.; Baker, A. J. +19 more
We present a study of the dust, stars and atomic gas (H I) in an H I-selected sample of local galaxies (z < 0.035) in the Herschel Astrophysical Terahertz Large Area Survey fields. This H I-selected sample reveals a population of very high gas fraction (>80 per cent), low stellar mass sources that appear to be in the earliest stages of their…
Gaia16apd - a link between fast and slowly declining type I superluminous supernovae
Lundqvist, P.; Wyrzykowski, Ł.; Kankare, E. +18 more
We present ultraviolet (UV), optical and infrared photometry and optical spectroscopy of the type Ic superluminous supernova (SLSN) Gaia16apd (=SN 2016eay), covering its evolution from 26 d before the g-band peak to 234.1 d after the peak. Gaia16apd was followed as a part of the NOT Unbiased Transient Survey (NUTS). It is one of the closest SLSNe …
Assessing distances and consistency of kinematics in Gaia/TGAS
Schönrich, Ralph; Aumer, Michael
We apply the statistical methods by Schönrich, Binney & Asplund to assess the quality of distances and kinematics in the Radial Velocity Experiment (RAVE)-Tycho-Gaia Astrometric Solution (TGAS) and Large Sky Area Multiobject Fiber Spectroscopic Telescope (LAMOST)-TGAS samples of Solar neighbourhood stars. These methods yield a nominal distance…
Cosmological constraints from thermal Sunyaev-Zeldovich power spectrum revisited
Seljak, U.; Horowitz, B.
Thermal Sunyaev-Zeldovich (tSZ) power spectrum is one of the most sensitive methods to constrain cosmological parameters, scaling as the amplitude σ _8^8. It is determined by the integral over the halo mass function multiplied by the total pressure content of clusters and further convolved by the cluster gas pressure profile. It has been shown tha…
Nitrogen-to-carbon atomic ratio measured by COSIMA in the particles of comet 67P/Churyumov-Gerasimenko
Langevin, Yves; Fischer, Henning; Briois, Christelle +24 more
The COmetary Secondary Ion Mass Analyzer (COSIMA) on board the Rosetta mission has analysed numerous cometary dust particles collected at very low velocities (a few m s-1) in the environment of comet 67P/Churyumov-Gerasimenko (hereafter 67P). In these particles, carbon and nitrogen are expected mainly to be part of the organic matter. W…
Evidence for multiple populations in the intermediate-age cluster Lindsay 1 in the SMC
Rejkuba, M.; Bastian, N.; Lardo, C. +6 more
Lindsay 1 is an intermediate-age (≈8 Gyr) massive cluster in the Small Magellanic Cloud. Using VLT FORS2 spectra of 16 probable cluster members on the lower red giant branch of the cluster, we measure CN and CH band strengths (at ≃ 3883 and 4300 Å, respectively), along with carbon and nitrogen abundances and find that a sub-population of stars has…
Evolution of the reverberation lag in GX 339-4 at the end of an outburst
Ponti, G.; Tomsick, J. A.; Rodriguez, J. +13 more
We studied X-ray reverberation lags in the Black hole X-ray binary (BHXRB) GX 339-4 at the end of the 2014-2015 outburst. We analysed data from an XMM-Newton campaign covering the end of the transition from the soft to hard state, and the decrease of luminosity in the hard state. During all the observations we detected, at high frequencies, signif…
Constraints on the Lyman continuum escape fraction for faint star-forming galaxies
Tozzi, P.; Balestra, I.; Rosati, P. +6 more
Star-forming galaxies have long been considered the dominant sources of the cosmic ultraviolet background radiation at early epochs. However, observing and characterizing the galaxy population with significant ionizing emission have proven to be challenging. In particular, the fraction of ionizing radiation that escapes the local environment to th…
Dissecting the extended main-sequence turn-off of the young star cluster NGC 1850
Bellini, Andrea; Goudfrooij, Paul; Puzia, Thomas H. +2 more
We use the Wide Field Camera 3 onboard the Hubble Space Telescope to obtain deep, high-resolution photometry of the young (∼100 Myr) star cluster NGC 1850 in the Large Magellanic Cloud. We analyse the cluster colour-magnitude diagram (CMD) and find that it hosts an extended main-sequence turn-off (MSTO) and a double main sequence (MS). We demonstr…
Strong lensing signatures of luminous structure and substructure in early-type galaxies
Treu, Tommaso; Keeton, Charles R.; Nierenberg, Anna M. +2 more
The arrival times, positions and fluxes of multiple images in strong lens systems can be used to infer the presence of dark subhaloes in the deflector, and thus test predictions of cold dark matter models. However, gravitational lensing does not distinguish between perturbations to a smooth gravitational potential arising from baryonic and non-bar…