Search Publications
A closer look at the `characteristic' width of molecular cloud filaments
Panopoulou, G. V.; Tassis, K.; Skalidis, R. +2 more
Filaments in Herschel molecular cloud images are found to exhibit a 'characteristic width'. This finding is in tension with spatial power spectra of the data, which show no indication of this characteristic scale. We demonstrate that this discrepancy is a result of the methodology adopted for measuring filament widths. First, we perform the previo…
Galaxy Zoo: morphological classifications for 120 000 galaxies in HST legacy imaging
Scarlata, Claudia; Schawinski, Kevin; Griffith, Roger L. +18 more
We present the data release paper for the Galaxy Zoo: Hubble (GZH) project. This is the third phase in a large effort to measure reliable, detailed morphologies of galaxies by using crowdsourced visual classifications of colour-composite images. Images in GZH were selected from various publicly released Hubble Space Telescope legacy programmes con…
Tracing the Hercules stream with Gaia and LAMOST: new evidence for a fast bar in the Milky Way
Famaey, Benoit; Kawata, Daisuke; Hunt, Jason A. S. +1 more
The length and pattern speed of the Milky Way bar are still controversial. Photometric and spectroscopic surveys of the inner Galaxy, as well as gas kinematics, favour a long and slowly rotating bar, with corotation around a Galactocentric radius of 6 kpc. On the other hand, the existence of the Hercules stream in local velocity space favours a sh…
The Complete Local Volume Groups Sample - I. Sample selection and X-ray properties of the high-richness subsample
Babul, Arif; Raychaudhury, Somak; Ponman, Trevor J. +7 more
We present the Complete Local-Volume Groups Sample (CLoGS), a statistically complete optically selected sample of 53 groups within 80 Mpc. Our goal is to combine X-ray, radio and optical data to investigate the relationship between member galaxies, their active nuclei and the hot intra-group medium (IGM). We describe sample selection, define a 26-…
Beyond the Kepler/K2 bright limit: variability in the seven brightest members of the Pleiades
Aigrain, S.; Grundahl, F.; Albrecht, S. +20 more
The most powerful tests of stellar models come from the brightest stars in the sky, for which complementary techniques, such as astrometry, asteroseismology, spectroscopy and interferometry, can be combined. The K2 mission is providing a unique opportunity to obtain high-precision photometric time series for bright stars along the ecliptic. Howeve…
Multiple stellar populations in Magellanic Cloud clusters - V. The split main sequence of the young cluster NGC 1866
Anderson, J.; Milone, A. P.; Marino, A. F. +7 more
One of the most unexpected results in the field of stellar populations of the last few years is the discovery that some Magellanic Cloud globular clusters younger than ∼400 Myr exhibit bimodal main sequences (MSs) in their colour-magnitude diagrams (CMDs). Moreover, these young clusters host an extended main-sequence turn-off (eMSTO) in close anal…
Galaxy populations in massive galaxy clusters to z = 1.1: colour distribution, concentration, halo occupation number and red sequence fraction
Benoit-Lévy, A.; D'Andrea, C. B.; Zenteno, A. +70 more
We study the galaxy populations in 74 Sunyaev-Zeldovich effect selected clusters from the South Pole Telescope survey, which have been imaged in the science verification phase of the Dark Energy Survey. The sample extends up to z ∼ 1.1 with 4 × 1014 M⊙ ≤ M200 ≤ 3 × 1015M⊙. Using the band conta…
A new, faint population of X-ray transients
Yang, Guang; Brandt, William N.; Schneider, Donald P. +22 more
We report on the detection of a remarkable new fast high-energy transient found in the Chandra Deep Field-South, robustly associated with a faint (mR = 27.5 mag, zph ∼ 2.2) host in the CANDELS survey. The X-ray event is comprised of 115^{+12}_{-11} net 0.3-7.0 keV counts, with a light curve characterized by an ≈100 s rise tim…
The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419
Martocchia, S.; Dalessandro, E.; Salaris, M. +16 more
We present the third paper about our ongoing Hubble Space Telescope survey for the search for multiple stellar populations (MPs) within Magellanic Cloud clusters. We report here the analysis of NGC 419, an ∼1.5 Gyr old, massive (≳2 × 105 M⊙) star cluster in the Small Magellanic Cloud (SMC). By comparing our photometric data w…
PSZ2LenS. Weak lensing analysis of the Planck clusters in the CFHTLenS and in the RCSLenS
Izzo, Luca; Sereno, Mauro; Ettori, Stefano +3 more
The possibly unbiased selection process in surveys of the Sunyaev Zel'dovich effect can unveil new populations of galaxy clusters. We performed a weak lensing analysis of the PSZ2LenS sample, i.e. the PSZ2 galaxy clusters detected by the Planck mission in the sky portion covered by the lensing surveys CFHTLenS and RCSLenS. PSZ2LenS consists of 35 …