Search Publications
A Herschel-SPIRE survey of the Mon R2 giant molecular cloud: analysis of the gas column density probability density function
Henning, T.; Gutermuth, R.; Wolk, S. J. +8 more
We present a far-IR survey of the entire Mon R2 giant molecular cloud (GMC) with Herschel-Spectral and Photometric Imaging REceiver cross-calibrated with Planck-High Frequency Instrument data. We fit the spectral energy distributions of each pixel with a greybody function and an optimal beta value of 1.8. We find that mid-range column densities ob…
A young cluster with an extended main-sequence turnoff: confirmation of a prediction of the stellar rotation scenario
Salaris, M.; Larsen, S.; Cabrera-Ziri, I. +13 more
We present Hubble Space Telescope photometry of NGC 1850, a ∼100 Myr, ∼105 M⊙ cluster in the Large Magellanic Cloud. The colour-magnitude diagram clearly shows the presence of an extended main-sequence turnoff (eMSTO). The use of non-rotating stellar isochrones leads to an age spread of ∼40 Myr. This is in good agreement with…
Matching dust emission structures and magnetic field in high-latitude cloud L1642: comparing Herschel and Planck maps
Juvela, M.; Montier, L.; Ristorcelli, I. +7 more
The nearby cloud L1642 is one of only two known very high latitude (|b| > 30 deg) clouds actively forming stars. It is a rare example of star formation in isolated conditions, and can reveal important details of star formation in general, e.g. of the effect of magnetic fields. We compare Herschel dust emission structures and magnetic field orie…
SU Lyncis, a hard X-ray bright M giant: clues point to a large hidden population of symbiotic stars
Nuñez, N. E.; Nelson, T.; Mukai, K. +6 more
Symbiotic star surveys have traditionally relied almost exclusively on low resolution optical spectroscopy. However, we can obtain a more reliable estimate of their total Galactic population by using all available signatures of the symbiotic phenomenon. Here we report the discovery of a hard X-ray source, 4PBC J0642.9+5528, in the Swift hard X-ray…
Evidence for the thermal Sunyaev-Zel'dovich effect associated with quasar feedback
Hilton, Matt; Sifón, Cristóbal; Bond, J. Richard +20 more
Using a radio-quiet subsample of the Sloan Digital Sky Survey spectroscopic quasar catalogue, spanning redshifts 0.5-3.5, we derive the mean millimetre and far-infrared quasar spectral energy distributions (SEDs) via a stacking analysis of Atacama Cosmology Telescope and Herschel-Spectral and Photometric Imaging REceiver data. We constrain the for…
The magnetic field and dust filaments in the Polaris Flare
Panopoulou, G. V.; Tassis, K.; Psaradaki, I.
In diffuse molecular clouds, possible precursors of star-forming clouds, the effect of the magnetic field is unclear. In this work, we compare the orientations of filamentary structures in the Polaris Flare, as seen through dust emission by Herschel, to the plane-of-the-sky magnetic field orientation (Bpos) as revealed by stellar optica…
Spatially resolved galactic wind in lensed galaxy RCSGA 032727-132609
Rigby, Jane R.; Sharon, Keren; Bayliss, Matthew B. +4 more
We probe the spatial distribution of outflowing gas along four lines of sight separated by up to 6 kpc in a gravitationally lensed star-forming galaxy at z = 1.70. Using Mg II and Fe II emission and absorption as tracers, we find that the clumps of star formation are driving galactic outflows with velocities of -170 to -250 km s-1. The …
Revealing the accretion disc corona in Mrk 335 with multi-epoch X-ray spectroscopy
Ballantyne, D. R.; Keek, L.
Active galactic nuclei host an accretion disc with an X-ray producing corona around a supermassive black hole. In bright sources, such as the Seyfert 1 galaxy Mrk 335, reflection of the coronal emission off the accretion disc has been observed. Reflection produces spectral features such as an Fe Kα emission line, which allow for properties of the …
Hubble Tarantula Treasury Project - IV. The extinction law
Anderson, Jay; Grebel, Eva K.; Aloisi, Alessandra +10 more
We report on the study of interstellar extinction across the Tarantula Nebula (30 Doradus), in the Large Magellanic Cloud, using observations from the Hubble Tarantula Treasury Project in the 0.3-1.6 µm range. The considerable and patchy extinction inside the nebula causes about 3500 red clump stars to be scattered along the reddening vector…
Cross-correlation of gravitational lensing from DES Science Verification data with SPT and Planck lensing
Benoit-Lévy, A.; Bacon, D.; Nichol, R. C. +89 more
We measure the cross-correlation between weak lensing of galaxy images and of the cosmic microwave background (CMB). The effects of gravitational lensing on different sources will be correlated if the lensing is caused by the same mass fluctuations. We use galaxy shape measurements from 139 deg2 of the Dark Energy Survey (DES) Science V…