Search Publications
The Hercules stream as seen by APOGEE-2 South
Bizyaev, Dmitry; Bovy, Jo; Pan, Kaike +15 more
The Hercules stream is a group of comoving stars in the solar neighbourhood, which can potentially be explained as a signature of either the outer Lindblad resonance (OLR) of a fast Galactic bar or the corotation resonance (CR) of a slower bar. In either case, the feature should be present over a large area of the disc. With the recent commissioni…
Massive stars in the hinterland of the young cluster, Westerlund 2
Monguió, M.; Herrero, A.; Wright, N. J. +4 more
An unsettled question concerning the formation and distribution of massive stars is whether they must be born in massive clusters and, if found in less dense environments, whether they must have migrated there. With the advent of wide-area digital photometric surveys, it is now possible to identify massive stars away from prominent Galactic cluste…
The Far-Infrared Radio Correlation at low radio frequency with LOFAR/H-ATLAS
Prandoni, I.; Hardcastle, M. J.; Dunne, L. +14 more
The radio and far-infrared luminosities of star-forming galaxies are tightly correlated over several orders of magnitude; this is known as the far-infrared radio correlation (FIRC). Previous studies have shown that a host of factors conspire to maintain a tight and linear FIRC, despite many models predicting deviation. This discrepancy between exp…
The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
Done, Chris; Landt, Hermine; Boisson, Catherine +7 more
The detection of several radio-loud narrow-line Seyfert 1 (NLS1) galaxies by the Fermi Gamma-Ray Space Telescope hints at the existence of a rare, new class of γ-ray emitting active galactic nuclei with low black hole masses. Like flat spectrum radio quasars (FSRQs), their γ-ray emission is thought to be produced via the external Compton mechanism…
The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features
Charles, P. A.; Armas Padilla, M.; Jiménez-Ibarra, F. +19 more
The black hole transient V404 Cygni exhibited a bright outburst in June 2015 that was intensively followed over a wide range of wavelengths. Our team obtained high time resolution optical spectroscopy (! ∼ ! 90 s), which included a detailed coverage of the most active phase of the event. We present a data base consisting of 651 optical spectra obt…
Quantifying the AGN-driven outflows in ULIRGs (QUADROS) III: measurements of the radii and kinetic powers of eight near-nuclear outflows
Tadhunter, C. N.; Rose, M.; Rodríguez Zaurín, J. +1 more
As part of the Quantifying ULIRG AGN-driven Outflows (QUADROS) project to quantify the impact of active galactic nuclei (AGN)-driven outflows in rapidly evolving galaxies in the local Universe, we present observations of eight nearby ultraluminous infrared galaxies (ULIRGs, 0.04 <z < 0.2) taken with the Intermediate-dispersion Spectrograph a…
The fate of the Antennae galaxies
Naab, Thorsten; Johansson, Peter H.; Lahén, Natalia +2 more
We present a high-resolution smoothed particle hydrodynamic simulation of the Antennae galaxies (NGC 4038/4039) and follow the evolution 3 Gyr beyond the final coalescence. The simulation includes metallicity-dependent cooling, star formation, and both stellar feedback and chemical enrichment. The simulated best-match Antennae reproduce well both …
Investigating cluster astrophysics and cosmology with cross-correlation of the thermal Sunyaev-Zel'dovich effect and weak lensing
Nagai, Daisuke; Osato, Ken; Yoshida, Naoki +2 more
Recent detections of the cross-correlation of the thermal Sunyaev-Zel'dovich (tSZ) effect and weak gravitational lensing (WL) enable unique studies of cluster astrophysics and cosmology. In this work, we present constraints on the amplitude of the non-thermal pressure fraction in galaxy clusters, α0, and the amplitude of the matter powe…
A stratified ultrafast outflow in 1H0707-495?
Fabian, A. C.; Pinto, C.; Buisson, D. J. K. +3 more
Ultrafast outflows (UFOs) have recently been found in the spectra of a number of active galactic nuclei (AGN) and are strong candidates for driving AGN feedback. 1H0707-495 is a highly accreting narrow line Seyfert 1 and the second most X-ray variable bright AGN. Previous studies found evidence of blueshifted absorption at 0.1-0.2c in its spectrum…
ALMA + VLT observations of a damped Lyman-α absorbing galaxy: massive, wide CO emission, gas-rich but with very low SFR
Fynbo, J. P. U.; Dessauges-Zavadsky, M.; Christensen, L. +7 more
We are undertaking an Atacama Large Millimeter Array survey of molecular gas in galaxies selected for their strong H I absorption, so-called damped Lyα absorber (DLA)/sub-DLA galaxies. Here, we report CO(2-1) detection from a DLA galaxy at z = 0.716. We also present optical and near-infrared (NIR) spectra of the galaxy revealing [O II], Hα, and [N…