Search Publications
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…
The detection and X-ray view of the changing look AGN HE 1136-2304
Harrison, F. A.; Schartel, N.; Rodríguez-Pascual, P. M. +9 more
We report the detection of high-amplitude X-ray flaring of the AGN HE 1136-2304, which is accompanied by a strong increase in the flux of the broad Balmer lines, changing its Seyfert type from almost type 2 in 1993 down to 1.5 in 2014. HE 1136-2304 was detected by the XMM-Newton slew survey at >10 times the flux it had in the ROSAT all-sky surv…
ZFOURGE catalogue of AGN candidates: an enhancement of 160-µm-derived star formation rates in active galaxies to z = 3.2
Papovich, Casey; van Dokkum, Pieter G.; Allen, Rebecca J. +15 more
We investigate active galactic nuclei (AGN) candidates within the FourStar Galaxy Evolution Survey (ZFOURGE) to determine the impact they have on star formation in their host galaxies. We first identify a population of radio, X-ray, and infrared-selected AGN by cross-matching the deep Ks-band imaging of ZFOURGE with overlapping multiwav…
Star formation rates in luminous quasars at 2 < z < 3
Clements, David L.; Chapman, Scott; Vieira, Joaquin +22 more
We investigate the relation between star formation rates (dot{{M}}_s) and AGN properties in optically selected type 1 quasars at 2 < z < 3 using data from Herschel and the SDSS. We find that dot{{M}}_s remains approximately constant with redshift, at 300 ± 100 M⊙ yr-1. Conversely, dot{{M}}_s increases with AGN luminosit…
Quantifying the (X/peanut)-shaped structure in edge-on disc galaxies: length, strength, and nested peanuts
Ciambur, Bogdan C.; Graham, Alister W.
X-shaped or peanut-shaped (X/P) bulges are observed in more than 40 per cent of (nearly) edge-on disc galaxies, though to date a robust method to quantify them is lacking. Using Fourier harmonics to describe the deviation of galaxy isophotes from ellipses, we demonstrate with a sample of 11 such galaxies (including NGC 128) that the sixth Fourier …