Search Publications
A very deep Chandra view of metals, sloshing and feedback in the Centaurus cluster of galaxies
Fabian, A. C.; Hlavacek-Larrondo, J.; Blundell, K. M. +6 more
We examine deep Chandra X-ray observations of the Centaurus cluster of galaxies, Abell 3526. Applying a gradient magnitude filter reveals a wealth of structure, from filamentary soft emission on 100 pc (0.5 arcsec) scales close to the nucleus to features 10 s of kpc in size at larger radii. The cluster contains multiple high-metallicity regions wi…
The brighter galaxies reionized the Universe
Schaye, Joop; Theuns, Tom; Frenk, Carlos +4 more
Hydrogen in the Universe was (re)ionized between redshifts z ≈ 10 and z ≈ 6. The nature of the sources of the ionizing radiation is hotly debated, with faint galaxies below current detection limits regarded as prime candidates. Here, we consider a scenario in which ionizing photons escape through channels punctured in the interstellar medium by ou…
The MIXR sample: AGN activity versus star formation across the cross-correlation of WISE, 3XMM, and FIRST/NVSS
Hardcastle, M. J.; Pineau, F. -X.; Blain, A. +7 more
We cross-correlate the largest available mid-infrared (Wide-field Infrared Survey Explorer - WISE), X-ray (3XMM) and radio (Faint Images of the Radio Sky at Twenty centimetres+NRAO VLA Sky Survey) catalogues to define the MIXR sample of AGN and star-forming galaxies. We pre-classify the sources based on their positions on the WISE colour/colour pl…
A path towards understanding the rotation-activity relation of M dwarfs with K2 mission, X-ray and UV data
Scholz, A.; Damasso, M.; Stelzer, B. +1 more
We study the relation between stellar rotation and magnetic activity for a sample of 134 bright, nearby M dwarfs observed in the Kepler Two-Wheel (K2) mission during campaigns C0-C4. The K2 light curves yield photometrically derived rotation periods for 97 stars (79 of which without previous period measurement), as well as various measures for act…
The disappearance of the helium-giant progenitor of the Type Ib supernova iPTF13bvn and constraints on its companion
Maund, J. R.; Eldridge, J. J.
We report and discuss post-explosion observations of supernova iPTF13bvn. We find that the brightness of the supernova (SN) at +740 d is below the level of the pre-explosion source and thus confirm that the progenitor has exploded. We estimate that the late-time brightness is still dominated by the SN, which constrains the magnitude and thus mass …
The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23
Smail, Ian; Sobral, David; Matthee, Jorryt +4 more
We present the first results from our CAlibrating LYMan α with Hα (CALYMHA) pilot survey at the Isaac Newton Telescope. We measure Lyα emission for 488 Hα selected galaxies at z = 2.23 from High-z Emission Line Survey in the COSMOS and UDS fields with a specially designed narrow-band filter (λc = 3918 Å, Δλ = 52 Å). We find 17 dual Hα-L…
A young star-forming galaxy at z = 3.5 with an extended Lyman α halo seen with MUSE
Bacon, Roland; Blaizot, Jérémy; Brinchmann, Jarle +12 more
Spatially resolved studies of high-redshift galaxies, an essential insight into galaxy formation processes, have been mostly limited to stacking or unusually bright objects. We present here the study of a typical (L*, M⋆ = 6 × 109 M⊙) young lensed galaxy at z = 3.5, observed with Multi Unit Spectroscopic Explorer (…
A deep XMM-Newton study of the hot gaseous halo around NGC 1961
Bregman, Joel N.; Churazov, Eugene; Anderson, Michael E.
We examine 11 XMM-Newton observations of the giant spiral galaxy NGC 1961, allowing us to study the hot gaseous halo of a spiral galaxy in unprecedented detail. We perform a spatial and a spectral analysis; with the former, the hot halo is detected to at least 80 kpc and with the latter its properties can be measured in detail up to 42 kpc. We fin…
AGN are cooler than you think: the intrinsic far-IR emission from QSOs
Oliver, S. J.; Page, M. J.; Symeonidis, M. +4 more
We present an intrinsic AGN spectral energy distribution (SED) extending from the optical to the submm, derived with a sample of unobscured, optically luminous (νLν,5100 > 1043.5 erg s-1) QSOs at z < 0.18 from the Palomar Green survey. The intrinsic AGN SED was computed by removing the contribution from stars…
Thermal SZ fluctuations in the ICM: probing turbulence and thermodynamics in Coma cluster with Planck
Khatri, Rishi; Gaspari, Massimo
We report the detection of thermal Sunyaev-Zeldovich (SZ) effect fluctuations in the intracluster medium (ICM) of Coma cluster observed with Planck. The SZ data links the maximum observable X-ray scale to the large Mpc scale, extending our knowledge of the power spectrum of ICM fluctuations. Deprojecting the 2D SZ perturbations into 3D pressure fl…