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Mass assembly and morphological transformations since z ∼ 3 from CANDELS
Daddi, E.; Kartaltepe, J. S.; Koekemoer, A. M. +14 more
We quantify the evolution of the stellar mass functions (SMFs) of star-forming and quiescent galaxies as a function of morphology from z ∼ 3 to the present. Our sample consists of ∼50 000 galaxies in the CANDELS fields (∼880 arcmin2), which we divide into four main morphological types, I.e. pure bulge-dominated systems, pure spiral disc…
Searching for decaying dark matter in deep XMM-Newton observation of the Draco dwarf spheroidal
Boyarsky, Alexey; Ruchayskiy, Oleg; Bulbul, Esra +6 more
We present results of a search for the 3.5 keV emission line in our recent very long (∼ 1.4 Ms) XMM-Newton observation of the Draco dwarf spheroidal galaxy. The astrophysical X-ray emission from such dark matter-dominated galaxies is faint, thus they provide a test for the dark matter origin of the 3.5 keV line previously detected in other massive…
Multiple stellar populations in Magellanic Cloud clusters - IV. The double main sequence of the young cluster NGC 1755
Da Costa, G. S.; Milone, A. P.; Marino, A. F. +4 more
Nearly all the star clusters with ages of ∼1-2 Gyr in both Magellanic Clouds exhibit an extended main-sequence turn-off (eMSTO) whose origin is under debate. The main scenarios suggest that the eMSTO could be either due to multiple generations of stars with different ages or to coeval stellar populations with different rotation rates. In this pape…
The Herschel-ATLAS Data Release 1 - II. Multi-wavelength counterparts to submillimetre sources
Ivison, R. J.; Dunlop, J. S.; Cooray, A. +27 more
This paper is the second in a pair of papers presenting data release 1 (DR1) of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS), the largest single open-time key project carried out with the Herschel Space Observatory. The H-ATLAS is a wide-area imaging survey carried out in five photometric bands at 100, 160, 250, 350 and 500 &mi…
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…