Search Publications
Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates
Kneissl, R.; Dahle, H.; Miville-Deschênes, M. -A. +201 more
We present the XMM-Newton follow-up for confirmation of Planck cluster candidates. Twenty-five candidates have been observed to date using snapshot (~10ks) exposures, ten as part of a pilot programme to sample a low range of signal-to-noise ratios (4 < S/N < 6), and a further 15 in a programme to observe a sample of S/N > 5 candidates. Th…
Accretion Rate and the Physical Nature of Unobscured Active Galaxies
Koekemoer, Anton M.; Trump, Jonathan R.; Urry, C. Megan +15 more
We show how accretion rate governs the physical properties of a sample of unobscured broad-line, narrow-line, and lineless active galactic nuclei (AGNs). We avoid the systematic errors plaguing previous studies of AGN accretion rates by using accurate intrinsic accretion luminosities (L int) from well-sampled multiwavelength spectral en…
Herschel-ATLAS: first data release of the Science Demonstration Phase source catalogues
Rodighiero, G.; Ivison, R. J.; Clements, D. L. +28 more
The Herschel Astrophysical Terahertz Large Area Survey (Herschel-ATLAS) is a survey of 550 deg2 with the Herschel Space Observatory in five far-infrared and submillimetre bands. The first data for the survey, observations of a field 4 × 4 deg2 in size, were taken during the Science Demonstration Phase (SDP), and reach a 5σ no…
Planck early results. XVII. Origin of the submillimetre excess dust emission in the Magellanic Clouds
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +198 more
The integrated spectral energy distributions (SED) of the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) appear significantly flatter than expected from dust models based on their far-infrared and radio emission. The still unexplained origin of this millimetre excess is investigated here using the Planck data. The integrated SED of …
Modeling the evolution of infrared galaxies: a parametric backward evolution model
Dole, H.; Lagache, G.; Béthermin, M. +2 more
Aims: We attempt to model the infrared galaxy evolution in as simple a way as possible and reproduce statistical properties such as the number counts between 15 µm and 1.1 mm, the luminosity functions, and the redshift distributions. We then use the fitted model to interpret observations from Spitzer, AKARI, BLAST, LABOCA, AzTEC, SPT, a…
The XMM-Newton Wide Field Survey in the COSMOS Field: Redshift Evolution of AGN Bias and Subdominant Role of Mergers in Triggering Moderate-luminosity AGNs at Redshifts up to 2.2
Finoguenov, A.; Salvato, M.; Merloni, A. +14 more
We present a study of the redshift evolution of the projected correlation function of 593 X-ray selected active galactic nuclei (AGNs) with I AB < 23 and spectroscopic redshifts z < 4, extracted from the 0.5-2 keV X-ray mosaic of the 2.13 deg2 XMM- Cosmic Evolution Survey (COSMOS). We introduce a method to estimate the …
The Relative Abundance of Compact and Normal Massive Early-type Galaxies and Its Evolution from Redshift z ~ 2 to the Present
Dickinson, M.; Giavalisco, M.; Koekemoer, A. M. +11 more
We report on the evolution of the number density and size of early-type galaxies (ETGs) from z ~ 2 to z ~ 0. We select a sample of 563 massive (M > 1010 M ⊙), passively evolving (specific star formation rate <10-2 Gyr-1), and morphologically spheroidal galaxies at 0 < z < 2.5, using the panch…
Demographics of Bulge Types within 11 Mpc and Implications for Galaxy Evolution
Drory, Niv; Fisher, David B.
We present an inventory of galaxy bulge types (elliptical galaxy, classical bulge, pseudobulge, and bulgeless galaxy) in a volume-limited sample within the local 11 Mpc sphere using Spitzer 3.6 µm and Hubble Space Telescope data. We find that whether counting by number, star formation rate, or stellar mass, the dominant galaxy type in the lo…
A wide Chandra view of the core of the Perseus cluster
Churazov, E.; Young, A. J.; Fabian, A. C. +12 more
We present new Chandra images of the X-ray emission from the core of the Perseus cluster of galaxies. The total observation time is now 1.4 Ms. New depressions in X-ray surface brightness are discovered to the north of NGC 1275, which we interpret as old rising bubbles. They imply that bubbles are long-lived and do not readily breakup when rising …
Mapping the radial structure of AGN tori
Hönig, S. F.; Kishimoto, M.; Tristram, K. R. W. +3 more
We present mid-IR interferometric observations of six type 1 AGNs at multiple baseline lengths ranging from 27 m to 130 m, reaching high angular resolutions up to λ/B ~ 0.02 arcsec. For two of the targets, we have simultaneous near-IR interferometric measurements as well, taken within a week. We find that all the objects are partially resolved at …