Search Publications
HerMES: point source catalogues from deep Herschel-SPIRE observations
Pérez-Fournon, I.; Rodighiero, G.; Valtchanov, I. +38 more
We describe the generation of single-band point source catalogues from submillimetre Herschel-SPIRE observations taken as part of the Science Demonstration Phase of the Herschel Multi-tiered Extragalactic Survey (HerMES). Flux densities are found by means of peak finding and the fitting of a Gaussian point-response function. With highly confused i…
Wide-field imaging of NGC 4365's globular cluster system: the third subpopulation revisited
Spitler, Lee R.; Forbes, Duncan A.; Blom, Christina
Analysis of the globular cluster (GC) system of the giant elliptical (E3) galaxy NGC 4365, from eight Hubble Space Telescope/Advanced Camera for Surveys pointings and a wide-field Subaru/Suprime-Cam image, is presented. Using magnitude, colour and size criteria, we obtain a catalogue of GC candidates. We also measure the photometric properties of …
Spectroscopic Signature of Alfvén Waves Damping in a Polar Coronal Hole up to 0.4 Solar Radii
Bemporad, A.; Abbo, L.
Between 2009 February 24 and 25, the EUV Imaging Spectrometer (EIS) spectrometer on board the Hinode spacecraft performed special "sit and stare" observations above the south polar coronal hole continuously over more than 22 hr. Spectra were acquired with the 1'' slit placed off-limb covering altitudes up to 0.48 R ⊙ (3.34 × 102
Nanostructuration of carbonaceous dust as seen through the positions of the 6.2 and 7.7 µm AIBs
Dartois, E.; d'Hendecourt, L.; Brunetto, R. +7 more
Context. Carbonaceous cosmic dust is observed through infrared spectroscopy either in absorption or in emission. The details of the spectral features are believed to shed some light on its structure and finally enable the study of its life cycle.
Aims: The goal is to combine several analytical tools in order to decipher the intimate nanostruc…
Nuclear star clusters and the stellar spheroids of their host galaxies
Böker, Torsten; Knigge, Christian; Leigh, Nathan
We combine published photometry for the nuclear star clusters (NSCs) and stellar spheroids of 51 low-mass, early-type galaxies in the Virgo cluster with empirical mass-to-light ratios, in order to complement previous studies that explore the dependence of NSC masses on various properties of their host galaxies. We confirm a roughly linear relation…
The Rest-frame UV-to-optical Colors and Spectral Energy Distributions of z ~ 4-7 Galaxies
Franx, Marijn; Labbé, Ivo; Bouwens, Rychard J. +4 more
We use the ultra-deep HUDF09 and the deep Early Release Science data from the HST WFC3/IR camera, along with the wide-area Spitzer/IRAC data from GOODS-S to derive spectral energy distributions (SEDs) of star-forming galaxies from the rest-frame UV to the optical over a wide luminosity range (M 1500 ~ -21 to M 1500 ~ -18) fro…
The Early Early Type: Discovery of a Passive Galaxy at z spec ~ 3
Cimatti, A.; Daddi, E.; Béthermin, M. +6 more
We present the discovery of a massive, quiescent galaxy at z = 2.99. We have obtained an Hubble Space Telescope WFC3 spectrum of this object and measured its redshift from the detection of a deep 4000 Å break consistent with an old population and a high metallicity. By stellar population modeling of both its grism spectrum and broadband photometry…
Nitrogen hydrides in interstellar gas. II. Analysis of Herschel/HIFI observations towards W49N and G10.6 - 0.4 (W31C)
Menten, K. M.; Godard, B.; Persson, C. M. +14 more
As a part of the Herschel key programme PRISMAS, we have used the Herschel/HIFI instrument to observe interstellar nitrogen hydrides along the sight-lines towards eight high-mass star-forming regions in order to elucidate the production pathways leading to nitrogen-bearing species in diffuse gas. Here, we report observations towards W49N of the NH…
Hinode/EIS Spectroscopic Validation of Very Hot Plasma Imaged with the Solar Dynamics Observatory in Non-flaring Active Region Cores
Testa, Paola; Reale, Fabio
We use coronal imaging observations with the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA), and Hinode/Extreme-ultraviolet Imaging Spectrometer (EIS) spectral data to explore the potential of narrowband EUV imaging data for diagnosing the presence of hot (T >~ 5 MK) coronal plasma in active regions. We analyze observations of tw…
The cosmological analysis of X-ray cluster surveys - II. Application of the CR-HR method to the XMM archive
Altieri, B.; Valtchanov, I.; Pierre, M. +5 more
We have processed 2774 high galactic observations from the XMM archive (as of 2010 May) and extracted a serendipitous catalogue of some 850 clusters of galaxies based on purely X-ray criteria, following the methodology developed for the XMM-Large-Scale Survey. Restricting the sample to the highest signal-to-noise ratio objects (347 clusters), we p…