Search Publications
Abell 370 revisited: refurbished Hubble imaging of the first strong lensing cluster
Kneib, J. -P.; Jullo, E.; Richard, J. +2 more
We present a strong lensing analysis of the galaxy cluster Abell 370 (z= 0.375) based on the recent multicolour images by Advanced Camera for Surveys obtained as part of the Early Release Observation (ERO) that followed the Hubble Service Mission #4. Back in 1987, the giant gravitational arc (z= 0.725) in Abell 370 was one of the first pieces of e…
High-redshift elliptical galaxies: are they (all) really compact?
Aussel, H.; Cimatti, A.; Daddi, E. +10 more
We investigate the properties of 12 ultramassive passively evolving early-type galaxies (ETGs) at zphot > 1.4 in the COSMOS 2 deg2 field. These 12 ETGs were selected as pBzKs, have accurate 1.4 <~ zphot <~ 1.7, high Sérsic index profiles typical of ellipticals, no detection at 24µm, resulting in a co…
HerMES: deep galaxy number counts from a P(D) fluctuation analysis of SPIRE Science Demonstration Phase observations
Altieri, B.; Aussel, H.; Elbaz, D. +71 more
Dusty, star-forming galaxies contribute to a bright, currently unresolved cosmic far-infrared background. Deep Herschel-Spectral and Photometric Imaging Receiver (SPIRE) images designed to detect and characterize the galaxies that comprise this background are highly confused, such that the bulk lies below the classical confusion limit. We analyse …
Super star clusters in Haro 11: properties of a very young starburst and evidence for a near-infrared flux excess
Östlin, G.; Hayes, M.; Adamo, A. +3 more
We have used multiband imaging to investigate the nature of an extreme starburst environment in the nearby Lyman break galaxy analogue Haro 11 (ESO350-IG038) by means of its stellar cluster population. The central starburst region has been observed in eight different high-resolution Hubble Space Telescope (HST) wavebands, sampling the stellar and …
Low-velocity streams in the solar neighbourhood caused by the Galactic bar
Siebert, A.; Minchev, I.; Bienayme, O. +1 more
We find that a steady-state bar induces transient features at low velocities in the solar neighbourhood velocity distribution due to the initial response of the disc, following the formation of the bar. We associate these velocity streams with two quasi-periodic orbital families, librating around the stable x1(1) and x1(2) or…
X-ray groups and clusters of galaxies in the Subaru-XMM Deep Field
Finoguenov, A.; Smolčić, V.; McLure, R. J. +20 more
We present the results of a search for galaxy clusters in the Subaru-XMM Deep Field (SXDF). We reach a depth for a total cluster flux in the 0.5-2 keV band of 2 × 10-15 erg cm-2 s-1 over one of the widest XMM-Newton contiguous raster surveys, covering an area of 1.3deg2. Cluster candidates are identified…
The spectral energy distribution of the central parsecs of the nearest AGN
Meisenheimer, K.; Tristram, K. R. W.; Prieto, M. A. +4 more
Spectral energy distributions (SEDs) of the central few tens of parsec region of some of the nearest, most well-studied, active galactic nuclei (AGN) are presented. These genuine AGN-core SEDs, mostly from Seyfert galaxies, are characterized by two main features: an infrared (IR) bump with the maximum in the 2-10µm range and an increasing X-…
H-ATLAS: PACS imaging for the Science Demonstration Phase
Rodighiero, G.; Ivison, R. J.; de Zotti, G. +26 more
We describe the reduction of data taken with the PACS instrument on board the Herschel Space Observatory in the Science Demonstration Phase of the Herschel-ATLAS (H-ATLAS) survey, specifically data obtained for a 4 × 4 deg2 region using Herschel's fast-scan (60arcsecs-1) parallel mode. We describe in detail a pipeline for dat…
Detailed cluster mass and light profiles of A1703, A370 and RXJ1347-11 from deep Subaru imaging
Broadhurst, Tom; Oguri, Masamune; Umetsu, Keiichi +3 more
Weak lensing work can be badly compromised by unlensed foreground and cluster members which dilute the true lensing signal. We show how the lensing amplitude in multicolour space can be harnessed to securely separate cluster members from the foreground and background populations for three massive clusters, A1703 (z = 0.258), A370 (z = 0.375) and R…
HST/ACS Hα imaging of the Carina Nebula: outflow activity traced by irradiated Herbig-Haro Jets
Walborn, Nolan R.; Smith, Nathan; Bally, John
We report the discovery of new Herbig-Haro (HH) jets in the Carina Nebula, and we discuss the protostellar outflow activity of a young OB association. These are the first results of an Hα imaging survey of Carina conducted with the Hubble Space Telescope (HST)/Advanced Camera for Surveys. Adding to the one previously known example (HH 666), we det…