Search Publications
The highly active Anhur-Bes regions in the 67P/Churyumov-Gerasimenko comet: results from OSIRIS/ROSETTA observations
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +51 more
The Southern hemisphere of the 67P/Churyumov-Gerasimenko comet has become visible from Rosetta only since 2015 March. It was illuminated during the perihelion passage and therefore it contains the regions that experienced the strongest heating and erosion rates, thus exposing the sub-surface most pristine material. In this work we investigate, tha…
The MUSE view of the host galaxy of GRB 100316D
Covino, S.; Sánchez-Ramírez, R.; Della Valle, M. +23 more
The low distance, z = 0.0591, of GRB 100316D and its association with SN 2010bh represent two important motivations for studying this host galaxy and the GRB's immediate environment with the integral field spectrographs like Very Large Telescope/Multi-Unit Spectroscopic Explorer. Its large field of view allows us to create 2D maps of gas metallici…
Primeval very low-mass stars and brown dwarfs - II. The most metal-poor substellar object
Homeier, D.; Pinfield, D. J.; Jones, H. R. A. +4 more
SDSS J010448.46+153501.8 has previously been classified as an sdM9.5 subdwarf. However, its very blue J - K colour (-0.15 ± 0.17) suggests a much lower metallicity compared to normal sdM9.5 subdwarfs. Here, we re-classify this object as a usdL1.5 subdwarf based on a new optical and near-infrared spectrum obtained with X-shooter on the Very Large T…
Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies
Babul, Arif; Bertoldi, Frank; Bonafede, Annalisa +4 more
Radio haloes are diffuse synchrotron sources on scales of ∼1 Mpc that are found in merging clusters of galaxies, and are believed to be powered by electrons re-accelerated by merger-driven turbulence. We present measurements of extended radio emission on similarly large scales in two clusters of galaxies hosting cool cores: Abell 2390 and Abell 22…
A stellar census of the nearby, young 32 Orionis group
Murphy, Simon J.; Mamajek, Eric E.; Bell, Cameron P. M.
The 32 Orionis group was discovered almost a decade ago and despite the fact that it represents the first northern, young (age ∼ 25 Myr) stellar aggregate within 100 pc of the Sun (d ≃ 93 pc), a comprehensive survey for members and detailed characterization of the group has yet to be performed. We present the first large-scale spectroscopic survey…
A remarkably large depleted core in the Abell 2029 BCG IC 1101
Graham, Alister W.; Knapen, Johan H.; Dullo, Bililign T.
We report the discovery of an extremely large (Rb ∼2.77 arcsec ≈ 4.2 kpc) core in the brightest cluster galaxy, IC 1101, of the rich galaxy cluster Abell 2029. Luminous core-Sérsic galaxies contain depleted cores - with sizes (Rb) typically 20-500 pc - that are thought to be formed by coalescing black hole binaries. We fit a …
VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35
Rodighiero, G.; Ivison, R. J.; Cooray, A. +24 more
We present an extragalactic survey using observations from the Atacama Large Millimeter/submillimeter Array (ALMA) to characterize galaxy populations up to z = 0.35: the Valparaíso ALMA Line Emission Survey (VALES). We use ALMA Band-3 CO(1-0) observations to study the molecular gas content in a sample of 67 dusty normal star-forming galaxies selec…
Star formation and AGN activity in a sample of local luminous infrared galaxies through multiwavelength characterization
Mattila, Seppo; Alberdi, Antxon; Väisänen, Petri +8 more
Nuclear starbursts and active galactic nucleus (AGN) activity are the main heating processes in luminous infrared galaxies (LIRGs) and their relationship is fundamental to understand galaxy evolution. In this paper, we study the star formation and AGN activity of a sample of 11 local LIRGs imaged with subarcsecond angular resolution at radio (8.4 …
Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars
Gontcharov, George A.; Mosenkov, Aleksandr V.
We compare eight sources of reddening and extinction estimates for approximately 60 000 Gaia DR1 Tycho-Gaia Astrometric Solution (TGAS) main sequence stars younger than 3 Gyr with a relative error of the Gaia parallax less than 0.1. For the majority of the stars, the best 2D dust emission-based reddening maps show considerable differences between …
Massive 70 µm quiet clumps I: evidence of embedded low/intermediate-mass star formation activity
Peretto, N.; Schisano, E.; Billot, N. +5 more
Massive clumps, prior to the formation of any visible protostars, are the best candidates to search for the elusive massive starless cores. In this work, we investigate the dust and gas properties of massive clumps selected to be 70 µm quiet, therefore good starless candidates. Our sample of 18 clumps has masses 300 ≲ M ≲ 3000 M⊙,…