Search Publications
Physical properties of z > 4 submillimeter galaxies in the COSMOS field
Bondi, M.; Finoguenov, A.; Magnelli, B. +31 more
We investigate the physical properties of a sample of six submillimeter galaxies (SMGs) in the COSMOS field, spectroscopically confirmed to lie at redshifts z> 4. While the redshifts for four of these SMGs were previously known, we present here two newly discovered zspec> 4 SMGs. For our analysis we employ the rich (X-ray to radio…
Galactic cold cores. V. Dust opacity
Bernard, J. -P.; Juvela, M.; Marshall, D. J. +13 more
Context. The project Galactic Cold Cores has carried out Herschel photometric observations of interstellar clouds where the Planck satellite survey has located cold and compact clumps. The sources represent different stages of cloud evolution from starless clumps to protostellar cores and are located in different Galactic environments.
Aims: …
Benchmark stars for Gaia Fundamental properties of the Population II star HD 140283 from interferometric, spectroscopic, and photometric data
Morel, P.; Berio, P.; Meilland, A. +18 more
Metal-poor halo stars are important astrophysical laboratories that allow us to unravel details about many aspects of astrophysics, including the chemical conditions at the formation of our Galaxy, understanding the processes of diffusion in stellar interiors, and determining precise effective temperatures and calibration of colour-effective tempe…
Properties of solar energetic particle events inferred from their associated radio emission
Valtonen, E.; Hillaris, A.; Malandraki, O. +6 more
Aims: We study selected properties of solar energetic particle (SEP) events as inferred from their associated radio emissions.
Methods: We used a catalogue of 115 SEP events, which consists of entries of proton intensity enhancements at one AU, with complete coverage over solar cycle 23 based on high-energy (~68 MeV) protons from SOHO/ER…
Frontier Fields: Combining HST, VLT, and Spitzer data to explore the z ~ 8 Universe behind the lensing cluster MACSJ0416.1-2403
Pérez-Fournon, I.; Laporte, N.; Infante, L. +7 more
Context. The Hubble Space Telescope (HST) Frontier Fields (HFFs) project started at the end of 2013 with the aim of providing extremely deep images of six massive galaxy clusters. One of the main goals of this program is to push several telescopes to their limits to provide the best current view of the earliest stages of the Universe. The analysis…
Possible link between the power spectrum of interstellar filaments and the origin of the prestellar core mass function
Hill, T.; André, Ph.; Arzoumanian, D. +17 more
A complete understanding of the origin of the prestellar core mass function (CMF) is crucial. Two major features of the prestellar CMF are 1) a broad peak below 1 M⊙, presumably corresponding to a mean gravitational fragmentation scale, and 2) a characteristic power-law slope, very similar to the Salpeter slope of the stellar initial ma…
Seismic sensitivity to sub-surface solar activity from 18 yr of GOLF/SoHO observations
García, R. A.; Turck-Chièze, S.; Salabert, D.
Solar activity has significantly changed over the last two Schwabe cycles. After a long and deep minimum at the end of Cycle 23, the weaker activity of Cycle 24 contrasts with the previous cycles. In this work, the response of the solar acoustic oscillations to solar activity is used in order to provide insights into the structural and magnetic ch…
Planck intermediate results. XXV. The Andromeda galaxy as seen by Planck
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +202 more
The Andromeda galaxy (M 31) is one of a few galaxies that has sufficient angular size on the sky to be resolved by the Planck satellite. Planck has detected M 31 in all of its frequency bands, and has mapped out the dust emission with the High Frequency Instrument, clearly resolving multiple spiralarms and sub-features. We examine the morphology o…
Long-lived, long-period radial velocity variations in Aldebaran: A planetary companion and stellar activity
Guenther, E. W.; Zechmeister, M.; Hatzes, A. P. +14 more
Aims: We investigate the nature of the long-period radial velocity variations in α Tau first reported over 20 yr ago.
Methods: We analyzed precise stellar radial velocity measurements for α Tau spanning over 30 yr. An examination of the Hα and Ca II λ8662 spectral lines, and Hipparcos photometry was also done to help discern the nature o…
On the triple peaks of SNHunt248 in NGC 5806
Sollerman, J.; Jerkstrand, A.; Smartt, S. J. +19 more
We present our findings on a supernova (SN) impostor, SNHunt248, based on optical and near-IR data spanning ~15 yr before discovery, to ~1 yr post-discovery. The light curve displays three distinct peaks, the brightest of which is at MR ~ -15.0 mag. The post-discovery evolution is consistent with the ejecta from the outburst interacting…