Search Publications
Strong interactions between g- and p-modes in the hybrid γ Doradus-δ Scuti CoRoT star ID 105733033
Mathias, P.; Debosscher, J.; Chapellier, E. +2 more
Context. The presence of stellar p- and g-modes allows us to test stellar structure models in great detail from the core to the envelope. As the driving mechanisms are not yet fully understood, the first important step is to provide clear evidence of these pulsation modes.
Aims: Recent space missions have confirmed that the γ Doradus and the …
First Science Observations with SOFIA/FORCAST: Properties of Intermediate-luminosity Protostars and Circumstellar Disks in OMC-2
Morris, Mark R.; Fischer, William J.; Calvet, Nuria +18 more
We examine eight young stellar objects in the OMC-2 star-forming region based on observations from the SOFIA/FORCAST early science phase, the Spitzer Space Telescope, the Herschel Space Observatory, Two Micron All Sky Survey, Atacama Pathfinder Experiment, and other results in the literature. We show the spectral energy distributions (SED) of thes…
Modeling Space Plasma Dynamics with Anisotropic Kappa Distributions
Schlickeiser, R.; Pierrard, V.; Lazar, M. +1 more
Space plasmas are collisionpoor and kinetic effects prevail leading to wave fluctuations, which transfer the energy to small scales: wave-particle interactions replace collisions and enhance dispersive effects heating particles and producing suprathermal populations observed at any heliospheric distance in the solar wind. At large distances collis…
Correlations in the (Sub)millimeter Background from ACT × BLAST
Hilton, Matt; Hasselfield, Matthew; Bond, J. Richard +43 more
We present measurements of the auto- and cross-frequency correlation power spectra of the cosmic (sub)millimeter background at 250, 350, and 500 µm (1200, 860, and 600 GHz) from observations made with the Balloon-borne Large Aperture Submillimeter Telescope (BLAST); and at 1380 and 2030 µm (218 and 148 GHz) from observations made with …
The infrared dust bubble N22: an expanding H ii region and the star formation around it
Esimbek, J.; Wu, G.; Ji, W. -G. +3 more
Aims: To increase the observational samples of star formation around expanding H ii regions, we analyzed the interstellar medium and star formation around N22.
Methods: We used data extracted from the seven large-scale surveys from infrared to radio wavelengths. In addition we used the JCMT observations of the J = 3-2 line of 12
Extreme Star Formation in the Host Galaxies of the Fastest Growing Supermassive Black Holes at z = 4.8
Trakhtenbrot, Benny; Netzer, Hagai; Shemmer, Ohad +2 more
We report new Herschel observations of 25 z ~= 4.8 extremely luminous optically selected active galactic nuclei (AGNs). Five of the sources have extremely large star-forming (SF) luminosities, L SF, corresponding to SF rates (SFRs) of 2800-5600 M ⊙ yr-1 assuming a Salpeter initial mass function. The remaining sourc…
Modeling the evolution of infrared galaxies: clustering of galaxies in the cosmic infrared background
Doré, O.; Lagache, G.; Béthermin, M. +1 more
Context. Star-forming galaxies are highly biased tracers of the underlying dark matter density field. Their clustering can be studied through the cosmic infrared background (CIB) anisotropies. These anisotropies have been measured from 100 µm to 2 mm in the past few years.
Aims: In this paper, we present a fully parametric model allowin…
CXOM31 J004253.1+411422: the first ultraluminous X-ray transient in M 31
Pietsch, W.; Haberl, F.; Greiner, J. +6 more
Context. We seek clarification of the nature of X-ray sources detected in M 31. Here we focus on CXOM31 J004253.1+411422, the brightness of which suggests that it belongs to the class of ultraluminous X-ray sources.
Aims: We determine the X-ray properties of sources detected in the XMM-Newton/Chandra monitoring program. We investigate spectra…
9 Sagittarii: uncovering an O-type spectroscopic binary with an 8.6 year period
Gosset, E.; Rauw, G.; De Becker, M. +4 more
Context. The O-type object 9 Sgr is a well-known synchrotron radio emitter. This feature is usually attributed to colliding-wind binary systems, but 9 Sgr was long considered a single star.
Aims: We have conducted a long-term spectroscopic monitoring of this star to investigate its multiplicity and search for evidence for wind-wind interactio…
Cosmic Evolution of Star Formation Enhancement in Close Major-merger Galaxy Pairs Since z = 1
Berta, S.; Magnelli, B.; Lutz, D. +22 more
The infrared (IR) emission of "M * galaxies" (1010.4 <= M star <= 1011.0 M ⊙) in galaxy pairs, derived using data obtained in Herschel (PEP/HerMES) and Spitzer (S-COSMOS) surveys, is compared to that of single-disk galaxies in well-matched control samples to study the cosmic evolution of…