Search Publications
Star cluster formation and evolution in Mrk 930: properties of a metal-poor starburst
Östlin, G.; Adamo, A.; Zackrisson, E. +4 more
We present the analysis of the large population of star clusters in the blue compact galaxy (BCG) Mrk 930. The study has been conducted by means of a photometric analysis of multiband data obtained with the Hubble Space Telescope (HST). We have reconstructed the spectral energy distributions of the star clusters and estimated the age, mass and ext…
The core-collapse supernova rate in Arp 299 revisited
Kankare, E.; Alberdi, A.; Ryder, S. D. +3 more
We present a study of the core-collapse supernova (CCSN) rate in nuclei A and B1, of the luminous infrared galaxy (LIRG) Arp 299, based on ∼11 yr of Very Large Array (VLA) monitoring of their radio emission at 8.4 GHz. Significant variations in the nuclear radio flux density can be used to identify the CCSN activity in the absence of high-resoluti…
Suzaku Observations of the HMXB 1A 1118-61
Makishima, Kazuo; Terada, Yukikatsu; Rothschild, Richard E. +12 more
We present broadband analysis of the Be/X-ray transient 1A 1118-61 by Suzaku at the peak of its third observed outburst in 2009 January and two weeks later when the source flux had decayed by an order of magnitude. The continuum was modeled with a cutoffpl model as well as a compTT model, with both cases requiring an additional blackbody component…
HST/NICMOS Imaging of Bright High-redshift 24 µm Selected Galaxies: Merging Properties
Helou, George; Surace, Jason; Yan, Lin +4 more
We present new results on the physical nature of infrared-luminous sources at 0.5 < z < 2.8 as revealed by HST/NICMOS imaging and Infrared Spectrograph mid-infrared spectroscopy. Our sample consists of 134 galaxies selected at 24 µm with a flux of S(24 µm)>0.9 mJy. We find many (~60%) of our sources to possess an important bul…
Integral-field spectroscopy of (90482) Orcus-Vanth
Berthier, J.; Carry, B.; Hestroffer, D. +8 more
Aims: We seek to constrain the surface composition of the trans-Neptunian object (90482) Orcus and its small satellite Vanth, as well as their mass and density.
Methods: We acquired near-infrared spectra (1.4-2.4 µm) of (90482) Orcus and its companion Vanth using the adaptive-optics-fed integral-field spectrograph SINFONI mounted o…
Simulation of the Unusual Solar Minimum with 3D SIP-CESE MHD Model by Comparison with Multi-Satellite Observations
Wu, S. T.; Feng, Xueshang; Zhang, Shaohua +2 more
The observations both near the Sun and in the heliosphere during the activity minimum between solar cycles 23 and 24 exhibit different phenomena from those typical of the previous solar minima. In this paper, we have chosen Carrington rotation 2070 in 2008 to investigate the properties of the background solar wind by using the three-dimensional (3…
From large scale gas compression to cluster formation in the Antennae overlap region
Boulanger, F.; Nesvadba, N. P. H.; Herrera, C. N.
We present a detailed observational analysis of how merger-driven turbulence may regulate the star-formation efficiency during galaxy interactions and set the initial conditions for the formation of super star clusters. Using VLT/SINFONI, we obtained near-infrared imaging spectroscopy of a small region in the Antennae overlap region, coincident wi…
Transiting exoplanets from the CoRoT space mission. XVI. CoRoT-14b: an unusually dense very hot Jupiter
Mazeh, T.; Aigrain, S.; Alonso, R. +46 more
In this paper, the CoRoT ExoplanetScience Team announces its 14th discovery. Herein, we discuss the observations and analyses that allowed us to derive the parameters of this system: a hot Jupiter with a mass of 7.6 ± 0.6 Jupiter masses orbiting a solar-type star (F9V) with a period of only 1.5 d, less than 5 stellar radii from its parent star. It…
Broad Lyα Emission from Three Nearby BL Lacertae Objects
Perlman, Eric S.; Danforth, Charles W.; Stocke, John T.
We present far-UV HST/COS spectra of four nearby BL Lac objects. BL Lac spectra are dominated by a smooth, power-law continuum which arises in a relativistic jet. However, the spectra are not necessarily featureless; weak, broad- and/or narrow-line emission is sometimes seen in high-quality optical spectra. We present detections of Lyα emission in…
Chandra Detection of SN 2010da Four Months After Outburst: Evidence for a High-mass X-Ray Binary in NGC 300
Dalcanton, J. J.; Kong, A. K. H.; Weisz, D. R. +4 more
We present the results of a 63 ks Chandra observation of the "supernova impostor" SN 2010da four months after it was first observed on 2010 May 24. We detect an X-ray source at ~7σ confidence coincident with the optical location of the outburst. Our imaging analysis has revealed a hard central point source, surrounded by soft diffuse emission exte…