Search Publications
The filtering of interstellar dust in the solar system
Kempf, S.; Krüger, H.; Srama, R. +4 more
Context. Theoretical predictions demonstrate that small (<0.1 µm) interstellar grains are mostly excluded from reaching the planetary system by electromagnetic interactions in the heliopause region and in the inner heliosphere. Bigger interstellar grains have been recorded in the planetary system by dust measurements on board Ulysses and …
Relations of the energetic proton fluxes in the central plasma sheet with solar wind and geomagnetic activities
Duan, Aiying; Cao, Jinbin; Reme, Henri +1 more
this paper, using 9 years of Cluster data, we statistically investigate the relations of central plasma sheet energetic proton fluxes, ~30 keV to 380 keV, with the solar wind parameters and geomagnetic indexes. The energetic proton fluxes increase with increasing solar wind dynamical pressure and solar wind speed. The energetic proton fluxes are m…
X-Ray Grating Observations of Recurrent Nova T Pyxidis during the 2011 Outburst
Ciroi, Stefano; Cracco, Valentina; Page, Kim L. +5 more
The recurrent nova T Pyx was observed with the X-ray gratings of Chandra and XMM-Newton, 210 and 235 days, respectively, after the discovery of the 2011 April 14 outburst. The X-ray spectra show prominent emission lines of C, N, and O, with broadening corresponding to an FWHM of ~2000-3000 km s-1, and line ratios consistent with high-de…
A new nearby pulsar wind nebula overlapping the RX J0852.0-4622 supernova remnant
Ballet, J.; Terrier, R.; Acero, F. +2 more
Context. Energetic pulsars can be embedded in a nebula of relativistic leptons that is powered by the dissipation of the rotational energy of the pulsar. The object PSR J0855-4644 is an energetic and fast-spinning pulsar (Ė = 1.1 × 1036 erg s-1, P = 65 ms) discovered near the southeast rim of the supernova remnant (SNR) RX J0…
CoRoT 101186644: A transiting low-mass dense M-dwarf on an eccentric 20.7-day period orbit around a late F-star. Discovered in the CoRoT lightcurves
Mazeh, T.; Alonso, R.; Bouchy, F. +10 more
We present the study of the CoRoT transiting planet candidate 101186644, also named LRc01_E1_4780. Analysis of the CoRoT lightcurve and the HARPS spectroscopic follow-up observations of this faint (mV = 16) candidate revealed an eclipsing binary composed of a late F-type primary (Teff = 6090 ± 200 K) and a low-mass, dense lat…
The role of low-mass star clusters in massive star formation. The Orion case
Martín-Pintado, J.; Jiménez-Serra, I.; Rivilla, V. M. +1 more
Context. Different theories have been proposed to explain the formation of massive stars: two are based on accretion processes (monolithic core accretion and competitive accretion), and another on coalescence of low- and intermediate-mass stars. To distinguish between these theories, it is crucial to establish the distribution, the extinction, and…
Magnetic fields in cometary globules - IV. LBN 437
Lee, Chang Won; Soam, A.; Maheswar, G. +2 more
We present results of our R-band polarimetry of a cometary globule, LBN 437 (Gal 96-15, ℓ = 96°, b = -15°), to study the magnetic field geometry of the cloud. We estimated a distance of 360 ± 65 pc to LBN 437 (also one additional cloud, CB 238) using a near-IR photometric method. The foreground contribution to the observed polarization values was …
Short time-scale AGN X-ray variability with EXOSAT: black hole mass and normalized variability amplitude.
McHardy, I. M.
The old EXOSAT medium energy measurements of high-frequency (HF) active galactic nuclei (AGN) power spectral normalization are re-examined in the light of accurate black hole mass determinations which were not available when these data were first published by Green et al. It is found that the normalized variability amplitude (NVA), measured direct…
The Tip of the Red Giant Branch Distances to Type Ia Supernova Host Galaxies. II. M66 and M96 in the Leo I Group
Lee, Myung Gyoon; Jang, In Sung
M66 and M96 in the Leo I Group are nearby spiral galaxies hosting Type Ia supernovae (SNe Ia). We estimate the distances to these galaxies from the luminosity of the tip of the red giant branch (TRGB). We obtain VI photometry of resolved stars in these galaxies from F555W and F814W images in the Hubble Space Telescope archive. From the luminosity …
Cross-calibration of Suzaku/XIS and XMM-Newton/EPIC using galaxy clusters
Miller, E. D.; Nevalainen, J.; Kettula, K.
Aims: We extend a previous cross-calibration study conducted by the International Astronomical Consortium for High Energy Calibration (IACHEC) on XMM-Newton/EPIC, Chandra/ACIS and BeppoSAX/MECS X-ray instruments with galaxy clusters to Suzaku/XIS instruments. Our aim is to study the accuracy of the energy-dependent effective area calibration …