Search Publications
Missions
Journals
Publication Years
Irradiated and Bent Jets in the Orion Nebula
Smith, Nathan; Bally, John; Walawender, Josh +1 more
We present new images and proper-motion measurements of irradiated outflows from young stars in the outskirts of the Orion Nebula obtained with the Advanced Camera for Surveys onboard the Hubble Space Telescope. The images reveal many new outflows and new details in previously detected flows. The large-scale bipolar flows such as HH 502, 505, 874,…
Amorphous alumina in the extended atmosphere of α Orionis
Waters, L. B. F. M.; Eriksson, K.; Hony, S. +7 more
In this paper we study the extended atmosphere of the late-type supergiant α Orionis. Infrared spectroscopy of red supergiants reveals strong molecular bands, some of which do not originate in the photosphere but in a cooler layer of molecular material above it. Lately, these layers have been spatially resolved by near and mid-IR interferometry. I…
Venus-solar wind interaction: Asymmetries and the escape of O+ ions
Kallio, E.; Janhunen, P.; Jarvinen, R.
We study the interaction between Venus and the solar wind using a global three-dimensional self-consistent quasi-neutral hybrid (QNH) model. The model treats ions (H+,O+) as particles and electrons as a massless charge neutralizing fluid. In the analysed Parker spiral interplanetary magnetic field (IMF) case (IMF=[8.09,5.88,0…
COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. II. SDSS J0924+0219: the redshift of the lensing galaxy, the quasar spectral variability and the Einstein rings
Magain, P.; Dye, S.; Meylan, G. +4 more
Aims.To provide the observational constraints required to use the gravitationally lensed quasar SDSS J0924+0219 for the determination of H0 from the time delay method. We measure here the redshift of the lensing galaxy, we show the spectral variability of the source, and we resolve the lensed host galaxy of the source.
Methods.We pr…
The Hard X-Ray 20-40 keV AGN Luminosity Function
Gehrels, N.; Shrader, C. R.; Produit, N. +2 more
We have compiled a complete extragalactic sample based on ~25,000 deg2 to a limiting flux of 3×10-11 ergs cm-2 s-1 (~7000 deg2 to a flux limit of 10-11 ergs cm-2 s-1) in the 20-40 keV band with INTEGRAL. We have constructed a detailed exposure map to compensate…
A variable Quasi-Periodic Oscillation in M82 X-1. Timing and spectral analysis of XMM-Newton and RossiXTE observations
Belloni, T.; Ranalli, P.; Casella, P. +2 more
We report results from a spectral and timing analysis of M82 X-1, one of the brightest known ultraluminous X-ray sources. Data from a new 105-ks XMM-Newton observation of M82 X-1, performed in 2004 April, and of archival RossiXTE observations are presented. A very soft thermal component is present in the XMM spectrum. Although it is not possible t…
Resolving the compact dusty discs around binary post-AGB stars using N-band interferometry
Waters, L. B. F. M.; Jaffe, W.; Paresce, F. +8 more
We present the first mid-IR long baseline interferometric observations of the circumstellar matter around binary post-AGB stars. Two objects,
A general model for the identification of specific PAHs in the far-IR
Joblin, C.; Toublanc, D.; Mulas, G. +1 more
Context: .In the framework of the interstellar PAH hypothesis, far-IR skeletal bands are expected to be a fingerprint of single species in this class.
Aims: .A detailed model of the photo-physics of interstellar PAHs is required for such single-molecule identification of their far-IR features in the presently available Infrared Space Observato…
Hot Populations in M87 Globular Clusters
Kundu, Arunav; Frogel, Jay A.; O'Connell, Robert W. +5 more
To explore the production of UV-bright stars in old, metal-rich populations like those in elliptical galaxies, we have obtained Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph far- and near-UV photometry of globular clusters (GCs) in four fields in the giant elliptical (gE) galaxy M87. To a limit of mFUV~25 we detect a…
Analysis of Magnetic Shear in An X17 Solar Flare on October 28, 2003
Golub, L.; Su, Y. N.; Gros, M. +1 more
An X17 class (GOES soft X-ray) two-ribbon solar flare on October 28, 2003 is analyzed in order to determine the relationship between the timing of the impulsive phase of the flare and the magnetic shear change in the flaring region. EUV observations made by the Transition Region and Coronal Explorer (TRACE) show a clear decrease in the shear of th…