Search Publications
Dynamical Masses in Luminous Infrared Galaxies
Rieke, G. H.; Hinz, J. L.
We have studied the dynamics and masses of a sample of 10 nearby luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs, respectively) using 2.3 µm 12CO-absorption line spectroscopy and near-infrared H- and Ks-band imaging. By combining velocity dispersions derived from the spectroscopy, disk scale lengths obtai…
The Low-Mass Pre-Main-Sequence Population of the Stellar Association LH 52 in the Large Magellanic Cloud Discovered with Hubble Space Telescope WFPC2 Observations
Henning, Th.; Brandner, W.; Gouliermis, D.
We report on the serendipitous discovery of ~500 low-mass candidate pre-main-sequence (PMS) stars in the vicinity of the stellar association LH 52 in the Large Magellanic Cloud. We present evidence that the red faint sequence of these stars seen in the CMD of LH 52 from Hubble Space Telescope (HST) WFPC2 observations belongs only to the associatio…
Solar Wind Electric Fields in the Ion Cyclotron Frequency Range
Bale, S. D.; Horbury, T. S.; Reme, H. +2 more
Measurements of fluctuations of electric fields in the frequency range from a fraction of 1 to 12.5 Hz are presented and corrected for the Lorentz transformation of magnetic fluctuations to give the electric fields in the plasma frame. The electric fields are large enough to provide the dominant force on the ions of the solar wind in the region ne…
The Influence of Magnetic Field on Oscillations in the Solar Chromosphere
Mathioudakis, Mihalis; Bloomfield, D. Shaun; McAteer, R. T. James +1 more
Two sequences of solar images obtained by the Transition Region and Coronal Explorer in three UV passbands are studied using wavelet and Fourier analysis and compared to the photospheric magnetic flux measured by the Michelson Doppler Interferometer on the Solar Heliospheric Observatory to study wave behavior in differing magnetic environments. Wa…
Far-Infrared Excited Hydroxyl Lines from Orion KL Outflows
Cernicharo, José; Viti, Serena; Barlow, Michael J. +6 more
As part of the first far-IR line survey toward Orion KL, we present the detection of seven new rotationally excited OH Λ-doublets (at ~48, ~65, ~71, ~79, ~98, and ~115 µm). Observations were performed with the Long Wavelength Spectrometer Fabry-Pérot on board the Infrared Space Observatory. In total, more than 20 resolved OH rotational lines…
Discovery of a Candidate Central Compact Object in the Galactic Nonthermal SNR G330.2+1.0
Pavlov, George G.; Kargaltsev, Oleg; Hughes, John P. +5 more
We report on the discovery of a pointlike source (CXOU J160103.1-513353) at the center of the Galactic supernova remnant (SNR) G330.2+1.0 with Chandra X-Ray Observatory. The X-ray spectrum fits a blackbody model with kT~0.49 keV, implying a small emission region of R~0.4 km at the distance of 5 kpc. The estimated X-ray luminosity is LX~…
The XMM-Newton Examination of Energetics in the East Lobe of the Nearby Radio Galaxy Fornax A (NGC 1316)
Isobe, N.; Makishima, K.; Tashiro, M. +4 more
An XMM-Newton observation of the east radio lobe of the nearby radio galaxy Fornax A is reported. The diffuse hard X-ray emission associated with the east lobe, which was initially discovered by ASCA and ROSAT, is confirmed with significant signal statistics, after strictly removing 59 sources detected within the MOS field of view. Its X-ray spect…
INTEGRAL IBIS Census of the Sky Beyond 100 keV
Walter, R.; Bird, A. J.; Fiocchi, M. +8 more
We report on the first census of INTEGRAL IBIS detections (>~4 σ significance) above 100 keV based on the Core Program and public open-time observations up to 2005 April. There are 49 sources detected in the 100-150 keV band, of which 14 are also seen in the 150-300 keV range. The low-energy sample is dominated by X-ray binary systems of both l…
Unravelling Temporal Variability in Saturn's Spiral Density Waves: Results and Predictions
Nicholson, Philip D.; Porco, Carolyn C.; Hedman, Matthew M. +2 more
We describe a model that accounts for the complex morphology of spiral density waves raised in Saturn's rings by the co-orbital satellites, Janus and Epimetheus. Our model may be corroborated by future Cassini observations of these time-variable wave patterns.
Probing the Pulsar Wind Nebula of PSR B0355+54
Cropper, M.; McGowan, K. E.; Kennea, J. A. +3 more
We present XMM-Newton and Chandra X-ray observations of the middle-aged radio pulsar PSR B0355+54. Our X-ray observations reveal emission not only from the pulsar itself, but also from a compact diffuse component extending ~50" in the opposite direction to the pulsar's proper motion. There is also evidence for the presence of fainter diffuse emiss…