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Number counts of bright extremely red objects: Evolved massive galaxies at z ∼1
Väisänen, P.; Johansson, P. H.
We present results on number counts of Extremely Red Objects (EROs) in a 2850 arcmin2 near-infrared survey performed in European Large Area ISO Survey (ELAIS) fields at K<17.5. Counts of EROs are extended to brighter levels than available previously, giving 0.002 ± 0.001 arcmin-2 at K<16.5 and consistent numbers with li…
Discrete modes and turbulence in a wave-driven strongly magnetized plasma
Matthaeus, William H.; Lanzerotti, Louis J.; Dmitruk, Pablo
We show the coexistence of discrete modes and turbulence in numerical experiments of magnetohydrodynamics with a strong background magnetic field. The particular system we consider is a model of an open magnetic region which we have previously used in coronal heating studies. In the simulations shown here, Alfven waves at discrete frequencies with…
ISO far infrared observations of the high latitude cloud L 1642. I. The density and temperature structure
Juvela, M.; Lemke, D.; Russeil, D. +2 more
We have performed a large-scale mapping of the high-latitude, moderate extinction dark cloud L 1642 with ISO (Infrared Space Observatory) at 200 µm to study the properties of dust, the virial equilibrium condition of the cloud, and their relation to star formation. The cloud consists of three denser regions which are connected by diffuse mat…
Concerning the White Dwarf Cooling Age of M4: A Reply to De Marchi et al. on ``A Different Interpretation of Recent Deep HST Observations''
Stetson, P. B.; Rich, R. M.; Shara, M. +7 more
We respond to the recent paper by De Marchi et al. on the white dwarf cooling age of M4. The authors question the data analysis and interpretation that led to our conclusions in Hansen et al. in 2002. In their paper, De Marchi et al. are unable to obtain photometry as deep as ours from the same data set and therefore assert that only a lower limit…
A potential φ Per-type (Be+sdO) binary: FY CMa
Stahl, O.; Rivinius, Th.; Štefl, S. +2 more
The spectrum of the Be star FY CMa is shown to vary periodically with P=37.26±0.03 d. The types of variation, exhibiting transient strong shell phases and a radial-velocity variable He I emission component, suggest the star to be of the same type as φ Per, i.e. having an evolved hot companion ionizing the outer parts of the primary's circumstellar…
X-Rays from the Mira AB Binary System
Soker, Noam; Kastner, Joel H.
We present the results of XMM-Newton X-ray observations of the Mira AB binary system, which consists of a pulsating, asymptotic giant branch primary and nearby (~0.6" separation) secondary of uncertain nature. The European Photon Imaging Camera (EPIC) CCD (MOS and pn) X-ray spectra of Mira AB are relatively soft, peaking at ~1 keV, with only very …
Stagnated Outflow of O+5 Ions in the Source Region of the Slow Solar Wind at Solar Minimum
Chen, Y.; Strachan, L.; Hu, Y. +1 more
Using recent coordinated UVCS and LASCO measurements by Strachan and coworkers to constrain the heating parameters of a one-dimensional single-fluid minor ion model, we calculate the outflow velocity profile of O+5 ions in the flow tube overlying the helmet streamer, which has been supposed to be the source region of the slow solar wind…
A First XMM-Newton Look at the Relativistic Double Pulsar PSR J0737-3039
Bignami, G. F.; Tiengo, A.; Mereghetti, S. +5 more
We present the results of a 50 ks long X-ray observation of the relativistic double pulsar system PSR J0737-3039 obtained with the XMM-Newton satellite in 2004 March. The source has a soft spectrum (with a power-law photon index of 3.5+0.5-0.3 ) and a 0.2-10 keV luminosity of ~3×1030 ergs s-1 (assuming a…
The energetic NeUtral Atom Detector Unit (NUADU) for China's Double Star Mission and its calibration
Barabash, Stas; McKenna-Lawlor, Susan; Shen, Chao +11 more
An account is provided of an advanced Energetic NeUtral Atom Detector Unit (NUADU) designed for China's Double Star Mission. Special emphasis is given to describing the detector head of the instrument and its calibration.
J320 (PN G190.3-17.7) as a poly-polar planetary nebula surrounded by point-symmetric knots
López, J. A.; Meaburn, J.; Holloway, A. J. +2 more
Spatially resolved, long-slit spectra obtained with the Manchester echelle spectrometer of the planetary nebula J320 have been compared with Hubble Space Telescope and ground-based images. The morphology and kinematics of the nebular core have been convincingly modelled using the XSHAPE code.
Two and possibly three bipolar lobes, expanding at…