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Stellar mass estimates in early-type galaxies from lensing+dynamical and photometric measurements
Grillo, C.; Rosati, P.; Lombardi, M. +1 more
Aims:Our purpose is to compare two different diagnostics for estimating stellar masses in early-type galaxies and to establish their level of reliability. In particular, we consider the well-studied sample of 15 field elliptical galaxies selected from the Sloan Lens ACS (SLACS) Survey (z = 0.06-0.33). We examine here the correlation between the st…
A Simulation of a Coronal Mass Ejection Propagation and Shock Evolution in the Lower Solar Corona
Gombosi, T. I.; Cohen, O.; Opher, M. +2 more
We present a detailed simulation of the evolution of a moderately slow coronal mass ejection (CME; 800 km s-1 at 5 R⊙, where R⊙ is solar radii) in the lower solar corona (2-5 R⊙). The configuration of the Sun's magnetic field is based on the MDI data for the solar surface during Carrington rotation 1922.…
Magnetosphere ionosphere coupling during the CME events of 07 12 November 2004
Reme, H.; Walker, S.; Alleyne, H. +3 more
The response of the magnetosphere and ionosphere to the coronal mass ejection (CME) events during the period 07-12 November 2004 is studied using Cluster and ground-based (ESR, EISCAT and Jicamarca radars and magnetometer) observations. The coordinated observations provide a good example of the magnetosphere-ionosphere coupling through prompt pene…
Changing Characteristics of Jupiter's Little Red SPOT
Baines, K. H.; Pantin, E.; Stern, S. A. +12 more
The Little Red Spot (LRS) in Jupiter's atmosphere was investigated in unprecedented detail by the New Horizons spacecraft together with the Hubble Space Telescope (HST) and the Very Large Telescope (VLT). The LRS and the larger Great Red Spot (GRS) of Jupiter are the largest known atmospheric storms in the solar system. Originally a white oval, th…
The X-Ray Properties of Moderate-Redshift Galaxy Groups Selected by Association with Gravitational Lenses
McKean, J. P.; Auger, M. W.; Mulchaey, J. S. +5 more
We present results from a systematic investigation of the X-ray properties of a sample of moderate-redshift (0.3 < z < 0.6) galaxy groups. These groups were selected not by traditional X-ray or optical search methods, but rather by an association, either physical or along the line of sight, with a strong gravitational lens. We calculate the …
New laboratory measurements of CH 4 in Titan's conditions and a reanalysis of the DISR near-surface spectra at the Huygens landing site
Lellouch, E.; Bézard, B.; Coustenis, A. +5 more
Laboratory spectra of methane-nitrogen mixtures have been recorded in the near-infrared range (1.0-1.65 µm) in conditions similar to Titan's near surface, to facilitate the interpretation of the DISR/DLIS (DISR - Descent Imager/Spectral Radiometer) spectra taken during the last phase of the descent of the Huygens Probe, when the surface was …
Improved estimates of the physical properties of the O-star binary V1007 Sco = HD 152248 and notes on several other binaries in the NGC 6231 cluster
Wolf, M.; Morrell, N.; Harmanec, P. +4 more
Context: In spite of the importance of massive O-type stars for astrophysics, their accurate masses and other fundamental properties are still a matter of debate. Determining them reliably is hampered by various factors (stellar winds and other forms of circumstellar matter), and the agreement of derived properties with the model predictions is fa…
Far-Infrared Properties of Blue Compact Dwarf Galaxies Observed with AKARI/Far-Infrared Surveyor (FIS)
Onaka, Takashi; Kaneda, Hidehiro; Suzuki, Toyoaki +1 more
We report on the basic far-infrared (FIR) properties of eight blue compact dwarf galaxies (BCDs) observed by AKARI. We have measured the fluxes at the four FIS bands (wavelengths of 65 µm, 90 µm, 140 µm, and 160 µm). Based on these fluxes, we have estimated basic quantities of dust: dust temperature, dust mass, and total FI…
A Transient Black Hole Low-Mass X-Ray Binary Candidate in Centaurus A
Hardcastle, M. J.; Croston, J. H.; Birkinshaw, M. +14 more
We report the discovery of a bright transient X-ray source, CXOU J132518.2-430304, toward Centaurus A (Cen A) using six new Chandra X-Ray Observatory observations in 2007 March-May. Between 2003 and 2007, its flux has increased by a factor of >770. The source is likely a low-mass X-ray binary in Cen A with unabsorbed 0.3-10 keV band luminositie…
Wolf-Rayet stars in M33 - II. Optical spectroscopy of emission-line stars in giant HII regions
Drissen, Laurent; Úbeda, Leonardo; Crowther, Paul A. +1 more
We present optical spectra of 14 emission-line stars in M33's giant HII regions NGC 592,595 and 604: five of them are known Wolf-Rayet (WR) stars, for which we present a better quality spectrogram, eight are WR candidates based on narrow-band imagery and one is a serendipitous discovery. Spectroscopy confirms the power of interference filter image…