Search Publications
On the massive star content of the nearby dwarf irregular Wolf-Rayet galaxy IC 4662
Crowther, P. A.; Bibby, J. L.
Aims: We investigate the massive stellar content of the nearby dwarf irregular Wolf-Rayet galaxy IC 4662, and consider its global star forming properties in the context of other metal-poor galaxies, namely the SMC, IC 10 and NGC 1569.
Methods: Very Large Telescope/FORS2 imaging and spectroscopy plus archival Hubble Space Telescope/ACS imaging …
Bursting behavior of the Galactic center faint X-ray transient GRS 1741.9-2853
Grosso, N.; Porquet, D.; Bozzo, E. +6 more
Aims: The neutron star low-mass X-ray binary GRS 1741.9-2853 is a known type-I burster at the Galactic center. It is transient, faint, and located in a very crowded region, only 10' from the supermassive black hole Sgr A^star. Therefore, its bursting behavior has been poorly studied so far. In particular, its persistent emission has rarely been de…
Abundance Inhomogeneity in the Northern Rim of the Cygnus Loop
Katsuda, Satoru; Uchida, Hiroyuki; Tsunemi, Hiroshi +3 more
We observed the northern rim of the Cygnus Loop with the Suzaku observatory in 5 pointings (P21-P25). From a spatially resolved analysis, all of the spectra were well fitted by a single component of the non-equilibrium ionization plasma model. From the best-fit parameters, we found that the abundances of the heavy elements are significantly lower …
Helioseismic Signature of Chromospheric Downflows in Acoustic Travel-Time Measurements From Hinode
Zhao, Junwei; Kosovichev, Alexander G.; Tarbell, Theodore D. +2 more
We report on a signature of chromospheric downflows in two emerging flux regions detected by time-distance helioseismology analysis. We use both chromospheric intensity oscillation data in the Ca II H line and photospheric Dopplergrams in the Fe I 557.6 nm line obtained by Hinode/SOT for our analyses. By cross-correlating the Ca II oscillation sig…
Global observations of substorm injection region evolution: 27 August 2001
Cully, C.; Donovan, E.; Blake, J. B. +7 more
We present riometer and in situ observations of a substorm electron injection on 27 August 2001. The event is seen at more than 20 separate locations (including ground stations and 6 satellites: Cluster, Polar, Chandra, and 3 Los Alamos National Laboratory (LANL) spacecraft). The injection is observed to be dispersionless at 12 of these locations.…
Serendipitous XMM-Newton Detection of X-Ray Emission from the Bipolar Planetary Nebula Hb 5
Frank, Adam; Balick, Bruce; Kastner, Joel H. +1 more
We report the serendipitous detection by the XMM-Newton X-ray Observatory of an X-ray source at the position of the Type I (He- and N-rich) bipolar planetary nebula (PN) Hb 5. The Hb 5 X-ray source appears marginally resolved. While the small number of total counts (~170) and significant off-axis angle of the X-ray source (~7farcm8) precludes a de…
Evaluation of a Selected Case of the Minimum Dissipative Rate Method for Non-Force-Free Solar Magnetic Field Extrapolations
Gary, G. Allen
The minimum dissipative rate (MDR) method for deriving a coronal non-force-free magnetic field solution is partially evaluated. These magnetic field solutions employ a combination of three linear (constant-α) force-free-field solutions with one being a potential field (i.e., α=0). The particular case of the solutions where the other two α's are of…
Is the 3.5 µm Infrared Feature on Enceladus Due to Hydrogen Peroxide?
Loeffler, M. J.; Baragiola, R. A.
We use new and previously published measurements from our laboratory to examine the assignment of a 3.5 µm feature in the infrared spectrum of Enceladus. The spectral feature, taken with Cassini's VIMS Spectrometer, has recently been interpreted as an absorption band from hydrogen peroxide on the surface. Such identification is important bec…
The total failures of GPS functioning caused by the powerful solar radio burst on December 13, 2006
Afraimovich, E. L.; Demyanov, V. V.; Smolkov, G. Ya.
We investigated failures in the GPS performance produced by extremely dense solar radio burst fluxes associated with the intense (X3.4 in GOES classification) solar flare and Halo CME recorded by SOHO/LASCO on December 13, 2006. According to substantial experimental evidence, high-precision GPS positioning on the entire sunlit side of the Earth wa…
The Nature of Growing Bulges Within z < 1.3 Galaxy Disks in the GOODS-N Field
Balcells, Marc; Domínguez-Palmero, Lilian
We analyze central surface brightness µ0, nuclear and global colors of intermediate redshift disk galaxies. On an apparent-diameter-limited sample of 398 galaxies from ACS/HST (Advanced Camera for Surveys in the Hubble Space Telescope) The Great Observatories Origins Deep Survey North (GOODS-N), we find 131 galaxies with bulges an…