Search Publications
A Comparison of Broad Iron Emission Lines in Archival Data of Neutron Star Low-mass X-Ray Binaries
Reis, Rubens C.; Fabian, Andrew C.; Miller, Jon M. +2 more
Relativistic X-ray disklines have been found in multiple neutron star low-mass X-ray binaries, in close analogy with black holes across the mass scale. These lines have tremendous diagnostic power and have been used to constrain stellar radii and magnetic fields, often finding values that are consistent with independent timing techniques. Here, we…
HerMES: A Statistical Measurement of the Redshift Distribution of Herschel-SPIRE Sources Using the Cross-correlation Technique
Scott, D.; Béthermin, M.; Wang, L. +19 more
The wide-area imaging surveys with the Herschel Space Observatory at submillimeter (sub-mm) wavelengths have now resulted in catalogs of the order of one-hundred-thousand dusty, starburst galaxies. These galaxies capture an important phase of galaxy formation and evolution, but, unfortunately, the redshift distribution of these galaxies, N(z), is …
Transiting exoplanets from the CoRoT space mission. XXIII. CoRoT-21b: a doomed large Jupiter around a faint subgiant star
Mazeh, T.; Aigrain, S.; Alonso, R. +45 more
CoRoT-21, a F8IV star of magnitude V = 16 mag, was observed by the space telescope CoRoT during the Long Run 01 (LRa01) in the first winter field (constellation Monoceros) from October 2007 to March 2008. Transits were discovered during the light curve processing. Radial velocity follow-up observations, however, were performed mainly by the 10-m K…
An Unexpected Discovery in the Rich Open Cluster NGC 6819 Using XMM-Newton
Ramirez-Ruiz, Enrico; Pooley, David; Kalirai, Jason +4 more
We present the first study of the X-ray population of the intermediate-age rich open cluster NGC 6819 using the XMM-Newton Observatory. In the past decade, Chandra X-ray observations have shown a relationship between the X-ray population of globular clusters and their internal dynamics and encounter frequency. We investigate the role dynamics poss…
Spectrally resolved C II emission in M 33 (HerM33es). Physical conditions and kinematics around BCLMP 691
Boquien, M.; Braine, J.; van der Werf, P. +7 more
This work presents high spectral resolution observations of the [C ii] line at 158 µm, one of the major cooling lines of the interstellar medium, taken with the HIFI heterodyne spectrometer on the Herschel satellite. In BCLMP 691, an H ii region far north (3.3 kpc) in the disk of M 33, the [C ii] and CO line profiles show similar velocities …
Whistler anisotropy instability with a cold electron component: Linear theory
Gary, S. Peter; Liu, Kaijun; Denton, Richard E. +1 more
The whistler anisotropy instability is driven by an electron temperature anisotropy T⊥/T∥ > 1 where ⊥ and ∥ denote directions perpendicular and parallel, respectively, to the background magnetic field Bo. Here kinetic linear theory in a magnetized, homogeneous, collisionless plasma model is used to study this in…
Shocked and Scorched: The Tail of a Tadpole in an Interstellar Pond
Sahai, R.; Morris, M. R.; Claussen, M. J.
We report multi-wavelength observations of the far-infrared source IRAS 20324+4057, including high-resolution optical imaging with the Hubble Space Telescope, and ground-based near-infrared, millimeter-wave and radio observations. These data show an extended, limb-brightened, tadpole-shaped nebula with a bright, compact, cometary nebula located in…
Coronal Density Structures and CMEs: Superior Solar Conjunctions of Mars Express, Venus Express, and Rosetta: 2004, 2006, and 2008
Tellmann, Silvia; Tyler, G. Leonard; Tsurutani, Bruce T. +5 more
Coronal radio-sounding experiments were carried out using the S-band (2.3 GHz) and X-band (8.4 GHz) signals of the ESA Mars Express, Venus Express, and Rosetta spacecraft during five superior conjunctions occurring in 2004, 2006 (3×), and 2008/2009. Differential frequency and propagation delay (ranging) observations were recorded during these oppo…
The Central Region of the Barred Spiral Galaxy NGC 1097 Probed by AKARI Near-infrared Spectroscopy
Oyabu, Shinki; Onaka, Takashi; Yamagishi, Mitsuyoshi +6 more
With the Infrared Camera on board AKARI, we carried out near-infrared (2.5-5.0 µm) spectroscopy of the central kiloparsec region of the barred spiral galaxy, NGC 1097, categorized as Seyfert 1 with a circumnuclear starburst ring. Our observations mapped the area of ~50'' × 10'' with the resolution of ~5'', covering about a half of the ring a…
The orientation of Titan's dayside ionosphere and its effects on Titan's plasma interaction
Brecht, Stephen H.; Ledvina, Stephen A.; Cravens, Thomas E.
A hybrid particle code has been used to examine how Titan's interaction with Saturn's magnetosphere is effected by the orientation of the dayside ionosphere with respect to the incident magnetospheric flow. The hybrid code self-consistently includes a version of Titan's ionosphere represented by 7 generic ion species, over 40 ionneutral chemical r…