Search Publications
Case Study of Four Homologous Large-scale Coronal Waves Observed on 2010 April 28 and 29
Temmer, M.; Nitta, N.; Veronig, A. M. +3 more
On 2010 April 28 and 29, the Solar TErrestrial Relations Observatory B/Extreme Ultraviolet Imager observed four homologous large-scale coronal waves, the so-called EIT-waves, within 8 hr. All waves emerged from the same source active region, were accompanied by weak flares and faint coronal mass ejections, and propagated into the same direction at…
Suzaku View of the Swift/BAT Active Galactic Nuclei. III. Application of Numerical Torus Models to Two Nearly Compton Thick Active Galactic Nuclei (NGC 612 and NGC 3081)
Aird, James; Ueda, Yoshihiro; Awaki, Hisamitsu +3 more
The broadband spectra of two Swift/BAT active galactic nuclei (AGNs) obtained from Suzaku follow-up observations are studied: NGC 612 and NGC 3081. Fitting with standard models, we find that both sources show similar spectra characterized by heavy absorption with N H ~= 1024 cm-2, and the fraction of scattered ligh…
Precise Estimates of the Physical Parameters for the Exoplanet System HD 17156 Enabled by Hubble Space Telescope Fine Guidance Sensor Transit and Asteroseismic Observations
Nelan, Edmund P.; Gilliland, Ronald L.; Christensen-Dalsgaard, Jørgen +6 more
We present observations of three distinct transits of HD 17156b obtained with the Fine Guidance Sensors on board the Hubble Space Telescope. We analyzed both the transit photometry and previously published radial velocities to find the planet-star radius ratio Rp /R sstarf = 0.07454 ± 0.00035, inclination i = 86.49+0.24<…
Molecular Gas Evolution Across a Spiral Arm in M51
Scoville, Nick; Koda, Jin; Egusa, Fumi
We present sensitive and high angular resolution CO(1-0) data obtained by the Combined Array for Research in Millimeter-wave Astronomy observations toward the nearby grand-design spiral galaxy M51. The angular resolution of 0farcs7 corresponds to 30 pc, which is similar to the typical size of giant molecular clouds (GMCs), and the sensitivity is a…
The Infrared Continuum Sizes of Be Star Disks
Gies, D. R.; Schaefer, G. H.; Touhami, Y.
We present an analysis of the near-infrared continuum emission from the circumstellar gas disks of Be stars using a radiative transfer code for a parameterized version of the viscous decretion disk model. This isothermal gas model creates predicted images that we use to estimate the half-width at half-maximum emission radius along the major axis o…
The Stability of Low Surface Brightness Disks Based on Multi-wavelength Modeling
Gallagher, J. S.; Wood, K.; Matthews, L. D. +1 more
To investigate the structure and composition of the dusty interstellar medium (ISM) of low surface brightness (LSB) disk galaxies, we have used multi-wavelength photometry to construct spectral energy distributions for three low-mass, edge-on LSB galaxies (V rot = 88-105 km s-1). We use Monte Carlo radiation transfer codes th…
Dust and Chemical Abundances of the Sagittarius Dwarf Galaxy Planetary Nebula Hen2-436
Izumiura, Hideyuki; Meixner, Margaret; Otsuka, Masaaki +3 more
We have estimated elemental abundances of the planetary nebula (PN) Hen2-436 in the Sagittarius (Sgr) spheroidal dwarf galaxy using ESO/VLT FORS2, Magellan/MMIRS, and Spitzer/IRS spectra. We have detected candidates of fluorine [F II] λ4790, krypton [Kr III] λ6826, and phosphorus [P II] λ7875 lines and successfully estimated the abundances of thes…
Obscured Starburst Activity in High-redshift Clusters and Groups
Kocevski, Dale D.; McGrath, Elizabeth J.; Fassnacht, Christopher D. +6 more
Using Spitzer-Multiband Imaging Photometer 24 µm imaging and extensive Keck spectroscopy, we examine the nature of the obscured star-forming population in three clusters and three groups at z ~ 0.9. These six systems are the primary components of the Cl1604 supercluster, the largest structure imaged by Spitzer at redshifts approaching unity.…
The Black Hole Mass in the Brightest Cluster Galaxy NGC 6086
Ma, Chung-Pei; Graham, James R.; Gebhardt, Karl +4 more
We present the first direct measurement of the central black hole mass, M •, in NGC 6086, the Brightest Cluster Galaxy (BCG) in A2162. Our investigation demonstrates for the first time that stellar-dynamical measurements of M • in BCGs are possible beyond the nearest few galaxy clusters. We observed NGC 6086 with laser guide …
Molecular CO(1-0) Gas in the z ~ 2 Radio Galaxy MRC 0152-209
Villar-Martín, M.; Morganti, R.; Ekers, R. D. +12 more
We report the detection of molecular CO(1-0) gas in the high-z radio galaxy MRC 0152-209 (z = 1.92) with the Australia Telescope Compact Array Broadband Backend (ATCA/CABB). This is the third known detection of CO(1-0) in a high-z radio galaxy to date. CO(1-0) is the most robust tracer of the overall molecular gas content (including the widespread…