Search Publications
Dwarf Irregular Galaxy Leo A: Suprime-Cam Wide-field Stellar Photometry
Tamura, Naoyuki; Arimoto, Nobuo; Stonkutė, Rima +3 more
We have surveyed a complete extent of Leo A—an apparently isolated gas-rich low-mass dwarf irregular galaxy in the Local Group. The B, V, and I passband CCD images (typical seeing ~0.''8) were obtained with the Subaru Telescope equipped with the Suprime-Cam mosaic camera. The wide-field (20' × 24') photometry catalog of 38,856 objects (V ~ 16-26 m…
Analytical Solution for Waves in Planets with Atmospheric Superrotation. I. Acoustic and Inertia-Gravity Waves
López-Valverde, M. A.; Imamura, T.; Peralta, J. +3 more
This paper is the first of a two-part study devoted to developing tools for a systematic classification of the wide variety of atmospheric waves expected on slowly rotating planets with atmospheric superrotation. Starting with the primitive equations for a cyclostrophic regime, we have deduced the analytical solution for the possible waves, simult…
Herschel Key Program, "Dust, Ice, and Gas In Time" (DIGIT): The Origin of Molecular and Atomic Emission in Low-mass Protostars in Taurus
Lee, Jeong-Eun; Lee, Jinhee; Green, Joel D. +2 more
Six low-mass embedded sources (L1489, L1551-IRS5, TMR1, TMC1-A, L1527, and TMC1) in Taurus have been observed with Herschel-PACS to cover the full spectrum from 50 to 210 µm as part of the Herschel key program, "Dust, Ice, and Gas In Time." The relatively low intensity of the interstellar radiation field surrounding Taurus minimizes contamin…
Optical-faint, Far-infrared-bright Herschel Sources in the CANDELS Fields: Ultra-luminous Infrared Galaxies at z > 1 and the Effect of Source Blending
Pérez-González, Pablo G.; Grogin, Norman A.; Koekemoer, Anton M. +13 more
The Herschel very wide field surveys have charted hundreds of square degrees in multiple far-IR (FIR) bands. While the Sloan Digital Sky Survey (SDSS) is currently the best resource for optical counterpart identifications over such wide areas, it does not detect a large number of Herschel FIR sources and leaves their nature undetermined. As a test…
Chasing the Identification of ASCA Galactic Objects (ChIcAGO): An X-Ray Survey of Unidentified Sources in the Galactic Plane. I. Source Sample and Initial Results
Drake, Jeremy J.; Chakrabarty, Deepto; Lee, Julia C. +18 more
We present the Chasing the Identification of ASCA Galactic Objects (ChIcAGO) survey, which is designed to identify the unknown X-ray sources discovered during the ASCA Galactic Plane Survey (AGPS). Little is known about most of the AGPS sources, especially those that emit primarily in hard X-rays (2-10 keV) within the Fx ~ 10-13
K-shell Photoabsorption of Magnesium Ions
García, J.; Kallman, T. R.; Gatuzz, E. +4 more
X-ray photoabsorption cross sections have been computed for all magnesium ions with three or more electrons using the R-matrix method. A comparison with other available data for Mg II-Mg X shows good qualitative agreement in the resultant resonance shapes. However, for the lower ionization stages, and for singly ionized Mg II in particular, the pr…
Infrared Spectra of Acetylene Diluted in Solid Nitrogen upon Irradiation with Vacuum Ultraviolet Light and Electrons
Chen, Sian-Cong; Huang, Tzu-Ping; Wu, Yu-Jong +1 more
Infrared spectra and chemical reactions of acetylene diluted in solid nitrogen at 10 K upon irradiation with vacuum ultraviolet (VUV) light and energetic electrons were investigated in separate experiments. Irradiation of the matrix sample with VUV light peaking at 160 and 121.6 nm yielded simple products, including C2H, CN, and isomers…
Herschel and Spitzer Observations of Slowly Rotating, Nearby Isolated Neutron Stars
Pavlov, G. G.; Wachter, S.; Posselt, B. +1 more
Supernova fallback disks around neutron stars have been suspected to influence the evolution of the diverse neutron star populations. Slowly rotating neutron stars are the most promising places to find such disks. Searching for the cold and warm debris of old fallback disks, we carried out Herschel PACS (70 µm, 160 µm) and Spitzer IRAC…
A Photon-dominated Region Model for the FIR Mid-J CO Ladder with Universal Rotational Temperature in Star Forming Regions
Lee, Jeong-Eun; Bergin, Edwin A.; Lee, Seokho +1 more
A photon-dominated region (PDR) is one of the leading candidate mechanisms for the origin of warm CO gas with near universal ~300 K rotational temperature inferred from the CO emission detected toward embedded protostars by Herschel/PACS. We have developed a PDR model in general coordinates, where we can use the most adequate coordinate system for…
Observed Relationship between CO 2-1 and Dust Emission during the Post-asymptotic-giant-branch Phase
Szczerba, R.; He, J. H.; Schmidt, M. R. +1 more
A CO 2-1 line survey is performed toward a sample of 58 high Galactic latitude post-asymptotic-giant-branch (pAGB) stars. To complement the observations, a compilation of literature CO 2-1 line data of known pAGB stars is done. After combining the data sets, CO 2-1 line data are available for 133 pAGB stars (about 34% of known pAGB stars) among wh…