Search Publications
Post-starburst Tidal Tails in the Archetypical Ultra Luminous Infrared Galaxy Arp 220
Murayama, T.; Taniguchi, Y.; Kajisawa, M. +6 more
We present our new deep optical imaging and long-slit spectroscopy for Arp 220, the archetypical ultra luminous infrared galaxy in the local universe. Our sensitive Hα imaging has newly revealed large-scale Hα absorption, i.e., post-starburst regions in this merger. One is found in the eastern superbubble and the other is in the two tidal tails th…
Unusual Carbonaceous Dust Distribution in PN G095.2+00.7
Onaka, Takashi; Matsuura, Mikako; Sakon, Itsuki +5 more
We investigate the polycyclic aromatic hydrocarbon (PAH) features in the young Galactic planetary nebula PN G095.2+00.7 based on mid-infrared observations. The near- to mid-infrared spectra obtained with the AKARI/IRC and the Spitzer/IRS show the PAH features as well as the broad emission feature at 12 µm usually seen in proto-planetary nebu…
Anomalous Anisotropic Cross-correlations between WMAP CMB Maps and SDSS Galaxy Distribution and Implications on the Dark Flow Scenario
Chen, Xuelei; Zhang, Pengjie; Li, Zhigang
We search for the dark flow induced diffuse kinetic Sunyaev-Zel'dovich (kSZ) effect through CMB-galaxy cross-correlation. Such angular correlation is anisotropic, with a unique cos (θDF) angular dependence, and hence can be distinguished from other components. Here, θDF is the angle between the opposite dark flow direction an…
A Precise Physical Orbit for the M-dwarf Binary Gliese 268
Queloz, D.; Ségransan, D.; Demory, B. -O. +11 more
We report high-precision interferometric and radial velocity (RV) observations of the M-dwarf binary Gl 268. Combining measurements conducted using the IOTA interferometer and the ELODIE and Harvard Center for Astrophysics RV instruments leads to a mass of 0.22596 ± 0.00084 M ⊙ for component A and 0.19230 ± 0.00071 M ⊙ for co…
Inverse Compton Scattering Model for X-Ray Emission of the Gamma-Ray Binary LS 5039
Yamaguchi, M. S.; Takahara, F.
We propose a model for the gamma-ray binary LS 5039 in which the X-ray emission is due to the inverse Compton (IC) process instead of the synchrotron radiation. Although the synchrotron model has been discussed in previous studies, it requires a strong magnetic field which leads to a severe suppression of the TeV gamma-ray flux in conflict with H.…
Mid-IR FORCAST/SOFIA Observations of M82
Gull, G. E.; Schoenwald, J.; Morris, M. R. +9 more
We present 75'' × 75'' size maps of M82 at 6.4 µm, 6.6 µm, 7.7 µm, 31.5 µm, and 37.1 µm with a resolution of ~4'' that we have obtained with the mid-IR camera FORCAST on SOFIA. We find strong emission from the inner 60'' (~1 kpc) along the major axis, with the main peak 5'' west-southwest of the nucleus and a secondar…
Four Decades of IRC +10216: Evolution of a Carbon-rich Dust Shell Resolved at 10 µm with MMT Adaptive Optics and MIRAC4
Marengo, Massimo; Hoffmann, William F.; Close, Laird M. +3 more
The evolved carbon-rich asymptotic giant branch star IRC +10216 (CW Leo) is the brightest mid-infrared source outside the solar system, as well as one of the closest examples of an evolved star losing mass. It has a complex and variable circumstellar structure on small scales in the near-infrared, and mid-infrared interferometry has revealed a dyn…
Hubble Space Telescope Pixel Analysis of the Interacting S0 Galaxy NGC 5195 (M51B)
Lee, Jong Chul; Kim, Minjin; Lee, Joon Hyeop +4 more
We report the properties of the interacting S0 galaxy NGC 5195 (M51B), revealed in a pixel analysis using the Hubble Space Telescope/Advanced Camera for Surveys images in the F435W, F555W, and F814W (BVI) bands. We analyze the pixel color-magnitude diagram (pCMD) of NGC 5195, focusing on the properties of its red and blue pixel sequences and the d…
Detection of X-Ray Periodicity from a New Eclipsing Polar Candidate XGPS-I J183251-100106
Hui, C. Y.; Lin, L. C. C.; Seo, K. A. +2 more
We report the results from a detailed analysis of an archival XMM-Newton observation of the X-ray source XGPS-I J183251-100106, which has been suggested as a promising magnetic cataclysmic variable (CV) candidate based on its optical properties. A single periodic signal of ~1.5 hr is detected from all EPIC instruments on board XMM-Newton. The phas…
Cloud and Haze in the Winter Polar Region of Titan Observed with Visual and Infrared Mapping Spectrometer on Board Cassini
Le Mouélic, S.; Sotin, C.; Brown, R. H. +1 more
A large cloud in the north polar region of Titan was first observed by the Visual and Infrared Mapping Spectrometer (VIMS) in 2005 and then in 2006. This cloud, confined beyond the latitude 62°N, is surrounded by a mixture of aerosol and mist probably lying in the low stratosphere and troposphere. Subsequent images of this region of Titan show a g…