Search Publications
The Asteroid Catalog Using AKARI IRC Slow-Scan Observations
Hasegawa, Sunao; Takita, Satoshi; Usui, Fumihiko +2 more
We present an asteroidal catalog from the mid-infrared wavelength region using the slow-scan observation mode obtained by the Infrared Camera (IRC) on-board the Japanese infrared satellite AKARI. An archive of IRC slow-scan observations comprising about 1000 images was used to search for serendipitous encounters of known asteroids. We have determi…
ALMA Observations of the Coldest Place in the Universe: The Boomerang Nebula
Sahai, R.; Huggins, P. J.; Vlemmings, W. H. T. +2 more
The Boomerang Nebula is the coldest known object in the universe, and an extreme member of the class of pre-planetary nebulae, objects which represent a short-lived transitional phase between the asymptotic giant branch and planetary nebula evolutionary stages. Previous single-dish CO (J = 1-0) observations (with a 45'' beam) showed that the high-…
Ray tracing of whistler-mode chorus elements: implications for generation mechanisms of rising and falling tone emissions
Nunn, D.; Omura, Y.; Yamaguchi, K. +1 more
Using a well-established magnetospheric very-low-frequency (VLF) ray tracing method, in this work we trace the propagation of individual rising- and falling-frequency elements of VLF chorus from their generation point in the equatorial region of the magnetosphere through to at least one reflection at the lower-hybrid resonance point. Unlike recent…
Neutrino anisotropies after Planck
Di Valentino, Eleonora; Gerbino, Martina; Said, Najla
We present new constraints on the rest-frame sound speed, ceff2, and the viscosity parameter, cvis2, of the cosmic neutrino background from the recent measurements of the cosmic microwave background anisotropies provided by the Planck satellite. While broadly consistent with the expectations of ceff…
Analysis of Spitzer-IRS spectra of hyperluminous infrared galaxies
Carrera, F. J.; Nardini, E.; Panessa, F. +2 more
Context. Hyperluminous infrared galaxies (HLIRG) are the most luminous persistent objects in the Universe. They exhibit extremely high star formation rates, and most of them seem to harbour an active galactic nucleus (AGN). They are unique laboratories for investigating the most extreme star formation and its connection to super-massive black hole…
X-Ray and Optical Monitoring of a Gamma-Ray-Emitting Radio Galaxy, NGC 1275
Fukazawa, Yasushi; Yamazaki, Syoko; Sasada, Mahito +7 more
We performed monitoring observations of a gamma-ray-emitting radio galaxy, NGC 1275, in the X-ray and optical bands with the Suzaku/XIS, Kanata telescope, and the Okayama telescope. The X-ray flux of the nucleus was estimated by imaging spectroscopy in the hard X-ray band. In the optical band, a continuum flux, a broad Hα line flux, and the polari…
Decoupling absorption and continuum variability in the Seyfert 2 NGC 4507
Ptak, A.; Turner, T. J.; Ballo, L. +3 more
We present the results of the Suzaku observation of the Seyfert 2 galaxy NGC 4507. This source is one of the X-ray brightest Compton-thin Seyfert 2s and a candidate for a variable absorber. Suzaku caught NGC 4507 in a highly absorbed state characterized by a high column density (NH ∼ 8 × 1023 cm-2), a strong reflec…
Detailed Investigations of the Dimmest Bursts from Two Magnetars, SGR J0501+4516 and SGR J1550-5418
Kouveliotou, Chryssa; Göǧüş, Ersin; Lin, Lin +1 more
We applied the Bayesian blocks representation technique to search for the dimmest bursts from two magnetars: we identified 320 events from SGR J0501+4516 using a deep XMM-Newton observation and 404 bursts from SGR J1550-5418 using two Swift/X-Ray Telescope pointings. The fluence level of our sample for both sources is about one to two orders of ma…
The Structure of Massive Quiescent Galaxies at Z ~ 3 in the CANDELS-COSMOS Field
Fang, Guanwen; Kong, Xu; Lin, Lin +5 more
In this Letter, we use a two-color (J - L) versus (V - J) selection criterion to search massive quiescent galaxy (QG) candidates at 2.5 <= z <= 4.0 in the CANDELS-COSMOS field. We construct an H F160W-selected catalog and complement it with public auxiliary data. We finally obtain 19 passive VJL-selected (hereafter pVJL) galaxies …
Cluster observations of hot flow anomalies with large flow deflections: 1. Velocity deflections
Zong, Qiugang; Zhang, Hui; Wang, Shan
Case and statistical studies have been performed to investigate hot flow anomalies (HFAs) with large flow deflections using data from the Cluster-C1 spacecraft from 2003 to 2009. We have selected 87 events with Vy or Vz in GSE coordinates larger than 200 km s-1. Observations of these HFAs indicate a "location-depen…