Search Publications
Diffuse X-Ray Emission from the Northern Arc of Loop I Observed with Suzaku
Nakashima, Shinya; Inoue, Yoshiyuki; Kataoka, Jun +4 more
After discovery of the Fermi bubbles, giant structures observed from radio to X-ray monitoring have been widely discussed as possible evidence of past activities in the Galactic center (GC). We report here on the analysis of all the Suzaku archival data pointing around the giant-scale Loop I arc. The diffuse X-ray emission from the northern Loop I…
Magnetic field analysis of the bow and terminal shock of the SS 433 jet
Nakanishi, Hiroyuki; Akamatsu, Hiroki; Akahori, Takuya +4 more
We report a polarization analysis of the eastern region of W 50, observed with the Australia Telescope Compact Array (ATCA) at 1.4-3.0 GHz. In order to study the physical structures in the region where the SS 433 jet and W 50 interact, we obtain an intrinsic magnetic field vector map of that region. We find that the orientation of the intrinsic ma…
Ratio of black hole to galaxy mass of an extremely red dust-obscured galaxy at z = 2.52
Marconi, A.; Iwasawa, K.; Wang, W. -H. +7 more
We present a near-infrared (NIR) spectrum of WISE J104222.11+164115.3, an extremely red dust-obscured galaxy (DOG), which has been observed with the Long-slit Intermediate Resolution Infrared Spectrograph (LIRIS) on the 4.2m William Hershel Telescope. This object was selected as a hyper-luminous DOG candidate at z ∼ 2 by combining the optical and …
Establishing the spectral turnover of blazar PKS 2155-304 as an outcome of radiative losses
Jeena, K.; Misra, R.; Ravikumar, C. D. +2 more
The broad-band optical/UV and X-ray spectra of blazars have been often modelled as synchrotron component arising from a broken power-law distribution of electrons. A broken power-law distribution is expected, since the high-energy electrons undergo radiative losses effectively. The change in the energy index should then be ≈1 and corresponds to a …
On the nature of the high-energy rollover in 1H 0419-577
Turner, T. J.; Reeves, J. N.; Braito, V. +1 more
A NuSTAR/Swift observation of the luminous Seyfert 1 galaxy 1H 0419-577 taken during 2015 reveals one of the most extreme high-energy cut-offs observed to date from an AGN - an origin due to thermal Comptonization would imply a remarkably low coronal temperature kT ∼ 15 keV. The low-energy peak of the spectrum in the hard X-ray NuSTAR band, which …
Quantifying the abundance of faint, low-redshift satellite galaxies in the COSMOS survey
Rhodes, Jason; Taylor, James E.; Koekemoer, Anton +3 more
Faint dwarf satellite galaxies are important as tracers of small-scale structure, but remain poorly characterized outside the Local Group, due to the difficulty of identifying them consistently at larger distances. We review a recently proposed method for estimating the average satellite population around a given sample of nearby bright galaxies, …
SPIRITS 16tn in NGC 3556: A Heavily Obscured and Low-luminosity Supernova at 8.8 Mpc
Van Dyk, Schuyler D.; Smith, Nathan; Gehrz, Robert D. +17 more
We present the discovery by the SPitzer InfraRed Intensive Transients Survey (SPIRITS) of a likely supernova (SN) in NGC 3556 (M108) at only 8.8 Mpc that was not detected by optical searches. A luminous infrared (IR) transient at M [4.5] = -16.7 mag (Vega), SPIRITS 16tn is coincident with a dust lane in the inclined, star-forming disk o…
Multiwavelength study of X-ray luminous clusters in the Hyper Suprime-Cam Subaru Strategic Program S16A field
Hoshino, Akio; Fukazawa, Yasushi; Nakazawa, Kazuhiro +34 more
We present a joint X-ray, optical, and weak-lensing analysis for X-ray luminous galaxy clusters selected from the MCXC (Meta-Catalog of X-Ray Detected Clusters of Galaxies) cluster catalog in the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) survey field with S16A data. As a pilot study for a series of papers, we measure hydrostatic equilib…
Chromospheric counterparts of solar transition region unresolved fine structure loops
De Pontieu, Bart; Hansteen, Viggo H.; Rouppe van der Voort, Luc +1 more
Low-lying loops have been discovered at the solar limb in transition region temperatures by the Interface Region Imaging Spectrograph (IRIS). They do not appear to reach coronal temperatures, and it has been suggested that they are the long-predicted unresolved fine structures (UFS). These loops are dynamic and believed to be visible during both h…
Stability of condensed fuzzy dark matter halos
Eby, Joshua; Leembruggen, Madelyn; Suranyi, Peter +1 more
Stability properties of gravitationally bound condensates composed of ultralight axionic Fuzzy Dark Matter (FDM) are studied. Previous work has shown that astrophysical collisions could make self-gravitating condensates structurally unstable, making them prone to collapse and decay; in the context of FDM, we reexamine the relevant timescales using…