Search Publications
Measure the Propagation of a Halo CME and Its Driven Shock with the Observations from a Single Perspective at Earth
Feng, Li; Lu, Lei; Inhester, Bernd +2 more
We present a detailed study of an Earth-directed coronal mass ejection (full-halo CME) event that happened on 2011 February 15, making use of white-light observations by three coronagraphs and radio observations by Wind/WAVES. We applied three different methods to reconstruct the propagation direction and traveling distance of the CME and its driv…
Simulation of magnetic holes formation in the magnetosheath
Raeder, Joachim; Ahmadi, Narges; Germaschewski, Kai
Magnetic holes have been frequently observed in the Earth's magnetosheath and are believed to be the consequence of the nonlinear evolution of the mirror instability. Mirror mode perturbations mainly form as magnetic holes in regions where the plasma is marginally mirror stable with respect to the linear instability criterion. We present an expand…
Suzaku spectroscopy of the neutron star transient 4U 1608-52 during its outburst decay.
Armas Padilla, M.; Muñoz-Darias, T.; Hori, T. +2 more
We test the proposed three-component spectral model for neutron star low-mass X-ray binaries using broad-band X-ray data. We have analysed four X-ray spectra (0.8-30 keV) obtained with Suzaku during the 2010 outburst of 4U 1608-52, which have allowed us to perform a comprehensive spectral study covering all the classical spectral states. We use a …
Kinematics of the galaxy from OB stars with proper motions from the Gaia DR1 catalogue
Bobylev, V. V.; Bajkova, A. T.
We consider two samples of OB stars with different distance scales that we have studied previously. The first and second samples consist of massive spectroscopic binaries with photometric distances and distances determined from interstellar calcium lines, respectively. The OB stars are located at heliocentric distances up to 7 kpc. We have identif…
A systematic search for near-infrared counterparts of nearby ultraluminous X-ray sources (II)
Harrison, F. A.; Roberts, T. P.; Torres, M. A. P. +5 more
We present the results of our continued systematic search for near-infrared (NIR) candidate counterparts to ultraluminous X-ray sources (ULXs) within 10 Mpc. We observed 42 ULXs in 24 nearby galaxies and detected NIR candidate counterparts to 15 ULXs. Fourteen of these ULXs appear to have a single candidate counterpart in our images and the remain…
Suzaku observations of the outskirts of the galaxy cluster Abell 3395, including a filament toward Abell 3391
Ohashi, Takaya; Takizawa, Motokazu; Fujita, Yutaka +4 more
The results of Suzaku observations of the outskirts of Abell 3395, including a large-scale structure filament toward Abell 3391, are presented. We measured temperature and abundance distributions from the southern outskirt of A 3395 to the north at the virial radius, where a filament structure has been found in the former X-ray and Sunyaev-Zel'dov…
Line-of-sight extrapolation noise in dust polarization
Dodelson, Scott; Poh, Jason
The B-modes of polarization at frequencies ranging from 50-1000 GHz are produced by Galactic dust, lensing of primordial E-modes in the cosmic microwave background (CMB) by intervening large scale structure, and possibly by primordial B-modes in the CMB imprinted by gravitational waves produced during inflation. The conventional method used to sep…
Searching for intermediate-mass black holes in galaxies with low-luminosity AGN: a multiple-method approach
Ciambur, Bogdan C.; Graham, Alister W.; Mutlu-Pakdil, Burçin +7 more
Aims: This work is the first stage of a campaign to search for intermediate-mass black holes (IMBHs) in low-luminosity active galactic nuclei (LLAGN) and dwarf galaxies. An additional and equally important aim of this pilot study is to investigate the consistency between the predictions of several popular black hole scaling relations and the …
BL Lacertae: X-ray spectral evolution and a black-hole mass estimate
Titarchuk, Lev; Seifina, Elena
We present an analysis of the spectral properties observed in X-rays from active galactic nucleus BL Lacertae using RXTE, Suzaku, ASCA, BeppoSAX, and Swift observations. The total time covered by these observations is approximately 20 yr. We show strong observational evidence that this source undergoes X-ray spectral transitions from the low hard …
Localized recombining plasma in G166.0+4.3: A supernova remnant with an unusual morphology
Uchida, Hiroyuki; Nobukawa, Masayoshi; Tsuru, Takeshi Go +4 more
We observed the Galactic mixed-morphology supernova remnant G166.0+4.3 with Suzaku. The X-ray spectrum in the western part of the remnant is well represented by a one-component ionizing plasma model. The spectrum in the northeastern region can be explained by two components. One is an Fe-rich component with electron temperature kT_e = 0.87_{-0.03}…