Search Publications
Missions
Journals
Publication Years
XMM-Newton Observation of the Cluster Zw 1305.4+2941 in the Field SA 57
Gastaldello, Fabio; Fusco-Femiano, Roberto; Vagnetti, Fausto +1 more
We report the details of an XMM-Newton observation of the cluster of galaxies Zw 1305.4+2941 at the intermediate redshift z = 0.241, increasing the small number of interesting X-ray constraints on properties of ~3 keV systems above z = 0.1. Based on the ~45 ks XMM-Newton observation, we find that within a radius of 228 kpc the cluster has an unabs…
On the peculiar properties of the narrow-line quasar PG 1543+489
Bianchi, Stefano; Piconcelli, Enrico; Vignali, Cristian +1 more
We present the analysis of four XMM-Newton observations of the narrow-line quasar PG 1543+489 at z = 0.400 carried out over a rest-frame time-scale of about 3 yr. The X-ray spectrum is characterized by a broad, relativistic iron Kα emission line and a steep photon index, which can be both explained by a ionized reflection model, where the source o…
Impact of Active Regions on Coronal Hole Outflows
Habbal, Shadia Rifai; McIntosh, Scott W.; Scholl, Isabelle F.
Establishing the sources of the fast and slow solar wind is important for understanding their drivers and their subsequent interaction in interplanetary space. Although coronal holes continue to be viewed as the main source of the fast solar wind, there is recent evidence that the quiet Sun provides other spatially concentrated sources. To identif…
Number Density Evolution of Ks-Band-Selected High-Redshift Galaxy Populations in the AKARI North Ecliptic Pole Field
Oyabu, Shinki; Matsuhara, Hideo; Takagi, Toshinobu +5 more
We present the number counts of Ks-band-selected high-redshift galaxy populations such as extremely red objects (EROs), B-, z-, and K-band-selected galaxies (BzKs) and distant red galaxies (DRGs) in the AKARI NEP field. These high-redshift galaxy samples are extracted from a multicolor catalog combining optical data from Suprime-Cam on …
Suzaku Observations of the Cluster of Galaxies Abell 2052
Kunieda, Hideyo; Ohashi, Takaya; Mitsuda, Kazuhisa +7 more
The results from Suzaku X-ray Imaging Spectrometer (XIS) observations of relaxed cluster of galaxies, Abell 2052, are presented. Offset pointing data were used to estimate the Galactic foreground emission in the direction of the cluster. Significant soft X-ray excess emission above this foreground, the intracluster medium emission, and other backg…
Young globular clusters in an old S0: clues to the formation history of NGC 4570
Anders, P.; Kotulla, R.; Fritze, U.
We here present our first attempt to use globular clusters as tracers of their parent galaxy's formation history. Globular cluster systems of most early-type galaxies feature two peaks in their optical colour distributions. Blue-peak globular clusters are generally believed to be old and metal-poor. The ages, metallicities, and the origin of the r…
The MESSENGER mission to Mercury: Status after the Venus flybys
Solomon, Sean C.; McNutt, Ralph L., Jr.; Grant, David G. +2 more
NASA's MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft, launched on 3 August 2004, is well into its voyage to initiate a new era in our understanding of the terrestrial planets. The mission, spacecraft, and payload are designed to answer six fundamental questions regarding the innermost planet during three flyb…
Far-infrared spectroscopic observations of the Galactic center region
Nakagawa, T.; Okada, Y.; Spaans, M. +2 more
Context: The Galactic center region is luminous in the far-infrared (FIR), but dominant sources of this luminosity are still controversial.
Aims: We investigate physical conditions of the diffuse interstellar medium in the Galactic center region by multi-line spectroscopy in the FIR.
Methods: We analyze the archival data of the Galactic ce…
Central Spiral Structure of Molecular Gas in Maffei 2
Kuno, Nario; Nakanishi, Kouichiro; Sorai, Kazuo +1 more
The distribution and kinematics of molecular gas in the central region of the barred spiral galaxy Maffei2 were investigated using a data set of 12CO(1-0),12CO(2-1), CS(2-1) lines, and 103GHz continuum. We found that the offset ridges along the kpc-scale bar continue to the central spiral structure embedded in a weak oval str…
Study of reconnection-associated multiscale fluctuations with Cluster and Double Star
Zhang, T. L.; Lucek, E.; RèMe, H. +8 more
The objective of the paper is to asses the specific spectral scaling properties of magnetic reconnection associated fluctuations/turbulence at the earthward and tailward outflow regions observed simultaneously by the Cluster and Double Star (TC-2) spacecraft on 26 September 2005. Systematic comparisons of spectral characteristics, including varian…