Search Publications

High-resolution Near-infrared Observations of a Small Cluster Associated with a Bright-rimmed Cloud in W5

Kusune, Takayoshi; Watanabe, Makoto; Sugitani, Koji +4 more

We carried out near-infrared (IR) observations to examine star formation toward the bright-rimmed cloud SFO 12, of which the main exciting star is O7V star in W5-W. We found a small young stellar object (YSO) cluster of six members embedded in the head of SFO 12 facing its exciting star, aligned along the UV radiation incident direction from the e…

The Appearance of Non-Spherical Systems. Application to LMXB

Różańska, A.; Madej, J.; Bełdycki, B. +2 more

We study the appearance of the neutron star-accretion disk system as seen by a distant observer in the UV/X-ray domain. The observed intensity spectra are computed assuming non-spherical geometry of the whole system, in which outgoing spectrum is not represented by the flux spectrum, the latter being valid for spherically symmetric objects. Intens…

Dynamic Deuterium Enrichment in Cometary Water via Eley-Rideal Reactions

Yao, Yunxi; Giapis, Konstantinos P.

The deuterium-to-hydrogen ratio (D/H) in water found in the coma of Jupiter family comet (JFC) 67P/Churyumov-Gerasimenko was reported to be (5.3 ± 0.7) × 10^-4, the highest among comets and three times the value for other JFCs with an ocean-like ratio. This discrepancy suggests the diverse origins of JFCs and clouds the issue of the orig…

Evolution of clusters and cosmology

Arnaud, M.

Recent Sunyaev-Zeldovich (SZ) surveys (ACT, Planck, SPT) have provided new cluster catalogs, very significantly expanding the coverage of the mass-redshift plane, while XMM-Newton surveys are pushing cluster detection to lower masses, up to z ∼ 1 and beyond. Cosmological analysis of the new cluster samples, particularly that of the largest Planck …

A strategy for an accurate estimation of the basal permittivity in the Martian North Polar Layered Deposits

Lauro, S. E.; Gennarelli, G.; Pettinelli, E. +4 more

This paper deals with the investigation of the Mars subsurface by means of data collected by the Mars Advanced Radar for Subsurface and Ionosphere Sounding working at few megahertz frequencies. A data processing strategy, which combines a simple inversion model and an accurate procedure for data selection is presented. This strategy permits to mit…

Long-term Study of the Double Pulsar J0737-3039 with XMM-Newton: Spectral Analysis

Iacolina, M. N.; Pellizzoni, A.; Egron, E. +4 more

We present a long-term spectral monitoring of the unique double pulsar binary PSR J0737-3039 corresponding to two “Large Programs” performed by XMM-Newton in 2006 and 2011. Spectral variability of pulsar emission in soft X-rays is not evident over 5 years, despite the significant relativistic spin precession in the considered time span (∼ 25^\circ…

Akari Observations of Dusty Tori of Active Galactic Nuclei

Oyabu, Shinki; Kaneda, Hidehiro; Matsuoka, Yoshiki +4 more

Excess Galactic Molecular Absorption Toward the Radio Galaxy 3C 111

Behar, E.; Reynolds, C. S.; Tombesi, F. +1 more

We show the combined spectral analysis of Chandra high-energy transmission grating and XMM-Newton reflection-grating spectrometer observations of the broad-line radio galaxy 3C 111. This source is known to show excess neutral absorption with respect to the one estimated from 21 cm radio surveys of atomic H I in the Galaxy. However, previous works …

Ultraviolet spectroscopy of symbiotic nova V1016 Cyg with IUE and HST

Sanad, M. R.

We present International Ultraviolet Explorer (IUE) & Hubble Space Telescope Space Telescope Imaging Spectrograph (HST STIS) observations of the symbiotic nova V1016 Cyg through the period 1978 - 2000. Four spectra at different times revealing the changes in line fluxes are presented. The outflow velocity of the emitting region was calculated …

X-ray and optical orbital modulation of EXO 0748-676 : A co-variability study using XMM-Newton

Paul, Biswajit; Raman, Gayathri

We present a multi-wavelength timing study of the eclipsing low mass X-ray binary EXO 0748-676 (UY Vol) using XMM-Newton when the source was in a hard spectral state. The orbital optical and X-ray light curves show a fairly large amount of intensity modulation in the 7 observations taken during September-November, 2003, covering 36 complete binary…