Search Publications
Merging clusters of galaxies observed with XMM-Newton
Pratt, G. W.; Bourdin, H.; Sauvageot, J. -L. +1 more
We present results from the XMM-Newton observations of our ongoing program on merging clusters. To date three clusters have been observed, covering the temporal sequence from early to late stage mergers: A1750, A2065 and A3921. Using spatially-resolved spectroscopy of discrete regions, hardness ratio and temperature maps, we show that all three cl…
The X-ray emission from Young Stellar Objects in the ρ Ophiuchi cloud core as seen by XMM-Newton
Grosso, N.; Montmerle, T.; Ozawa, H.
Dust in the Host Galaxies of Supernovae
Chary, R.; Pope, A.; Ravindranath, S. +2 more
We present Spitzer MIPS 24 µm observations of 50 supernova host galaxies at 0.1<z<1.7 in the Great Observatories Origins Deep Survey (GOODS) fields. We also discuss the detection of SN host galaxies in SCUBA/850 µm observations of GOODS-N and Spitzer Infrared Spectrograph (IRS) 16 µm observations of GOODS-S. About 60% of th…
The opacity of spiral galaxy disks. VII. The accuracy of galaxy counts as an extinction probe
Allen, Ronald J.; Holwerda, B. W.; van der Kruit, P. C. +1 more
The "Synthetic Field Method" (SFM) was introduced by González et al. (1998, ApJ, 506, 152) to calibrate numbers of distant galaxies as a probe of extinction in a foreground spiral disk. González et al. (2003, AJ, 125, 1182) studied the effect of the foreground disk on these numbers using simulations of current and future instruments for fields in …
Multi-point observation of the high-speed flows in the plasma sheet
Balogh, A.; Zhang, T. L.; Klecker, B. +9 more
The structure of the high-speed flows in the midtail plasma sheet is discussed based on results from multi-point observation of Cluster spacecraft in summer 2001 and 2002. The average rate of change in flow speed along the "dawn-dusk" direction (perpendicular to the main flow and in the plane of the tail current sheet) and along the "north-south" …
A Variability Study of the Seyfert 2 Galaxy NGC 6300 with XMM-Newton
Awaki, Hisamitsu; Hayashida, Kiyoshi; Leighly, Karen M. +3 more
We present the results of timing analysis of the XMM-Newton observation of the Seyfert 2 galaxy NGC 6300. The hard X-ray spectrum above 2 keV consists of a Compton-thin absorbed power law, as is often seen in Seyfert 2 galaxies. We clearly detected rapid time variability on a timescale of about 1000 s from the light curve above 2 keV. The excess v…
Abundances in planetary nebulae: NGC 6886
Pottasch, S. R.; Surendiranath, R.
ISO and IUE spectra of the round-shaped planetary nebula
Theoretical Isochrones with Extinction in the K Band
Lee, Myung Gyoon; Figer, Donald F.; Kim, Sungsoo S. +1 more
We calculate theoretical isochrones in a consistent way for five filters (K, K', Ks, F205W, and F222M) in the atmospheric window between 1.9 and 2.5 µm using the Padova stellar evolutionary models by Girardi et al. Even when displayed in the same Vega magnitude system, the near-infrared colors of the same isochrone can …
Midcourse Space Experiment Observations of Small Solar System Bodies
Lisse, C. M.; Mäkinen, T.; Walker, R. G. +4 more
Eight comets, two transition objects (extinct comet candidates), and two near-Earth asteroids were imaged in four infrared bands with the SPIRIT III instrument on the Midcourse Space Experiment, namely, C/1996 B2 (Hyakutake), C/1995 O1 (Hale-Bopp), C/1996 Q1 (Tabur), 126P/IRAS, 22P/Kopff, 46P/Wirtanen, (3200) Phaethon, (4015) 107P/Wilson-Harringto…
HD 166181 = V815 Herculis, a Single-lined Spectroscopic Multiple System
Pourbaix, D.; Fekel, Francis C.; Scarfe, C. D. +2 more
We have obtained extensive spectroscopic and velocity spectrometer observations of HD 166181, a previously known single-lined spectroscopic binary. Our improved orbit for the G6 V primary has a period of 1.8098343 days and is circular. Although the lines of additional components have not been detected, radial velocity measurements confirm that the…