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XMM-Newton observations of UW CrB: detection of X-ray bursts and evidence for accretion disc evolution
Ramsay, Gavin; Mukai, Koji; Hakala, Pasi +4 more
UW CrB (MS 1603+2600) is a peculiar short-period X-ray binary that exhibits extraordinary optical behaviour. The shape of the optical light curve of the system changes drastically from night to night, without any changes in overall brightness. Here we report X-ray observations of UW CrB obtained with XMM-Newton. We find evidence for several X-ray …
Is the INTEGRAL IBIS Source IGR J17204-3554 a Gamma-Ray-emitting Galaxy Hidden behind the Molecular Cloud NGC 6334?
Gehrels, N.; Walter, R.; Bird, A. J. +9 more
We report on the identification of a soft gamma-ray source, IGR J17204-3554, detected with IBIS, the Imager on Board the INTEGRAL Satellite. The source has a 20-100 keV flux of ~3×10-11 ergs cm-2 s-1 and is spatially coincident with NGC 6334, a molecular cloud located in the Sagittarius arm of the Milky Way. Diffus…
Optical spectroscopy of X-Mega targets - V. The spectroscopic binary HD 93161 A and its visual companion HD 93161 B*
Gosset, E.; Nazé, Y.; Rauw, G. +2 more
We present the analysis of an extensive set of high-resolution spectroscopic observations of HD 93161, a visual binary with a separation of 2 arcsec. HD 93161 A is a spectroscopic binary, with both components clearly detected throughout the orbit. The primary star is most probably of spectral type O8V, while the secondary is likely an O9V. We obta…
Spectroscopy and stellar populations of star-forming galaxies at z ~ 3 in the Hubble Deep Field - South
Burgarella, D.; Inoue, A. K.; Iwata, I.
We present results of VLT/FORS2 spectroscopy of galaxies at z ∼ 3 in the Hubble Deep Field - South (HDF-S). A sample of galaxies was drawn from the photometric redshift catalogue based on the HST/WFPC2 optical images and the deep near-infrared images obtained with VLT/ISAAC as a part of the Faint Infrared Extragalactic Survey (FIRES) project. We s…
Proper Orthogonal Decomposition of Solar Photospheric Motions
Vecchio, A.; Carbone, V.; Veltri, P. +5 more
The spatiotemporal dynamics of the solar photosphere is studied by performing a proper orthogonal decomposition (POD) of line of sight velocity fields computed from high resolution data coming from the MDI/SOHO instrument. Using this technique, we are able to identify and characterize the different dynamical regimes acting in the system. Low-frequ…
Investigating ionized disc models of the variable narrow-line Seyfert 1 PG 1404+226
Brandt, W. N.; Fabian, A. C.; Boller, Th. +1 more
We investigate the use of relativistically blurred photoionized disc models on an XMM-Newton observation of the narrow-line Seyfert 1 galaxy PG 1404+226. The model is designed to reproduce the radiation from the inner accretion disc around a Kerr black hole, and is more successful at fitting the spectrum than models based on a thermal soft excess.…
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 …