Search Publications
The Environment of the Optically Brightest Herbig Ae Star, HD 104237
Apai, D.; Stecklum, B.; Wang, Hongchi +16 more
We investigate the environment of the nearest Herbig Ae star, HD 104237, with a multiwavelength combination of optical coronagraphic, near-IR, and mid-IR imaging supported by optical, UV, and far-ultraviolet spectroscopy. We confirm the presence of T Tauri stars associated with the Herbig Ae star HD 104237, noted by Feigelson et al. We find that t…
Measurements of accretion disc corona size in LMXB: consequences for Comptonization and LMXB models
Church, M. J.; Bałucińska-Church, M.
We present results of measurements of the radial extent of the accretion disc corona in low-mass X-ray binaries (LMXB), i.e. of the radial extent of the thin, hot ADC above the accretion disc. These results prove conclusively the extended nature of the ADC, with radial extent varying from 20 000 km in the faintest sources to 700 000 km in the brig…
The (un)resolved X-ray background in the Lockman Hole
Barcons, X.; Fabian, A. C.; Hasinger, G. +3 more
Most of the soft and a growing fraction of the harder X-ray background has been resolved into emission from point sources, yet the resolved fraction above 7 keV has only been poorly constrained. We use ~700 ks of XMM-Newton observations of the Lockman Hole and a photometric approach to estimate the total flux attributable to resolved sources in a …
Complex Structure of Galaxy Cluster A1689: Evidence for a Merger from X-Ray Data?
Madejski, G. M.; Andersson, K. E.
A1689 is a galaxy cluster at z=0.183 for which previous measurements of its mass by using various techniques gave discrepant results. We present a new detailed measurement of the mass with the data based on X-ray observations with the European Photon Imaging Camera aboard the XMM-Newton Observatory, determined by using an unparameterized deproject…
The Ionized Gas in Local Starburst Galaxies: Global and Small-Scale Feedback from Star Formation
Conselice, Christopher J.; Calzetti, Daniela; Gallagher, John S., III +4 more
The small- and intermediate-scale structure and the fraction of the interstellar medium (ISM) ionized by nonradiative processes are investigated in a small sample of four local starburst galaxies, imaged with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2. The sample comprises three dwarf galaxies, NGC 3077, 4214, and 5253, and one…
The young stellar population in the Serpens Cloud Core: An ISOCAM survey
Prusti, T.; Perault, M.; Olofsson, G. +18 more
We present results from an ISOCAM survey in the two broad band filters LW2 (5-8.5 µm) and LW3 (12-18 µm) of a 0.13 square degree coverage of the Serpens Main Cloud Core. A total of 392 sources were detected in the 6.7 µm band and 139 in the 14.3 µm band to a limiting sensitivity of ∼2 mJy. We identified 53 Young Stellar Obj…
Series of high-frequency slowly drifting structures mapping the flare magnetic field reconnection
Karlický, M.
Rare series of the slowly drifting structures observed during two solar flares (April 11, 2001 and March 18, 2003) in the 0.8-4.5 GHz frequency range are studied. Their time-frequency evolution is compared with topological and X-ray characteristics of the flares. Based on recent modelling of the magnetic field reconnection in the bursting and inte…
Solar Subsurface Fluid Dynamics Descriptors Derived from Global Oscillation Network Group and Michelson Doppler Imager Data
Howe, R.; Komm, R.; Hill, F. +4 more
We analyze Global Oscillation Network Group (GONG) and Michelson Doppler Imager (MDI) observations obtained during Carrington rotation 1988 (2002 March 30-April 26) with a ring-diagram technique in order to measure the zonal and meridional flow components in the upper solar convection zone. We derive daily flow maps over a range of depths up to 16…
The XMM-Newton HBS28 sample: Studying the obscuration in hard X-ray selected AGNs
Page, M. J.; Wolter, A.; Barcons, X. +9 more
This paper presents the analysis of a statistically complete sample of 28 serendipitous X-ray sources selected in 82 pointed XMM-Newton fields down to a count-rate of 0.002 counts s-1 (4.5-7.5 keV energy band). This is the first sample selected in this energy range to have complete spectroscopic identifications and redshift determinatio…
Wide-Field X-Ray Temperature, Pressure, and Entropy Maps of A754
Finoguenov, Alexis; Henry, J. Patrick; Briel, Ulrich G.
We present a mosaic of XMM-Newton observations of the nearby major-merger cluster A754 that has either a wider field or better spectral or spatial resolution than previous observations. We construct maps of X-ray surface brightness and temperature integrated along the line of sight. From these two primary maps we derive pseudopressure and pseudoen…