Science Archives Publication System

The measurement errors in the Swift-UVOT and XMM-OM

DOI: 10.1111/j.1365-2966.2007.12549.x Bibcode: 2008MNRAS.383..383K

Kuin, N. P. M.; Rosen, S. R.

The probability of photon measurement in some photon-counting instrumentation, such as the Optical Monitor (OM) on the XMM-Newton satellite, and the Ultraviolet/Optical Telescope (UVOT) on the Swift satellite, does not follow a Poisson distribution due to the detector characteristics, but a binomial distribution. For a single-pixel approximation, …

2008 • Monthly Notices of the Royal Astronomical Society

XMM-Newton 30

Suzaku Spectroscopy of Extended X-Ray Emission in M17

DOI: 10.1093/pasj/60.sp1.S85 Bibcode: 2008PASJ...60S..85H

Hamaguchi, Kenji; Maeda, Yoshitomo; Tsujimoto, Masahiro +5 more

We present the results of a Suzaku spectroscopic study of soft extended X-ray emission in the HII region of M17. The spectrum of the extended emission was obtained with a high signal-to-noise ratio in a spatially resolved manner using the X-ray Imaging Spectrometer (XIS). We established that contamination by unresolved point sources, the Galactic …

2008 • Publications of the Astronomical Society of Japan

Suzaku 30

Testing the galaxy cluster mass-observable relations at z = 1 with XMM-Newton and Chandra observations of XLSSJ022403.9-041328

DOI: 10.1111/j.1365-2966.2008.13313.x Bibcode: 2008MNRAS.387..998M

Valtchanov, I.; Pierre, M.; Willis, J. +7 more

We present an analysis of deep XMM-Newton and Chandra observations of the z = 1.05 galaxy cluster XLSSJ022403.9-041328 (hereafter XLSSC029), detected in the XMM-Newton Large Scale Structure survey. Density and temperature profiles of the X-ray emitting gas were used to perform a hydrostatic mass analysis of the system. This allowed us to measure t…

2008 • Monthly Notices of the Royal Astronomical Society

XMM-Newton 30

X-rays from Venus observed with Chandra

DOI: 10.1016/j.pss.2008.03.008 Bibcode: 2008P&SS...56.1414D

Dennerl, Konrad

X-ray observations of Venus are so challenging that the first detection of Venusian X-rays succeeded only in January 2001, with the Chandra satellite. The X-rays from Venus were found to result from fluorescent scattering of solar X-rays in the Venusian thermosphere. An additional component, caused by charge exchange of highly charged heavy ions i…

2008 • Planetary and Space Science

VenusExpress 30

Supernova remnants with magnetars: Clues to magnetar formation

DOI: 10.1016/j.asr.2007.06.042 Bibcode: 2008AdSpR..41..503V

Vink, Jacco

In this paper I discuss the lack of observational evidence that magnetars are formed as rapidly rotating neutron stars. Supernova remnants containing magnetars do not show the excess of kinetic energy expected for such a formation scenario, nor is there any evidence for a relic pulsar wind nebula. However, it could be that magnetars are formed wit…

2008 • Advances in Space Research

XMM-Newton 30

New Young Brown Dwarfs in the Orion Molecular Cloud 2/3 Region

DOI: 10.1086/590527 Bibcode: 2008ApJ...685..313P

Luhman, K. L.; Smith, J. D.; Megeath, S. T. +7 more

Forty new low-mass members with spectral types ranging from M4 to M9 have been confirmed in the Orion Molecular Cloud (OMC) 2/3 region. Through deep, I-, z'-, J-, H-, and K-band photometry of a 20' × 20' field in OMC 2/3, we selected brown dwarf candidates for follow-up spectroscopy. Low-resolution far-red and near-infrared spectra were obtained f…

2008 • The Astrophysical Journal

eHST 30

ACS imaging of star clusters in M 51. II. The luminosity function and mass function across the disk

DOI: 10.1051/0004-6361:20078831 Bibcode: 2008A&A...487..937H

Larsen, S. S.; Gieles, M.; Lamers, H. J. G. L. M. +2 more

Context: Whether or not there exists a physical upper mass limit for star clusters is as yet unclear. For small cluster samples the mass function may not be sampled all the way to the truncation, if there is one. Data for the rich cluster population in the interacting galaxy M 51 enables us to investigate this in more detail.
Aims: Using HST/A…

2008 • Astronomy and Astrophysics

eHST 30

Ancient groundwater flow in the Valles Marineris on Mars inferred from fault trace ridges

DOI: 10.1038/ngeo131 Bibcode: 2008NatGe...1..181T

Treiman, Allan H.

Groundwater is a crucial reservoir in Mars's global water cycle and plays an important role in aqueous alteration of bedrock. Understanding groundwater flow is also important for assessing the possibility of past and present martian life. The Valles Marineris is a series of fault-bounded troughs and chasms stretching over 4,000km from west to east…

2008 • Nature Geoscience

MEx 30

TeV J2032+4130: a not-so-dark accelerator?

DOI: 10.1111/j.1365-2966.2008.12959.x Bibcode: 2008MNRAS.385.1764B

Rodriguez, J.; Finley, J. P.; Konopelko, A. +5 more

The HEGRA γ-ray source TeV J2032+4130 is considered the prototypical `dark accelerator', since it was the first TeV source detected with no firm counterparts at lower frequencies. The Whipple collaboration observed this source in 2003-05 and the emission hotspot appears displaced about 9 arcmin to the northeast of the HEGRA position, though given …

2008 • Monthly Notices of the Royal Astronomical Society

INTEGRAL 30

A Low-Frequency (30 - 110 MHz) Antenna System for Observations of Polarized Radio Emission from the Solar Corona

DOI: 10.1007/s11207-008-9272-y Bibcode: 2008SoPh..253..319R

Ramesh, R.; Kathiravan, C.; Barve, Indrajit V. +2 more

An interferometer antenna system to observe polarized radio emission from the solar corona at different frequencies in the range 30 - 110 MHz has been commissioned recently by the Indian Institute of Astrophysics at the Gauribidanur Radio Observatory (latitude 13°36^'12^''N and longitude 77°27^'07^''E), abou…

2008 • Solar Physics

SOHO 30