Science Archives Publication System

Diffuse X-Ray Emission from M101

DOI: 10.1086/373947 Bibcode: 2003ApJ...588..264K

Mukai, K.; Kuntz, K. D.; Snowden, S. L. +1 more

The total 0.45-1.0 keV luminosity of M101 is 3.2×10³⁹ ergs s^-1, of which 2.3×10³⁹ ergs s^-1 is due to diffuse emission. (Chandra observes only ~60% of the diffuse emission observed by ROSAT because of its superior point-source detection.) Of the diffuse emission seen by Chandra, no more than 6% can be due…

2003 • The Astrophysical Journal

eHST 34

Elemental Abundances for the 1996 Streamer Belt

DOI: 10.1086/346132 Bibcode: 2003ApJ...585.1062U

Wurz, P.; Raymond, J. C.; Uzzo, M. +2 more

The purpose of this paper is to explore the observed physical characteristics of the solar corona streamer belt from 1996 June 1 to August 5. The UV spectral data was collected by the Ultraviolet Coronagraph Spectrometer (UVCS) instrument on board the Solar and Heliospheric Observatory (SOHO) spacecraft. From this data the abundances of oxygen, si…

2003 • The Astrophysical Journal

SOHO 34

XMM-Newton observation of the ULIRG NGC 6240. The physical nature of the complex Fe K line emission

DOI: 10.1051/0004-6361:20031217 Bibcode: 2003A&A...411...63B

Costantini, E.; Hasinger, G.; Boller, Th. +5 more

We report on an XMM-Newton observation of the ultraluminous infrared galaxy NGC 6240. The 0.3-10 keV spectrum can be successfully modelled with: (i) three collisionally ionized plasma components with temperatures of about 0.7, 1.4, and 5.5 keV; (ii) a highly absorbed direct power-law component; and (iii) a neutral Fe Kalpha and Kbeta line. We dete…

2003 • Astronomy and Astrophysics

XMM-Newton 34

Magnetic mirror structures observed by Cluster in the magnetosheath

DOI: 10.1029/2003GL017313 Bibcode: 2003GeoRL..30.1802C

Glassmeier, K. -H.; Treumann, R.; Constantinescu, O. D. +1 more

We present a method for identification of magnetic mirror structures (MMS) in multi-point spacecraft measurements and for deriving their full 3D geometry. Multiple minima in magnetic field data are no longer regarded as separate MMS but as belonging to the same mirror structure. The approach is based on fitting a model magnetic field to measured d…

2003 • Geophysical Research Letters

Cluster 34

The Nuclear Spectral Energy Distribution of NGC 6251: A BL Lacertae Object in the Center of an FR I Radio Galaxy

DOI: 10.1086/378289 Bibcode: 2003ApJ...597..166C

Chiaberge, Marco; Capetti, Alessandro; Gilli, Roberto +1 more

We determine the nuclear spectral energy distribution (SED) from the radio to the gamma-ray band for the FR I radio galaxy NGC 6251, by using data from the literature and analyzing Hubble Space Telescope and X-ray archival data. In the logν-log(νF_ν) representation, the SED has two broad peaks, and it is remarkably similar to those of bl…

2003 • The Astrophysical Journal

eHST 34

A simple analytical expression for the power spectrum of cascading Alfvén waves in the solar wind

DOI: 10.1051/0004-6361:20030914 Bibcode: 2003A&A...407..713V

Laitinen, T.; Fichtner, H.; Vainio, R.

Alfvén wave transport in the solar wind, including non-linear spectral energy transfer, is studied. We present numerical solutions of wave transport using a diffusive flux function previously introduced for spectral energy transfer, and compare it with the analytical solution obtained for a convective flux function. The two models of cascading pro…

2003 • Astronomy and Astrophysics

SOHO 34

Optical and Near-Infrared Spectroscopy of a High-Redshift Hard X-Ray-emitting Spiral Galaxy

DOI: 10.1086/367792 Bibcode: 2003AJ....125.1236D

Graham, James R.; Eckart, Megan E.; Spinrad, Hyron +4 more

We present optical and near-infrared Keck spectroscopy of CXOHDFN J123635.6+621424 (HDFX 28), a hard X-ray source at a redshift of z=2.011 in the flanking fields of the Hubble Deep Field North (HDF-N). HDFX 28 is a red source (R-K_s=4.74) with extended steep-spectrum (α^8.4_1.4 GHz>0.87 GHz) microjansky radio emiss…

2003 • The Astronomical Journal

eHST 34

The X-Ray Binary GRS 1741.9-2853 in Outburst and Quiescence

DOI: 10.1086/378851 Bibcode: 2003ApJ...598..474M

Muno, M. P.; Baganoff, F. K.; Arabadjis, J. S.

We report Chandra and XMM-Newton observations of the transient neutron star low-mass X-ray binary GRS 1741.9-2853. Chandra detected the source in outburst on 2000 October 26 at an X-ray luminosity of ~10³⁶ ergs s^-1 (2-8 keV; 8 kpc), and in quiescence on 2001 July 18 at ~10³² ergs s^-1. The latter observat…

2003 • The Astrophysical Journal

XMM-Newton 34

Plasma properties above coronal active regions inferred from SOHO/UVCS and radio spectrograph observations

DOI: 10.1051/0004-6361:20021844 Bibcode: 2003A&A...400..347M

Raymond, J. C.; Wu, R.; Kohl, J. +3 more

Information on coronal plasma was inferred from the joint analysis of type {II} radio bursts and SOHO UltraViolet Coronagraph Spectrometer (UVCS) observations. The data sample comprises 37 metric type {II} radio bursts observed by ground-based radio spectrographs in 1999, during the rising phase of the solar cycle. The coronal electron densities n…

2003 • Astronomy and Astrophysics

SOHO 34

The Multicolored Hot Interstellar Medium of ``the Antennae'' Galaxies (NGC 4038/4039)

DOI: 10.1086/378791 Bibcode: 2003ApJ...598..272F

Zezas, A.; Fabbiano, G.; Krauss, M. +2 more

We report the results of the analysis of the extended soft emission discovered in the Chandra ACIS pointing at the merging system NGC 4038/4039 (``the Antennae''). We present a multicolor X-ray image that suggests both extensive absorption by the dust in this system, peaking in the contact region, as well as variations in the temperature of differ…

2003 • The Astrophysical Journal

eHST 33