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A complete view of the broad-line radio galaxy 4C +74.26 with XMM-Newton
Ballantyne, D. R.
This paper presents a timing study and broad-band spectral analysis of the broad-line radio galaxy 4C +74.26 based on a 35-ks XMM-Newton observation. As found in previous data sets, the source exhibits no evidence for rapid variability, and its 0.2-10 keV light curve is well fitted by a constant. An excellent fit to the pn 0.3-12 keV spectrum was …
Survey of energetic O+ ions near the dayside mid-latitude magnetopause with Cluster
Sauvaud, J. -A.; Balogh, A.; Klecker, B. +7 more
Since December 2000, the Cluster satellites have been conducting detailed measurements of the magnetospheric boundaries and have confirmed the unambiguous presence of ions of terrestrial origin (e.g. O+ in regions adjacent to the dayside, mid-latitude magnetopause. In the present paper, we focus on the statistical properties of the O
A Possible Detection of M31* with Chandra
Williams, Benjamin F.; Kong, Albert K. H.; Barmby, Pauline +5 more
Two independent sets of Chandra and HST images of the nuclear region of M31 allow registration of X-ray and optical images to ~0.1". This registration shows that none of the bright (~1037 ergs s-1) X-ray sources near the nucleus is coincident with the central supermassive black hole, M31*. A 50 ks Chandra HRC image shows 2.5 …
A survey for Fe 6.4 keV emission in young stellar objects in ρ Oph: The strong fluorescence from Elias 29
Tsujimoto, M.; Micela, G.; Favata, F. +2 more
We report the results of a search for 6.4 keV Fe fluorescent emission in Young Stellar Objects (YSOs) with measured accretion luminosities in the ρ Oph cloud, using the existing Chandra and XMM-Newton observations of the region. A total of nine such YSOs have X-ray data with sufficiently high S/N for the 6.4 keV line to be potentially detected if …
Physical parameters of rich LMC clusters from modeling of deep HST colour-magnitude diagrams
Santiago, B. X.; Kerber, L. O.
We present the analysis of deep colour-magnitude diagrams (CMDs) of five rich LMC clusters. The data were obtained with HST/WFPC2 in the F555W (~V) and F814W (~I) filters, reaching V555 ∼ 25. The sample of clusters is composed of NGC 1805 and NGC 1818, the youngest ones (τ < 100 Myr), NGC 1831 and NGC 1868, of intermediate-age ( 400 …
Observational evidence for the presence of PAHs in distant Luminous Infrared Galaxies using ISO and Spitzer
Elbaz, D.; Le Floc'h, E.; Dole, H. +1 more
We present ISOCAM 15 µm and MIPS 24 µm photometry of a sample of 16 distant Luminous Infrared Galaxies (LIRGs) characterized by a median luminosity L_IR ∼ 2 × 1011~L⊙ and redshift z = 0.7 (distributed from z = 0.1 to 1.2). While some sources display 24/15 µm flux ratios also consistent with a featureless con…
Outgassing-induced effects in the rotational state of comet 67P/Churyumov—Gerasimenko during the Rosetta mission
Samarasinha, Nalin H.; Lamy, Philippe; Jorda, Laurent +1 more
The new target of the Rosetta mission is comet 67P/Churyumov-Gerasimenko (hereafter 67P/C-G). In order to support the planning of the mission, in particular the strategy during the mapping and landing phases, we have performed numerical simulations of the rotational evolution of a comet in the orbit of 67P/C-G. In these simulations, the currently …
Further evidence for a merger in Abell 2218 from an XMM-Newton observation
Finoguenov, A.; Böhringer, H.; Pratt, G. W.
The galaxy cluster Abell 2218, at z=0.171, is well-known for the discrepancy between mass estimates derived from X-ray and strong lensing analyses. With the present XMM-Newton observation, we are able to trace the gas density and temperature profiles out to a radius of ∼ 1400~h70-1 kpc (approximately the virial radius of the …
ISO observations of the Galactic center interstellar medium. Ionized gas
Rodríguez-Fernández, N. J.; Martín-Pintado, J.
We present fine structure and recombination line observations of the ionized gas toward a sample of 18 sources located within 300 pc of the center of the Galaxy (hereafter Galactic center, GC). The sources were selected as molecular clouds located far from thermal continuum sources. The fine structure lines from [NII] and [SIII] were detected in 1…
Deep Near-Infrared Imaging and Photometry of the Antennae Galaxies with WIRC
Hayward, T. L.; Houck, J. R.; Brandl, B. R. +6 more
We present deep near-infrared images of the Antennae galaxies, taken with the Palomar Wide-Field Infrared Camera (WIRC). The images cover a 4.33 arcmin ×4.33 arcmin (24.7×24.7 kpc) area around the galaxy interaction zone. We derive J- and Ks-band photometric fluxes for 172 infrared star clusters and discuss details of the two galactic n…