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Multiwavelength Study of Young Massive Star Clusters in the Interacting Galaxy Arp 24
Wu, Hong; Cao, Chen
We made a multiwavelength study of young massive star clusters (YSCs) in the interacting galaxy Arp 24 using optical and ultraviolet images from the Hubble Space Telescope (HST), the Sloan Digital Sky Survey, and the Galaxy Evolution Explorer, mid-infrared images from the Spitzer Space Telescope, and narrowband Hα images and optical spectra from t…
New pre-main sequence candidates in the Taurus-Auriga star forming region
Audard, M.; Güdel, M.; Grosso, N. +7 more
Aims:We have studied the X-ray source population of the Taurus Molecular Cloud (TMC) to search for new members of the Taurus-Auriga star forming region.
Methods: Candidate members have been selected among the X-ray sources detected in 24 fields of the XMM-Newton Extended Survey of the Taurus Molecular Cloud, having an IR counterpart in the 2MA…
XMM-Newton observations of PSR B1957+20
Becker, W.; Huang, H. H.
We report on XMM-Newton observations of the "Black Widow pulsar", PSR B1957+20. The pulsar's X-ray emission is non-thermal and best modeled with a single powerlaw spectrum of photon index 2.03+0.51-0.36. No coherent X-ray pulsations at the pulsar's spin-period could be detected, though a strong binary-phase dependence of the …
Multi-Wavelength Analysis of 18 µm-Selected Galaxies in the AKARI/Infrared-Camera monitor fieldtowards the North Ecliptic Pole
Im, M.; Lee, H. M.; Serjeant, S. +25 more
We present an initial analysis of AKARI 18z Ultra-Luminous InfraRed Galaxies, and a large variation of the PAH inter-band strength ratio in galaxies at high redshifts.
Spectral Modeling of the High-Energy Emission of the Magnetar 4U 0142+614
Stella, L.; Rea, N.; Tramacere, A. +4 more
We present an empirical spectral modeling of the high-energy emission of the anomalous X-ray pulsar 4U 0142+614 based on simultaneous Swift and INTEGRAL observations from X- to γ-ray energies. We adopted models contained in the XSPEC analysis package, as well as models based on recent theoretical studies, and restricted ourselves to those combinat…
The Intermediate-Age Globular Cluster NGC 1783 in the Large Magellanic Cloud
Mucciarelli, Alessio; Ferraro, Francesco R.; Origlia, Livia
We present Hubble Space Telescope ACS deep photometry of the intermediate-age globular cluster NGC 1783 in the Large Magellanic Cloud. By using this photometric data set, we have determined the degree of ellipticity of the cluster (epsilon = 0.14 ± 0.03) and the radial density profile. This profile is well reproduced by a standard King model with …
Mass distribution in the most X-ray-luminous galaxy cluster RX J1347.5-1145 studied with XMM-Newton
Schindler, S.; Gitti, M.; Piffaretti, R.
Context: We report on the analysis of XMM-Newton observations of RX J1347.5-1145 (z=0.451), the most X-ray-luminous galaxy cluster.
Aims: We present a detailed total and gas mass determination up to large distances (~1.7 Mpc), study the scaling properties of the cluster, and explore the role of AGN heating in the cluster cool core.
Methods…
Transient and Highly Polarized Double-Peaked Hα Emission in the Seyfert 2 Nucleus of NGC 2110
Moran, Edward C.; Eracleous, Michael; Barth, Aaron J. +1 more
We have discovered an extremely broad, double-peaked Hα emission line in the polarized flux spectrum of NGC 2110, establishing that this well-studied Seyfert 2 galaxy contains a disk-like hidden broad-line region (BLR). Several properties of NGC 2110 suggest that it is an obscured twin of Arp 102B, the prototypical double-peaked emission-line acti…
Is the X-ray spectrum of the narrow emission line QSO PG1211+143 defined by its energetic outflow?
Reeves, J. N.; Pounds, K. A.
An XMM-Newton observation of the bright QSO PG1211+143 in 2001 revealed a blueshifted absorption line spectrum indicative of a high-velocity radial outflow of highly ionized gas. Unless highly collimated, the outflow mass rate was shown to be comparable to the accretion rate, with mechanical energy a significant fraction of the bolometric luminosi…
Strength of Coronal Mass Ejection-driven Shocks near the Sun and Their Importance in Predicting Solar Energetic Particle Events
Wang, Yuming; Shen, Chenglong; Wang, S. +3 more
Coronal shocks are important structures, but there are no direct observations of them in solar and space physics. The strength of shocks plays a key role in shock-related phenomena, such as radio bursts and solar energetic particle (SEP) generation. This paper presents an improved method of calculating Alfvén speed and shock strength near the Sun.…