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A Ringed Dwarf LINER 1 Galaxy Hosting an Intermediate-mass Black Hole with Large-scale Rotation-like Hα Emission
Qian, Lei; Cai, Zheng; Kim, Minjin +7 more
We report the discovery of a 20 kpc sized {{H}}α emission in SDSS J083803.68+540642.0, a ringed dwarf galaxy ({M}V=-17.89 mag) hosting an accreting intermediate-mass black hole at z = 0.02957. Analysis of the Hubble Space Telescope images indicates that it is an early-type galaxy with a featureless low-surface brightness disk ({µ …
An XMM-Newton proton response matrix
Molendi, Silvano; Lotti, Simone; Mineo, Teresa +1 more
Soft protons constitute an important source of background in focusing X-ray telescopes, as Chandra and XMM-Newton experience has shown. The optics in fact transmit them to the focal plane with efficiency similar to the X-ray photon one. This effect is a good opportunity to study the environment of the Earth magnetosphere crossed by the X-ray satel…
The globular cluster system of NGC 1316. IV. Nature of the star cluster complex SH2
Bresolin, F.; Hilker, M.; Gómez, M. +3 more
Context. The light of the merger remnant NGC 1316 (Fornax A) is dominated by old and intermediate-age stars. The only sign of current star formation in this big galaxy is the Hii region SH2, an isolated star cluster complex with a ring-like morphology and an estimated age of 0.1 Gyr at a galactocentric distance of about 35 kpc. A nearby intermedia…
Observations of a Coronal Shock Wave and the Production of Solar Energetic Particles
Ding, M. D.; Li, C.; Xu, Z. G.
We present a study that clarifies the acceleration source/mechanism of the solar energetic particle (SEP) event on 2011 August 9. Based on the assumption of scatter-free propagation of charged particles along the interplanetary magnetic field, the solar particle release times of the electrons and protons are derived and both found to be in the dec…
Two years of solar wind and pickup ion measurements at comet 67P/Churyumov-Gerasimenko
Glassmeier, K. -H.; Nilsson, H.; Eriksson, A. +8 more
The Ion and Electron Sensor (IES) as well as other members of the Rosetta Plasma Consortium (RPC) on board the Rosetta spacecraft (S/C) measured the characteristics of the solar wind almost continuously since its arrival at 67P/Churyumov-Gerasimenko (CG) in 2014 August. An important process at a comet is the so-called pickup process in which a new…
An eLIMA model for the 67 s X-ray periodicity in CAL 83
Meintjes, P. J.; Odendaal, A.
Supersoft X-ray sources (SSSs) are characterized by their low effective temperatures and high X-ray luminosities. The soft X-ray emission can be explained by hydrogen nuclear burning on the surface of a white dwarf (WD) accreting at an extremely high rate. A peculiar ∼67 s periodicity (P67) was previously discovered in the XMM-Newton li…
Changes in the Martian atmosphere induced by auroral electron precipitation
Gérard, J. -C.; Hubert, B.; Shematovich, V. I. +1 more
Typical auroral events in the Martian atmosphere, such as discrete and diffuse auroral emissions detected by UV spectrometers onboard ESA Mars Express and NASA MAVEN, are investigated. Auroral electron kinetic energy distribution functions and energy spectra of the upward and downward electron fluxes are obtained by electron transport calculations…
Strong Lensing Analysis of the Galaxy Cluster MACS J1319.9+7003 and the Discovery of a Shell Galaxy
Zitrin, Adi
We present a strong-lensing (SL) analysis of the galaxy cluster MACS J1319.9+7003 (z = 0.33, also known as Abell 1722), as part of our ongoing effort to analyze massive clusters with archival Hubble Space Telescope (HST) imaging. We spectroscopically measured with Keck/Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE) two galaxies mult…
Young star clusters in circumnuclear starburst rings
Ho, Luis C.; de Grijs, Richard; Anders, Peter +2 more
We analyse the cluster luminosity functions (CLFs) of the youngest star clusters in two galaxies exhibiting prominent circumnuclear starburst rings. We focus specifically on NGC 1512 and NGC 6951, for which we have access to Hα data that allow us to unambiguously identify the youngest sample clusters. To place our results on a firm statistical foo…
Reanalysis of high-resolution XMM-Newton data of V2491 Cygni using models of collisionally ionized hot absorbers
Balman, Ş.; Gamsızkan, Ç.
Aims: We model spectral absorption features in data of the high-resolution XMM-Newton Reflection Grating Spectrometer.
Methods: We performed X-ray spectral analysis and modeling using the SRON software SPEX version 2.05.04.
Results: We present a reanalysis of data obtained with the XMM-Newton Reflection Grating Spectrometer of the c…