Search Publications
The Next Generation Virgo Cluster Survey XVI: The Angular Momentum of Dwarf Early-type Galaxies from Globular Cluster Satellites
Zhang, Hongxin; Emsellem, Eric; Liu, Chengze +10 more
We analyze the kinematics of six Virgo cluster dwarf early-type galaxies (dEs) from their globular cluster (GC) systems. We present new Keck/DEIMOS spectroscopy for three of them and re-analyze the data found in the literature for the remaining three. We use two independent methods to estimate the rotation amplitude (V rot) and velocity…
First stars of the ρ Ophiuchi dark cloud. XMM-Newton view of ρ Oph and its neighbors
Pillitteri, I.; Wolk, S. J.; Goodman, A. +1 more
Star formation in molecular clouds can be triggered by the dynamical action of winds from massive stars. Furthermore, X-ray and UV fluxes from massive stars can influence the life time of surrounding circumstellar disks. We present the results of a 53 ks XMM-Newton observation centered on the ρ Ophiuchi A+B binary system. ρ Ophiuchi lies in the ce…
Impact ejecta-induced melting of surface ice deposits on Mars
Head, James W.; Weiss, David K.
Fluvial features present around impact craters on Mars can offer insight into the ancient martian climate and its relationship to the impact cratering process. The widespread spatial and temporal distribution of surface ice on Mars suggests that the interaction between impact cratering and surface ice could have been a relatively frequent occurren…
Constraints on small-scale cosmological fluctuations from SNe lensing dispersion
Ben-Dayan, Ido; Takahashi, Ryuichi
We provide predictions on small-scale cosmological density power spectrum from supernova lensing dispersion. Parametrizing the primordial power spectrum with running α and running of running β of the spectral index, we exclude large positive α and β parameters which induce too large lensing dispersions over current observational upper bound. We ra…
Observations of solar flares with IRIS and SDO
Innes, D. E.; Li, D.; Ning, Z. J.
Flare kernels brighten simultaneously in all Solar Dynamics Observatory (SDO) Atmospheric Imaging Assembly (AIA) channels making it difficult to determine their temperature structure. The Interface Region Imaging Spectrograph (IRIS) is able to spectrally resolve Fe xxi emission from cold chromospheric brightenings, so it can be used to infer the a…
Glancing through the accretion column of EXO 2030+375
Klochkov, Dmitry; Ferrigno, Carlo; Zdziarski, Andrzej A. +3 more
Context. The current generation of X-ray instruments progressively reveals more and more details about the complex magnetic field topology and the geometry of the accretion flows in highly magnetized accretion-powered pulsars.
Aims: We took advantage of the large collecting area and good timing capabilities of the EPIC cameras onboard XMM-New…
The segregation of starless and protostellar clumps in the Hi-GAL ℓ = 224° region
Elia, D.; Olmi, L.; Cunningham, M. +1 more
Context. Stars form in dense, dusty structures, which are embedded in larger clumps of molecular clouds often showing a clear filamentary structure on large scales (≳1 pc). The origin (e.g., turbulence or gravitational instabilities) and evolution of these filaments, as well as their relation to clump and core formation, are not yet fully understo…
YSO jets in the Galactic plane from UWISH2 - III. Jets and outflows in Cassiopeia and Auriga
Froebrich, D.; Makin, S. V.
We present the analysis of 35.5 deg2 of images in the 1-0 S(1) line of H2 from the UK Widefield Infrared Survey for H2 (UWISH2) towards Cassiopeia and Auriga. We have identified 98 Molecular Hydrogen emission-line Objects (MHOs) driven by Young Stellar Objects, 60 per cent of which are bipolar outflows and all are …
V4743 Sgr, a magnetic nova?
Mukai, K.; Orio, M.; Bianchini, A. +3 more
Two XMM-Newton observations of Nova V4743 Sgr (Nova Sgr 2002) were performed shortly after it returned to quiescence, 2 and 3.5 yr after the explosion. The X-ray light curves revealed a modulation with a frequency of ≃0.75 mHz, indicating that V4743 Sgr is most probably an intermediate polar (IP). The X-ray spectra have characteristics in common w…
GRS 1739-278 Observed at Very Low Luminosity with XMM-Newton and NuSTAR
Harrison, F. A.; Stern, D.; Yamaoka, K. +19 more
We present a detailed spectral analysis of XMM-Newton and NuSTAR observations of the accreting transient black hole GRS 1739-278 during a very faint low hard state at ∼0.02% of the Eddington luminosity (for a distance of 8.5 kpc and a mass of 10 {M}⊙ ). The broadband X-ray spectrum between 0.5 and 60 keV can be well-described by a power…