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The Arches Cluster: Extended Structure and Tidal Radius
Hosek, Matthew W., Jr.; Lu, Jessica R.; Clarkson, William I. +3 more
At a projected distance of ∼26 pc from Sgr A*, the Arches cluster provides insight into star formation in the extreme Galactic center (GC) environment. Despite its importance, many key properties, such as the cluster’s internal structure and orbital history, are not well known. We present an astrometric and photometric study of the outer region of…
Slow electron holes in multicomponent plasmas
André, M.; Vaivads, A.; Khotyaintsev, Yu. V. +2 more
Electrostatic solitary waves (ESWs), often interpreted as electron phase space holes, are commonly observed in plasmas and are manifestations of strongly nonlinear processes. Often slow ESWs are observed, suggesting generation by the Buneman instability. The instability criteria, however, are generally not satisfied. We show how slow electron hole…
O2 Emission toward Orion H2 Peak 1 and the Role of FUV-illuminated C-shocks
Kaufman, Michael J.; Melnick, Gary J.
Molecular oxygen (O2) has been the target of ground-based and space-borne searches for decades. Of the thousands of lines of sight surveyed, only those toward Rho Ophiuchus and Orion H2 Peak 1 have yielded detections of any statistical significance. The detection of the O2 NJ = 33-12
Spatial deconvolution of spectropolarimetric data: an application to quiet Sun magnetic elements
Ruiz Cobo, B.; Quintero Noda, C.; Orozco Suárez, D. +1 more
Context. One of the difficulties in extracting reliable information about the thermodynamical and magnetic properties of solar plasmas from spectropolarimetric observations is the presence of light dispersed inside the instruments, known as stray light.
Aims: We aim to analyze quiet Sun observations after the spatial deconvolution of the data…
Unusual A2142 supercluster with a collapsing core: distribution of light and mass
Park, Changbom; Nevalainen, Jukka; Tempel, Elmo +6 more
Context. Superclusters of galaxies can be used to test cosmological models of the formation and evolution of the largest structures in the cosmic web, and of galaxy and cluster evolution in superclusters.
Aims: We study the distribution, masses, and dynamical properties of galaxy groups in the A2142 supercluster.
Methods: We analyse the …
First New Solar Models with OPAS Opacity Tables
Salmon, S.; Turck-Chièze, S.; Le Pennec, M. +4 more
Stellar seismology appears more and more as a powerful tool for a better determination of the fundamental properties of solar-type stars. However, the particular case of the Sun is still challenging. For about a decade now, the helioseismic sound-speed determination has continued to disagree with the standard solar model (SSM) prediction, question…
Non-local bias in the halo bispectrum with primordial non-Gaussianity
Ross, Ashley J.; Tasinato, Gianmassimo; Wands, David +1 more
Primordial non-Gaussianity can lead to a scale-dependent bias in the density of collapsed halos relative to the underlying matter density. The galaxy power spectrum already provides constraints on local-type primordial non-Gaussianity complementary those from the cosmic microwave background (CMB), while the bispectrum contains additional shape inf…
Band-9 ALMA Observations of the [N II] 122 µm Line and FIR Continuum in Two High-z galaxies.
Sheth, Kartik; Falgarone, Edith; Nikola, Thomas +4 more
We present Atacama Large Millimeter Array (ALMA) observations of two high-redshift systems (SMMJ02399-0136 at z 1 ∼ 2.8 and the Cloverleaf QSO at z 1 ∼ 2.5) in their rest-frame 122 µm continuum (ν sky ∼ 650 GHz, λ sky ∼ 450 µm) and [N ii] 122 µm line emission. The continuum observations…
X-ray time lags and non-linear variability in the ultraluminous X-ray sources NGC 5408 X-1 and NGC 6946 X-1
Vaughan, S.; Roberts, T. P.; Middleton, M. +1 more
We present our analysis of the X-ray variability of two ultraluminous X-ray sources (ULXs) based on multiple XMM-Newton observations. We show that the linear rms-flux relation is present in eight observations of NGC 5408 X-1 and also in three observations of NGC 6946 X-1, but data from other ULXs are generally not sufficient to constrain any rms-f…
Characterizing extragalactic anomalous microwave emission in NGC 6946 with CARMA
Hensley, Brandon; Murphy, Eric; Staguhn, Johannes
Using 1 cm and 3 mm observations from the Combined Array for Research in Millimeter-wave Astronomy and 2 mm observations from the Goddard IRAM Superconducting 2 Millimeter Observer observations, we follow up the first extragalactic detection of anomalous microwave emission (AME) reported by Murphy et al. in an extranuclear region (Enuc. 4) of the …