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Observations of Magnetic Flux-rope Oscillation during the Precursor Phase of a Solar Eruption
Zhang, J.; Wang, J. X.; Zhou, G. P.
Based on combined observations from the Interface Region Imaging Spectrograph (IRIS) spectrometer with the coronal emission line of Fe xxi at 1354.08 Å and SDO/AIA images in multiple passbands, we report the finding of the precursor activity manifested as the transverse oscillation of a sigmoid, which is likely a pre-existing magnetic flux rope (M…
Overconfidence in photometric redshift estimation
Wittman, David; Bhaskar, Ramya; Tobin, Ryan
We describe a new test of photometric redshift performance given a spectroscopic redshift sample. This test complements the traditional comparison of redshift differences by testing whether the probability density functions p(z) have the correct width. We test two photometric redshift codes, BPZ and EAZY, on each of two data sets and find that BPZ…
IDCS J1426.5+3508: The Most Massive Galaxy Cluster at z > 1.5
Eisenhardt, Peter R.; Gonzalez, Anthony H.; Stanford, S. A. +4 more
We present a deep (100 ks) Chandra observation of IDCS J1426.5+3508, a spectroscopically confirmed, infrared-selected galaxy cluster at z = 1.75. This cluster is the most massive galaxy cluster currently known at z > 1.5, based on existing Sunyaev-Zel’dovich (SZ) and gravitational lensing detections. We confirm this high mass via a variety of X…
A weak gravitational lensing recalibration of the scaling relations linking the gas properties of dark haloes to their mass
Wang, Wenting; White, Simon D. M.; Mandelbaum, Rachel +3 more
We use weak gravitational lensing to measure mean mass profiles around locally brightest galaxies (LBGs). These are selected from the Seventh Data Release of the Sloan Digital Sky Survey spectroscopic and photometric catalogues to be brighter than any neighbour projected within 1.0 Mpc and differing in redshift by <1000 km s-1. Most …
Effective field theory of dark matter: a global analysis
Calore, Francesca; Bertone, Gianfranco; Trotta, Roberto +4 more
We present global fits of an effective field theory description of real, and complex scalar dark matter candidates. We simultaneously take into account all possible dimension 6 operators consisting of dark matter bilinears and gauge invariant combinations of quark and gluon fields. We derive constraints on the free model parameters for both the re…
A Normal Supermassive Black Hole in NGC 1277
Marconi, Alessandro; Graham, Alister W.; Scott, Nicholas +5 more
The identification of galaxies with “overly massive” black holes requires two measurements: a black hole mass (Mbh) and a host spheroid mass ({M}{{sph,\ast }}). Here we provide our measurements for NGC 1277. Our structural decomposition reveals that NGC 1277 is dominated by a “classical” spheroid with a Sérsic index n = 5.3, …
Is there any evidence that ionized outflows quench star formation in type 1 quasars at z < 1?
Maiolino, R.; Marconi, A.; Brusa, M. +6 more
Aims: The aim of this paper is to test the basic model of negative active galactic nuclei (AGN) feedback. According to this model, once the central black hole accretes at the Eddington limit and reaches a certain critical mass, AGN driven outflows blow out gas, suppressing star formation in the host galaxy and self-regulating black hole growt…
Timing of the accreting millisecond pulsar SAX J1748.9-2021 during its 2015 outburst
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
We report on the timing analysis of the 2015 outburst of the intermittent accreting millisecond X-ray pulsar SAX J1748.9-2021 observed on March 4 by the X-ray satellite XMM-Newton. By phase connecting the time of arrivals of the observed pulses, we derived the best-fitting orbital solution for the 2015 outburst. We investigated the energy pulse pr…
A Hubble Space Telescope Survey for Novae in M87. I. Light and Color Curves, Spatial Distributions, and the Nova Rate
Welch, D. L.; Lauer, Tod R.; Mikołajewska, Joanna +6 more
The Hubble Space Telescope has imaged the central part of M87 over a 10 week span, leading to the discovery of 32 classical novae (CNe) and nine fainter, likely very slow, and/or symbiotic novae. In this first paper of a series, we present the M87 nova finder charts, and the light and color curves of the novae. We demonstrate that the rise and dec…
Joint resonant CMB power spectrum and bispectrum estimation
Meerburg, P. Daniel; Wandelt, Benjamin; Münchmeyer, Moritz
We develop the tools necessary to assess the statistical significance of resonant features in the CMB correlation functions, combining power spectrum and bispectrum measurements. This significance is typically addressed by running a large number of simulations to derive the probability density function (PDF) of the feature-amplitude in the Gaussia…