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Deep Multi-telescope Photometry of NGC 5466. II. The Radial Behavior of the Mass Function Slope
Dalessandro, E.; Bellazzini, M.; Beccari, G. +3 more
We use a combination of data acquired with the Advanced Camera for Survey on board the Hubble Space Telescope and the Large Binocular Camera (LBC-blue) mounted on the Large Binocular Telescope to sample the main sequence (MS) stars of the globular cluster (GC) NGC 5466 in the mass range 0.3 < M/M⊙ < 0.8. We derive the cluster's Lu…
Initiation of CMEs associated with filament eruption, and the nature of CME related shocks
Fainshtein, V. G.; Egorov, Ya. I.
Using data from SDO, PROBA2 and other spacecraft, Fainshtein and Egorov (2013) have discovered processes accompanying initiation of six limb CMEs and have studied features of their motion. The said CMEs occurred after eruption of prominence or hot emission loop and were associated with X-ray flares. The follow-up study of the CMEs, associated with…
A study of purely astrometric selection of extragalactic point sources with Gaia
Fynbo, J. P. U.; Heintz, K. E.; Høg, E.
Context. Selection of extragalactic point sources, e.g., quasi-stellar objects (QSOs), is often hampered by significant selection effects causing existing samples to have rather complex selection functions.
Aims: We explore whether a purely astrometric selection of extragalactic point sources, e.g., QSOs, is feasible with the ongoing Gaia mis…
A string-inspired model for the low-ℓ CMB
Sagnotti, A.; Kitazawa, N.
We present a semi-analytic exploration of some low-ℓ angular power spectra inspired by “brane supersymmetry breaking (BSB)”. This mechanism splits Bose and Fermi excitations in string theory, leaving behind an exponential potential that is just too steep for the inflaton to emerge from the initial singularity while descending it. As a result, the …
Coronal energy input and dissipation in a solar active region 3D MHD model
Peter, H.; Bingert, S.; Bourdin, Ph. -A.
Context. We have conducted a 3D MHD simulation of the solar corona above an active region (AR) in full scale and high resolution, which shows coronal loops, and plasma flows within them, similar to observations.
Aims: We want to find the connection between the photospheric energy input by field-line braiding with the coronal energy conversion…
The Distance Measurement of NGC 1313 with Cepheids
Wang, Wei; Yoachim, Peter; Liu, Ji-Feng +1 more
We present the detection of Cepheids in the barred spiral galaxy NGC 1313, using the Wide Field and Planetary Camera 2 on the Hubble Space Telescope. Twenty B(F450W) and V(F555W) epochs of observations spanning over three weeks were obtained, on which the profile-fitting photometry of all stars in the monitored field was performed using the packag…
H2 Lyman and Werner band lines and their sensitivity for a variation of the proton-electron mass ratio in the gravitational potential of white dwarfs
Roueff, E.; Abgrall, H.; Bagdonaite, J. +2 more
Recently we published an accurate analysis of molecular hydrogen absorption in the photospheres of the white dwarf stars GD133 and GD29-38, previously observed with the Cosmic Origins Spectrograph aboard the Hubble Space Telescope. Constraints were derived on a possible dependence of the proton-electron mass ratio on gravitational fields that are …
Solar-cycle variations of the internetwork magnetic field
Faurobert, M.; Ricort, G.
Context. The quiet Sun exhibits a rich and complex magnetic structuring that is still not fully resolved or understood.
Aims: We intend to contribute to the debate about the origin of the internetwork magnetic fields and whether or not they are related to the global solar dynamo.
Methods: We analyzed center-to-limb polarization measureme…
Further evidence for the role of magnetotail current shape in substorm initiation
Kubyshkina, D.; Gordeev, E.; Tsyganenko, N. +3 more
Substorm initiation still remains an unsolved problem, even though there is a consensus among most researchers that its main stages include dayside reconnection and substorm expansion. Dayside reconnection results in magnetotail flux buildup to a certain critical level, after which [or after the interplanetary magnetic field (IMF) Bz turns northwa…
Dissecting the Power Sources of Low-Luminosity Emission-Line Galaxy Nuclei via Comparison of HST-STIS and Ground-Based Spectra
Filippenko, Alexei V.; Ho, Luis C.; Shields, Joseph C. +3 more
Using a sample of ∼100 nearby line-emitting galaxy nuclei, we have built the currently definitive atlas of spectroscopic measurements of Hα and neighboring emission lines at subarcsecond scales. We employ these data in a quantitative comparison of the nebular emission in Hubble Space Telescope (HST) and ground-based apertures, which offer an order…