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The SPoCA-suite: Software for extraction, characterization, and tracking of active regions and coronal holes on EUV images
Verbeeck, C.; Delouille, V.; Mampaey, B. +1 more
Context. Precise localization and characterization of active regions (AR) and coronal holes (CH) as observed by extreme ultra violet (EUV) imagers are crucial for a wide range of solar and helio-physics studies.
Aims: We introduce a set of segmentation procedures (known as the SPoCA-suite) that allows one to retrieve AR and CH properties on E…
The L-σ relation for massive bursts of star formation
Terlevich, E.; Terlevich, R.; Bresolin, F. +4 more
The validity of the emission-line luminosity versus ionized gas velocity dispersion (L-σ) correlation for H II galaxies (HIIGx) and its potential as an accurate distance estimator are assessed. For a sample of 128 local (0.02 ≲ z ≲ 0.2) compact HIIGx with high equivalent widths of their Balmer emission lines, we obtained the ionized gas velocity d…
How Dead are Dead Galaxies? Mid-infrared Fluxes of Quiescent Galaxies at Redshift 0.3 < z < 2.5: Implications for Star Formation Rates and Dust Heating
Franx, Marijn; Labbé, Ivo; Quadri, Ryan +17 more
We investigate star formation rates (SFRs) of quiescent galaxies at high redshift (0.3 < z < 2.5) using 3D-HST WFC3 grism spectroscopy and Spitzer mid-infrared data. We select quiescent galaxies on the basis of the widely used UVJ color-color criteria. Spectral energy distribution (SED) fitting (rest-frame optical and near-IR) indicates very…
Imaging and Spectroscopic Observations of a Filament Channel and the Implications for the Nature of Counter-streamings
Chen, P. F.; Harra, L. K.; Fang, C.
The dynamics of a filament channel are observed with imaging and spectroscopic telescopes before and during the filament eruption on 2011 January 29. The extreme ultraviolet (EUV) spectral observations reveal that there are no EUV counterparts of the Hα counter-streamings in the filament channel, implying that the ubiquitous Hα counter-streamings …
Constraints on modified Newtonian dynamics theories from radio tracking data of the Cassini spacecraft
Jacobson, R. A.; Folkner, W. M.; Hees, A. +1 more
The modified Newtonian dynamics (MOND) is an attempt to modify the gravitation theory to solve the dark matter problem. This phenomenology is very successful at the galactic level. The main effect produced by MOND in the Solar System is called the external field effect parametrized by the parameter Q2. We have used nine years of Cassini…
Intracluster Light at the Frontier: A2744
Trujillo, Ignacio; Montes, Mireia
The ultra-deep multiwavelength Hubble Space Telescope Frontier Fields coverage of the Abell Cluster 2744 is used to derive the stellar population properties of its intracluster light (ICL). The restframe colors of the ICL of this intermediate redshift (z = 0.3064) massive cluster are bluer (g - r = 0.68 ± 0.04; i - J = 0.56 ± 0.01) than those foun…
The Broadband Spectral Variability of MCG-6-30-15 Observed by NuSTAR and XMM-Newton
Harrison, F. A.; Cappi, M.; Guainazzi, M. +19 more
MCG-6-30-15, at a distance of 37 Mpc (z = 0.008), is the archetypical Seyfert 1 galaxy showing very broad Fe Kα emission. We present results from a joint NuSTAR and XMM-Newton observational campaign that, for the first time, allows a sensitive, time-resolved spectral analysis from 0.35 keV up to 80 keV. The strong variability of the source is best…
Confirmation of Circumstellar Phosphine
Teyssier, D.; Cernicharo, J.; Encrenaz, P. +2 more
Phosphine (PH3) was tentatively identified a few years ago in the carbon star envelopes IRC +10216 and CRL 2688 from observations of an emission line at 266.9 GHz attributable to the J = 1-0 rotational transition. We report the detection of the J = 2-1 rotational transition of PH3 in IRC +10216 using the HIFI instrument on bo…
The Albedo-Color Diversity of Transneptunian Objects
Lellouch, Emmanuel; Lacerda, Pedro; Guilbert-Lepoutre, Aurélie +9 more
We analyze albedo data obtained using the Herschel Space Observatory that reveal the existence of two distinct types of surface among midsized trans-Neptunian objects. A color-albedo diagram shows two large clusters of objects, one redder and higher albedo and another darker and more neutrally colored. Crucially, all objects in our sample located …
The ALHAMBRA Survey: Bayesian photometric redshifts with 23 bands for 3 deg
Cepa, J.; Infante, L.; Molino, A. +32 more
The Advance Large Homogeneous Area Medium-Band Redshift Astronomical (ALHAMBRA) survey has observed eight different regions of the sky, including sections of the Cosmic Evolution Survey (COSMOS), DEEP2, European Large-Area Infrared Space Observatory Survey (ELAIS), Great Observatories Origins Deep Survey North (GOODS-N), Sloan Digital Sky Survey (…