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Characterizing motion types of G-band bright points in the quiet Sun
Feng, Song; Wang, Feng; Deng, Hui +4 more
We study the motion of G-band bright points (GBPs) in the quiet Sun to obtain the characteristics of different motion types. A high resolution image sequence taken with the Hinode/Solar Optical Telescope (SOT) is used, and GBPs are automatically tracked by segmenting 3D evolutional structures in a space-time cube. After putting the GBPs that do no…
The two-colour EMCCD instrument for the Danish 1.54 m telescope and SONG
Christensen-Dalsgaard, J.; Andersen, M. F.; Grundahl, F. +13 more
We report on the implemented design of a two-colour instrument based on electron-multiplying CCD (EMCCD) detectors. This instrument is currently installed at the Danish 1.54 m telescope at ESO's La Silla Observatory in Chile, and will be available at the SONG (Stellar Observations Network Group) 1m telescope node at Tenerife and at other SONG node…
Stellar Mass Functions of Galaxies At 4 < z < 7 from an IRAC-selected Sample in Cosmos/Ultravista: Limits on the Abundance of Very Massive Galaxies
van Dokkum, Pieter G.; Muzzin, Adam; Labbé, Ivo +7 more
We build a Spitzer IRAC-complete catalog of objects complementing the Ks-band selected UltraVISTA catalog with objects detected in IRAC only. To identify massive (log ({{M}*}/{{M}⊙ })\gt 11) galaxies at 4\lt z\lt 7, we consider the systematic effects on photometric redshift measurements from the introduction of an …
Swift Ultraviolet Observations of Supernova 2014J in M82: Large Extinction from Interstellar Dust
Wang, Lifan; Krisciunas, Kevin; Siegel, Michael +8 more
We present optical and ultraviolet (UV) photometry and spectra of the very nearby and highly reddened supernova (SN) 2014J in M82 obtained with the Swift Ultra-Violet/Optical Telescope (UVOT). Comparison of the UVOT grism spectra of SN 2014J with Hubble Space Telescope observations of SN2011fe or UVOT grism spectra of SN 2012fr are consistent with…
The 2MIG isolated AGNs - I. General and multiwavelength properties of AGNs and host galaxies in the northern sky
Babyk, Iu.; Sawangwit, U.; Klimanov, S. +2 more
The host isolated galaxies with active galactic nuclei (AGNs) are unique for recognizing their internal multiwavelength properties and physical parameters of accretion on the supermassive black holes outside of the environment. For detaching these effects, we studied the galaxy sample obtained by cross-matching the 2MIG (2MASS isolated galaxy) cat…
Collisional modelling of the AU Microscopii debris disc
Krivov, A. V.; Löhne, T.; Marshall, J. P. +6 more
AU Microscopii's debris disc is one of the most famous and best-studied debris discs and one of only two resolved debris discs around M stars. We perform in-depth collisional modelling of the AU Mic disc including stellar radiative and corpuscular forces (stellar winds), aiming at a comprehensive understanding of the dust production and the dust a…
Simultaneous observation of a hot explosion by NST and IRIS
Yurchyshyn, Vasyl; Lim, Eun-Kyung; Yang, Heesu +9 more
We present the first simultaneous observations of so-called “hot explosions” in the cool atmosphere of the Sun made by the New Solar Telescope (NST) of Big Bear Solar Observatory and the Interface Region Imaging Spectrograph (IRIS) in space. The data were obtained during the joint IRIS-NST observations on 2014 July 30. The explosion of interest st…
Microwave background correlations from dipole anisotropy modulation
Aiola, Simone; Kosowsky, Arthur; Wang, Bingjie +2 more
Full-sky maps of the cosmic microwave background temperature reveal a 7% asymmetry of fluctuation power between two halves of the sky. A common phenomenological model for this asymmetry is an overall dipole modulation of statistically isotropic fluctuations, which produces particular off-diagonal correlations between multipole coefficients. We com…
Polarized galactic synchrotron and dust emission and their correlation
Choi, Steve K.; Page, Lyman A.
We present an analysis of the level of polarized dust and synchrotron emission using the WMAP9 and Planck data. The primary goal of this study is to inform the assessment of foreground contamination in the cosmic microwave background (CMB) measurements below ℓ ~ 200 from 23 to 353 GHz. We compute angular power spectra as a function of sky cut base…
Refining the Associations of the Fermi Large Area Telescope Source Catalogs
Smith, Howard A.; Masetti, N.; Jiménez-Bailón, E. +10 more
The Fermi-Large Area Telescope (LAT) First Source Catalog (1FGL) was released in 2010 February and the Fermi-LAT 2-Year Source Catalog (2FGL) appeared in 2012 April, based on data from 24 months of operation. Since they were released, many follow up observations of unidentified γ-ray sources have been performed and new procedures for associating γ…