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Detecting Variability in Massive Astronomical Time-series Data. II. Variable Candidates in the Northern Sky Variability Survey
Chang, Seo-Won; Kim, Dae-Won; Byun, Yong-Ik +2 more
We present variability analysis of data from the Northern Sky Variability Survey (NSVS). Using the clustering method, which defines variable candidates as outliers from large clusters, we cluster 16,189,040 light curves having data points at more than 15 epochs as variable and non-variable candidates in 638 NSVS fields. Variable candidates are sel…
Parametrization effects in the analysis of AMI Sunyaev-Zel'dovich observations
AMI Consortium; Olamaie, Malak; Rodríguez-Gonzálvez, Carmen +16 more
Most Sunyaev-Zel'dovich (SZ) and X-ray analyses of galaxy clusters try to constrain the cluster total mass (MT(r)) and/or gas mass (Mg(r)) using parametrized models derived from both simulations and imaging observations, and assumptions of spherical symmetry and hydrostatic equilibrium. By numerically exploring the probabilit…
The ChaMPlane Bright X-Ray Sources—Galactic Longitudes l = 2°-358°
Penner, Kyle; Laycock, Silas; van den Berg, Maureen +4 more
The Chandra Multi-wavelength Plane (ChaMPlane) survey aims to constrain the Galactic population of mainly accretion-powered, but also coronal, low-luminosity X-ray sources (L X <~ 1033 erg s-1). To investigate the X-ray source content in the plane at fluxes F X >~ 3 × 10-14 erg s-1<…
The Suzaku X-ray spectrum of NGC 3147. Further insights on the best "true" Seyfert 2 galaxy candidate
Bianchi, S.; Guainazzi, M.; Barcons, X. +2 more
Context. NGC 3147 is so far the most convincing case of a "true" Seyfert 2 galaxy, i.e. a source genuinely lacking the broad line regions.
Aims: We obtained a Suzaku observation with the double aim to study in more detail the iron line complex, and to check the Compton-thick hypothesis for the lack of observed optical broad lines.
Method…
The unseen population of F- to K-type companions to hot subdwarf stars
Gänsicke, B. T.; Heber, U.; Breedt, E. +6 more
We present a method to select hot subdwarf stars with A- to M-type companions using photometric selection criteria. We cover a wide range in wavelength by combining Galaxy Evolution Explorer (GALEX) ultraviolet data, optical photometry from the Sloan Digital Sky Survey (SDSS) and the Carlsberg Meridian Telescope, near-infrared data from Two-Micron…
The structures of distant galaxies - V. The evolution of galaxy structure in stellar mass at z<1
Conselice, C. J.; Lanyon-Foster, M. M.; Merrifield, M. R.
The structure and morphology of a galaxy are nearly always studied using the light originating from stars; however, ideally one is interested in measuring structure using the stellar mass distribution. Not only does stellar mass trace out the underlying distribution of matter, it also minimizes the effects of star formation and dust on the appeara…
DASCH Discovery of a Possible Nova-like Outburst in a Peculiar Symbiotic Binary
Quinn, Samuel N.; Orosz, Jerome A.; Grindlay, Jonathan E. +4 more
We present photometric and spectroscopic observations of a peculiar variable (designated DASCH J075731.1+201735 or J0757) discovered from our DASCH project using the digitized Harvard College Observatory archival photographic plates. It brightened by about 1.5 mag in B within a year starting in 1942, and then slowly faded back to its pre-outburst …
High spatial resolution VAULT H-Lyα observations and multiwavelength analysis of an active region filament
Vial, J. -C.; Yurchyshyn, V.; Vourlidas, A. +2 more
Context. The search for the fine structure of prominences has received considerable new attention thanks to the Swedish Solar Telescope (SST) Hα pictures that provide an unsurpassed spatial resolution. Recently, it has been shown that the filaments' coronal environment, at least for quiescent filaments, is perturbed by either cool absorbing materi…
Spatial matter density mapping of the STAGES Abell A901/2 supercluster field with 3D lensing
Simon, P.; Heymans, C.; Schrabback, T. +13 more
We present weak lensing data from the Hubble Space Telescope(HST)/Space Telescope A901/902 Galaxy Evolution Survey (STAGES) survey to study the three-dimensional spatial distribution of matter and galaxies in the Abell 901/902 supercluster complex. Our method improves over the existing 3D lensing mapping techniques by calibrating and removing reds…
Atomic hydrogen, star formation and feedback in the lowest mass blue compact dwarf galaxies
Chiboucas, Kristin; Tully, R. Brent; Karachentsev, Igor D. +3 more
We present the results from a search for H I emission from a sample of newly discovered dwarf galaxies in the M81 group. H I is detected in three galaxies, all of which are classified as blue compact dwarf galaxies (BCDs). The H I masses of these galaxies are ∼106 M⊙, making them some of the lowest mass BCDs known. For these …