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The Solar Internetwork. II. Flux Appearance and Disappearance Rates
Gošić, M.; Bellot Rubio, L. R.; Katsukawa, Y. +2 more
Small-scale internetwork magnetic fields are important ingredients of the quiet Sun. In this paper we analyze how they appear and disappear on the solar surface. Using high resolution Hinode magnetograms, we follow the evolution of individual magnetic elements in the interior of two supergranular cells at the disk center. From up to 38 hr of conti…
Radial Profile of the 3.5 keV Line Out to R200 in the Perseus Cluster
Boyarsky, Alexey; Ruchayskiy, Oleg; Bulbul, Esra +10 more
The recent discovery of the unidentified emission line at 3.5 keV in galaxies and clusters has attracted great interest from the community. As the origin of the line remains uncertain, we study the surface brightness distribution of the line in the Perseus cluster since that information can be used to identify its origin. We examine the flux distr…
Toward a Tomographic Analysis of the Cross-Correlation between Planck CMB Lensing and H-ATLAS Galaxies
Baccigalupi, C.; Bielewicz, P.; Danese, L. +10 more
We present an improved and extended analysis of the cross-correlation between the map of the cosmic microwave background (CMB) lensing potential derived from the Planck mission data and the high-redshift galaxies detected by the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) in the photometric redshift range {z}{{ph}}≥slan…
An HST Survey of the Highest-velocity Ejecta in Cassiopeia A
Milisavljevic, Dan; Fesen, Robert A.
We present Hubble Space Telescope WFC3/IR images of the Cassiopeia A supernova remnant that survey its high-velocity, S-rich debris in the NE jet and SW counterjet regions through [S III] λλ9069, 9531 and [S II] λλ10,287-10,370 line emissions. We identify nearly 3400 sulfur emitting knots concentrated in ∼120° wide opposing streams, almost triple …
Constraining Globular Cluster Age Uncertainties using the IR Color-Magnitude Diagram
Brown, Thomas M.; Gennaro, Mario; Calamida, Annalisa +2 more
Globular Clusters (GCs) in the Milky Way are the primary laboratories for establishing the ages of the oldest stellar populations and for measuring the color-magnitude relation of stars. In infrared (IR) color-magnitude diagrams (CMDs), the stellar main sequence (MS) exhibits a “kink” due to opacity effects in M dwarfs such that lower mass and coo…
The Phase Space of z∼1.2 SpARCS Clusters: Using Herschel to Probe Dust Temperature as a Function of Environment and Accretion History
Muzzin, A.; van der Burg, R. F. J.; Wilson, G. +5 more
We present a five-band Herschel study (100-500 µm) of three galaxy clusters at z∼ 1.2 from the Spitzer Adaptation of the Red-Sequence Cluster Survey. With a sample of 120 spectroscopically confirmed cluster members, we investigate the role of environment on galaxy properties utilizing the projected cluster phase space (line-of-sight velocity…
Galaxies Probing Galaxies at High Resolution: Co-rotating Gas Associated with a Milky Way Analog at z=0.4
Moustakas, John; Coil, Alison L.; Tremonti, Christy A. +5 more
We present results on gas flows in the halo of a Milky-Way-like galaxy at z = 0.413 based on high-resolution spectroscopy of a background galaxy. This is the first study of circumgalactic gas at high spectral resolution toward an extended background source (I.e., a galaxy rather than a quasar). Using long-slit spectroscopy of the foreground galaxy…
The Hot Companion and Circumbinary Disk of the Be Star HR 2142
Gies, Douglas R.; Wang, Luqian; Peters, Geraldine J. +1 more
We present a spectroscopic investigation of the Be+sdO binary system HR 2142 that is based upon large sets of ultraviolet observations from the International Ultraviolet Explorer (IUE) and ground-based Hα observations. We measured radial velocities for the Be star component from these spectra and computed a revised orbit. In order to search for th…
A New γ-Ray Loud, Eclipsing Low-mass X-Ray Binary
Strader, Jay; Udalski, Andrzej; Chomiuk, Laura +5 more
We report the discovery of an eclipsing low-mass X-ray binary at the center of the 3FGL error ellipse of the unassociated Fermi/Large Area Telescope γ-ray source 3FGL J0427.9-6704. Photometry from OGLE and the SMARTS 1.3 m telescope and spectroscopy from the SOAR telescope have allowed us to classify the system as an eclipsing low-mass X-ray binar…
The Fe II Emission in Active Galactic Nuclei: Excitation Mechanisms and Location of the Emitting Region
Garcia-Rissmann, A.; Sigut, T. A. A.; Rodríguez-Ardila, A. +2 more
We present a study of Fe II emission in the near-infrared region (NIR) for 25 active galactic nuclei (AGNs) to obtain information about the excitation mechanisms that power it and the location where it is formed. We employ an NIR Fe II template derived in the literature and find that it successfully reproduces the observed Fe II spectrum. The Fe I…