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Spitzer Observations of A1763. II. Constraining the Nature of Activity in the Cluster-feeding Filament with VLA and XMM-Newton Data
Fadda, Dario; Frayer, David T.; Durret, Florence +2 more
The A1763 superstructure at z = 0.23 contains the first galaxy filament to be directly detected using mid-infrared observations. Our previous work has shown that the frequency of starbursting galaxies, as characterized by 24 µm emission is much higher within the filament than at either the center of the rich galaxy cluster, or the field surr…
High-sensitivity Array Observations of the z = 1.87 Submillimeter Galaxy GOODS 850-3
Wang, Wei-Hao; Momjian, Emmanuel; Knudsen, Kirsten K. +3 more
We present sensitive phase-referenced Very Long Baseline Interferometry (VLBI) results on the radio continuum emission from the z = 1.87 luminous submillimeter galaxy (SMG) GOODS 850-3. The observations were carried out at 1.4 GHz using the High-Sensitivity Array (HSA). Our sensitive tapered VLBI image of GOODS 850-3 at 0farcs47 × 0farcs34 (3.9 × …
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. IV. 66 Andromedae, HR 6979, and HR 9059
Williamson, Michael H.; Fekel, Francis C.; Tomkin, Jocelyn
We have determined improved spectroscopic orbits for three double-lined binaries, 66 And (F4 V), HR 6979 (Am), and HR 9059 (F5 IV) using radial velocities from the 2.1 m telescope at McDonald Observatory, the coudé feed telescope at Kitt Peak National Observatory, and 2 m telescope at Fairborn Observatory. The orbital periods range from 11.0 to 14…
Imaging Carbon Monoxide Emission in the Starburst Galaxy NGC 6000
Wilner, David J.; Martín, Sergio; Espada, Daniel +1 more
We present measurements of carbon monoxide emission in the central region of the nearby starburst NGC 6000 taken with the Submillimeter Array. The J = 2-1 transition of 12CO, 13CO, and C18O were imaged at a resolution of ~3'' × 2'' (450 × 300 pc). We accurately determine the dynamical center of NGC 6000 at αJ2…
Nearby Spiral Galaxy Globular Cluster Systems. II. Globular Cluster Metallicities in NGC 300
Nantais, Julie B.; Huchra, John P.; Barmby, Pauline +1 more
We present new metallicity estimates for globular cluster (GC) candidates in the Sd spiral NGC 300, one of the nearest spiral galaxies outside the Local Group. We have obtained optical spectroscopy for 44 Sculptor Group GC candidates with the Boller and Chivens (B&C) spectrograph on the Baade Telescope at Las Campanas Observatory. There are tw…
The Tolman Surface Brightness Test for the Reality of the Expansion. V. Provenance of the Test and a New Representation of the Data for Three Remote Hubble Space Telescope Galaxy Clusters
Sandage, Allan
A new reduction is made of the Hubble Space Telescope (HST) photometric data for E galaxies in three remote clusters at redshifts near z = 0.85 in search for the Tolman surface brightness (SB) signal for the reality of the expansion. Because of the strong variation of SB of such galaxies with intrinsic size, and because the Tolman test is about SB…
First Orbit Solutions and Calculated Masses of 10 Visual Binaries
Ling, J. F.
This paper presents the first reported orbits and masses of 10 visual double stars, all of which have described arcs of less than 180° since the first observation: WDS 00209+1059 (BU 1093), WDS 02405 - 2408 (SEE 19), WDS 05289 - 0318 (DA 6), WDS 07347+3852 (HU 842 AB), WDS 07546 - 0248 (STF 1157), WDS 08127+2613 (A 2471), WDS 08456+8442 (A 1078), …
XMM-Newton Observations of the Enigmatic Long Period Eclipsing Binary Epsilon Aurigæ: Constraining the Physical Models
Wolk, Scott J.; Guinan, Edward; Pillitteri, Ignazio +1 more
We report on an XMM-Newton observation of the unusual, long period (F0 supergiant + cool disk companion) eclipsing binary star epsilon Aurigæ observed in X-rays prior to the onset of the 2009-2011 eclipse phase. While it appears certain that a disk-like body is obscuring the star, it remains unclear what kind of object is at the center of the disk…
Multiwavelength Observations of the Runaway Binary HD 15137
Gies, Douglas R.; Roettenbacher, Rachael M.; De Becker, Michaël +6 more
HD 15137 is an intriguing runaway O-type binary system that offers a rare opportunity to explore the mechanism by which it was ejected from the open cluster of its birth. Here, we present recent blue optical spectra of HD 15137 and derive a new orbital solution for the spectroscopic binary and physical parameters of the O star primary. We also pre…
Evidence for a Strong End-On Bar in the Ringed σ-Drop Galaxy NGC 6503
Nelson, T.; Chomiuk, L.; Freeland, E. +1 more
We use WIYN High-resolution Infrared Camera H-band (1.6 µm) imaging, archival Spitzer, Hubble Space Telescope, and Galaxy Evolution Explorer data simulations, and data from the literature to argue for the presence of a strong end-on bar in nearby spiral galaxy NGC 6503. The evidence consists of both photometric and kinematic signatures as we…