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The Nature of the Bright ULX X-2 in NGC 3921: A Chandra Position and HST Candidate Counterpart
Fabian, A. C.; Miniutti, G.; Miller-Jones, J. C. A. +6 more
We report on Chandra observations of the bright ultraluminous X-ray (ULX) source in NGC 3921. Previous XMM-Newton observations reported in the literature show the presence of a bright ULX at a 0.5-10 keV luminosity of 2 × 1040 erg s-1. Our Chandra observation finds the source at a lower luminosity of ≈8 × 1039 erg …
Determination of the Heliospheric Radial Magnetic Field from the Standoff Distance of a CME-driven Shock Observed by the STEREO Spacecraft
Gopalswamy, Nat; Yashiro, Seiji; Kwon, Ryun-Young +2 more
We report on the determination of radial magnetic field strength in the heliocentric distance range from 6 to 120 solar radii (R ⊙) using data from Coronagraph 2 (COR2) and Heliospheric Imager I (HI1) instruments on board the Solar Terrestrial Relations Observatory spacecraft following the standoff-distance method of Gopalswamy & Ya…
Discovery of a Kiloparsec-scale X-Ray/Radio Jet in the z = 4.72 Quasar GB 1428+4217
Cheung, C. C.; Stawarz, Ł.; Siemiginowska, A. +4 more
We report the discovery of a one-sided 3farcs6 (24 kpc, projected) long jet in the high-redshift, z = 4.72, quasar GB 1428+4217 in new Chandra X-ray and Very Large Array (VLA) radio observations. This is the highest redshift kiloparsec-scale X-ray/radio jet known. Analysis of archival very long baseline interferometry 2.3 and 8.6 GHz data reveal a…
Titan's Methane Weather
Roe, Henry G.
Conditions in Titan's troposphere are near the triple point of methane, the second most abundant component of its atmosphere. Our understanding of Titan's lower atmosphere has shifted considerably in the past decade. Ground-based observations, Hubble Space Telescope images, and data returned from the Cassini and Huygens spacecraft show that Titan'…
A Search for an Intermediate-mass Black Hole in the Core of the Globular Cluster NGC 6266
Harrison, Thomas E.; Baumgardt, Holger; McNamara, Bernard J. +1 more
It has long been thought that intermediate-mass black holes (IMBHs) might be located in the cores of globular clusters. However, studies attempting to confirm this possibility have been inconclusive. To refine the search for these objects, Baumgardt et al. completed a series of N-body simulations to determine the observational properties that a ho…
Elemental Abundances in the Possible Type Ia Supernova Remnant G344.7-0.1
Yamaguchi, H.; Tanaka, M.; Maeda, K. +5 more
Recent studies on the Galactic supernova remnant (SNR) G344.7-0.1 have commonly claimed its origin to be a core-collapse supernova (SN) explosion, based on its highly asymmetric morphology and/or proximity to a star-forming region. In this paper, however, we present an X-ray spectroscopic study of this SNR using Suzaku, which is supportive of a Ty…
Compositional investigation of the proposed chloride-bearing materials on Mars using near-infrared orbital data from OMEGA/MEx
Bibring, Jean-Pierre; Gondet, Brigitte; Poulet, François +7 more
Several hundred occurrences of chloride-bearing salt deposits have been proposed in terrains within the southern highlands of Mars on the basis of Thermal Emission Imaging System and Thermal Emission Spectrometer infrared observations. The spectral identification of chloride salts by remote sensing is challenging because they are transparent over …
X-ray Multi-mirror Mission (XMM-Newton) observatory
Schartel, Norbert; Lumb, David H.; Jansen, Fred A.
X-ray Multi-mirror Mission (XMM-Newton) has been one of the most successful astronomy missions launched by the European Space Agency. The mission exploits innovative use of replication technology for the x-ray reflecting telescopes that has resulted in an unprecedented combination of effective area and resolution. Three telescopes are equipped wit…
Deep Chandra Monitoring Observations of NGC 4649. II. Wide-field Hubble Space Telescope Imaging of the Globular Clusters
Brodie, Jean P.; Zezas, Andreas; Strader, Jay +7 more
We present g and z photometry and size estimates for globular clusters (GCs) in the massive Virgo elliptical NGC 4649 (M60) using a five-pointing Hubble Space Telescope/Advanced Camera for Surveys mosaic. The metal-poor GCs show a monotonic negative metallicity gradient of -0.43 ± 0.10 dex per dex in radius over the full radial range of the data, …
A Calibrated Measurement of the Near-IR Continuum Sky Brightness Using Magellan/FIRE
Simcoe, Robert A.; Sullivan, Peter W.
We characterize the near-IR sky background from 308 observations with the Folded-port InfraRed Echellette (FIRE) spectrograph at Magellan. A subset of 105 observations selected to minimize lunar and thermal effects gives a continuous, median spectrum from 0.83 to 2.5 µm, which we present in Table 2. The data are used to characterize the broa…