Search Publications
The Evolution of Bulge-dominated Field Galaxies from z ≈ 1 to the Present
Jørgensen, Inger; Woodrum, Charity; Demarco, Ricardo +4 more
We analyze the stellar populations and evolutionary history of bulge-dominated field galaxies at redshifts 0.3< z< 1.2 as part of the Gemini/Hubble Space Telescope (HST) Galaxy Cluster Project (GCP). High signal-to-noise optical spectroscopy from the Gemini Observatory and imaging from the HST are used to analyze a total of 43 galaxies, focu…
Upper limit of helium-4 in the sunlit lunar exosphere during magnetotail passage under low solar wind condition: Result from CHACE aboard MIP in Chandrayaan-1
Bhardwaj, Anil; Sridharan, R.; Dhanya, M. B. +3 more
The outcome of efforts to detect He-4 in the sunlit lunar exosphere as evinced by the CHACE mass spectrometer aboard the Moon Impact Probe in Chandrayaan-1 is reported. The in situ observations by CHACE were carried out in the lunar dayside, covering a broad range of lunar latitudes, when the Moon was on the verge of exiting the Earth's magnetotai…
A jet-dominated model for a broad-band spectral energy distribution of the nearby low-luminosity active galactic nucleus in M94
Connors, Riley; McHardy, Ian; Markoff, Sera +4 more
We have compiled a new multiwavelength spectral energy distribution (SED) for the closest obscured low-ionization emission-line region active galactic nucleus (AGN), NGC 4736, also known as M94. The SED comprises mainly high-resolution (mostly sub-arcsecond, or, at the distance to M94, ≲23 pc from the nucleus) observations from the literature, arc…
Spectroscopic classification of X-ray sources in the Galactic Bulge Survey
Maccarone, T. J.; Udalski, A.; Kostrzewa-Rutkowska, Z. +14 more
We present the classification of 26 optical counterparts to X-ray sources discovered in the Galactic Bulge Survey. We use (time-resolved) photometric and spectroscopic observations to classify the X-ray sources based on their multiwavelength properties. We find a variety of source classes, spanning different phases of stellar/binary evolution. We …
Local properties of the large-scale peaks of the CMB temperature
Martínez-González, E.; Vielva, P.; Marcos-Caballero, A.
In the present work, we study the largest structures of the CMB temperature measured by Planck in terms of the most prominent peaks on the sky, which, in particular, are located in the southern galactic hemisphere. Besides these large-scale features, the well-known Cold Spot anomaly is included in the analysis. All these peaks would contribute sig…
The active nucleus of the ULIRG IRAS F00183-7111 viewed by NuSTAR
Vignali, C.; Gilli, R.; Piconcelli, E. +6 more
We present an X-ray study of the ultra-luminous infrared galaxy IRAS F00183-7111 (z = 0.327), using data obtained from NuSTAR, Chandra X-ray Observatory, Suzaku and XMM-Newton. The Chandra imaging shows that a point-like X-ray source is located at the nucleus of the galaxy at energies above 2 keV. However, the point source resolves into diffuse em…
Oversampled Pulse Compression Based on Signal Modeling: Application to CONSERT/Rosetta Radar
Kofman, Wlodek; Herique, Alain; Pasquero, Oudomsack Pierre
Thermal Pressure in Diffuse H2 Gas Measured by Herschel [C II] Emission and FUSE UV H2 Absorption
Goldsmith, P. F.; Langer, W. D.; Pineda, J. L. +1 more
UV absorption studies with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite have made important observations of H2 molecular gas in Galactic interstellar translucent and diffuse clouds. Observations of the 158 µm [C II] fine-structure line with Herschel trace the same H2 molecular gas in emission. We present …
Solar Illumination Control of the Polar Wind
André, M.; Poedts, S.; Eriksson, A. I. +5 more
Polar wind outflow is an important process through which the ionosphere supplies plasma to the magnetosphere. The main source of energy driving the polar wind is solar illumination of the ionosphere. As a result, many studies have found a relation between polar wind flux densities and solar EUV intensity, but less is known about their relation to …
An investigation of four chemically peculiar stars with photometric periods below 12 h
Paunzen, Ernst; Hambsch, Franz-Josef; Hümmerich, Stefan +3 more
We present an investigation of three chemically peculiar (CP) stars and one CP star candidate that exhibit photometric periods below 12 h. New spectroscopic observations have been acquired that confirm the peculiar nature of all objects. HD 77013 and HD 81076 are classical CP1 (Am) stars, HD 67983 is a marginal CP1 (Am:) star and HD 98000 is a CP2…