Search Publications
NuSTAR and XMM-Newton Observations of 1E1743.1-2843: Indications of a Neutron Star LMXB Nature of the Compact Object
Hailey, Charles J.; Mori, Kaya; Zhang, Shuo +13 more
We report on the results of NuSTAR and XMM-Newton observations of the persistent X-ray source 1E1743.1-2843, located in the Galactic Center region. The source was observed between 2012 September and October by NuSTAR and XMM-Newton, providing almost simultaneous observations in the hard and soft X-ray bands. The high X-ray luminosity points to the…
The Kinematics of the Nebular Shells Around Low Mass Progenitors of PNe with Low Metallicity
Richer, Michael G.; López, José Alberto; Pereyra, Margarita
We analyze the internal kinematics of 26 planetary nebulae (PNe) with low metallicity that appear to derive from progenitor stars of the lowest masses, including the halo PN population. Based upon spatially resolved, long-slit, echelle spectroscopy drawn from the San Pedro Mártir Kinematic Catalog of PNe, we characterize the kinematics of these PN…
Stellar classification of CoRoT targets
Deeg, H.; Deleuil, M.; Moutou, C. +4 more
Context. The CoRoT mission was the first dedicated to the search for exoplanets from space. The CoRoT exoplanet channel observed about 163 600 targets to detect transiting planetary companions. In addition to the search for exoplanets, the extremely precise photometric time series provided by CoRoT for this vast number of stars is an invaluable re…
High-angular-resolution stellar imaging with occultations from the Cassini spacecraft - III. Mira
Nicholson, Philip D.; Hedman, Matthew M.; Stewart, Paul N. +1 more
We present an analysis of spectral and spatial data of Mira obtained by the Cassini spacecraft, which not only observed the star's spectra over a broad range of near-infrared wavelengths, but was also able to obtain high-resolution spatial information by watching the star pass behind Saturn's rings. The observed spectral range of 1-5 microns revea…
The VIRUS-P Exploration of Nearby Galaxies (VENGA): Radial Gas Inflow and Shock Excitation in NGC 1042
Blanc, Guillermo A.; Jogee, Shardha; Luo, Rongxin +3 more
NGC 1042 is a late-type bulgeless disk galaxy that hosts low-luminosity active galactic nuclei (AGNs) coincident with a massive nuclear star cluster. In this paper, we present the integral field spectroscopy studies of this galaxy, based on the data obtained with the Mitchell spectrograph on the 2.7 m Harlan J. Smith telescope. In the central 100-…
Contamination in electron observations of the silicon detector on board Cluster/RAPID/IES instrument in Earth's radiation belts and ring current
Daly, P. W.; Klecker, B.; Pierrard, V. +10 more
Since more than 15 years, the Cluster mission passes through Earth's radiation belts at least once every 2 days for several hours, measuring the electron intensity at energies from 30 to 400 keV. These data have previously been considered not usable due to contamination caused by penetrating energetic particles (protons at >100 keV and electron…
The Putative Old, Nearby Cluster Lodén 1 Does Not Exist
Wright, Jason T.; Curtis, Jason L.; Han, Eunkyu
Astronomers have access to precious few nearby, middle-aged benchmark star clusters. Within 500 pc, there are only NGC 752 and Ruprecht 147 (R147) at 1.5 and 3 Gyr, respectively. The Database for Galactic Open Clusters (WEBDA) also lists Lodén 1 as a 2 Gyr cluster at a distance of 360 pc. If this is true, Lodén 1 could become a useful benchmark cl…
The Star Cluster Mass-Galactocentric Radius Relation: Implications for Cluster Formation
Fan, Zhou; de Grijs, Richard; Cameron, Ewan +1 more
Whether or not the initial star cluster mass function is established through a universal, galactocentric-distance-independent stochastic process, on the scales of individual galaxies, remains an unsolved problem. This debate has recently gained new impetus through the publication of a study that concluded that the maximum cluster mass in a given p…
Rosetta mission operations for landing
Accomazzo, Andrea; Lodiot, Sylvain; Companys, Vicente
The International Rosetta Mission of the European Space Agency (ESA) was launched on 2nd March 2004 on its 10 year journey to comet Churyumov-Gerasimenko and has reached it early August 2014. The main mission objectives were to perform close observations of the comet nucleus throughout its orbit around the Sun and deliver the lander Philae to its …
Constraining the escape fraction of ionizing photons from H II regions within NGC 300: A concept paper
Bastian, N.; Niederhofer, F.; Hilker, M. +1 more
Using broadband photometry from the Hubble Space Telescope in combination with Very Large Telescope narrowband Hα observations of the nearby spiral galaxy NGC 300, we explore a method for estimating the escape fractions of hydrogen-ionizing photons from H II regions within this galaxy. Our goal in this concept study is to evaluate the spectral typ…