Search Publications
Excitation of H2 in photodissociation regions as seen by Spitzer
Boulanger, F.; Abergel, A.; Le Bourlot, J. +5 more
Aims: We present spectroscopic observations obtained with the infrared Spitzer Space Telescope, which provide insight into the H2 physics and gas energetics in photodissociation regions (PDRs) of low to moderate far-ultraviolet (FUV) fields and densities.
Methods: We analyze data on six well known Galactic PDRs (L1721, Califor…
A high-amplitude thermal inertia anomaly of probable magnetospheric origin on Saturn's moon Mimas
Johnson, R. E.; Paranicas, C.; Spencer, J. R. +5 more
Spectral maps of Mimas' daytime thermal emission show a previously unobserved thermal anomaly on Mimas' surface. A sharp V-shaped boundary, centered at 0°N and 180°W, separates relatively warm daytime temperatures from a cooler anomalous region occupying low- to mid-latitudes on the leading hemisphere. Subsequent observations show the anomalous re…
Identifying XMM-Newton observations affected by solar wind charge exchange - Part II
Read, A. M.; Carter, J. A.; Sembay, S.
Aims: We wished to analyse a sample of observations from the XMM-Newton Science Archive to search for evidence of exospheric solar wind charge exchange (SWCX) emission.
Methods: We analysed 3012 observations up to and including revolution 1773. The method employed extends from that of the previously published paper by these authors on th…
Regional geomorphology and history of Titan's Xanadu province
Lorenz, R. D.; West, R. D.; Stiles, B. +19 more
Titan's enigmatic Xanadu province has been seen in some detail with instruments from the Cassini spacecraft. The region contains some of the most rugged, mountainous terrain on Titan, with relief over 2000 m. Xanadu contains evolved and integrated river channels, impact craters, and dry basins filled with smooth, radar-dark material, perhaps sedim…
SDSS J0926+3624: the shortest period eclipsing binary star
Drake, A. J.; Gänsicke, B. T.; Dhillon, V. S. +12 more
With orbital periods of the order of tens of minutes or less, the AM Canum Venaticorum stars are ultracompact, hydrogen-deficient binaries with the shortest periods of any binary subclass, and are expected to be among the strongest gravitational wave sources in the sky. To date, the only known eclipsing source of this type is the P= 28 min binary …
Statistical survey on the magnetic structure in magnetotail current sheets
Petrukovich, A. A.; Zhang, T. L.; Lucek, E. +5 more
On the basis of the multipoint magnetic observations of Cluster in the region 15-19 RE downtail, the magnetic field structure in magnetotail current sheet (CS) center is statistically surveyed. It is found that the By component (in GSM coordinates) is distributed mainly within ∣By∣ < 5nT, while the Bz…
The Evolution of the Mass-Size Relation to z = 3.5 for UV-bright Galaxies and Submillimeter Galaxies in the GOODS-North Field
Franx, Marijn; Kriek, Mariska; Williams, Rik J. +1 more
We study the evolution of the size-stellar mass relation for a large spectroscopic sample of galaxies in the GOODS-North field up to z ~ 3.5. The sizes of the galaxies are measured from Ks -band images (corresponding to rest-frame optical/NIR) from the Subaru 8 m telescope. We reproduce earlier results based on photometric redshifts tha…
Galaxy number counts and implications for strong lensing
Koopmans, L. V. E.; Fassnacht, C. D.; Wong, K. C.
We compare galaxy number counts in Advanced Camera for Surveys (ACS) fields containing moderate-redshift (0.2 < z < 1.0) strong gravitational lenses with those in two control samples: (1) the first square degree of the COSMOS survey, comprising 259 ACS fields and (2) 20 ‘pure-parallel’ fields randomly located on the sky. Through a Bayesian a…
Photometric Determination of the Mass Accretion Rates of Pre-main-sequence Stars. II. NGC 346 in the Small Magellanic Cloud
Panagia, Nino; Sabbi, Elena; De Marchi, Guido +4 more
We have studied the properties of the stellar populations in the field of the NGC 346 cluster in the Small Magellanic Cloud, using a novel self-consistent method that allows us to reliably identify pre-main-sequence (PMS) objects actively undergoing mass accretion, regardless of their age. The method does not require spectroscopy and combines broa…
Ejection velocities of high Galactic latitude runaway stars
Napiwotzki, R.; Silva, M. D. V.
We estimate the distribution of ejection velocities for the known population of high Galactic latitude runaway stars. The initial sample is a collection of 174 early-type stars selected from the literature. The stars are first classified according to their evolutionary status in order to obtain a homogeneous sample of 96 genuine main-sequence star…