Search Publications
Absorption at 11 µm in the interstellar medium and embedded sources: evidence for crystalline silicates
Wright, Christopher M.; Do Duy, Tho; Lawson, Warrick
An absorption feature is occasionally reported around 11 µm in astronomical spectra, including those of forming stars. Candidate carriers include water ice, polycyclic aromatic hydrocarbons, silicon carbide, crystalline silicates or even carbonates. All are known constituents of cosmic dust in one or more types of environments, though not ne…
Bayesian analysis of two stellar populations in Galactic globular clusters- III. Analysis of 30 clusters
Jefferys, W. H.; Stenning, D. C.; Wagner-Kaiser, R. +5 more
We use Cycle 21 Hubble Space Telescope (HST) observations and HST archival ACS Treasury observations of 30 Galactic globular clusters to characterize two distinct stellar populations. A sophisticated Bayesian technique is employed to simultaneously sample the joint posterior distribution of age, distance, and extinction for each cluster, as well a…
Nereid from space: rotation, size and shape analysis from K2, Herschel and Spitzer observations
Pál, A.; Molnár, L.; Müller, T. G. +8 more
In this paper, we present an analysis of K2 mission Campaign 3 observations of the irregular Neptune satellite, Nereid. We determined a rotation period of P = 11.594±0.017 h and amplitude of Δm = 0.0328m ± 0.0018m, confirming previous short rotation periods obtained in ground-based observations. The similarities of light-curve amplitudes between 2…
Luminosity-dependent change of the emission diagram in the X-ray pulsar 4U 1626-67
Gilfanov, Marat; Koliopanos, Filippos
We detect variability of the Fe K α emission line in the spectrum of X-ray pulsar 4U 1626-67, correlated with changes in its luminosity and in the shape of its pulse profile. Analysis of archival Chandra and RXTE observations revealed the presence of an intrinsically narrow Fe K α emission line in the spectrum obtained during the source's current …
Hektor - an exceptional D-type family among Jovian Trojans
Nesvorný, D.; Brož, M.; Durda, D. D. +4 more
In this work, we analyse Jovian Trojans in the space of suitable resonant elements and we identify clusters of possible collisional origin by two independent methods: the hierarchical clustering and a so-called randombox. Compared to our previous work, we study a twice larger sample. Apart from Eurybates, Ennomos and 1996 RJ families, we have foun…
Baryon content and dynamic state of galaxy clusters: XMM-Newton observations of A1095 and A1926
Tripp, Todd M.; Wang, Q. Daniel; Li, Zhiyuan +3 more
We have initiated a program to study the baryon content and dynamic state of galaxy clusters. Here we present results primarily from XMM-Newton observations of two optically selected galaxy clusters, A1095 (z ≃ 0.210) and A1926 (z ≃ 0.136). We find that both of them are actually cluster pairs at similar redshifts. We characterize the temperatures …
Submillimeter array observations of NGC 2264-C: molecular outflows and driving sources
Lumsden, Stuart L.; Cunningham, Nichol; Cyganowski, Claudia J. +2 more
We present 1.3 mm Submillimeter Array (SMA) observations at ∼3 arcsec resolution towards the brightest section of the intermediate/massive star-forming cluster NGC 2264-C. The millimetre continuum emission reveals ten 1.3 mm continuum peaks, of which four are new detections. The observed frequency range includes the known molecular jet/outflow tra…
Mid-infrared imaging- and spectro-polarimetric subarcsecond observations of NGC 1068
Esquej, P.; Telesco, C. M.; Díaz-Santos, T. +10 more
We present subarcsecond 7.5-13 µm imaging- and spectro-polarimetric observations of NGC 1068 using CanariCam on the 10.4-m Gran Telescopio CANARIAS. At all wavelengths, we find: (1) A 90 × 60 pc extended polarized feature in the northern ionization cone, with a uniform ∼44° polarization angle. Its polarization arises from dust and gas emissi…
Comparative study of water ice exposures on cometary nuclei using multispectral imaging data
Jorda, L.; Lamy, P. L.; Lara, L. M. +48 more
Deep Impact, EPOXI and Rosetta missions visited comets 9P/Tempel 1, 103P/Hartley 2 and 67P/Churyumov-Gerasimenko, respectively. Each of these three missions was equipped with both multispectral imagers and infrared spectrometers. Bright blue features containing water ice were detected in each of these comet nuclei. We analysed multispectral proper…
Diffuse low-ionization gas in the galactic halo casts doubts on z ≃ 0.03 WHIM detections
Piro, L.; Elvis, M.; Nicastro, F. +4 more
In this Letter, we demonstrate that the two claims of z ≃ 0.03 O VII K α absorption lines from Warm Hot Intergalactic Medium (WHIM) along the lines of sight to the blazars H 2356-309 (Buote et al.; Fang et al.) and Mkn 501 (Ren, Fang & Buote) are likely misidentifications of the z = 0 O II K β line produced by a diffuse Low-Ionization Metal Me…