Search Publications
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…
Optical counterparts of two ULXs in NGC 5474 and NGC 3627 (M 66)
Akyuz, A.; Aksaker, N.; Avdan, S. +6 more
We identified two optical counterparts of brightest ultraluminous X-ray sources (ULXs) in galaxies NGC 5474 and NGC 3627 (M66). The counterparts in Hubble Space Telescope images are very faint, their V magnitudes are 24.7 (MV ≈ -4.5) and 25.9 (MV ≈ -4.2), respectively. NGC 5474 X-1 changes the X-ray flux more than two orders …
Interpreting the ionization sequence in star-forming galaxy emission-line spectra
Ferland, Gary J.; Hewett, Paul C.; Baldwin, Jack A. +4 more
High-ionization star-forming (SF) galaxies are easily identified with strong emission-line techniques such as the BPT diagram, and form an obvious ionization sequence on such diagrams. We use a locally optimally emitting cloud model to fit emission-line ratios that constrain the excitation mechanism, spectral energy distribution, abundances and ph…
The nuclear and integrated far-infrared emission of nearby Seyfert galaxies
Esquej, P.; Hernán-Caballero, A.; Acosta-Pulido, J. A. +11 more
We present far-infrared (FIR) 70-500 µm imaging observations obtained with Herschel/Photodetector Array Camera (PACS) and Spectral and Photometric Imaging REceiver (SPIRE) of 33 nearby (median distance of 30 Mpc) Seyfert galaxies from the Revised Shapley-Ames (RSA) catalogue. We obtain the FIR nuclear (r = 1 kpc and r = 2 kpc) and integrated…
Evidence for a binary origin of a central compact object
Klochkov, Dmitry; Kavanagh, Patrick; Doroshenko, Victor +3 more
Central compact objects (CCOs) are thought to be young thermally emitting isolated neutron stars that were born during the preceding core-collapse supernova explosion. Here, we present evidence that at least in one case the CCO could have been formed within a binary system. We show that the highly reddened optical source IRAS 17287-3443, located 2…