Search Publications
Fine structures at pore boundary
Bharti, L.; Quintero Noda, C.; Joshi, C. +2 more
We present high resolution observations of fine structures at pore boundaries. The inner part of granules towards umbra show dark striations which evolve into a filamentary structure with dark core and `Y' shape at the head of the filaments. These filaments migrate into the umbra similar to penumbral filaments. These filaments show higher temperat…
Observations of the planetary nebula RWT 152 with OSIRIS/GTC
Solano, E.; Ulla, A.; Miranda, L. F. +2 more
RWT 152 is one of the few known planetary nebulae with an sdO central star. We present subarcsecond red tunable filter Hα imaging and intermediate-resolution, long-slit spectroscopy of RWT 152 obtained with OSIRIS/GTC (Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy/Gran Telescopio Canarias) with the goal of anal…
Fundamental stellar parameters for selected T-Tauri stars in the Chamaeleon and Rho Ophiuchus star-forming regions
James, D. J.; Bouvier, J.; Santos, N. C. +4 more
We present the results of an optical photometry and high-resolution spectroscopy campaign for a modest sample of X-ray selected stars in the Chamaeleon and Rho Ophiuchus star-forming regions. With R∼ 50 000 optical spectra, we establish kinematic membership of the parent association and confirm stellar youth for each star in our sample. With the a…
Searching for X-ray sources in nearby late-type galaxies with low-star formation rates
Kaaret, P.; Poutanen, J.; Kajava, J. J. E. +4 more
Late-type non-starburst galaxies have been shown to contain X-ray emitting objects, some being ultraluminous X-ray sources. We report on XMM-Newton observations of 11 nearby, late-type galaxies previously observed with the Hubble Space Telescope (HST) in order to find such objects. We found 18 X-ray sources in or near the optical extent of the gal…
Erratum: Discovery of H I gas in a young radio galaxy at z = 0.44 using the Australian Square Kilometre Array Pathfinder
Forsyth, R.; Sault, R. J.; Heywood, I. +100 more
Discovery of two new fast X-ray transients with INTEGRAL: IGR J03346+4414 and IGR J20344+3913
Sidoli, L.; Bird, A. J.; Paizis, A. +1 more
We report on the discovery of two fast X-ray transients (FXTs) from analysis of archival INTEGRAL data. Both are characterized by a remarkable hard X-ray activity above 20 keV, in terms of duration (∼15 and 30 min, respectively), peak flux (∼10-9 erg cm-2 s-1) and dynamic range (∼2400 and 1360, respectively). Swift…
Searching for Faraday rotation in cosmic microwave background polarization
Battaner, E.; Ruiz-Granados, B.; Florido, E.
We use the Wilkinson Microwave Anisotropy Probe (WMAP) 9th-year foreground reduced data at 33, 41 and 61 GHz to derive a Faraday rotation at map and at angular power spectrum levels taking into account their observational errors. A processing mask provided by WMAP is used to avoid contamination from the disc of our Galaxy and local spurs. We have …
2D photochemical model for forbidden oxygen line emission for comet 1P/Halley
Gunell, H.; Rubin, M.; De Keyser, J. +8 more
We present here a 2D model of photochemistry for computing the production and loss mechanisms of the O(1S) and O(1D) states, which are responsible for the emission lines at 577.7, 630, and 636.4 nm, in case of the comet 1P/Halley. The presence of O2 within cometary atmospheres, measured by the in situ Rosetta and G…
A new investigation of the possible X-ray counterparts of the magnetar candidate AX J1845-0258
Pintore, Fabio; Mereghetti, Sandro
AX J1845-0258 is a transient X-ray pulsar, with spin period of 6.97 s, discovered with the ASCA satellite in 1993. Its soft spectrum and the possible association with a supernova remnant suggest that AX J1845-0258 might be a magnetar, but this has not been confirmed yet. A possible counterpart one order of magnitude fainter, AX J184453-025640, has…
ERRATUM: `The variable spin-down rate of the transient magnetar XTE J1810-197'
Pintore, Fabio; Mereghetti, Sandro; Esposito, Paolo +7 more