Search Publications
Joint Planck and WMAP CMB map reconstruction
Starck, J. -L.; Sureau, F.; Bobin, J. +2 more
We present a novel estimate of the cosmological microwave background (CMB) map by combining the two latest full-sky microwave surveys: WMAP nine-year and Planck PR1. The joint processing benefits from a recently introduced component separation method coined"local-generalized morphological component analysis" (LGMCA) and based on the sparse distrib…
High-resolution abundance analysis of red giants in the globular cluster NGC 6522
Minniti, D.; Chiappini, C.; Zoccali, M. +11 more
Context. The [Sr/Ba] and [Y/Ba] scatter observed in some galactic halo stars that are very metal-poor and in a few individual stars of the oldest known Milky Way globular cluster NGC 6522 have been interpreted as evidence of early enrichment by massive fast-rotating stars (spinstars). Because NGC 6522 is a bulge globular cluster, the suggestion wa…
The molecular complex associated with the Galactic H II region Sh2-90: a possible site of triggered star formation
Zavagno, A.; Samal, M. R.; Ojha, D. K. +6 more
Aims: We investigate the star formation activity in the molecular complex associated with the Galactic H ii region Sh2-90.
Methods: We obtain the distribution of the ionized and cold neutral gas using radio-continuum and Herschel observations. We use near-infrared and Spitzer data to investigate the stellar content of the complex. We dis…
The 100-month Swift catalogue of supergiant fast X-ray transients. I. BAT on-board and transient monitor flares
Gehrels, N.; Esposito, P.; Ducci, L. +10 more
Context. Supergiant fast X-ray transients (SFXTs) are high mass X-ray binaries (HMXBs) that are defined by their hard X-ray flaring behaviour. During these flares they reach peak luminosities of 1036-1037 erg s-1 for a few hours (in the hard X-ray), which are much shorter timescales than those characterizing Be/X-r…
Optical - near-infrared catalog for the AKARI north ecliptic pole Deep field
Goto, Tomotsugu; Ohyama, Youichi; Pearson, Chris +9 more
Aims: We present an 8-band (u∗, g', r', i', z', Y, J, Ks) optical to near-infrared deep photometric catalog based on the observations made with MegaCam and WIRCam at the CFHT, and compute photometric redshifts, zp in the north ecliptic pole (NEP) region. AKARI infrared satellite carried out a deep survey in th…
Small-scale chromospheric jets above a sunspot light bridge
Ichimoto, Kiyoshi; Louis, Rohan E.; Beck, Christian
Context. The chromosphere above sunspot umbrae and penumbrae shows several different types of fast dynamic events such as running penumbral waves, umbral flashes, and penumbral microjets.
Aims: The aim of this paper is to identify the physical driver responsible for the dynamic and small-scale chromospheric jets above a sunspot light bridge. …
XMM-Newton observations reveal the disappearance of the wind in 4U 1630-47
Díaz Trigo, M.; Guainazzi, M.; Miller-Jones, J. C. A. +1 more
We report on XMM-Newton observations of the black hole X-ray binary 4U 1630-47 during its 2012-2013 outburst. The first five observations monitor the source as its luminosity increases across the high-soft state of accretion. In the sixth observation the source has made a transition to an "anomalous" state, characterised by a significant contribut…
Probing cosmic rays in nearby giant molecular clouds with the Fermi Large Area Telescope
Aharonian, Felix; Yang, Rui-zhi; de Oña Wilhelmi, Emma
We report the results of our study of the energy spectra and absolute fluxes of cosmic rays (CRs) in the Local Galaxy based on a five-year γ-ray observation with the Fermi Large Area Telescope (LAT) of eight nearby giant molecular clouds (GMCs) belonging to the Gould Belt. The γ-ray signals obtained with high statistical significance allow the det…
The Mice at play in the CALIFA survey. A case study of a gas-rich major merger between first passage and coalescence
Marino, Raffaella A.; Johnson, Benjamin D.; Gallazzi, Anna +43 more
We present optical integral field spectroscopy (IFS) observations of the Mice, a major merger between two massive (≳1011 M⊙) gas-rich spirals NGC 4676A and B, observed between first passage and final coalescence. The spectra provide stellar and gas kinematics, ionised gas properties, and stellar population diagnostics, over t…
The wind of W Hydrae as seen by Herschel. I. The CO envelope
Waters, L. B. F. M.; Menten, K. M.; Blommaert, J. A. D. L. +25 more
Context. Asymptotic giant branch (AGB) stars lose their envelopes by means of a stellar wind whose driving mechanism is not understood well. Characterizing the composition and thermal and dynamical structure of the outflow provides constraints that are essential for understanding AGB evolution, including the rate of mass loss and isotopic ratios. …