Search Publications
Particle-physics constraints from the globular cluster M5: neutrino dipole moments
Weiss, A.; Stetson, P. B.; Catelan, M. +4 more
Stellar evolution is modified if energy is lost in a "dark channel" similar to neutrino emission. Comparing modified stellar evolution sequences with observations provides some of the most restrictive limits on axions and other hypothetical low-mass particles and on non-standard neutrino properties. In particular, a putative neutrino magnetic dipo…
The properties of the extended warm ionised gas around low-redshift QSOs and the lack of extended high-velocity outflows
Jahnke, K.; Husemann, B.; Sánchez, S. F. +1 more
We present a detailed analysis of a large sample of 31 low-redshift, mostly radio-quiet type 1 quasi-stellar objects (QSOs) observed with integral field spectroscopy to study their extended emission-line regions (EELRs). We focus on the ionisation state of the gas, size and luminosity of extended narrow line regions (ENLRs), which corresponds to t…
A revised radiometric calibration for the Hinode/EIS instrument
Del Zanna, G.
An assessment of the in-flight radiometric calibration of the Hinode EUV Imaging Spectrometer (EIS) is presented. This is done with the line ratio technique applied to a wide range of observations of the quiet Sun, active regions, and flares from 2006 until 2012. The best diagnostic lines and the relevant atomic data are discussed in detail. Radia…
OGLE-2002-BLG-360: from a gravitational microlensing candidate to an overlooked red transient
Soszyński, I.; Udalski, A.; Szymański, M. K. +9 more
Context. OGLE-2002-BLG-360 was discovered as a microlensing candidate by the OGLE-III project. The subsequent light curve, however, clearly showed that the brightening of the object could not have resulted from the gravitational microlensing phenomenon.
Aims: We aim to explain the nature of OGLE-2002-BLG-360 and its eruption observed in 2002-…
The D/H ratio in the atmospheres of Uranus and Neptune from Herschel-PACS observations
Hartogh, P.; Lellouch, E.; de Graauw, T. +9 more
Herschel-PACS measurements of the rotational R(0) and R(1) HD lines in the atmospheres of Uranus and Neptune are analyzed to derive a D/H ratio with improved precision for the two planets. The derivation of the D/H ratio also includes previous measurements of the R(2) line with the Short Wavelength Spectrometer on board the Infrared Space Observat…
The redshift evolution of the distribution of star formation among dark matter halos as seen in the infrared
Daddi, Emanuele; Béthermin, Matthieu; Lagache, Guilaine +5 more
Recent studies have revealed a strong correlation between the star formation rate (SFR) and stellar mass of the majority of star-forming galaxies, the so-called star-forming main sequence. An empirical modeling approach (the 2-SFM framework) that distinguishes between the main sequence and rarer starburst galaxies is capable of reproducing most st…
MAXI J1659-152: the shortest orbital period black-hole transient in outburst
Díaz Trigo, M.; Parmar, A. N.; Belloni, T. +12 more
MAXI J1659-152 is a bright X-ray transient black-hole candidate binary system discovered in September 2010. We report here on MAXI, RXTE, Swift, and XMM-Newton observations during its 2010/2011 outburst. We find that during the first one and a half week of the outburst the X-ray light curves display drops in intensity at regular intervals, which w…
A detailed study of the radio-FIR correlation in NGC 6946 with Herschel-PACS/SPIRE from KINGFISH
Helou, G.; Roussel, H.; Murphy, E. J. +22 more
We derive the distribution of the synchrotron spectral index across NGC 6946 and investigate the correlation between the radio continuum (synchrotron) and far-infrared (FIR) emission using the KINGFISH Herschel-PACS and SPIRE data. The radio-FIR correlation is studied as a function of star formation rate, magnetic field strength, radiation field s…
Herschel/HIFI observations of [C II] and [13C II] in photon-dominated regions
Ossenkopf, V.; Lis, D. C.; Neufeld, D. A. +5 more
Context. Chemical fractionation reactions in the interstellar medium can result in molecular isotopologue abundance ratios that differ by many orders of magnitude from the isotopic abundance ratios. Understanding variations in the molecular abundance ratios through astronomical observations provides a new toolto sensitively probe the underlying ph…
Progenitors of supernova Ibc: a single Wolf-Rayet star as the possible progenitor of the SN Ib iPTF13bvn
Groh, Jose H.; Ekström, Sylvia; Georgy, Cyril
Core-collapse supernova (SN) explosions mark the end of the tumultuous life of massive stars. Determining the nature of their progenitors is a crucial step towards understanding the properties of SNe. Until recently, no progenitor has been directly detected for SN of type Ibc, which are believed to come from massive stars that lose their hydrogen …