Search Publications
The 400d Galaxy Cluster Survey weak lensing programme. I. MMT/Megacam analysis of CL0030+2618 at z = 0.50
Zhang, Y. -Y.; Vikhlinin, A.; Sarazin, C. L. +7 more
Context. Studying cosmological structure formation provides insights into all of the universe's components: baryonic matter, dark matter, and, notably, dark energy. Measuring the mass function of galaxy clusters at high redshifts is particularly useful probe for both learning about the history of structure formation and constraining cosmological p…
Cold dust in three massive evolved stars in the LMC
van Loon, J. Th.; Okumura, K.; Hony, S. +19 more
Massive evolved stars can produce large amounts of dust, and far-infrared (IR) data are essential for determining the contribution of cold dust to the total dust mass. Using Herschel, we search for cold dust in three very dusty massive evolved stars in the Large Magellanic Cloud: R71 is a luminous blue variable, HD 36402 is a Wolf-Rayet triple sys…
870 µm observations of evolved stars with LABOCA
Blommaert, J. A. D. L.; Justtanont, K.; Barlow, M. J. +3 more
Context. During their evolution, asymptotic giant branch (AGB) stars experience a high mass loss which leads to the formation of a circumstellar envelope (CSE) of dust and gas. The mass loss process is the most important phenomenon during this evolutionary stage. In order to understand it, it is important to study the physical parameters of the CS…
Reversal of infall in SgrB2(M) revealed by Herschel/HIFI observations of HCN lines at THz frequencies
Menten, K. M.; Martin, P. G.; Murphy, J. A. +54 more
Aims: To investigate the accretion and feedback processes in massive star formation, we analyze the shapes of emission lines from hot molecular cores, whose asymmetries trace infall and expansion motions.
Methods: The high-mass star forming region SgrB2(M) was observed with Herschel/HIFI (HEXOS key project) in various lines of HCN and it…
The radius and effective temperature of the binary Ap star β CrB from CHARA/FLUOR and VLT/NACO observations
Kervella, P.; Kiss, L. L.; Tuthill, P. G. +14 more
Context. The prospects for using the asteroseismology of rapidly oscillating Ap (roAp) stars are hampered by the large uncertainty in fundamental stellar parameters. Results in the literature for the effective temperature (Teff) often span a range of 1000 K.
Aims: Our goal is to reduce systematic errors and improve the Teff
Far-infrared line imaging of the starburst ring in NGC 1097 with the Herschel/PACS spectrometer
Helou, G.; Roussel, H.; Murphy, E. J. +38 more
NGC 1097 is a nearby SBb galaxy with a Seyfert nucleus and a bright starburst ring. We study the physical properties of the interstellar medium (ISM) in the ring using spatially resolved far-infrared spectral maps of the circumnuclear starburst ring of NGC 1097, obtained with the PACS spectrometer on board the Herschel Space Observatory. In partic…
A detailed study of the main sequence of the globular cluster NGC 6397: can we derive constraints on the existence of multiple populations?
D'Antona, F.; Ventura, P.; di Criscienzo, M.
Context. Globular clusters can no longer be regarded as examples of “simple stellar populations” as all those so far examined contain an important fraction of “second generation” stars, in which the light elements are processed through the hot CNO cycle, and helium variations may be present. Clusters apparently “simple” contain a majority of secon…
Herschel-ATLAS: Blazars in the science demonstration phase field
Andreani, P.; Rodighiero, G.; Valtchanov, I. +54 more
To investigate the poorly constrained sub-mm counts and spectral properties of blazars we searched for these in the Herschel-ATLAS (H-ATLAS) science demonstration phase (SDP) survey catalog. We cross-matched 500 µm sources brighter than 50 mJy with the FIRST radio catalogue. We found two blazars, both previously known. Our study is among the…
Quiescent and flaring X-ray emission from the nearby M/T dwarf binary SCR 1845-6357
Schmitt, J. H. M. M.; Robrade, J.; Poppenhaeger, K.
Aims: X-ray emission is an important diagnostics to study magnetic activity in very low mass stars that are presumably fully convective and have an effectively neutral photosphere.
Methods: We investigate an XMM-Newton observation of SCR 1845-6357, a nearby, ultracool M 8.5 / T 5.5 dwarf binary. The binary is unresolved in the XMM detect…
Origin of the dust emission from Tycho's SNR
Onaka, T.; Furuzawa, A.; Lee, J. -J. +6 more
Aims: We investigate the spatial distribution of dust emission around Tycho's SNR to understand its origin. We distinguish the dust associated with the SNR from that of the surrounding ISM.
Methods: We performed mid- to far-infrared imaging observations of the remnant at wavelengths of 9, 15, 18, 24, 65, 90, 140, and 160 µm using t…