Search Publications
The solar wind disappearance event of 11 May 1999: source region evolution
Mason, H. E.; Janardhan, P.; Tripathi, D.
Context: A recent, detailed study of the well-known “solar wind disappearance event” of 11 May 1999 traced its origin to a coronal hole (CH) lying adjacent to a large active region (AR), AR8525 in Carrington rotation 1949. The AR was located at central meridian on 05 May 1999 when the flows responsible for this event began. We examine the evolutio…
Redshifted emission lines and radiative recombination continuum from the Wolf-Rayet binary θ Muscae: evidence for a triplet system?
Maeda, Y.; Tsuboi, Y.; Sugawara, Y.
We present XMM-Newton observations of the WC binary θ Muscae (WR 48), the second brightest Wolf-Rayet binary in optical wavelengths. The system consists of a short-period (19.1375 days) WC5/WC6 + O6/O7V binary and possibly has an additional O supergiant companion (O9.5/B0Iab) which is optically identified at a separation of ~46 mas. Strong emissio…
Faint super-soft X-ray sources in XMM-Newton Large Magellanic Cloud fields
Haberl, F.; Kahabka, P.; Pakull, M. +4 more
Aims: We report the discovery of three faint, super-soft X-ray sources in LMC fields observed with XMM-Newton.
Methods: We analyse the three new sources together with RX J0537.7-7034 and RX J0507.1-6743, both known since ROSAT.
Results: We identify XMMU J050803.1-684017 with the LMC planetary nebula LHA 120-N 102 = LMC SMP 29. The EPIC-pn …
Coronal loop slow mode oscillations driven by the kink instability
Verwichte, E.; Haynes, M.; Arber, T. D.
Aims:To establish the dominant wave modes generated by an internal, m=1 kink instability in a short coronal flux tube.
Methods: The 3D MHD numerical simulations are performed using Lare3d to model the kink instability and the subsequent wave generation. The initial conditions are a straight, zero net current flux tube containing a twist higher…
Interacting jets from binary protostars
Bacciotti, F.; Murphy, G. C.; Lery, T. +3 more
Aims: We investigate potential models that could explain why multiple proto-stellar systems predominantly show single jets. During their formation, stars most frequently produce energetic outflows and jets. However, binary jets have only been observed in a very small number of systems.
Methods: We model numerically 3D binary jets for various o…
Star formation in the Trifid Nebula. Cores and filaments
Cernicharo, J.; Lefloch, B.; Pardo, J. R.
Aims: We aim to characterize the properties of the prestellar and protostellar condensations to understand the star formation processes at work in a young HII region
Methods: We have obtained maps of the 1.25 mm thermal dust emission and the molecular gas emission over a region of 20' × 10' around the Trifid Nebula (M 20), with the IRAM 30 m a…
A detailed study of the L1641N star formation region
Olofsson, G.; Gâlfalk, M.
Aims: We search for young stellar objects (YSOs) in the L1641N cluster and characterize the star formation activity through determination of the age distribution, mass function, spatial distribution, and the star formation history.
Methods: Multi-wavelength broad band photometry both from space and the ground are used to look for IR excess in …
A peculiar planetary nebula candidate in a globular cluster in the Fornax dwarf spheroidal galaxy
Larsen, S. S.
Context: Until now, only one planetary nebula (PN) has been known in the Fornax dwarf spheroidal galaxy.
Aims: The discovery of a second PN candidate, associated with one of the 5 globular clusters in the Fornax dwarf, is reported.
Methods: Spectra of the globular cluster H5, obtained with the UVES echelle spectrograph on the ESO Very Larg…
High-resolution X-ray spectroscopy of θ Carinae
Nazé, Y.; Rauw, G.
Context: The peculiar hot star θ Car in the open cluster IC 2602 is a blue straggler as well as a single-line binary with a short period (2.2d).
Aims: Its high-energy properties are not well known, though X-rays can provide useful constraints on the energetic processes at work in binaries as well as in peculiar, single objects.
Methods: We…
The X-ray variability and the near-IR to X-ray spectral energy distribution of four low luminosity Seyfert 1 galaxies
Papadakis, I. E.; Brinkmann, W.; Xilouris, E. M. +1 more
Context: We present the results from a study of the X-ray variability and the near-IR to X-ray spectral energy distribution of four low-luminosity, Seyfert 1 galaxies.
Aims: We compared their variability amplitude and broad band spectrum with those of more luminous AGN in order to investigate whether accretion in low-luminosity AGN operates as…