Search Publications
A revision of the X-ray absorption nature of BALQSOs
Streblyanska, A.; Barcons, X.; Carrera, F. J. +1 more
Aims: Broad absorption-line quasars (BALQSOs) are key objects for studying the structure and emission/absorption properties of AGN. However, despite their fundamental importance, the properties of BALQSOs remain poorly understood. To investigate the X-ray nature of these sources, as well as the correlations between X-ray and rest-frame UV pro…
The 35Cl/37Cl isotopic ratio in dense molecular clouds: HIFI observations of hydrogen chloride towards W3 A
de Graauw, T.; Caux, E.; Cernicharo, J. +9 more
We report on the detection with the HIFI instrument on board the Herschel satellite of the two hydrogen chloride isotopologues, H35Cl and H37Cl, towards the massive star-forming region W3 A. The J = 1-0 line of both species was observed with receiver 1b of the HIFI instrument at ~625.9 and ~624.9 GHz. The different hyperfine …
Study of Hubble Space Telescope counterparts to Chandra X-ray sources in the globular cluster M 71
Heinke, C. O.; Edmonds, P. D.; Hsieh, B. C. +3 more
Aims: We report on archival Hubble Space Telescope (HST) observations of the globular cluster M 71 (NGC 6838).
Methods: These observations, covering the core of the globular cluster, were performed by the Advanced Camera for Surveys (ACS) and the Wide Field Planetary Camera 2 (WFPC2). Inside the half-mass radius (rh = 1farcm65…
Mapping the ionised gas around the luminous QSO HE 1029-1401: evidence for minor merger events?
Jahnke, K.; Husemann, B.; Sánchez, S. F. +4 more
We present VIMOS integral field spectroscopy of the brightest radio-quiet QSO on the southern sky HE 1029-1401 at a redshift of z = 0.086. Standard decomposition techniques for broad-band imaging are extended to integral field data in order to deblend the QSO and host emission. We perform a tentative analysis of the stellar continuum, finding a yo…
Excitation of the molecular gas in the nuclear region of M 82
Martín-Pintado, J.; Morris, P.; Harris, A. I. +23 more
We present high-resolution HIFI spectroscopy of the nucleus of the archetypical starburst galaxy M 82. Six 12CO lines, 2 13CO lines and 4 fine-structure lines have been detected. Besides showing the effects of the overall velocity structure of the nuclear region, the line profiles also indicate the presence of multiple compon…
J0454-0309: evidence of a strong lensing fossil group falling into a poor galaxy cluster
Schrabback, T.; Schirmer, M.; Hildebrandt, H. +3 more
Aims: We have discovered a strong lensing fossil group (J0454) projected near the well-studied cluster MS0451-0305. Using the large amount of available archival data, we compare J0454 to normal groups and clusters. A highly asymmetric image configuration of the strong lens enables us to study the substructure of the system.
Methods: We u…
Multi-wavelength observations of a giant flare on CN Leonis. II. Chromospheric modelling with PHOENIX
Schmitt, J. H. M. M.; Hauschildt, P. H.; Fuhrmeister, B.
Aims: In M dwarfs, optical emission lines and continua are sensitive to changing chromospheric conditions, e.g., during flares. To study flare conditions for an observed spectrum, a comparison to synthesised spectra from model atmospheres is needed.
Methods: Using the stellar atmosphere code PHOENIX, we computed a set of 41 1D NLTE param…
Physical properties of the Sh2-104 H II region as seen by Herschel
Miville-Deschênes, M. -A.; Boulanger, F.; Abergel, A. +46 more
Context. Sh2-104 is a Galactic H ii region with a bubble morphology, detected at optical and radio wavelengths. It is considered the first observational confirmation of the collect-and-collapse model of triggered star-formation.
Aims: We aim to analyze the dust and gas properties of the Sh2-104 region to better constrain its effect on local f…
Oscillation mode lifetimes of red giants observed during the initial and first anticentre long run of CoRoT
Baudin, F.; Chaplin, W. J.; De Ridder, J. +5 more
Context. Long timeseries of data increase the frequency resolution in the power spectrum. This allows for resolving stochastically excited modes with long mode lifetimes, as well as features that are close together in frequency. The CoRoT fields observed during the initial run and second long run partly overlap, and stars in this overlapping field…
HRC-I/Chandra X-ray observations towards σ Orionis
Caballero, J. A.; Albacete-Colombo, J. F.; López-Santiago, J.
Aims: We investigated the X-ray emission from young stars and brown dwarfs in the σ Orionis cluster (τ ~ 3 Ma, d ~ 385 pc) and its relation to mass, the presence of circumstellar discs, and separation to the cluster centre by taking advantage of the superb spatial resolution of the Chandra X-ray Observatory.
Methods: We used public HRC-I…