Search Publications
Modeling the physical and excitation conditions of the molecular envelope of NGC 7027
Alcolea, J.; Santander-García, M.; Bujarrabal, V.
Context. The link between the shaping of bipolar planetary nebulae and the mass ejection activity of their central stars is still poorly understood. Appropriately characterizing the evolution of shells ejected during the late stages of stellar evolution and the interaction between these shells is fundamental to gain insight into the mechanism of n…
Jet-driving protostars identified from infrared observations of the Carina Nebula complex
Grellmann, R.; Preibisch, T.; McLeod, A. F. +3 more
Aims: Jets are excellent signposts for very young embedded protostars, so we want to identify jet-driving protostars as a tracer of the currently forming generation of stars in the Carina Nebula, which is one of the most massive galactic star-forming regions and which is characterised by particularly high levels of massive-star feedback on th…
Energetic feedback and 26Al from massive stars and their supernovae in the Carina region
Hartmann, D. H.; Preibisch, T.; Diehl, R. +3 more
Aims: We study the populations of massive stars in the Carina region and their energetic feedback and ejection of 26Al.
Methods: We did a census of the stellar populations in young stellar clusters within a few degrees of the Carina nebula. For each star we estimated the mass, based on the spectral type and the host cluster ag…
Herschel/HIFI observations of CO, H2O and NH3 in Monoceros R2
Le Bourlot, J.; Le Petit, F.; Ossenkopf, V. +12 more
Context. Mon R2, at a distance of 830 pc, is the only ultracompact H ii region (UCH ii) where the associated photon-dominated region (PDR) can be resolved with Herschel. Owing to its brightness and proximity, it is one of the best-suited sources for investigating the chemistry and physics of highly UV-irradiated PDRs.
Aims: Our goal is to est…
Exploring X-ray and radio emission of type 1 AGN up to z ~ 2.3
Ballo, L.; Barcons, X.; Carrera, F. J. +1 more
Context. X-ray emission from active galactic nuclei (AGN) is dominated by the accretion disk around a supermassive black hole. The radio luminosity, however, has not such a clear origin except in the most powerful sources where jets are evident. The origin (and even the very existence) of the local bi-modal distribution in radio-loudness is also a…
Herschel-PACS far-infrared detections of Lyman-α emitters at 2.0 ≲ z ≲ 3.5
Berta, S.; Magnelli, B.; Lutz, D. +23 more
In this work we analyse the physical properties of a sample of 56 spectroscopically selected star-forming (SF) Lyα emitting galaxies at 2.0 ≲ z ≲ 3.5 using both a spectral energy distribution (SED) fitting procedure from rest-frame UV to mid-IR and direct 160 µm FIR observations taken with the Photodetector Array Camera and Spectrometer (PAC…
XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J0440.9+4431
Tiengo, A.; Mereghetti, S.; Sidoli, L. +2 more
Many X-ray accreting pulsars have a soft excess below 10 keV. This feature was also detected in faint sources and at low luminosity levels, suggesting that it is an ubiquitous phenomenon. For the high luminosity pulsars (LX > 1036 erg s-1), the fit to this component with thermal emission models usually provides …
XMM-Newton view of the N 206 superbubble in the Large Magellanic Cloud
Kavanagh, P. J.; Sasaki, M.; Points, S. D.
Aims: We perform an analysis of the X-ray superbubble in the N 206 H ii region in the Large Magellanic Cloud using current generation facilities to gain a better understanding of the physical processes at work in the superbubble and to improve our knowledge of superbubble evolution.
Methods: We used XMM-Newton observations of the N 206 r…
Multi-frequency observations of SNR J0453-6829 in the LMC. A composite supernova remnant with a pulsar wind nebula
Pietsch, W.; Haberl, F.; Filipović, M. D. +7 more
Context. The Large Magellanic Cloud (LMC) is rich in supernova remnants (SNRs), which can be investigated in detail with radio, optical, and X-ray observations. SNR J0453-6829 is an X-ray and radio-bright remnant in the LMC, within which previous studies revealed the presence of a pulsar wind nebula (PWN), making it one of the most interesting SNR…
Accurate classification of 29 objects detected in the 39 month Palermo Swift/BAT hard X-ray catalogue
Palazzi, E.; Minniti, D.; Masetti, N. +15 more
Through an optical campaign performed at four telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift /Burst Alert Telescope (BAT) and listed in the 39 mont…