Search Publications
CEN 34 - high-mass YSO in M 17 or background post-AGB star?
Fang, Min; Chen, Zhiwei; Jiang, Zhibo +3 more
We investigate the proposed high-mass young stellar object (YSO) candidate CEN 34, thought to be associated with the star-forming region M 17. Its optical to near-infrared (550-2500 nm) spectrum reveals several photospheric absorption features, such as Hα, the Ca ii triplet, and the CO bandhead, but lacks emission lines. The spectral features in t…
Mapping of interstellar clouds with infrared light scattered from dust: TMC-1N
Juvela, M.; Malinen, J.; Pelkonen, V. -M. +1 more
Context. Mapping of the near-infrared (NIR) scattered light is a recent method for the study of interstellar clouds, complementing other, more commonly used methods, like dust emission and extinction.
Aims: Our goal is to study the usability of this method on larger scale, and compare the properties of a filamentary structure using infrared s…
The XMM-Newton Wide Angle Survey (XWAS)
Esquej, P.; Ebrero, J.; Carrera, F. J. +16 more
Aims: This programme is aimed at obtaining one of the largest X-ray selected samples of identified active galactic nuclei to date in order to characterise such a population at intermediate fluxes, where most of the Universe's accretion power originates. We present the XMM-Newton Wide Angle Survey (XWAS), a new catalogue of almost a thousand X…
Star formation, structure, and formation mechanism of cometary globules: near-infrared observations of CG 1 and CG 2
Haikala, L. K.; Mäkelä, M. M.
Context. Cometary globule (CG) 1 and CG 2 are "classic" cometary globules in the Gum Nebula. They have compact heads and long dusty tails that point away from the centre of the Gum Nebula.
Aims: We study the structure of CG 1 and CG 2 and the star formation in them to find clues to the CG formation mechanism. The two possible CG formation mec…
Active galactic nuclei behind the SMC selected from radio and X-ray surveys
Pietsch, W.; Haberl, F.; Filipović, M. D. +8 more
Context. The XMM-Newton survey of the Small Magellanic Cloud (SMC) revealed 3053 X-ray sources with the majority expected to be active galactic nuclei (AGN) behind the SMC. However, the high stellar density in this field often does not allow assigning unique optical counterparts and hinders source classification. On the other hand, the association…
The distribution of warm gas in the G327.3-0.6 massive star-forming region
van Dishoeck, E. F.; Güsten, R.; van der Tak, F. +3 more
Aims: Most studies of high-mass star formation focus on massive and/or luminous clumps, but the physical properties of their larger scale environment are poorly known. In this work, we aim at characterising the effects of clustered star formation and feedback of massive stars on the surrounding medium by studying the distribution of warm gas …
Silicon isotopic abundance toward evolved stars and its application for presolar grains
de Gregorio-Monsalvo, I.; Testi, L.; Gray, M. D. +8 more
Aims: Galactic chemical evolution (GCE) is important for understanding the composition of the present-day interstellar medium (ISM) and of our solar system. In this paper, we aim to track the GCE by using the 29Si/30Si ratios in evolved stars and tentatively relate this to presolar grain composition.
Methods: We use…
Interstellar H2 toward HD 147888
Gnaciński, P.
The ultraviolet and far-ultraviolet spectra of
Hα Moreton waves observed on December 06, 2006. A 2D case study
Luoni, M. L.; Costa, A.; Francile, C. +1 more
Context. We present high temporal resolution observations of a Moreton wave event detected with the Hα Solar Telescope for Argentina (HASTA) in the Hα line 656.3 nm, on December 6, 2006.
Aims: The aim is to contribute to the discussion about the nature and triggering mechanisms of Moreton wave events.
Methods: We describe the HASTA teles…
Properties of sunspot penumbral grains observed with Hinode
Ichimoto, K.; Zhang, Y.
Context. Penumbral grains (PGs) are small-scale (subarcsec) bright features found in the bright penumbral filament in the outer parts of sunspots.
Aims: We aim to study properties of PGs at the blue continuum (4504 Å) and the G-band (4305 Å) by using simultaneous seeing free data obtained by Broadband Filter Imager (BFI) on board Hinode.
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