Search Publications
The Lyman Alpha Reference Sample. IX. Revelations from deep surface photometry
Cannon, John M.; Hayes, Matthew; Östlin, Göran +7 more
Context. The Lyman α Reference Sample (LARS) of 14 star-forming galaxies offers a wealth of insight into the workings of these local analogs to high-redshift star-forming galaxies. The sample has been well-studied in terms of Lyα and other emission line properties, such as H I mass, gas kinematics, and morphology.
Aims: We analyze deep surfac…
Herschel-PACS photometry of faint stars for sensitivity performance assessment and establishment of faint FIR primary photometric standards
Balog, Z.; Müller, T. G.; Klaas, U. +3 more
Aims: Our aims are to determine flux densities and their photometric accuracy for a set of seventeen stars that range in flux from intermediately bright (≲2.5 Jy) to faint (≳5 mJy) in the far-infrared (FIR). We also aim to derive signal-to-noise dependence with flux and time, and compare the results with predictions from the Herschel exposure…
Exploring the substellar population in the Hyades open cluster
Rebolo, R.; Lodieu, N.; Pérez-Garrido, A. +1 more
Aims: Our aim is to identify substellar members of the nearby Hyades open star cluster to determine the photometric and spectroscopic properties of brown dwarfs at moderately old ages and extend our knowledge of the substellar mass function of the cluster.
Methods: We cross-matched the 2MASS and WISE public catalogues and measured proper…
Far-infrared photometry of OJ 287 with the Herschel Space Observatory
Lähteenmäki, Anne; Tornikoski, Merja; Tammi, Joni +6 more
Context. The blazar OJ 287 has shown a ≈12 year quasi-periodicity over more than a century, in addition to the common properties of violent variability in all frequency ranges. It is the strongest known candidate to have a binary singularity in its central engine. Aim. We aim to better understand the different emission components by searching for …
High-velocity hot CO emission close to Sgr A*. Herschel/HIFI submillimeter spectral survey toward Sgr A*
Teyssier, D.; Cernicharo, J.; Gerin, M. +3 more
The properties of molecular gas, the fuel that forms stars, inside the cavity of the circumnuclear disk (CND) are not well constrained. We present results of a velocity-resolved submillimeter scan ( 480-1250 GHz) and [C II] 158 µm line observations carried out with Herschel/HIFI toward Sgr A*; these results are complemented by a 2…
Kinematics of outer halo globular clusters: M 75 and NGC 6426
Hanke, Michael; Kacharov, Nikolay; Koch, Andreas
Globular clusters (GCs) and their dynamic interactions with the Galactic components provide an important insight into the structure and formation of the early Milky Way. We present a kinematic study of two outer halo GCs based on a combination of VLT/FORS2, VLT/FLAMES, and Magellan/MIKE low- and high-resolution spectroscopy of 32 and 27 member sta…
Digitization and astrometric calibration of Carte du Ciel photographic plates with Gaia DR1
Prusti, T.; Ness, J. -U.; Muinonen, K. +7 more
Context. Carte du Ciel was a global international project at the end of the nineteenth and beginning of the twentieth century to map the sky to about magnitude 14 on photographic plates. The full project was never observationally completed and a large fraction of the observations made remain unanalyzed.
Aims: We want to study whether the astr…
Very narrow coronal mass ejections producing solar energetic particles
Gopalswamy, N.; Wheatland, M. S.; Bronarska, K. +1 more
Aims: Our main aim is to study the relationship between low-energy solar particles (energies below 1 MeV) and very narrow coronal mass ejections ("jets" with angular width ≤ 20°).
Methods: For this purpose, we considered 125 very narrow coronal mass ejections (CMEs) from 1999 to 2003 that are potentially associated with low-energy solar …
Dynamical masses of M-dwarf binaries in young moving groups. II. Toward empirical mass-luminosity isochrones
Henning, Thomas; Brandner, Wolfgang; Girard, Julien +6 more
Low-mass stars exhibit substantial pre-main sequence evolution during the first ∼100 Myr of their lives. Thus, young M-type stars are prime targets for isochronal dating, especially in young moving groups (YMGs), which contain large amounts of stars in this mass and age range. If the mass and luminosity of a star can both be directly determined, t…
Embedded AGN and star formation in the central 80 pc of IC 3639
Tristram, K. R. W.; Gandhi, P.; Weigelt, G. +2 more
Aims: Our goal is to probe the inner structure and the nature of the mid-IR emission in the active galaxy IC 3639, which hosts a Seyfert 2 nucleus and shows signatures of strong star-forming activity.
Methods: We used interferometric observations in the N-band with VLTI/MIDI to resolve the mid-IR emission of this nucleus. The origin of t…