Search Publications
Kinematics and properties of the central molecular zone as probed with [C II]
Morris, M. R.; Goldsmith, P. F.; Langer, W. D. +2 more
Context. The Galactic central molecular zone (CMZ) is a region containing massive and dense molecular clouds, with dynamics driven by a variety of energy sources including a massive black hole. It is thus the nearest template for understanding physical processes in extragalactic nuclei. The CMZ's neutral interstellar gas has been mapped spectrally…
The kinematic signature of the Galactic warp in Gaia DR1. I. The Hipparcos subsample
Lattanzi, M. G.; Drimmel, R.; Poggio, E. +2 more
Context. The mechanism responsible for the warp of our Galaxy, as well as its dynamical nature, continues to remain unknown. With the advent of high precision astrometry, new horizons have been opened for detecting the kinematics associated with the warp and for constraining possible warp formation scenarios for the Milky Way.
Aims: The aim o…
Feedback of atomic jets from embedded protostars in NGC 1333
Güdel, Manuel; Dionatos, Odysseas
Context. The feedback of star formation to the parent cloud is conventionally examined through the study of molecular outflows. Little is known, however, about the effect that atomic ejecta tracing fast shocks can have on small scales or on global cloud properties.
Aims: Our immediate objective is to study the morphology of protostellar eject…
X-ray variability of Seyfert 1.8/1.9 galaxies
Guainazzi, M.; Panessa, F.; González-Martín, O. +3 more
Context. Seyfert 1.8/1.9 are sources showing weak broad Hα components in their optical spectra. According to unification schemes, they are seen with an edge-on inclination, similar to type 2 Seyfert galaxies, but with slightly lower inclination angles.
Aims: We aim to test whether Seyfert 1.8/1.9 have similar properties at UV and X…
Impact of basic angle variations on the parallax zero point for a scanning astrometric satellite
van Leeuwen, Floor; Lindegren, Lennart; Hobbs, David +2 more
Context. Determination of absolute parallaxes by means of a scanning astrometric satellite such as Hipparcos or Gaia relies on the short-term stability of the so-called basic angle between the two viewing directions. Uncalibrated variations of the basic angle may produce systematic errors in the computed parallaxes.
Aims: We examine the coupl…
SED-dependent galactic extinction prescription for Euclid and future cosmological surveys
Paltani, Stéphane; Galametz, Audrey; Saglia, Roberto +2 more
The outcome of upcoming cosmological surveys will depend on the accurate estimates of photometric redshifts. In the framework of the implementation of the photometric redshift algorithm for the ESA Euclid mission, we are exploring new avenues to improve current template-fitting methods. This paper focusses in particular on the prescription of the …
Searching for intermediate-mass black holes in galaxies with low-luminosity AGN: a multiple-method approach
Ciambur, Bogdan C.; Graham, Alister W.; Mutlu-Pakdil, Burçin +7 more
Aims: This work is the first stage of a campaign to search for intermediate-mass black holes (IMBHs) in low-luminosity active galactic nuclei (LLAGN) and dwarf galaxies. An additional and equally important aim of this pilot study is to investigate the consistency between the predictions of several popular black hole scaling relations and the …
BL Lacertae: X-ray spectral evolution and a black-hole mass estimate
Titarchuk, Lev; Seifina, Elena
We present an analysis of the spectral properties observed in X-rays from active galactic nucleus BL Lacertae using RXTE, Suzaku, ASCA, BeppoSAX, and Swift observations. The total time covered by these observations is approximately 20 yr. We show strong observational evidence that this source undergoes X-ray spectral transitions from the low hard …
Distances of cataclysmic variables and related objects derived from Gaia Data Release 1
Ramsay, Gavin; Wheatley, Peter J.; Gänsicke, Boris T. +1 more
We consider the parallaxes of sixteen cataclysmic variables and related objects that are included in the TGAS catalogue, which is part of the Gaia first data release, and compared these with previous parallax measurements. The parallax of the dwarf nova SS Cyg is consistent with the parallax determination made using the VLBI, but with only one of …
Galactic cold cores. VIII. Filament formation and evolution: Filament properties in context with evolutionary models
Bernard, J. -P.; Juvela, M.; Marshall, D. J. +15 more
Context. The onset of star formation is intimately linked with the presence of massive unstable filamentary structures. These filaments are therefore key for theoretical models that aim to reproduce the observed characteristics of the star formation process in the Galaxy.
Aims: As part of the filament study carried out by the Herschel Galacti…