Search Publications
Revisiting astrometric parameters of quasars in Gaia-CRF2
Liu, N.; Zhu, Z.; Liu, J. -C. +1 more
Aims: In order to check the astrometric solution quality, dependences of parallaxes and proper motions on precision, reliability, and consistency of sample solutions are studied for the quasars in the celestial reference frame of the second release of Gaia data (Gaia-CRF2).
Methods: Astrometric statistics (the number of visibility period…
Constraining the abundance of dark matter in the central region of the galaxy cluster MACS J1206.2-0847 with a free-form strong lensing analysis
Lam, Daniel; Diego, Jose M.; Herranz, Diego +1 more
We performed a free-form strong lensing analysis of the galaxy cluster MACS J1206.2-0847 in order to estimate and constrain its inner dark matter distribution. The free-form method estimates the cluster total mass distribution without using any prior information about the underlying mass. We used 97 multiple lensed images belonging to 27 backgroun…
Assessing membership projection errors in star forming regions
Cambrésy, L.; Boily, C. M.; Roland, T.
Context. Young stellar clusters harbour complex spatial structures emerging from the star formation process. Identifying stellar over-densities is a key step in better constraining how these structures are formed. The high accuracy of distances derived from Gaia DR2 parallaxes still do not allow us to locate individual stars within clusters of ≈1 …
Using Herschel and Planck observations to delineate the role of magnetic fields in molecular cloud structure (Corrigendum)
Soler, Juan D.
High reddening patches in Gaia DR2. Possible artifacts or indication of star formation at the edge of the Galactic disk
Beitia-Antero, Leire; Gómez de Castro, Ana Inés; de la Fuente Marcos, Raúl
Context. Deep GALEX UV data show that the extreme outskirts of some spiral galaxies are teeming with star formation. Such young stellar populations evolving so far away from the bulk of their host galaxies challenge our overall understanding of how star formation proceeds at galactic scales. It is at present unclear whether our own Milky Way may a…