Details

Autor(en) / Beteiligte

• Ortiz-León, Gisela N.
• Loinard, Laurent
• Dzib, Sergio A.
• Galli, Phillip A. B.
• Kounkel, Marina
• Mioduszewski, Amy J.
• Rodríguez, Luis F.
• Torres, Rosa M.
• Hartmann, Lee
• Boden, Andrew F.
• Evans, Neal J.
• Briceño, Cesar
• Tobin, John J.

Titel

The Gould's Belt Distances Survey (GOBELINS). V. Distances and Kinematics of the Perseus Molecular Cloud

Ist Teil von

• The Astrophysical journal, 2018-09, Vol.865 (1), p.73

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2018

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We derive the distance and structure of the Perseus molecular cloud by combining trigonometric parallaxes from Very Long Baseline Array (VLBA) observations, taken as part of the GOBELINS survey and Gaia Data Release 2. Based on our VLBA astrometry, we obtain a distance of 321 10 pc for IC 348. This is fully consistent with the mean distance of 320 26 measured by Gaia. The VLBA observations toward NGC 1333 are insufficient to claim a successful distance measurement to this cluster. Gaia parallaxes, on the other hand, yield a mean distance of 293 22 pc. Hence, the distance along the line of sight between the eastern and western edges of the cloud is ∼30 pc, which is significantly smaller than previously inferred. We use Gaia proper motions and published radial velocities to derive the spatial velocities of a selected sample of stars. The average velocity vectors with respect to the LSR are = (−6.1 1.6, 6.8 1.1, −0.9 1.2) and (−6.4 1.0, 2.1 1.4, −2.4 1.0) km s−1 for IC 348 and NGC 1333, respectively. Finally, our analysis of the kinematics of the stars has shown that there is no clear evidence of expansion, contraction, or rotational motions within the clusters.