VLA Cm-Wave Survey of Young Stellar Objects in the Oph a Cluster
A&A 631, A58 (2019) Astronomy https://doi.org/10.1051/0004-6361/201935340 & © A. Coutens et al. 2019 Astrophysics VLA cm-wave survey of young stellar objects in the Oph A cluster: constraining extreme UV- and X-ray-driven disk photoevaporation A pathfinder for Square Kilometre Array studies? A. Coutens1, H. B. Liu2, I. Jiménez-Serra3, T. L. Bourke4, J. Forbrich5, M. Hoare6, L. Loinard7,8, L. Testi2,9, M. Audard10,11, P. Caselli12, A. Chacón-Tanarro13, C. Codella9,14, J. Di Francesco15,16, F. Fontani9, M. Hogerheijde17,18, A. Johansen19, D. Johnstone15,16, S. Maddison20, O. Panic´6, L. M. Pérez21, L. Podio9, A. Punanova22, J. M. C. Rawlings23, D. Semenov24,25, M. Tazzari26, J. J. Tobin27, M. H. D. van der Wiel28, H. J. van Langevelde29,16, W. Vlemmings30, C. Walsh6, and D. Wilner31 (Affiliations can be found after the references) Received 22 February 2019 / Accepted 4 September 2019 ABSTRACT Observations of young stellar objects (YSOs) in centimeter bands can probe the continuum emission from growing dust grains, ionized winds, and magnetospheric activity that are intimately connected to the evolution of protoplanetary disks and the formation of planets. We carried out sensitive continuum observations toward the Ophiuchus A star-forming region, using the Karl G. Jansky Very Large 1 Array (VLA) at 10 GHz over a field-of-view of 60 and with a spatial resolution of θmaj θmin 000: 4 000: 2. We achieved a 5 µJy beam− rms noise level at the center of our mosaic field of view. Among the 18 sources we detected,× 16∼ were× YSOs (three Class 0, five Class I, six Class II, and two Class III) and two were extragalactic candidates.
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