Dr. J. Forbrich
University of Hertfordshire, UK
The Orion Radio All-Stars: new insights into YSO radio emission, using the VLA, VLBA, and ALMA
Abstract : With significant new observing capabilities, centimeter-wavelength radio astronomy is currently in a renaissance leading up to the advent of the Square Kilometre Array (SKA). The sensitivity upgrades of both the NRAO Very Large Array (VLA) and the Very Long Baseline Array (VLBA) have begun to provide us with a much improved perspective on stellar centimeter radio emission, particularly concerning young stellar objects (YSOs) and ultracool dwarfs. For the first time we now have systematic access to the radio time domain. I will mainly present a deep VLA and VLBA radio survey of the Orion Nebula Cluster (ONC), where we have found hundreds of compact radio sources, a sevenfold increase over previous studies, and intricate detail on the radio emission of proplyds. With simultaneous radio-X-ray time domain information (Chandra), this project is providing first constraints on YSO radio flares and their relation with X-ray flares, as well as improved constraints on the overall high-energy irradiation of their surroundings, including protoplanetary disks. Our astrometric follow-up of all identified VLA targets in Orion is the largest VLBA survey for YSO emission to date. Other than providing a nonthermal census, I will additionally discuss the use of the VLBA for precision stellar astrometry in the Gaia era, highlighting how VLBI astrometry is allowing us to extend the Gaia sample of YSOs and ultracool dwarfs by including embedded objects, distant obscured sources in the Galactic plane, and faint ultracool dwarfs, while providing important opportunities for astrometric cross-calibration. I will conclude with a first look at the millimeter continuum emission of the Orion radio stars in the inner ONC.
Leave a Comment
Last Updated: 11th December 2019 by Simon Purser
2020-01-30, 11:00: Dr. J. Forbrich (University of Hertfordshire)
Dr. J. Forbrich
University of Hertfordshire, UK
The Orion Radio All-Stars: new insights into YSO radio emission, using the VLA, VLBA, and ALMA
Abstract : With significant new observing capabilities, centimeter-wavelength radio astronomy is currently in a renaissance leading up to the advent of the Square Kilometre Array (SKA). The sensitivity upgrades of both the NRAO Very Large Array (VLA) and the Very Long Baseline Array (VLBA) have begun to provide us with a much improved perspective on stellar centimeter radio emission, particularly concerning young stellar objects (YSOs) and ultracool dwarfs. For the first time we now have systematic access to the radio time domain. I will mainly present a deep VLA and VLBA radio survey of the Orion Nebula Cluster (ONC), where we have found hundreds of compact radio sources, a sevenfold increase over previous studies, and intricate detail on the radio emission of proplyds. With simultaneous radio-X-ray time domain information (Chandra), this project is providing first constraints on YSO radio flares and their relation with X-ray flares, as well as improved constraints on the overall high-energy irradiation of their surroundings, including protoplanetary disks. Our astrometric follow-up of all identified VLA targets in Orion is the largest VLBA survey for YSO emission to date. Other than providing a nonthermal census, I will additionally discuss the use of the VLBA for precision stellar astrometry in the Gaia era, highlighting how VLBI astrometry is allowing us to extend the Gaia sample of YSOs and ultracool dwarfs by including embedded objects, distant obscured sources in the Galactic plane, and faint ultracool dwarfs, while providing important opportunities for astrometric cross-calibration. I will conclude with a first look at the millimeter continuum emission of the Orion radio stars in the inner ONC.
Category: Future Seminars, Seminars
The final #Syngeweek part is now live on our website. "Yet meet we shall, and part and meet again Where dead men meet, on lips of living men." dias.ie/2020/03/23/syn… Returning visitors don't forget to clear your cookies! #DIASdiscovers
Today is the 25th anniversary of the passing of Professor J.L Synge. Part 6 and the final #SyngeWeek installment will go live this evening on our website at 6pm #DIASdiscovers
What a great idea! 👩🚀👩🚀 twitter.com/SpaceStnExplor…
#SyngeWeek Part5 is now live on our website! "One of the attractions [of coming to DIAS] for me in 1948 was the prospect of being a colleague of Schrödinger. " Read more: dias.ie/2020/03/23/syn… Returning visitors remember to clear those cookies! #DIASdiscovers
Part 5 of #SyngeWeek covers his career with DIAS, the publication of "Relativity:The General Theory" which made DIAS the leading centre for research in General relativity for the following decade. Part 4 is availble until 6pm: dias.ie/2020/03/23/syn… #DIASdiscovers
On tonight! Don't miss your chance to see this fascinating documentary about Schroedinger's time in DIAS and the seminal discovery it lead to. Not forgetting he was DIAS' first Director of Theoretical Physics. @RTEOne #DIASdiscovers #schrodinger
Returning Visitors please remember to clear those cookies!
"...sometime early in 1944, I got a phone call from Oswald Veblen, asking me whether I would like to go to Europe attached to the American Army in a scientific capacity." #SyngeWeek Part 4: Columbus & Europe is now live on our website ➡️ dias.ie/2020/03/23/syn… #DIASdiscovers
Spring Newsletter just launched! See what has happened in 2020 so far: mailchi.mp/5ea85f227dce/d… Subscribe to our mailing list today to get future editions direct to your mailbox: dias.ie/mailinglistsub… #DIASdiscovers
"...he wanted to endow international medals in mathematics (a subject omitted from Nobel Prizes, on account of Nobel's jealousy of Mittag-Leffler..." #SyngeWeek Part 3: Toronto-Dublin-Toronto dias.ie/2020/03/23/syn… Returning visitors please remember to clear those cookies 🍪
"Long before 1916 I had become a Nationalist, but the idea that there might be an armed rebellion was nothing more than a whispered rumour..." #SyngeWeek part 3 will be posted on our website this evening at 6pm. Part 2: University is available until then: dias.ie/2020/03/23/syn…
Please note the reopening date of DIAS buildings is now 20 April. dias.ie/2020/03/13/ale… #coronavirus #StayHomeSaveLives
#SyngeWeek Part Two: University, is now live on our website. "...could force the rifle down the leg of his trousers, and we set out through the Front Gate of College; " ➡️dias.ie/2020/03/23/syn… Returning visitors please be sure to clear those cookies🍪 #DIASdiscovers
#SyngeWeek part 2 is coming this evening. This will cover his University years. J.L. Synge, an Irish mathematician & physicist, whose seven decade career included significant periods in Ireland (& DIAS) Canada, and the USA. Part 1 ➡️ dias.ie/2020/03/23/syn… #DIASdiscovers
"My mother was Ellen Frances Price (1861-1935), daughter of James Price, a distinguished Irish engineer. I believe that, in so far as it was genetic, my interest in mathematics came from this side of the family."- J.L Synge More: dias.ie/2020/03/23/syn… #SyngeWeek #DIASdiscovers