HubPUG: proper motions for local group dwarfs observed with HST utilizing Gaia as a reference frame. Issue 1 (12th December 2022)
- Record Type:
- Journal Article
- Title:
- HubPUG: proper motions for local group dwarfs observed with HST utilizing Gaia as a reference frame. Issue 1 (12th December 2022)
- Main Title:
- HubPUG: proper motions for local group dwarfs observed with HST utilizing Gaia as a reference frame
- Authors:
- Warfield, Jack T
Kallivayalil, Nitya
Zivick, Paul
Fritz, Tobias
Richstein, Hannah
Sohn, Sangmo Tony
del Pino, Andrés
Savino, Alessandro
Weisz, Daniel R - Abstract:
- ABSTRACT: We present the method behind HubPUG, a software tool built for recovering systemic proper motions (PMs) of targets (e.g. clusters or resolved galaxies) in Hubble Space Telescope ( HST ) fields with two epochs of observations by utilizing stars observed by Gaia as a foreground frame of reference. HST PM experiments have typically relied on the use of distant background galaxies or quasi-stellar objects (QSOs) as stationary sources against which to measure PMs. Without consistent profiles, background galaxies are more difficult to centroid, but benefit on-aggregate from their large numbers. QSOs, though they can be fit with stellar point-spread functions, are sparse, with most fields containing none. Historically, the use of stars as references against which to measure PMs would have been difficult because they have individual PMs of their own. However, Gaia has now provided positions and PMs for over 1.4 billion stars, which are much more likely to be well-imaged in the fields around targets versus background sources, have predictable stellar profiles, and require less observing time per-image for good signal-to-noise. This technique allows us to utilize the power of Gaia to measure the PM of targets too faint for Gaia to observe itself. We have recovered PMs for the Milky Way satellites Sculptor and Draco with comparable uncertainties over HST -only and Gaia -only measurements, limited primarily by the current capabilities of the Gaia data. We also show the promiseABSTRACT: We present the method behind HubPUG, a software tool built for recovering systemic proper motions (PMs) of targets (e.g. clusters or resolved galaxies) in Hubble Space Telescope ( HST ) fields with two epochs of observations by utilizing stars observed by Gaia as a foreground frame of reference. HST PM experiments have typically relied on the use of distant background galaxies or quasi-stellar objects (QSOs) as stationary sources against which to measure PMs. Without consistent profiles, background galaxies are more difficult to centroid, but benefit on-aggregate from their large numbers. QSOs, though they can be fit with stellar point-spread functions, are sparse, with most fields containing none. Historically, the use of stars as references against which to measure PMs would have been difficult because they have individual PMs of their own. However, Gaia has now provided positions and PMs for over 1.4 billion stars, which are much more likely to be well-imaged in the fields around targets versus background sources, have predictable stellar profiles, and require less observing time per-image for good signal-to-noise. This technique allows us to utilize the power of Gaia to measure the PM of targets too faint for Gaia to observe itself. We have recovered PMs for the Milky Way satellites Sculptor and Draco with comparable uncertainties over HST -only and Gaia -only measurements, limited primarily by the current capabilities of the Gaia data. We also show the promise of this method for satellites of M31 with a new PM measurement for Andromeda VII. … (more)
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 519:Issue 1(2023)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 519:Issue 1(2023)
- Issue Display:
- Volume 519, Issue 1 (2023)
- Year:
- 2023
- Volume:
- 519
- Issue:
- 1
- Issue Sort Value:
- 2023-0519-0001-0000
- Page Start:
- 1189
- Page End:
- 1200
- Publication Date:
- 2022-12-12
- Subjects:
- proper motions -- galaxies: dwarf -- galaxies: kinematics and dynamics -- Local Group
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/stac3647 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 24767.xml