J/A+A/662/A11 Milky Way's Nuclear Stellar Disc pm catalog (Shahzamanian+, 2022)
A proper motion catalogue for the Milky Way's nuclear stellar disc.
Shahzamanian B., Schoedel R., Nogueras-Lara F., Martinez-Arranz A.,
Sormani M., Gallego-Cano E., Gallego-Calvente A.T., Gallego-Cano E.,
Alburai A.
<Astron. Astrophys. 662, A11 (2022)>
=2022A&A...662A..11S 2022A&A...662A..11S (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Galactic center ; Proper motions
Keywords: Galaxy: center - Galaxy: structure - infrared: general -
proper motions
Abstract:
We present the results of a large-scale proper motion study of the
central ∼36'x16' of the Milky Way, based on our high angular
resolution GALACTICNUCLEUS survey (epoch 2015) combined with the HST
Paschen-alpha survey (epoch 2008). Our catalogue contains roughly
80000 stars, an unprecedented kinematic data set for this region. We
describe the data analysis and the preparation of the proper motion
catalogue. We verify the catalogue by comparing our results with
measurements from previous work and data. We provide a preliminary
analysis of the kinematics of the studied region. Foreground stars in
the Galactic Disc can be easily identified via their small reddening.
Consistent with previous work and with our expectations, we find that
stars in the nuclear stellar disc have a smaller velocity dispersion
than Bulge stars, in particular in the direction perpendicular to the
Galactic Plane. The rotation of the nuclear stellar disc can be
clearly seen in the proper motions parallel to the Galactic Plane.
Stars on the near side of the nuclear stellar disc are less reddened
than stars on its far side. Proper motions enable us to detect
co-moving groups of stars that may be associated with young clusters
dissolving in the Galactic Centre that are difficult to detect by
other means. We demonstrate a technique based on a density clustering
algorithm that can be used to find such groups of stars.
Description:
Proper motion catalogue obtained from two surveys of GALACTICNUCLEUS
(epoch 2015) and Paschen-alpha (epoch 2008) for stars in the central
∼36'x16' of the Milky Way.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 88 77414 Proper motion catalogue for the
Milky Way's Nuclear Stellar Disc
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See also:
J/A+A/632/A116 : Proper motion catalogue of Galactic Centre
(Shahzamanian+, 2019)
J/A+A/631/A20 : GALACTICNUCLEUS JHKs imaging survey. II.
(Nogueras-Lara+, 2019)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension (J2000) (ra)
11- 17 F7.5 arcsec e_RAdeg Uncertainty on RA (dra)
19- 27 F9.5 deg DEdeg Declination (J2000) (dec)
29- 35 F7.5 arcsec e_DEdeg Uncertainty on Dec (ddec)
37- 44 F8.5 mag Hmag H-band magnitude (H)
46- 52 F7.5 mag e_Hmag Uncertainty on H-band magnitude (dH)
54- 62 F9.5 mas/yr pml Proper motions in the direction
parallel to the Galactic Plane (mu_l)
64- 70 F7.5 mas/yr e_pml Uncertainty on mu_l (dmu_l)
72- 80 F9.5 mas/yr pmb Proper motions in the direction
perpendicular to the Galactic Plane (mu_b)
82- 88 F7.5 mas/yr e_pmb Uncertainty on mu_b (dmu_b)
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History:
From Banafsheh Shahzamanian, shahzaman(at)iaa.es
Acknowledgements:
The authors would like to thank the anonymous referee for the helpful
comments on this paper. B.Sh, R.S, and A.T.G.C acknowledge financial
support from the State Agency for Research of the Spanish MCIU through
the "Center of Excellence Severo Ochoa" award for the Instituto de
Astrofisica de Andalucia (SEV-2017-0709). B.Sh, A.T.G.C, A.A, and R.S
acknowledge financial support from national project
PGC2018-095049-B-C21 (MCIU/AEI/FEDER, UE). F.N.L and M.C.S gratefully
acknowledge support by the Deutsche Forschungsgemeinschaft (DFG,
German Research Foundation) Project-ID 138713538 SFB 881 (The Milky
Way System, subproject B8). M.C.S furthermore acknowledges support
from the ERC via the ERC Synergy Grant "ECOGAL" (grant 855130).
F.N.L acknowledges the sponsorship provided by the Federal Ministry
for Education and Research of Germany through the Alexander von
Humboldt Foundation. This work is based on observations made with ESO
Telescopes at the La Silla Paranal Observatory under programmes IDs
195.B-0283. We thank the staff of ESO for their great efforts and
helpfulness. This research is based on observations made with the
NASA/ESA Hubble Space Telescope obtained from the Space Telescope
Science Institute, which is operated by the Association of
Universities for Research in Astronomy, Inc., under NASA contract NAS
5-26555. These observations are associated with programs 11671,
12318, 12667, and 14613.
References:
Shahzamanian, B., 2019A&A...632A.116N 2019A&A...632A.116N, Cat. J/A+A/632/A116
Nogueras-Lara F., 2018A&A...610A..83N 2018A&A...610A..83N, Cat. J/A+A/610/A83
Nogueras-Lara F., 2019A&A...631A..20N 2019A&A...631A..20N, Cat. J/A+A/631/A20
(End) B. Shahzamanian [IAA-CSIC, Spain], P. Vannier [CDS] 15-Mar-2022