J/A+A/632/A116 Proper motion catalogue of Galactic Centre (Shahzamanian+, 2019)
First results from a large-scale proper motion study of the Galactic Centre.
Shahzamanian B., Schoedel R., Nogueras-Lara F., Dong H.,
Gallego-Cano E., Gallego-Calvente A.T., Gardini A.
<Astron. Astrophys. 632, A116 (2019)>
=2019A&A...632A.116S 2019A&A...632A.116S (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Galactic center ; Proper motions
Keywords: Galaxy: center - infrared: general - proper motions
Abstract:
Proper motion studies of stars in the centre of the Milky Way have
typically been limited to the Arches and Quintuplet clusters, and to
the central parsec. Here we present the first results of a large-scale
proper motion study of stars within several tens of parsecs of
Sagittarius A* based on our 0.2" angular resolution GALACTICNUCLEUS
survey (epoch 2015) combined with NICMOS/HST data from the
Paschen-alpha survey (epoch 2008). This comprises the first
extensive proper motion study of the central ∼36'x16' of the Galaxy,
which is not covered adequately by any of the existing astronomical
surveys, such as Gaia, because of the extreme interstellar
extinction(AV≳30mag). Proper motions can help us to disentangle the
different stellar populations along the line-of-sight and interpret
their properties in combination with multi-wavelength photometry from
GALACTICNUCLEUS and other sources. It also allows us to infer the
dynamics and interrelationships between different stellar components
(Galactic bulge, nuclear stellar disk, nuclear stellar cluster) of the
Galactic centre (GC). In particular, we use proper motions to detect
co-moving groups of stars which are able to trace low-mass or
partially-dissolved young clusters in the GC that can hardly be
discovered by any other means. Our pilot study for this work is based
on a field in the nuclear bulge associated with Hii regions that show
the presence of young stars. We have detected the first group of
co-moving stars coincident with an HII region. Using colour-magnitude
diagrams, we have inferred that the co-moving stars are consistent
with the post-main sequence stars with ages of few Myr. Simulations
show that this group of stars is a real group that can indicate the
existence of a dissolving or low-to-intermediate-mass young cluster. A
census of these undiscovered clusters will ultimately help us to
constrain star formation at the GC in the past few ten Myr.
Description:
Proper motion catalogue obtained from two surveys of GALACTICNUCLEUS
(epoch 2015) and Paschen-alpha (epoch 2008) for stars in chip #1 of
pointing 19 of GALACTICNUCLEUS survey.
File Summary:
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FileNam Lrecl Records Explanations
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ReadMe 80 . This file
f19.dat 86 445 Proper motion catalogue for chip #1 of pointing 19
(corrected version, 15-Apr-2020)
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See also:
J/A+A/610/A83 : GALACTICNUCLEUS JHKs imaging survey (Nogueras-Lara+, 2018)
J/A+A/631/A20 : GALACTICNUCLEUS JHKs imaging survey. II. (Nogueras-Lara+, 2019)
Byte-by-byte Description of file: f19.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- 61 F8.5 mas/yr pmX Significant proper motions in the direction
parallel to the Galactic Plane (pmx)
63- 69 F7.5 mas/yr e_pmX Uncertainty on pmx (dpmx)
71- 78 F8.5 mas/yr pmY Significant proper motions in the direction
perpendicular to the Galactic Plane (pmy)
80- 86 F7.5 mas/yr e_pmY Uncertainty on pmy (dpmy)
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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. The research lead- ing to these results has
received funding from the European Research Council under the European
Union;s Seventh Framework Programme (FP7/2007-2013) / ERC grant
agreement no [614922]. This work is based on observations made with
ESO Telescopes at the La Silla Paranal Observatory under programmes
IDs 195.B-0283 and 091.B- 0418. We thank the staff of ESO for their
great efforts and helpfulness. B.Sh, R.S, F.N.L, E.G.C, 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). F.N.L
acknowledges financial support from a predoctoral contract of the
Spanish Ministerio de Educacion, Cultura y Deporte, code FPU14/01700.
References:
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
History:
12-Dec-2019: on-line version
15-Apr-2020: Corrected version (from author)
(End) Patricia Vannier [CDS] 02-Dec-2019