J/ApJ/929/89 Gaia EDR3 trailing & leading tidal tail of M2 (Grillmair, 2022)
The extended tidal tails of NGC 7089 (M2).
Grillmair C.J.
<Astrophys. J., 929, 89 (2022)>
=2022ApJ...929...89G 2022ApJ...929...89G
ADC_Keywords: Associations, stellar; Galaxies, nearby; Proper motions;
Photometry; Colors; Optical
Keywords: Stellar streams ; Galaxy structure
Abstract:
Using photometry and proper motions from Gaia Early Data Release 3, we
detect a 45° long trailing stellar debris stream associated with
the old, metal- poor globular cluster NGC 7089. With a width on the
order of 100 pc, the extended stream appears to be as dynamically cold
as the coldest known streams found to date. There is some evidence for
an extended leading tail extending between 28° and 37° from
the cluster, though the greater distance of this tail, combined with
proper motions that are virtually indistinguishable from those of
foreground stars, make the detection much less certain. The proper
motion profile and the path on the sky of the trailing tail are not
well matched using a simple Galactic potential composed purely of a
disk, bulge, and spherical halo. However, the addition of a moving,
massive (M=1.88x1011M☉) Large Magellanic Cloud brings the
model predictions into much better agreement with the observables. We
provide tables of the most highly ranked candidate stream stars for
follow-up by ongoing and future spectroscopic surveys.
Objects:
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RA (ICRS) DE Designation(s)
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21 33 27.02 +00 49 23.6 NGC 7089 = M 2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 76 Candidate stream stars: trailing tail
table2.dat 64 49 Candidate stream stars: leading tail
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See also:
VII/195 : Globular Clusters in the Milky Way (Harris, 1996)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/MNRAS/474/2479 : Orbital parameters of globular clusters (Balbinot+, 2018)
J/A+A/616/A10 : Open clusters GaiaDR2 HR diagrams (Gaia Collaboration, 2018)
J/MNRAS/486/2995 : GD-1 stellar stream (Malhan+, 2019)
J/MNRAS/488/1535 : A tidal stream associated with M68 (Palau+, 2019)
J/MNRAS/484/2832 : Proper motions of MW globular clusters (Vasiliev, 2019)
J/ApJ/914/123 : Gaia DR2 and EDR3 stars with sp. follow-up (Ibata+, 2021)
J/MNRAS/505/5978 : Gaia EDR3 view on Gal. globular clusters (Vasiliev+, 2021)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/125] Running sequence number
5- 12 F8.4 deg RAdeg [281.2/350] Gaia EDR3 right ascension (ICRS)
at Ep=2016
14- 21 F8.4 deg DEdeg [-17/3] Gaia EDR3 declination (ICRS) at Ep=2016
23- 28 F6.3 mag Gmag [17.9/20.3] Gaia EDR3 G-band magnitude
30- 34 F5.3 mag Bp-Rp [0.58/1.3] Gaia EDR3 Bp-Rp color index
36- 40 F5.3 mas/yr pmRA [0.16/8.5] Gaia EDR3 proper motion in right
ascension (µα*cosδ)
42- 46 F5.3 mas/yr e_pmRA [0.14/1.2] pmRA uncertainty
48- 53 F6.3 mas/yr pmDE [-5/-1.2] Gaia EDR3 proper motion in declination
(µδ)
55- 59 F5.3 mas/yr e_pmDE [0.1/0.9] pmDE uncertainty
61- 64 F4.2 --- Weight [0.07/1] Relative weight
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 07-Mar-2024