J/A+A/643/A15 The tidal tails in NGC7099 (Piatti+, 2020)
The elusive tidal tails of the Milky Way globular cluster NGC 7099.
Piatti A.E., Carballo-Bello J.A., Mora M.D., Cenzano C., Navarrete C.,
Catelan M.
<Astron. Astrophys. 643, A15 (2020)>
=2020A&A...643A..15P 2020A&A...643A..15P (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, globular ; Photometry, SDSS
Keywords: methods: observational - techniques: photometric -
Abstract:
We present results on the extra-tidal features of the Milky Way
globular cluster NGC 7099, using deep gr photometry obtained with the
Dark Energy Camera (DECam). We reached nearly 6mag below the
cluster's main sequence (MS) turnoff, so that we dealt with the most
suitable candidates to trace any stellar structure located beyond the
cluster tidal radius. From star-by-star reddening corrected
color-magnitude diagrams (CMDs), we defined four adjacent strips along
the MS, for which we built the respective stellar density maps, once
the contamination by field stars was properly removed. The resulting,
cleaned, field star stellar density maps show a short tidal tail and
some scattered debris. Such extra-tidal features are hardly detected
when much shallower Gaia DR2 data sets are used and the same CMD field
star cleaning procedure is applied. Indeed, by using 2.5mag below the
MS turnoff of the cluster as the faintest limit (G<20.5mag), cluster
members turned out to be distributed within the cluster's tidal
radius, and some hints for field star density variations are found
across a circle of radius 3.5° centered on the cluster and with
similar CMD features as cluster stars. The proper motion distribution
of these stars is distinguishable from that of the cluster, with some
superposition, which resembles that of stars located beyond 3.5°
from the cluster center.
Description:
DECam photometric data collected and used in this work (no table in
the article, see Section 2).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
photom.dat 73 78265 g,r magnitudes of stars in the field of NGC7099
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See also:
J/AJ/112/1061 : BV photometry of NGC 7099 (Bergbusch 1996)
J/A+A/462/L9 : Radial velocities in NGC 7099 (Scarpa+, 2007)
J/ApJ/657/286 : Chandra X-ray sources in M30 (NGC 7099) (Lugger+, 2007)
J/ApJ/740/60 : NGC2419 & NGC7099 RGB stars equivalent widths (Cohen+, 2011)
J/A+A/555/A36 : VrI light curves of NGC7099 variables (Kains+, 2013)
J/ApJ/801/67 : Grid of binary colors in M30 (NGC7099) (Xin+, 2015)
Byte-by-byte Description of file: photom.dat
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Bytes Format Units Label Explanations
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2- 7 I6 --- ID [7/286502] Star number
9- 19 F11.7 deg RAdeg Rigth ascension (J2000)
21- 31 F11.7 deg DEdeg Declination (J2000)
33- 38 F6.3 mag gmag g magnitude
41- 45 F5.3 mag e_gmag rms uncertainty on gmag
47- 52 F6.3 mag rmag r magnitude
55- 59 F5.3 mag e_rmag rms uncertainty on rmag
62- 66 F5.3 mag E(B-V) Reddening, E(B-V)
69- 73 F5.3 mag e_E(B-V) rms uncertainty on E(B-V)
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Acknowledgements:
Andres Piatti, andres.piatti(at)unc.edu.ar
(End) Patricia Vannier [CDS] 09-Sep-2020