J/ApJ/738/186 HST and DEIMOS measurements of NGC 2419 stars (Ibata+, 2011)
The globular cluster NGC 2419: a crucible for theories of gravity.
Ibata R., Sollima A., Nipoti C., Bellazzini M., Chapman S.C.,
Dalessandro E.
<Astrophys. J., 738, 186 (2011)>
=2011ApJ...738..186I 2011ApJ...738..186I
ADC_Keywords: Clusters, globular ; Radial velocities ; Abundances, [Fe/H] ;
Photometry, HST ; Spectroscopy ; Stars, fundamental
Keywords: dark matter - galaxies: clusters: individual (NGC 2419) - gravitation
Abstract:
We present the analysis of a kinematic data set of stars in the
globular cluster NGC 2419, taken with the DEep Imaging Multi-Object
Spectrograph at the Keck II telescope. Combined with a reanalysis of
deep Hubble Space Telescope and Subaru Telescope imaging data, which
provide an accurate luminosity profile of the cluster, we investigate
the validity of a large set of dynamical models of the system, which
are checked for stability via N-body simulations.
Description:
The main spectroscopic observations presented here were taken with the
DEep Imaging Multi-Object Spectrograph (DEIMOS) mounted on the Keck II
telescope at Mauna Kea, Hawaii on 2008 October 27. Target stars were
selected from the Bellazzini (2007A&A...473..171B 2007A&A...473..171B) catalog with I<20
and within a narrow color-magnitude region around the cluster RGB, as
shown in Figure 4(e). Two masks milled with slitlets for 85 and 77
targets were observed with exposure times of 3x1200s and 3x1000s,
respectively (we will henceforth refer to these as masks 1 and 2).
The main photometric data set, which serves to determine the stellar
surface brightness profile of the cluster, is derived from images
taken with the Advanced Camera for Surveys (ACS) on board the Hubble
Space Telescope (HST) and much wider-field images taken with the
Suprime-Cam camera on the Subaru Telescope, as derived by Dalessandro
et al. 2008, Cat J/ApJ/681/311.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 88 197 Spectroscopic measurements with the corresponding
photometry
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
B/cfht : Log of CFHT Exposures (CADC, 1979-)
J/AJ/141/81 : NGC 2419 variable star population (Di Criscienzo+, 2011)
J/ApJ/682/1217 : Abundances in red giants in 7 globular clusters (Kirby+, 2008)
J/ApJ/681/311 : Blue stragglers in NGC 2419 (Dalessandro+, 2008)
J/AJ/136/2259 : HST photometry of stars in NGC 2419 (Sandquist+, 2008)
J/PASP/117/37 : BVRI photometry in NGC 2419, Pal 4, and Pal 14 (Saha+, 2005)
J/A+A/391/945 : HST photometry of 74 globular clusters (Piotto+, 2002)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/178] Star running sequence number
5- 8 A4 --- --- [Mask]
10 I1 --- Mask [1/2]? Mask number
12- 14 A3 --- --- [B09]
16- 21 A6 --- B09 Baumgardt et al. (2009MNRAS.396.2051B 2009MNRAS.396.2051B)
identification (1)
23 I1 h RAh [7] Hour of right ascension (J2000)
25- 26 I2 min RAm [37/38] Minute of right ascension (J2000)
28- 32 F5.2 s RAs Second of right ascension (J2000)
34 A1 --- DE- [+] Sign of declination (J2000)
35- 36 I2 deg DEd [38] Degree of declination (J2000)
38- 39 I2 arcmin DEm [43/56] Arcminute of declination (J2000)
41- 44 F4.1 arcsec DEs Arcsecond of declination (J2000)
46- 53 F8.3 km/s RV [-161/49] Radial velocity
55- 59 F5.3 km/s e_RV [0.4/4.5] RV uncertainty
61- 66 F6.3 mag Imag [15.635/19.99] HST I-band magnitude
68- 72 F5.3 mag V-I V-I color index
74- 79 F6.3 [Sun] [Fe/H] [-3.6/-0.7] Metallicity
81- 86 F6.3 arcmin R [0.082/13.018] Projected radial distance R
from the cluster center
88 A1 --- Obs [y/n] Multiple observations? (2)
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Note (1): Identifications in Simbad as:
SNN = <[BCH2009] SNN> (Baumgardt et al. 2009MNRAS.396.2051B 2009MNRAS.396.2051B)
RRRNNN = <Cl* NGC 2419 RHA RRR-NNN> (Racine & Harris 1975ApJ...196..413R 1975ApJ...196..413R)
NN = <Cl* NGC 2419 RH NN> (Racine & Harris 1975ApJ...196..413R 1975ApJ...196..413R)
Note (2): For those stars that have multiple measurements, we adopt the
measurement with the lowest uncertainty.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 23-Jan-2013