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J/A+A/525/A148     Radial velocities in two globular clusters   (Scarpa+, 2011)

Testing newtonian gravity with distant globular clusters: NGC 1851 and NGC 1904. Scarpa R., Marconi G., Carraro G., Falomo R., Villanova S. <Astron. Astrophys., 525, A148 (2011)> =2011A&A...525A.148S
ADC_Keywords: Clusters, globular ; Radial velocities Keywords: gravitation - globular clusters: general Abstract: Globular clusters are useful for testing the validity of Newtonian dynamics in the low acceleration regime typical of galaxies, without the complications of non-baryonic dark matter. In the absence of disturbing effects, such as tidal heating, the velocity dispersion of globular clusters is expected to vanish at large radii. If this is not observed, and in particular if, as observed in elliptical galaxies, the dispersion is found to be constant at large radii below a certain threshold acceleration, this might indicate a breakdown of Newtonian dynamics. To minimize the effects of tidal heating that can increase the velocity dispersion at large radii, we study the velocity dispersion profile of two distant globular clusters, NGC 1851 and NGC 1904. The velocity dispersion profile is derived from accurate radial velocity measurements, obtained at the ESO 8m VLT telescope with the FLAMES multi-object spectrograph. Reliable data for 184 and 146 bona fide cluster star members were obtained for NGC 1851 and NGC 1904, respectively. Description: Spectroscopic observations were obtained with FLAMES+GIRAFFE at the ESO 8-meter VLT telescope. FLAMES is a fiber multi-object spectrograph, allowing the simultaneous observation of up to 130 objects. For each configuration five separate 3200s exposures were obtained on different night from November 2007 to March 2008. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 51 199 Radial velocities of stars in NGC 1851 table3.dat 51 173 Radial velocities of stars in NGC 1904
Byte-by-byte Description of file: table2.dat table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Sequential number within the table 5- 9 I5 --- ID ID number 11- 12 I2 h RAh Right ascension (J2000) 14- 15 I2 min RAm Right ascension (J2000) 17- 21 F5.2 s RAs Right ascension (J2000) 23 A1 --- DE- Declination sign (J2000) 24- 25 I2 deg DEd Declination (J2000) 27- 28 I2 arcmin DEm Declination (J2000) 30- 33 F4.1 arcsec DEs Declination (J2000) 35- 39 F5.1 km/s HRV Heliocentric radial velocity 41- 43 F3.1 km/s e_HRV rms uncertainty on HRV 45- 46 I2 --- o_HRV Number of spectra available for this star 48- 51 F4.1 mag Vmag V magnitude
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 16-May-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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