New Density Profile and Structural Parameters of the Complex Stellar System Terzan 5

Lanzoni, B.; Ferraro, F. R.; Dalessandro, E.; Mucciarelli, A.; Beccari, G.; Miocchi, P.; Bellazzini, M.; Rich, R. Michael; Origlia, L.; Valenti, E.; Rood, R. T.; Ransom, S. M.

doi:10.1088/0004-637x/717/2/653

Cited by 107 publications

(188 citation statements)

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“…6; see Ferraro et al 2009;Lanzoni et al 2010). While the overall survey will be described in a forthcoming paper (F. Ferraro et al, in preparation), in this work we focus on a subsample of stars representative of the field population surrounding Terzan 5.…”

Section: The Samplementioning

confidence: 99%

Chemical and Kinematical Properties of Galactic Bulge Stars Surrounding the Stellar System Terzan 5

Massari¹,

Mucciarelli²,

Ferraro³

et al. 2014

ApJ

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As part of a study aimed at determining the kinematical and chemical properties of Terzan 5, we present the first characterization of the bulge stars surrounding this puzzling stellar system. We observed 615 targets located well beyond the tidal radius of Terzan 5 and found that their radial velocity distribution is well described by a Gaussian function peaked at v rad = +21.0 ± 4.6 km s −1 with dispersion σ v = 113.0 ± 2.7 km s −1 . This is one of the few high-precision spectroscopic surveys of radial velocities for a large sample of bulge stars in such a low and positive latitude environment (b = +1.• 7). We found no evidence of the peak at v rad ∼ +200 km s −1 found in Nidever et al. Strong contamination of many observed spectra by TiO bands prevented us from deriving the iron abundance for the entire spectroscopic sample, introducing a selection bias. The metallicity distribution was finally derived for a subsample of 112 stars in a magnitude range where the effect of the selection bias is negligible. The distribution is quite broad and roughly peaked at solar metallicity ([Fe/H] +0.05 dex) with a similar number of stars in the super-solar and in the sub-solar ranges. The population number ratios in different metallicity ranges agree well with those observed in other low-latitude bulge fields, suggesting (1)

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Section: The Samplementioning

confidence: 99%

Chemical and Kinematical Properties of Galactic Bulge Stars Surrounding the Stellar System Terzan 5

Massari¹,

Mucciarelli²,

Ferraro³

et al. 2014

ApJ

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“…Terzan 5 hosts the largest population of millisecond pulsars (msPSRs) detected so far (33, Ransom 2008), and it exhibits the highest central stellar density among Galactic GCs (Lanzoni et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Multi-wavelength environment of the Galactic globular cluster Terzan 5

Clapson

Domainko

Jamrozy

et al. 2011

A&A

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Terzan 5 is a Galactic globular cluster exhibiting prominent X-ray and gamma-ray emission. Following the discovery of extended X-ray emission in this object, we explore here archival data at several wavelengths for other unexpected emission features in the vicinity of this globular cluster. Radio data from the Effelsberg 100-m telescope show several extended structures near Terzan 5, albeit with large uncertainties in the flux estimates and no reliable radio spectral index. In particular, a radio source extending from the location of Terzan 5 to the north-west could result from long-term non-thermal electron production by the large population of milli-second pulsars in this globular cluster. Another prominent radio structure close to Terzan 5 may be explained by ionised material produced by a field O star. As for the diffuse X-ray emission found in Terzan 5, its extension appears to be limited to within 2.5 arcmin of the globular cluster and the available multi-wavelength data is compatible with an inverse Compton scenario but disfavours a nonthermal Bremsstrahlung origin.

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“…The coordinates of the stars identified in each cluster have been converted from the "local" to the absolute astrometric system by using a well-tested procedure adopted by our group for more than 10 years (see, e.g., Lanzoni et al 2010 and references therein). Since only a few (if any) primary astrometric standards can be found in the central region of GCs, we usually complement HST photometry with ground-based wide-field imaging.…”

Section: Astrometry and Center Of Gravitymentioning

confidence: 99%

“…positions of the stars sampled in the ground-based catalogs. Cross-correlations of the catalogs and astrometric solutions were calculated with CataXcorr, a code developed and maintained by Paolo Montegriffo at the INAF-Bologna Astronomical Observatory (see, e.g., Lanzoni et al 2010;Bellazzini et al 2011). Finally, the positions of the stars in the WFPC2 data were transformed into the same celestial coordinate system by adopting ∼50 stars in common with the ground-based catalogs.…”

Section: Astrometry and Center Of Gravitymentioning

confidence: 99%

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The Central Blue Straggler Population in Four Outer-Halo Globular Clusters

Beccari

Lützgendorf

Olczak

et al. 2012

ApJ

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Using Hubble Space Telescope/Wide Field Planetary Camera 2 data, we have performed a comparative study of the Blue Straggler Star (BSS) populations in the central regions of the globular clusters (GCs) AM 1, Eridanus, Palomar 3, and Palomar 4. Located at distances R GC > 50 kpc from the Galactic center, these are (together with Palomar 14 and NGC 2419) the most distant clusters in the halo. We determine their color-magnitude diagrams and centers of gravity. The four clusters turn out to have similar ages (10.5-11 Gyr), significantly smaller than those of the inner-halo globulars, and similar metallicities. By exploiting wide-field ground-based data, we build the most extended radial density profiles from resolved star counts ever published for these systems. These are well reproduced by isotropic King models of relatively low concentration. BSSs appear to be significantly more centrally segregated than red giants in all GCs, in agreement with the estimated core and half-mass relaxation times which are smaller than the cluster ages. Assuming that this is a signature of mass segregation, we conclude that AM 1 and Eridanus are slightly dynamically more evolved than Pal 3 and Pal 4.

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New Density Profile and Structural Parameters of the Complex Stellar System Terzan 5

Cited by 107 publications

References 37 publications

Chemical and Kinematical Properties of Galactic Bulge Stars Surrounding the Stellar System Terzan 5

Chemical and Kinematical Properties of Galactic Bulge Stars Surrounding the Stellar System Terzan 5

Multi-wavelength environment of the Galactic globular cluster Terzan 5

The Central Blue Straggler Population in Four Outer-Halo Globular Clusters

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