- ID:
- ivo://CDS.VizieR/J/AZh/96/267
- Title:
- Globular clusters abundances and kinematics
- Short Name:
- J/AZh/96/267
- Date:
- 22 Feb 2022
- Publisher:
- CDS
- Description:
- For the catalog, we compiled the abundances of 28 chemical elements: alpha-elements (O, Mg, Si, Ca, Ti), carbon, iron-peak elements(Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn), slow and rapid neutron-capture elements (Sr, Y, Zr, Mo, Ba, La, Ce, Nd, Eu, Dy) and three odd-Z elements(Na, Al, K) in the stars of 69 globular clusters. The data are taken from 101 papers published from 1986 to 2018. The abundances of chemical elements in stars of the clusters in almost all the used papers are determined from high-resolution spectra obtained mainly for the atmospheres of red giants. The spectra are analyzed with the local thermodynamic equilibrium approximation.
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- ID:
- ivo://CDS.VizieR/J/AJ/105/1762
- Title:
- Globular clusters around NGC 1399
- Short Name:
- J/AJ/105/1762
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have obtained integrated Washington photometry (C,M,T1) of globular cluster candidates in the field of NGC 1399. This galaxy, the dominant object in the Fornax cluster, shares with NGC 4486 (M87) the property of possessing one of the largest known specific frequencies of globulars. Conflicting evidence on the presence of a B-V color gradient as a function of galactocentric distance has been reported for this cluster system. Here we investigate the existence of a gradient using the C-T1 index, which is twice as metallicity sensitive as B-V. A small gradient is detected. This color gradient, in the sense that outer clusters are bluer, amounts to approx. 0.1 mag in C-T1 over a galactocentric range from about 0.5 to 3.5 arcmin, corresponding to a difference of approx. 0.2 dex in metallicity. This confirms qualitatively the B-V gradient suggested by Bridges et al. [AJ, 101, 469 (1991)]. Photometry for 420 globular cluster candidates is presented. Metal abundances internally precise to approx. 0.25 dex and accurate to approx. 0.3 dex have been obtained for some 250 of the best candidates, after statistically subtracting a field contamination estimated at 30%. The mean abundance of -0.9 +/- 0.2 confirms previous indications that the NGC 1399 globular cluster system is, on average, significantly more metal rich than that of the Galaxy, as expected from the relative parent galaxy luminosities. Approximately 10% of the clusters exceed solar abundance, similar to the case for NGC 5128. The signature of possible globular cluster formation in mergers, as suggested by Ashman and Zepf [ApJ, 384, 50 (1992)], is found in the distinct peaks in the metallicity distribution function. However, their prediction (based on a simple theory designed only for application to normal elliptical galaxies and not the more complicated cD galaxies represented by NGC 1399) that the color difference between the clusters and the background halo light monotonically increases with radius is not borne out by the observations. The difference decreases with radius from the center to approx. 2 arcmin; beyond this radius, the difference does appear to increase, however. At all radii, the mean globular cluster abundance is some 0.25-0.5 dex more metal poor than that of the background halo.
- ID:
- ivo://CDS.VizieR/J/A+A/477/L9
- Title:
- Globular clusters around NGC 1399
- Short Name:
- J/A+A/477/L9
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We investigate whether the globular clusters (GCs) in the recently published sample of GCs in the Fornax cluster by Bergond and coworkers are indeed intra-cluster objects. ************************************************************************** * * * Sorry, but the author(s) never supplied the tabular material * * announced in the paper * * * **************************************************************************
- ID:
- ivo://CDS.VizieR/J/AJ/127/2114
- Title:
- Globular clusters around NGC 1399
- Short Name:
- J/AJ/127/2114
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Radial velocities of 468 globular clusters around NGC 1399, the central galaxy in the Fornax cluster, have been obtained with FORS2 and the Mask Exchange Unit (MXU) at the ESO Very Large Telescope. This is the largest sample of globular cluster velocities around any galaxy obtained so far. The mean velocity uncertainty is 50km/s. This data sample is accurate and large enough to be used in studies of the mass distribution of NGC 1399 and the properties of its globular cluster system. Here we describe the observations and the reduction procedure, and we discuss the uncertainties of the resulting velocities. The complete sample of cluster velocities that is used in a dynamical study of NGC 1399 is tabulated. A subsample is compared with previously published values.
- ID:
- ivo://CDS.VizieR/J/AJ/137/4956
- Title:
- Globular clusters around NGC 1407
- Short Name:
- J/AJ/137/4956
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- NGC 1407 is the central elliptical in a nearby evolved group of galaxies apparently destined to become a galaxy cluster core. We use the kinematics of globular clusters (GCs) to probe the dynamics and mass profile of the group's center, out to a radius of 60kpc (~10 galaxy effective radii)-the most extended data set to date around an early-type galaxy. This sample consists of 172 GC line-of-sight velocities, most of them newly obtained using Keck/DEIMOS, with a few additional objects identified as dwarf-globular transition objects or as intragroup GCs.
- ID:
- ivo://CDS.VizieR/J/PAZh/33/403
- Title:
- Globular clusters as gravitational lenses
- Short Name:
- J/PAZh/33/403
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Based on the SDSS catalog, we have found new close quasar-galaxy pairs. We analyze the radial distribution of quasars from pairs around galaxies of different types. We show that the quasars from pairs follow the density profile of halo globular clusters. This is new observational evidence that the quasars projected onto the halos of galaxies are magnified by gravitational lensing by halo globular clusters.
- ID:
- ivo://CDS.VizieR/J/PAZh/29/253
- Title:
- Globular clusters as gravitational lenses
- Short Name:
- J/PAZh/29/253
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We argue that globular clusters (GCs) are good candidates for gravitational lenses in explaining quasar-galaxy associations. The catalog of associations (Bukhmastova, 2001, Cat. <J/AZh/78/675>) compiled from the LEDA catalog of galaxies (Paturel, 1997A&AS..124..109P) and from the catalog of quasars (Veron-Cetty and Vero, 1998, see Cat. <VII/235>) is used. Based on the new catalog, we show that one might expect an increased number of GCs around irregular galaxies of types 9 and 10 from the hypothesis that distant compact sources are gravitationally lensed by GCs in the halos of foreground galaxies. The King model is used to determine the central surface densities of 135 GCs in the Milky Way. The distribution of GCs in central surface density was found to be lognormal.
- ID:
- ivo://CDS.VizieR/J/A+A/296/680
- Title:
- Globular Clusters Djorg 1 and Pal 6
- Short Name:
- J/A+A/296/680
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present NTT V,I observations of Palomar 6 and Djorgovski 1, two obscured loose clusters in crowded fields. We derive a reddening of E(B-V)=1.33+/-0.10, a distance d_{sun}_=~8.9kpc, and a metallicity of [Fe/H]=~-0.4 for Pal 6, and E(B-V)=1.71+/-0.10, d_{sun}_=~8.8kpc, and a similar metallicity ([Fe/H]=~-0.4) for Djorg 1.
- ID:
- ivo://CDS.VizieR/J/ApJ/773/L27
- Title:
- Globular clusters in ACSVCS early-type galaxies
- Short Name:
- J/ApJ/773/L27
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a determination of the two-dimensional shape parameters of the blue and red globular cluster systems (GCSs) in a large number of elliptical galaxies and lenticular galaxies (early-type galaxies, called ETGs). We use a homogeneous data set of the globular clusters in 23 ETGs obtained from the HST/ACS Virgo Cluster Survey. The position angles of both blue and red GCSs show a correlation with those of the stellar light distribution, showing that the major axes of the GCSs are well aligned with those of their host galaxies. However, the shapes of the red GCSs show a tight correlation with the stellar light distribution as well as with the rotation property of their host galaxies, while the shapes of the blue GCSs do much less. These provide clear geometric evidence that the origins of the blue and red globular clusters are distinct and that ETGs may have dual halos: a blue (metal-poor) halo and a red (metal-rich) halo. These two halos show significant differences in metallicity, structure, and kinematics, indicating that they are formed in two distinguishable ways. The red halos might have formed via dissipational processes with rotation, while the blue halos are through accretion.
- ID:
- ivo://CDS.VizieR/J/AJ/127/24
- Title:
- Globular clusters in 4 cD galaxies
- Short Name:
- J/AJ/127/24
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have used WFPC2 on the Hubble Space Telescope (HST) to obtain F450W and F814W images of four cD galaxies (NGC 541 in Abell 194, NGC 2832 in Abell 779, NGC 4839 in Abell 1656, and NGC 7768 in Abell 2666) in the range 5400km/s<cz<8100km/s. For NGC 541, the HST data are supplemented by ground-based B and I images obtained with FORS1 on the Very Large Telescope.
