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23701. Velocities of galaxies in A773
ID:
ivo://CDS.VizieR/J/A+A/467/37
Title:
Velocities of galaxies in A773
Short Name:
J/A+A/467/37
Date:
21 Oct 2021
Publisher:
CDS
Description:
To conduct an intensive study of the rich, X-ray luminous galaxy cluster Abell 773 at z=0.22 containing a diffuse radio halo to determine its dynamical status. Our analysis is based on new spectroscopic data obtained at the TNG telescope for 107 galaxies, 37 spectra recovered from the CFHT archive and new photometric data obtained at the Isaac Newton Telescope. We use statistical tools to select 100 cluster members (out to ~1.8h^-1^_70_ from the cluster centre), to analyse the kinematics of cluster galaxies and to determine the cluster structure. Our analysis is also performed by using X-ray data stored in the Chandra archive.
23702. Velocities of galaxies in Abell 520
ID:
ivo://CDS.VizieR/J/A+A/491/379
Title:
Velocities of galaxies in Abell 520
Short Name:
J/A+A/491/379
Date:
21 Oct 2021
Publisher:
CDS
Description:
The connection of cluster mergers with the presence of extended, diffuse radio sources in galaxy clusters is still debated. An interesting case is the rich, merging cluster Abell 520, containing a radio halo. A recent gravitational analysis has shown in this cluster the presence of a massive dark core suggested to be a possible problem for the current cold dark matter paradigm. We aim to obtain new insights into the internal dynamics of Abell 520 analyzing velocities and positions of member galaxies. Our analysis is based on redshift data for 293 galaxies in the cluster field obtained combining new redshift data for 8 galaxies acquired at the TNG with data obtained by CNOC team and other few data from the literature. We also use new photometric data obtained at the INT telescope. We combine galaxy velocities and positions to select 167 cluster members around z~0.201. We analyze the cluster structure using the weighted gap analysis, the KMM method, the Dressler-Shectman statistics and the analysis of the velocity dispersion profiles. We compare our results with those from X-ray, radio and gravitational lensing analyses.
23703. Velocities of globular clusters in Fornax
ID:
ivo://CDS.VizieR/J/A+A/464/L21
Title:
Velocities of globular clusters in Fornax
Short Name:
J/A+A/464/L21
Date:
21 Oct 2021
Publisher:
CDS
Description:
We acquired radial velocities of a significant number of globular clusters (GCs) on wide fields between galaxies in the nearby Fornax cluster of galaxies, in order to derive their velocity dispersion radial profile and to probe the dynamics of the cluster. We used FLAMES on the VLT to obtain accurate velocities for 149 GCs, within a ~500x150kpc strip centered on NGC 1399, the Fornax central galaxy. These objects are at the very bright tail (M_V_<~-9.5) of the GC luminosity function, overlapping the so-called "ultra-compact dwarfs" magnitude range. Eight of the brightest FLAMES-confirmed members indeed show hints of resolution in the subarcsecond pre-imaging data we used for selecting the ~500 targets for FLAMES spectroscopy.
23704. Velocities of globular clusters in M104
ID:
ivo://CDS.VizieR/J/AJ/147/150
Title:
Velocities of globular clusters in M104
Short Name:
J/AJ/147/150
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have obtained radial velocity measurements for 51 new globular clusters around the Sombrero galaxy. These measurements were obtained using spectroscopic observations from the AAOmega spectrograph on the Anglo-Australian Telescope and the Hydra spectrograph at WIYN. Combining our own past measurements and velocity measurements obtained from the literature, we have constructed a large database of radial velocities that contains a total of 360 confirmed globular clusters. Previous studies' analyses of the kinematics and mass profile of the Sombrero globular cluster system have been constrained to the inner ~9' (~24kpc or ~5R_e_), but our new measurements have increased the radial coverage of the data, allowing us to determine the kinematic properties of M104 out to ~15' (~41kpc or ~9R_e_). We use our set of radial velocities to study the GC system kinematics and to determine the mass profile and V-band mass-to-light profile of the galaxy. We find that M/L_V_ increases from 4.5 at the center to a value of 20.9 at 41kpc (~9R_e_ or 15'), which implies that the dark matter halo extends to the edge of our available data set. We compare our mass profile at 20kpc (~4R_e_or ~7.4') to the mass computed from X-ray data and find good agreement. We also use our data to look for rotation in the globular cluster system as a whole, as well as in the red and blue subpopulations. We find no evidence for significant rotation in any of these samples.
23705. Velocities of HII regions
ID:
ivo://CDS.VizieR/J/ApJ/582/756
Title:
Velocities of HII regions
Short Name:
J/ApJ/582/756
Date:
21 Oct 2021
Publisher:
CDS
Description:
Kinematic distance determinations in the inner Galaxy are hampered by the near-far kinematic distance ambiguity. Here we resolve the ambiguity for 49 HII region complexes with known recombination-line velocities in the first Galactic quadrant. We measured the 21cm HI absorption spectrum toward each source with the Very Large Array in the C array. The maximum velocity of HI absorption was used to discriminate between the near and far kinematic distances. The number ratio of far to near sources, ~3, can be entirely explained as a geometrical effect. The kinematic distances that we derive are compared with previous determinations for the same sources. Although our distance determinations are largely in agreement with previous measurements, there are 22 discrepancies that we discuss. Using our distance determinations, we create a face-on Galactic map of the HII region complexes and compare it with a kinematically derived profile of the distribution of CO-traced molecular hydrogen. The HII region complexes delineate the large-scale features seen in the molecular gas. The 5kpc molecular ring and the Sagittarius spiral arm are clearly evident, and a few HII region complexes lie in the Perseus arm.
23706. Velocities of individual stars in NGC 205
ID:
ivo://CDS.VizieR/J/AJ/131/332
Title:
Velocities of individual stars in NGC 205
Short Name:
J/AJ/131/332
Date:
21 Oct 2021
Publisher:
CDS
Description:
NGC 205 is the nearest example of a dwarf elliptical galaxy and the prototype of this enigmatic galaxy class. Photometric evidence suggests that NGC 205, a close satellite of the M31 galaxy, is tidally interacting with its parent galaxy. We present stellar radial velocity measurements out to a projected radius of 20' (5kpc) in NGC 205 based on Keck DEIMOS multislit spectroscopic observations of 725 individual red giant branch stars. Our kinematic measurements extend from the center out to 6 times the effective radius of NGC 205, well past the expected tidal radius. The contamination in our kinematic sample from M31 field stars is estimated to be a few percent based on maximum likelihood fits to the distribution of stars in position-velocity space.
23707. Velocities of interstellar lines in Sco-Cen
ID:
ivo://CDS.VizieR/J/A+A/512/A83
Title:
Velocities of interstellar lines in Sco-Cen
Short Name:
J/A+A/512/A83
Date:
21 Oct 2021
Publisher:
CDS
Description:
We want to make a large-scale study of the morphology, kinematics, and origin of the HI, which surrounds the Sco-Cen association. We combine our high-sensitivity southern HI survey with the Leiden/Dwingeloo Survey, considering l=240{deg}-400{deg}, b=-60{deg} to +60{deg}, and radial velocities of V=-41.8 to +40.8km/s. We point out the main HI branches surrounding the association and derive their kinematics. Kinematical HI-maps were compared with spatial maps of interstellar (IS) NaI from the literature. Upper limits for distances d were derived from optical IS absorption components from the literature. Models of expanding spherical HI shells were fitted around each stellar subgroup.
23708. Velocities of {lambda} Bootis stars
ID:
ivo://CDS.VizieR/J/A+A/412/447
Title:
Velocities of {lambda} Bootis stars
Short Name:
J/A+A/412/447
Date:
21 Oct 2021
Publisher:
CDS
Description:
We demonstrate that it is arduous to define the {lambda} Boo stars as a class of objects exhibiting uniform abundance peculiarities which would be generated by a mechanism altering the structure of their atmospheric layers. We collected the stars classified as {lambda} Boo up to now and discuss their properties, in particular the important percentage of confirmed binaries producing composite spectra (including our adaptive optics observations) and of misclassified objects. The unexplained RV variables (and thus suspected binaries), the known SB for which we lack information on the companion, the stars with an UV flux inconsistent with their classification, and the fast rotating stars for which no accurate abundance analysis can be performed, are also reviewed.
23709. Velocities of M67 main-sequence and giant stars
ID:
ivo://CDS.VizieR/J/A+A/526/A127
Title:
Velocities of M67 main-sequence and giant stars
Short Name:
J/A+A/526/A127
Date:
21 Oct 2021
Publisher:
CDS
Description:
Precise analyses of stellar radial velocities is able to reveal intrinsic causes of the wavelength shifts of spectral lines (other than Doppler shifts due to radial motion), such as gravitational redshifts and convective blueshifts. Aims. Gravitational redshifts in solar-type main-sequence stars are expected to be some 500m/s greater than those in giants. We search for this difference in redshifts among groups of open-cluster stars that share the same average space motion and thus have the same average Doppler shift.
23710. Velocities of 43 nearby L dwarfs
ID:
ivo://CDS.VizieR/J/A+A/512/A37
Title:
Velocities of 43 nearby L dwarfs
Short Name:
J/A+A/512/A37
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present radial velocity measurements of a sample of L0-L8 dwarfs observed with VLT/UVES and Keck/HIRES. We combine these measurements with distance and proper motion from the literature to determine space motions for 43 of our targets. We identify nine candidate members of young moving groups, which have ages of 50-600Myr according to their space motion.

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