Search

Start Over Subject catalogs Content Level Research
601. RC2 Catalogue
ID:
ivo://CDS.VizieR/VII/112
Title:
RC2 Catalogue
Short Name:
VII/112
Date:
21 Oct 2021
Publisher:
CDS
Description:
This standardized documentation file does not contain a complete description of the electronic version of the RC2 catalogue; please refer to the "doc.tex" file prepared by Theresa A. Nagy and Robert S. Hill.
602. RC3 corrections and additions
ID:
ivo://CDS.VizieR/J/AJ/108/2128
Title:
RC3 corrections and additions
Short Name:
J/AJ/108/2128
Date:
21 Oct 2021
Publisher:
CDS
Description:
Lists of corrections and additions to the Third Reference Catalogue of Bright Galaxies (RC3, Cat. <VII/155>) are given. The corrected version of the catalogue (RC3.9b), dated April 1994, is currently available through the national data centers.
603. Recently quenched elliptical galaxies in SDSS
ID:
ivo://CDS.VizieR/J/MNRAS/442/533
Title:
Recently quenched elliptical galaxies in SDSS
Short Name:
J/MNRAS/442/533
Date:
21 Oct 2021
Publisher:
CDS
Description:
We use the Sloan Digital Sky Survey to investigate the properties of massive elliptical galaxies in the local Universe (z<=0.08) that have unusually blue optical colours. Through careful inspection, we distinguish elliptical from non-elliptical morphologies among a large sample of similarly blue galaxies with high central light concentrations (c_r_>=2.6). These blue ellipticals comprise 3.7 per cent of all c_r>=2.6 galaxies with stellar masses between 10^10^ and 10^11^h^-2^M_{sun}_. Using published fibre spectrum diagnostics, we identify a unique subset of 172 non-star-forming ellipticals with distinctly blue urz colours and young (<3Gyr) light-weighted stellar ages. These recently quenched ellipticals (RQEs) have a number density of 2.7-4.7x10^-5^h^3^/Mpc^3^ and sufficient numbers above 2.5x10^10^h^-2^M_{sun}_ to account for more than half of the expected quiescent growth at late cosmic time assuming that this phase lasts 0.5Gyr. RQEs have properties that are consistent with a recent merger origin (i.e. they are strong 'first-generation' elliptical candidates), yet few involved a starburst strong enough to produce an E+A signature. The preferred environment of RQEs (90 per cent reside at the centres of <3x10^12^h^-1^M_{sun}_ groups) agrees well with the 'small group scale' predicted for maximally efficient spiral merging on to their halo centre and rules out satellite-specific quenching processes. The high incidence of Seyfert and LINER activity in RQEs and their plausible descendants may heat the atmospheres of small host haloes sufficiently to maintain quenching.
604. Red-sequence early-type galaxies. II.
ID:
ivo://CDS.VizieR/J/A+A/617/A53
Title:
Red-sequence early-type galaxies. II.
Short Name:
J/A+A/617/A53
Date:
21 Oct 2021
Publisher:
CDS
Description:
This work aims to observationally investigate the history of size growth of early-type galaxies and how the growth depends on cosmic epoch and the mass of the halo in which they are embedded. We carried out a photometric and structural analysis in the rest-frame V band of a mass-selected (logM/M_{sun}_>10.7) sample of red-sequence early-type galaxies with spectroscopic/grism redshift in the general field up to z=2 to complement a previous work presenting an identical analysis but in halos 100 times more massive and 1000 times denser. We homogeneously derived sizes (effective radii) fully accounting for the multi-component nature of galaxies and the common presence of isophote twists and ellipticity gradients. By using these mass-selected samples, composed of 170 red-sequence early-type galaxies in the general field and 224 identically selected and analyzed in clusters, we isolate the effect on galaxy sizes of the halo in which galaxies are embedded and its dependence on epoch. We find that the log of the galaxy size at a fixed stellar mass, log M/M_{sun}_=11, has increased with epoch at a rate twice as fast in the field than in cluster in the last 10Gyr (0.26+/-0.03 versus 0.13+/-0.02dex per unit redshift). Red-sequence early-type galaxies in the general field reached the size of their cousins in denser environment by z=0.25+/-0.13 in spite of being three times smaller at z~2. Data point toward a model where size growth is epoch-independent (i.e., {\partial}logre/{\partial}z=c), but with a rate c depending on environment, {\partial}c/{\partial}logM_halo_~=0.05. Environment determines the growth rate (dlogre/dz) at all redshifts, indicating an external origin for the galaxy growth without any clear epoch where it ceases to have an effect. The larger size of early-type galaxies in massive halos at high redshift indicates that their size grew buildup earlier (at z>2) at an accelerated rate, slowing down at some still unidentified z>2 redshift. Instead, the size growth rate of red-sequence early-type galaxies in low-mass halos is reversed: it proceeds at an increased rate at late epochs after an early period (z>2) of reduced growth, in agreement with the qualitative hierarchical picture of galaxy evolution. We found similar values of scatter around the mass-size relation independently of environment and epoch, indicating that the amount of dissipation in the system forming the observed galaxy does not vary greatly with epoch or environment.
605. Redshift catalog of galaxies in GOODS-South field
ID:
ivo://CDS.VizieR/J/AJ/149/178
Title:
Redshift catalog of galaxies in GOODS-South field
Short Name:
J/AJ/149/178
Date:
21 Oct 2021
Publisher:
CDS
Description:
We combine Hubble Space Telescope (HST)/Wide Field Camera3 (WFC3) imaging and G141 grism observations from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and 3D-HST surveys to produce a catalog of grism spectroscopic redshifts for galaxies in the CANDELS/GOODS-South field. The WFC3/G141 grism spectra cover a wavelength range of 1.1{<=}{lambda}{<=}1.7{mu}m with a resolving power of R~130 for point sources, thus providing rest-frame optical spectra for galaxies out to z~3.5. The catalog is selected in the H-band (F160W) and includes both galaxies with and without previously published spectroscopic redshifts. Grism spectra are extracted for all H-band detected galaxies with H<=24 and a CANDELS photometric redshift z_phot_>=0.6. The resulting spectra are visually inspected to identify emission lines, and redshifts are determined using cross-correlation with empirical spectral templates. To establish the accuracy of our redshifts, we compare our results against high-quality spectroscopic redshifts from the literature. Using a sample of 411 control galaxies, this analysis yields a precision of {sigma}_NMAD_=0.0028 for the grism-derived redshifts, which is consistent with the accuracy reported by the 3D-HST team. Our final catalog covers an area of 153arcmin^2^ and contains 1019 redshifts for galaxies in GOODS-S. Roughly 60% (608/1019) of these redshifts are for galaxies with no previously published spectroscopic redshift. These new redshifts span a range of 0.677{<=}z{<=}3.456 and have a median redshift of z=1.282. The catalog contains a total of 234 new redshifts for galaxies at z>1.5. In addition, we present 20 galaxy pair candidates identified for the first time using the grism redshifts in our catalog, including four new galaxy pairs at z~2, nearly doubling the number of such pairs previously identified.
606. Redshift clustering in the Hubble Deep Field
ID:
ivo://CDS.VizieR/J/ApJ/471/L5
Title:
Redshift clustering in the Hubble Deep Field
Short Name:
J/ApJ/471/L5
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present initial results from a redshift survey carried out with the low-resolution imaging spectrograph on the 10m W. M. Keck Telescope in the Hubble Deep Field. In the redshift distribution of the 140 extragalactic objects in this sample, we find six strong peaks with velocity dispersions of ~400km/s. The areal density of objects within a particular peak, while it may be nonuniform, does not show evidence for strong central concentration. These peaks have characteristics (velocity dispersions, density enhancements, spacing, and spatial extent) similar to those seen in a comparable redshift survey in a different high Galactic latitude field (Cohen and coworkers), confirming that the structures are generic. They are probably the high-redshift counterparts of huge galaxy structures ("walls") observed locally.
607. Redshift database towards Shapley Supercluster
ID:
ivo://CDS.VizieR/J/A+A/638/A27
Title:
Redshift database towards Shapley Supercluster
Short Name:
J/A+A/638/A27
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a database and velocity catalogue towards the region of the Shapley Supercluster based on 18,129 measured velocities for 10,702 galaxies in the approximately 300 square degree area between 12:42:13.219<RA<14:16:59.210 and -38:29:35.70<Dec<-23:28:34.90. The data catalogue contains velocities from the literature found until 2015. It also includes 5,084 velocities, corresponding to 4617 galaxies, observed by us at Las Campanas and CTIO observatories and not reported individually until now. Of these, 2585 correspond to galaxies with no other previously published velocity measurement before 2015. Every galaxy in the velocity database has been identified with a galaxy extracted from the SuperCOSMOS photometric catalogues. We also provide a combined average velocity catalogue for all 10702 galaxies with measured velocities, adopting the SuperCOSMOS positions as a homogeneous base. A general magnitude cut-off at R2=18.0mag was adopted (with exceptions only for some of the new reported velocities). In general terms, we confirm the overall structure of the Shapley Supercluster, as found on earlier papers. However, the more extensive velocity data show finer structure, to be discussed in a future publication.
608. Redshift estimates in the SDSS DR2
ID:
ivo://CDS.VizieR/J/AJ/130/2439
Title:
Redshift estimates in the SDSS DR2
Short Name:
J/AJ/130/2439
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have applied ClassX, an oblique decision tree classifier optimized for astronomical analysis, to the homogeneous multicolor imaging database of the Sloan Digital Sky Survey (SDSS), training the software on subsets of SDSS objects whose nature is precisely known via spectroscopy. We find that the software, using photometric data only, correctly classifies a very large fraction of the objects with existing SDSS spectra, both stellar and extragalactic. ClassX also accurately predicts the redshifts of both normal and active galaxies in SDSS. To illustrate ClassX applications in SDSS research, we (1) derive the object content of the SDSS Data Release 2 photometric catalog and (2) provide a sample catalog of resolved SDSS objects that contains a large number of candidate active galactic nucleus (AGN) galaxies (27,000), along with 63,000 candidate normal galaxies at magnitudes substantially fainter than the typical magnitudes of SDSS spectroscopic objects.
609. Redshifts behind the Southern Milky Way
ID:
ivo://CDS.VizieR/J/A+A/415/9
Title:
Redshifts behind the Southern Milky Way
Short Name:
J/A+A/415/9
Date:
21 Oct 2021
Publisher:
CDS
Description:
As part of our efforts to unveil extragalactic large-scale structures behind the southern Milky Way, we here present redshifts for 764 galaxies in the Hydra/Antlia, Crux and Great Attractor region (266{deg}<=l<=338{deg}, |b|<=10{deg}), obtained with the Meudon-ESO Fibre Object Spectrograph (MEFOS) at the 3.6-m telescope of ESO. The observations are part of a redshift survey of partially obscured galaxies recorded in the course of a deep optical galaxy search behind the southern Milky Way (Kraan-Korteweg 2000, Cat. <J/A+AS/141/123>; Woudt & Kraan-Korteweg 2001, Cat. <J/A+A/380/441>). A total of 947 galaxies have been observed, a small percentage of the spectra (N=109, 11.5%) were contaminated by foreground stars, and 74 galaxies (7.8%) were too faint to allow a reliable redshift determination. With MEFOS we obtained spectra down to the faintest galaxies of our optical galaxy survey, and hence probe large-scale structures out to larger distances (v<=30000km/s) than our other redshift follow-ups using the 1.9-m telescope at the South African Astronomical Observatory (Kraan-Korteweg et al., 1995, Cat. <J/A+A/297/617>; Fairall et al., 1998, Cat. <J/A+AS/127/463>; Woudt et al., 1999, Cat. <J/A+A/352/39>) and the 64-m Parkes radio telescope (Kraan-Korteweg et al., 2002, Cat. <J/A+A/391/887>). The most distinct large-scale structures revealed in the southern Zone of Avoidance are discussed in context to known structures adjacent to the Milky Way.
610. Redshifts in supercluster SCL 2243-0935
ID:
ivo://CDS.VizieR/J/A+A/532/A57
Title:
Redshifts in supercluster SCL 2243-0935
Short Name:
J/A+A/532/A57
Date:
21 Oct 2021
Publisher:
CDS
Description:
In archival 2.2m MPG-ESO/WFI data we discovered several mass peaks through weak gravitational lensing, forming a possible supercluster at redshift 0.45. Through wide-field imaging and spectroscopy we aim to identify the supercluster centre, confirm individual member clusters, and detect possible connecting filaments. Through multi-colour imaging with CFHT/Megaprime and INT/WFC we identify a population of early-type galaxies and use it to trace the supercluster network. EMMI/NTT multi-object spectroscopy is used to verify the initial shear-selected cluster candidates. We use weak gravitational lensing to obtain mass estimates for the supercluster centre and the filaments.

Limit your search

more »

more »

  • 2872