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771. Triplets of galaxies in the SDSS-DR7
ID:
ivo://CDS.VizieR/J/MNRAS/421/1897
Title:
Triplets of galaxies in the SDSS-DR7
Short Name:
J/MNRAS/421/1897
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a new catalogue of galaxy triplets derived from the Sloan Digital Sky Survey (SDSS) Data Release 7. The identification of systems was performed considering galaxies brighter than M_r_=-20.5 and imposing constraints over the projected distances, radial velocity differences of neighbouring galaxies and isolation. To improve the identification of triplets, we employed a data pixelization scheme, which allows us to handle large amounts of data as in the SDSS photometric survey. Using spectroscopic and photometric data in the redshift range 0.01<=z<=0.40, we obtain 5901 triplet candidates. We have used a mock catalogue to analyse the completeness and contamination of our methods.
772. Tully-Fisher relation for SDSS galaxies
ID:
ivo://CDS.VizieR/J/MNRAS/417/2347
Title:
Tully-Fisher relation for SDSS galaxies
Short Name:
J/MNRAS/417/2347
Date:
21 Oct 2021
Publisher:
CDS
Description:
In this paper, we derive scaling relations between photometric observable quantities and disc galaxy rotation velocity V_rot_ or Tully-Fisher relations (TFRs). Our methodology is dictated by our purpose of obtaining purely photometric, minimal-scatter estimators of V_rot_ applicable to large galaxy samples from imaging surveys. To achieve this goal, we have constructed a sample of 189 disc galaxies at redshifts z<0.1 with long-slit H{alpha} spectroscopy from Pizagno et al. (2007, Cat. J/AJ/134/945) and new observations. By construction, this sample is a fair subsample of a large, well-defined parent disc sample of ~170000 galaxies selected from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7).
773. Tully-Fisher relation in MAGIC groups
ID:
ivo://CDS.VizieR/J/A+A/647/A152
Title:
Tully-Fisher relation in MAGIC groups
Short Name:
J/A+A/647/A152
Date:
21 Oct 2021
Publisher:
CDS
Description:
Galaxies in dense environments are subject to interactions and mechanisms that directly affect their evolution by lowering their gas fractions and consequently reducing their star-forming capacity earlier than their isolated counterparts. The aim of our project is to get new insights into the role of environment in the stellar and baryonic content of galaxies using a kinematic approach, through the study of the Tully-Fisher relation (TFR). We study a sample of galaxies in eight groups, over-dense by a factor larger than 25 with respect to the average projected density, spanning a redshift range of 0.5<z<0.8 and located in ten pointings of the MAGIC MUSE Guaranteed Time Observations program. We perform a morpho-kinematics analysis of this sample and set up a selection based on galaxy size, [OII]{lambda}{lambda}3727,3729 emission line doublet signal-to-noise ratio, bulge-to-disk ratio, and nuclear activity to construct a robust kinematic sample of 67 star-forming galaxies. We show that this selection considerably reduces the number of outliers in the TFR, which are predominantly dispersion-dominated galaxies. Similar to other studies, we find that including the velocity dispersion in the velocity budget mainly affects galaxies with low rotation velocities, reduces the scatter in the relation, increases its slope, and decreases its zero-point. Including gas masses is more significant for low-mass galaxies due to a larger gas fraction, and thus decreases the slope and increases the zero-point of the relation. Our results suggest a significant offset of the TFR zero-point between galaxies in low- and high-density environments, regardless of the kinematics estimator used. This can be interpreted as a decrease in either stellar mass by ~0.05-0.3dex or an increase in rotation velocity by ~0.02-0.06dex for galaxies in groups, depending on the samples used for comparison. We also studied the stellar and baryon mass fractions within stellar disks and found they both increase with stellar mass, the trend being more pronounced for the stellar component alone. These fractions do not exceed 50%. We show that this evolution of the TFR is consistent either with a decrease in star formation or with a contraction of the mass distribution due to the environment. These two effects probably act together, with their relative contribution depending on the mass regime.
774. Turin-SyCAT, Seyferts multifrequency catalog
ID:
ivo://CDS.VizieR/J/A+A/659/A32
Title:
Turin-SyCAT, Seyferts multifrequency catalog
Short Name:
J/A+A/659/A32
Date:
02 Mar 2022 06:48:51
Publisher:
CDS
Description:
We present the first release of Turin-SyCAT, a multifrequency catalog of Seyfert galaxies. We selected Seyfert galaxies considering criteria based on radio, infrared, and optical properties and starting from sources belonging to hard X-ray catalogs and surveys. We visually inspected optical spectra available for all selected sources. We adopted homogeneous and stringent criteria in the source selection aiming at reducing the possible contamination from other source classes. Our final catalog includes 351 Seyfert galaxies distinguished in 233 type 1 and 118 type 2. Type 1 Seyfert galaxies appear to have mid-IR colors similar to blazars, but are distinguished from them by their radio-loudness. Additionally, Seyfert 2 galaxies have mid-IR colors more similar to quasars than BL Lac objects. As expected from their spectral properties, type 1 and 2 Seyfert galaxies show a clear distinction when using the u-r color. Finally, we found a tight correlation between the mid-IR fluxes at both 12 and 22 um (i.e., F12 and F22, respectively) and hard X-ray fluxes between 15 and 150 keV. Both Seyfert types appear to follow the same trend and share similar values of the ratios of F12 and F22 to FHX in agreement with expectations of the AGN unification scenario. As future perspectives, the Turin-SyCAT will then be used to search for heavily obscured Seyfert galaxies among unidentified hard X-ray sources, given the correlation between mid-IR and hard X-rays, and to investigate their large-scale environments.
775. UBVRI photometry of FKSZ stars
ID:
ivo://CDS.VizieR/J/A+AS/100/489
Title:
UBVRI photometry of FKSZ stars
Short Name:
J/A+AS/100/489
Date:
21 Oct 2021
Publisher:
CDS
Description:
UBVRI photometry in the Kron-Cousins system was observed for 117 stars of the Catalogue of Fundamental Faint Stars (FKSZ stars) in the declination zone 0 to +18{deg}. The observations were made in 24 nights from July 1988 to March 1989 with the European Southern Observatory (ESO) 0.50m telescope at La Silla, Chile.
776. UBVRI Standard Stars
ID:
ivo://CDS.VizieR/J/AJ/133/2502
Title:
UBVRI Standard Stars
Short Name:
J/AJ/133/2502
Date:
21 Oct 2021
Publisher:
CDS
Description:
UBVRI photoelectric observations have been made of 109 stars around the sky, centered more or less at -50{deg} declination. The majority of the stars fall in the magnitude range 10.4<V<15.5 and in the color index range -0.33<(B-V)<+1.66. These new broadband photometric standard stars average 16.4 measurements each from data taken on 116 different nights over a period of 4yr. Similar data are tabulated for 19 stars of interest that were not observed often enough to make them well-defined standard stars.
777. Uccle AC Zone Data Reduced to ACRS
ID:
ivo://CDS.VizieR/I/231
Title:
Uccle AC Zone Data Reduced to ACRS
Short Name:
I/231
Date:
21 Oct 2021
Publisher:
CDS
Description:
The U.S. Naval Observatory is in the process of making new reductions of the Astrographic Catalogue (AC) using a modern reference system, the ACRS, which represents the system of the FK5. The data from the Uccle Zone, whose plates are centered between declinations +34 and +35 degrees (eq. 1900), have been analyzed for scale, rotation, tilt, coma, magnitude equation, radial distortion and distortions introduced by the use of reseaux in the Carte du Ciel program. The result is a positional catalog of over 117,000 stars on eq. J2000.0, epoch of observation. Additionally, all stars have been matched with the Tycho Input Catalog (revised); those numbers have been added for additional identification purposes.
778. UDS/COSMOS HiZELS galaxies
ID:
ivo://CDS.VizieR/J/MNRAS/428/1128
Title:
UDS/COSMOS HiZELS galaxies
Short Name:
J/MNRAS/428/1128
Date:
21 Oct 2021
Publisher:
CDS
Description:
This paper presents new deep and wide narrow-band surveys undertaken with United Kingdom Infrared Telescope (UKIRT), Subaru and the Very Large Telescope (VLT), a unique combined effort to select large, robust samples of H{alpha} star-forming galaxies at z = 0.40, 0.84, 1.47 and 2.23 (corresponding to look-back times of 4.2, 7.0, 9.2 and 10.6Gyr) in a uniform manner over ~2deg^2^ in the Cosmological Evolution Survey and Ultra Deep Survey fields. The deep multi-epoch H{alpha} surveys reach a matched 3{sigma} flux limit of ~3M_{sun}_/yr out to z=2.2 for the first time, while the wide area and the coverage over two independent fields allow us to greatly overcome cosmic variance and assemble by far the largest samples of H{alpha} emitters. Catalogues are presented for a total of 1742, 637, 515 and 807 H{alpha} emitters, robustly selected at z = 0.40, 0.84, 1.47 and 2.23, respectively, and used to determine the H{alpha} luminosity function and its evolution.
779. UGR photometry of LBG candidates at z~3
ID:
ivo://CDS.VizieR/J/A+A/563/A142
Title:
UGR photometry of LBG candidates at z~3
Short Name:
J/A+A/563/A142
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a deep multi wavelength imaging survey (UGR) in 3 different fields, Q0933, Q1623 and COSMOS, for a total area of ~1500arcmin^2^ The data were obtained with the Large Binocular Camera on the Large Binocular Telescope. To select our LBG candidates we adopt the well established and widely used color selection criterion (U-G vs. G-R). One of the main advantages of our survey is that it has a wider dynamic color range for U drop-out selection compared to previous studies. This allows us to fully exploit the depth of our R band images, obtaining a robust sample with few interlopers. In addition, for 2 of our fields we have spectroscopic redshift information that is necessary to better estimate the completeness of our sample and interloper fraction. Our limiting magnitudes reach 27.0(AB) in the R band (5{sigma}) and 28.6(AB) in the U band (1{sigma}). This dataset was used to derive Lyman Break Galaxy candidates at z~3. We obtained a catalog with a total of 12264 sources down to the 50% completeness magnitude limit in the R band for each field. We find a surface density of ~3 LBG candidates arcmin^-2^ down to R=25.5, where completeness is >=95% for all 3 fields. This number is higher than the original studies, but consistent with more recent samples.
780. UKIDSS UDS field spectroscopic redshifts
ID:
ivo://CDS.VizieR/J/MNRAS/475/4148
Title:
UKIDSS UDS field spectroscopic redshifts
Short Name:
J/MNRAS/475/4148
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a large-scale galaxy structure Cl J021734-0513 at z~0.65 discovered in the UKIDSS UDS field, made of ~20 galaxy groups and clusters, spreading over 10Mpc. We report on a VLT/VIMOS spectroscopic follow-up program that, combined with past spectroscopy, allowed us to confirm four galaxy clusters (M_200_~10^14^M_{sun}_) and a dozen associated groups and star-forming galaxy overdensities. Two additional filamentary structures at z~0.62 and 0.69 and foreground and background clusters at 0.6<z<0.7 were also confirmed along the line of sight. The structure subcomponents are at different formation stages. The clusters have a core dominated by passive galaxies and an established red sequence. The remaining structures are a mix of star-forming galaxy overdensities and forming groups. The presence of quiescent galaxies in the core of the latter shows that 'pre-processing' has already happened before the groups fall into their more massive neighbours. Our spectroscopy allows us to derive spectral index measurements e.g. emission/absorption line equivalent widths, strength of the 4000{AA} break, valuable to investigate the star formation history of structure members. Based on these line measurements, we select a population of 'post-starburst' galaxies. These galaxies are preferentially found within the virial radius of clusters, supporting a scenario in which their recent quenching could be prompted by gas stripping by the dense intracluster medium. We derive stellar age estimates using Markov Chain Monte Carlo-based spectral fitting for quiescent galaxies and find a correlation between ages and colours/stellar masses which favours a top-down formation scenario of the red sequence. A catalogue of ~650 redshifts in UDS is released alongside the paper (via MNRAS online data).