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16881. Viewing angle in AGN SED models
ID:
ivo://CDS.VizieR/J/MNRAS/510/687
Title:
Viewing angle in AGN SED models
Short Name:
J/MNRAS/510/687
Date:
12 Jan 2022 06:30:54
Publisher:
CDS
Description:
The validity of the unified active galactic nuclei (AGN) model has been challenged in the last decade, especially when different types of AGNs are considered to only differ in the viewing angle to the torus. We aim to assess the importance of the viewing angle in classifying different types of Seyfert galaxies in spectral energy distribution (SED) modelling. We retrieve photometric data from publicly available astronomical databases: CDS and NED, to model SEDs with X-CIGALE in a sample of 13173 Seyfert galaxies located at redshift range from z=0 to z=3.5, with a median redshift of z=~0.2. We assess whether the estimated viewing angle from the SED models reflects different Seyfert classifications. Two AGN models with either a smooth or clumpy torus structure are adopted in this paper. We find that the viewing angle in Type-1 AGNs is better constrained than in Type-2 AGNs. Limiting the viewing angles representing these two types of AGNs do not affect the physical parameter estimates such as star-formation rate (SFR) or AGN fractional contribution (fAGN). In addition, the viewing angle is not the most discriminating physical parameter to differentiate Seyfert types. We suggest that the observed and intrinsic AGN disc luminosity can: i) be used in z<0.5 studies to distinguish between Type-1 and Type-2 AGNs, and ii) explain the probable evolutionary path between these AGN types. Finally, we propose the use of X-CIGALE for AGN galaxy classification tasks. All data from the 13173 SED fits are available at Zenodo.
16882. VI HST photometry of VV124 = UGC4879
ID:
ivo://CDS.VizieR/J/A+A/533/A37
Title:
VI HST photometry of VV124 = UGC4879
Short Name:
J/A+A/533/A37
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present deep V and I photometry of the isolated dwarf galaxy VV124=UGC4879, obtained from archival images taken with the Hubble Space Telescope - Advanced Camera for Surveys. In the color-magnitude diagrams of stars at distances larger than 40" from the center of the galaxy, we clearly identify for the first time a well-populated old Horizontal Branch (HB). We show that the distribution of these stars is more extended than that of Red Clump stars. This implies that very old and metal poor populations becomes more and more dominant in the outskirts of VV124. We also identify a massive (M=1.2+/-0.2x10^4^M_{sun}_) young (age=250+/-50Myr) star cluster (C1), as well as another of younger age (C2<~30+/-10Myr) with a mass similar to classical open clusters (M<=3.3+/-0.5x10^3^M_{sun}_). Both clusters lie at projected distances smaller than 100pc from the center of the galaxy.
16883. VIJK photometry of Whiting 1 stars
ID:
ivo://CDS.VizieR/J/MNRAS/446/730
Title:
VIJK photometry of Whiting 1 stars
Short Name:
J/MNRAS/446/730
Date:
21 Oct 2021
Publisher:
CDS
Description:
Whiting 1 is a member of the fast-growing group of young globular clusters in the Milky Way halo. Preliminary estimates of its fundamental parameters have been provided using optical photometry and low-resolution spectroscopy. In an attempt to strengthen our knowledge of Whiting 1, in this study we employ a complementary approach. Isochrone fitting method was applied on the near-infrared colour-magnitude diagram and yields an age t=5.7+/-0.3Gyr, metallicity z=0.006+/-0.001 ([Fe/H]=-0.5+/-0.1) and distance modulus (m-M)0=17.48+/-0.10. Our results confirm that Whiting 1 is a young and moderately metal-rich globular cluster. It is one of the youngest from the Sgr dSph. We fitted an Elson, Fall and Freeman (EFF) profile to the near-infrared number counts, and measured cluster core radius r_c_=9.1+/-3.9". Two probable eclipsing variables in the cluster were found from multi-epoch V-band photometry. Finally, an unknown galaxy cluster was identified on our K versus (J-K) colour-magnitude diagram. It has a redshift z~1, and it is located at about 1arcmin from the centre of Whiting 1 at {alpha}_J2000_= 02:02:56.6, {delta}_J2000_=-03:16:09, contaminating the cluster photometry.
16884. VIKING catalogue data release 1
ID:
ivo://CDS.VizieR/II/329
Title:
VIKING catalogue data release 1
Short Name:
II/329
Date:
21 Oct 2021
Publisher:
CDS
Description:
The VIKING survey with VISTA (ESO programme ID 179.A-2004) is a wide area (eventually 1500 sq.degrees), intermediate-depth (5-sigma detection limit J=21 on Vega system) near-infrared imaging survey, in the five broadband filters Z, Y, J, H, Ks. The planned sky coverage is at high galactic latitudes, and includes two main stripes 70x10{deg}^2^ each: one in the South Galactic cap near Dec~-30{deg}, and one near Dec~0{deg} in the North galactic cap; in addition, there are two smaller outrigger patches called GAMA09 and CFHLS-W1. Science goals include z>6.5 quasars, extreme brown dwarfs, and multiwavelength coverage and identifications for a range of other imaging surveys, notably VST-KIDS and Herschel-ATLAS. This first public data release of data taken between the 12th of November 2009 and the 13th of February 2011 includes 151 tiles with complete coverage in all five VIKING filters (55 in GAMA09/12/14, 91 in SGP and 5 in CFHLS-W1) i.e. 226 square degrees, and includes approximately 14,773,385 total sources (including low-reliability single-band detections) and the imaging and source lists total 314.4GB. The coverage in each of the five sub-areas is not completely contiguous but any inter-tile gaps are relatively small. More details can be found in the accompanying documentation: viking_cat_dr1.pdf
16885. VIKING catalogue data release 2
ID:
ivo://CDS.VizieR/II/343
Title:
VIKING catalogue data release 2
Short Name:
II/343
Date:
21 Oct 2021
Publisher:
CDS
Description:
The VIKING survey with VISTA (ESO programme ID 179.A-2004) is a wide area (eventually 1500 sq.degrees), intermediate-depth (5-sigma detection limit J=21 on Vega system) near-infrared imaging survey, in the five broadband filters Z, Y, J, H, Ks. The planned sky coverage is at high galactic latitudes, and includes two main stripes 70x10{deg}^2^ each: one in the South Galactic cap near Dec~-30{deg}, and one near Dec~0{deg} in the North galactic cap; in addition, there are two smaller outrigger patches called GAMA09 and CFHLS-W1. Science goals include z>6.5 quasars, extreme brown dwarfs, and multiwavelength coverage and identifications for a range of other imaging surveys, notably VST-KIDS and Herschel-ATLAS. This second public data release of VIKING data covers all of the highest quality data taken between the start of the survey (12th of November 2009) and the end of Period 92 (30th September 2013). This release supersedes the first release (VIKING and VIKING CAT published 28.06.2013 and 16.12.2013 respectively) as it includes improved CASU processing (V1.3) that gives better tile grouting and zero point corrections This release contains 396 tiles with coverage in all five VIKING filters, 379 of which have a deep co-add in J, and an additional 81 with at least two filters where the second OB has not been executed yet or one filter in an OB was poor quality. These 477 fields cover a total of ~690 square degrees and the resulting catalogues include a total of 46,270,162 sources (including low-reliability single-band detections). The imaging and catalogues (both single-band and band-merged) total 839.3GB. The coverage in each of the five sub-areas is not completely contiguous but any inter-tile gaps are relatively small. More details can be found in the accompanying documentation: viking_cat_dr2.pdf
16886. VIKING - VISTA Kilo-degree Infrared Galaxy survey Data Release 4
ID:
ivo://wfau.roe.ac.uk/vikingDR4-dsa
Title:
VIKING - VISTA Kilo-degree Infrared Galaxy survey Data Release 4
Short Name:
VIKING DR4
Date:
04 Dec 2019 13:41:34
Publisher:
WFAU, Institute for Astronomy, University of Edinburgh
Description:
The VIKING survey is the VISTA counterpart to the VST KIDS survey. The KIDS survey will cover 1500 deg^2 in u,g,r,i divided in two stripes (NGP, centred on equator ; SGP, centred on Dec = -30). The matching VISTA survey will cover (almost) all of these stripes in Z,Y,J,H, Ks with ~ 400s exposures per band.
16887. VIKING - VISTA Kilo-degree Infrared Galaxy survey Data Release 3
ID:
ivo://wfau.roe.ac.uk/vikingDR3-dsa
Title:
VIKING - VISTA Kilo-degree Infrared Galaxy survey Data Release 3
Short Name:
VIKING DR3
Date:
04 Dec 2019 13:41:21
Publisher:
WFAU, Institute for Astronomy, University of Edinburgh
Description:
The VIKING survey is the VISTA counterpart to the VST KIDS survey. The KIDS survey will cover 1500 deg^2 in u,g,r,i divided in two stripes (NGP, centred on equator ; SGP, centred on Dec = -30). The matching VISTA survey will cover (almost) all of these stripes in Z,Y,J,H, Ks with ~ 400s exposures per band.
16888. VIKING - VISTA Kilo-degree Infrared Galaxy survey Data Release 2
ID:
ivo://wfau.roe.ac.uk/vikingDR2-dsa
Title:
VIKING - VISTA Kilo-degree Infrared Galaxy survey Data Release 2
Short Name:
VIKING DR2
Date:
04 Dec 2019 13:41:10
Publisher:
WFAU, Institute for Astronomy, University of Edinburgh
Description:
The VIKING survey is the VISTA counterpart to the VST KIDS survey. The KIDS survey will cover 1500 deg^2 in u,g,r,i divided in two stripes (NGP, centred on equator ; SGP, centred on Dec = -30). The matching VISTA survey will cover (almost) all of these stripes in Z,Y,J,H, Ks with ~ 400s exposures per band.
16889. VIK' photometry and redshifts of galaxy clusters
ID:
ivo://CDS.VizieR/J/ApJ/563/629
Title:
VIK' photometry and redshifts of galaxy clusters
Short Name:
J/ApJ/563/629
Date:
21 Oct 2021
Publisher:
CDS
Description:
We analyze photometry and spectroscopy of a sample of 63 clusters at 0.3<=z<=0.9 drawn from the Las Campanas Distant Cluster Survey to empirically constrain models of cluster galaxy evolution. Our data originate from a variety of telescopes and instruments. The candidate galaxy clusters are identified using drift-scan images and techniques described briefly below for context but in full detail by Gonzalez et al. (2001, Cat. <J/ApJS/137/117>).
16890. VIK' photometry and redshifts of galaxy clusters
ID:
ivo://CDS.VizieR/J/ApJ/566/103
Title:
VIK' photometry and redshifts of galaxy clusters
Short Name:
J/ApJ/566/103
Date:
21 Oct 2021
Publisher:
CDS
Description:
We investigate the influence of environment on brightest cluster galaxy (BCG) evolution using a sample of 63 clusters at 0.3<=z<=0.9 drawn primarily from the Las Campanas Distant Cluster Survey and follow-up V, I, and K' photometry. Our data originate from a variety of telescopes and instruments. The cluster sample and observations used here stem from deep optical and infrared follow-up imaging of a small subset of the full catalog that was obtained to aid in the classification of candidates and to develop photometric redshift indicators.

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