- ID:
- ivo://wfau.roe.ac.uk/videoDR4-dsa
- Title:
- VIDEO DR4 - VISTA Deep Extragalactic Observations survey
- Short Name:
- VIDEO DR4
- Date:
- 04 Dec 2019 13:40:50
- Publisher:
- WFAU, Institute for Astronomy, University of Edinburgh
- Description:
- The VIDEO survey is a 30 sq. degree, Z,Y,J,H,K survey that is specifically designed to enable exploration of the main issues in observational cosmology. It allows galaxy and cluster/structure evolution to be traced as a function of both epoch and environment from the present day out to z=4 and AGN/QSO evolution up to and into the epoch of reionization at z > 6. The multi-band nature of the survey ensures many key science drivers can be tackled using the survey alone, without recourse to data from other wavebands.
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- ID:
- ivo://wfau.roe.ac.uk/videoDR3-dsa
- Title:
- VIDEO DR3 - VISTA Deep Extragalactic Observations survey
- Short Name:
- VIDEO DR3
- Date:
- 04 Dec 2019 13:40:40
- Publisher:
- WFAU, Institute for Astronomy, University of Edinburgh
- Description:
- The VIDEO survey is a 30 sq. degree, Z,Y,J,H,K survey that is specifically designed to enable exploration of the main issues in observational cosmology. It allows galaxy and cluster/structure evolution to be traced as a function of both epoch and environment from the present day out to z=4 and AGN/QSO evolution up to and into the epoch of reionization at z > 6. The multi-band nature of the survey ensures many key science drivers can be tackled using the survey alone, without recourse to data from other wavebands.
- ID:
- ivo://wfau.roe.ac.uk/videoDR2-dsa
- Title:
- VIDEO DR2 - VISTA Deep Extragalactic Observations survey
- Short Name:
- VIDEO DR2
- Date:
- 04 Dec 2019 13:40:29
- Publisher:
- WFAU, Institute for Astronomy, University of Edinburgh
- Description:
- The VIDEO survey is a 30 sq. degree, Z,Y,J,H,K survey that is specifically designed to enable exploration of the main issues in observational cosmology. It allows galaxy and cluster/structure evolution to be traced as a function of both epoch and environment from the present day out to z=4 and AGN/QSO evolution up to and into the epoch of reionization at z > 6. The multi-band nature of the survey ensures many key science drivers can be tackled using the survey alone, without recourse to data from other wavebands.
- ID:
- ivo://wfau.roe.ac.uk/videoDR4-dsa/ceaApplication
- Title:
- VIDEO DR4 - VISTA Deep Extragalactic Observations survey
- Date:
- 06 May 2015 00:45:51
- Publisher:
- WFAU, Institute for Astronomy, University of Edinburgh
- Description:
- The VIDEO survey is a 30 sq. degree, Z,Y,J,H,K survey that is specifically designed to enable exploration of the main issues in observational cosmology. It allows galaxy and cluster/structure evolution to be traced as a function of both epoch and environment from the present day out to z=4 and AGN/QSO evolution up to and into the epoch of reionization at z > 6. The multi-band nature of the survey ensures many key science drivers can be tackled using the survey alone, without recourse to data from other wavebands.
- ID:
- ivo://wfau.roe.ac.uk/videoDR3-dsa/ceaApplication
- Title:
- VIDEO DR3 - VISTA Deep Extragalactic Observations survey
- Date:
- 05 Mar 2014 15:03:47
- Publisher:
- WFAU, Institute for Astronomy, University of Edinburgh
- Description:
- The VIDEO survey is a 30 sq. degree, Z,Y,J,H,K survey that is specifically designed to enable exploration of the main issues in observational cosmology. It allows galaxy and cluster/structure evolution to be traced as a function of both epoch and environment from the present day out to z=4 and AGN/QSO evolution up to and into the epoch of reionization at z > 6. The multi-band nature of the survey ensures many key science drivers can be tackled using the survey alone, without recourse to data from other wavebands.
- ID:
- ivo://wfau.roe.ac.uk/videoDR2-dsa/ceaApplication
- Title:
- VIDEO DR2 - VISTA Deep Extragalactic Observations survey
- Date:
- 17 Jul 2012 15:58:34
- Publisher:
- WFAU, Institute for Astronomy, University of Edinburgh
- Description:
- The VIDEO survey is a 30 sq. degree, Z,Y,J,H,K survey that is specifically designed to enable exploration of the main issues in observational cosmology. It allows galaxy and cluster/structure evolution to be traced as a function of both epoch and environment from the present day out to z=4 and AGN/QSO evolution up to and into the epoch of reionization at z > 6. The multi-band nature of the survey ensures many key science drivers can be tackled using the survey alone, without recourse to data from other wavebands.
- ID:
- ivo://wfau.roe.ac.uk/videoDR5-dsa/ceaApplication
- Title:
- VIDEO DR5 - VISTA Deep Extragalactic Observations survey
- Date:
- 10 Nov 2017 17:06:48
- Publisher:
- WFAU, Institute for Astronomy, University of Edinburgh
- Description:
- The VIDEO survey is a 30 sq. degree, Z,Y,J,H,K survey that is specifically designed to enable exploration of the main issues in observational cosmology. It allows galaxy and cluster/structure evolution to be traced as a function of both epoch and environment from the present day out to z=4 and AGN/QSO evolution up to and into the epoch of reionization at z > 6. The multi-band nature of the survey ensures many key science drivers can be tackled using the survey alone, without recourse to data from other wavebands.
23878. Vienna survey in Orion. III.
- ID:
- ivo://CDS.VizieR/J/A+A/622/A149
- Title:
- Vienna survey in Orion. III.
- Short Name:
- J/A+A/622/A149
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have extended and refined the existing young stellar object (YSO) catalogs for the Orion A molecular cloud, the closest massive star-forming region to Earth. This updated catalog is driven by the large spatial coverage (18.3deg^2^, ~950pc^2^), seeing limited resolution (~0.7''), and sensitivity (K_s_<19mag) of the ESO-VISTA near-infrared survey of the Orion A cloud (VISION). Combined with archival mid- to far-infrared data, the VISTA data allow for a refined and more robust source selection. We estimate that among previously known protostars and pre-main-sequence stars with disks, source contamination levels (false positives) are at least ~6.4% and ~2.3%, respectively, mostly due to background galaxies and nebulosities. We identify 274 new YSO candidates using VISTA/Spitzer based selections within previously analyzed regions, and VISTA/WISE based selections to add sources in the surroundings, beyond previously analyzed regions. The WISE selection method recovers about 59% of the known YSOs in Orion A's low-mass star-forming part L1641, which shows what can be achieved by the all-sky WISE survey in combination with deep near-infrared data in regions without the influence of massive stars. The new catalog contains 2980 YSOs, which were classified based on the de-reddened mid-infrared spectral index into 188 protostars, 185 flat-spectrum sources, and 2607 pre-main-sequence stars with circumstellar disks. We find a statistically significant difference in the spatial distribution of the three evolutionary classes with respect to regions of high dust column-density, confirming that flat-spectrum sources are at a younger evolutionary phase compared to Class IIs, and are not a sub-sample seen at particular viewing angles.
- 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.
- 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.
