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22301. Tomography with Magnification Bias
ID:
ivo://CDS.VizieR/J/A+A/656/A99
Title:
Tomography with Magnification Bias
Short Name:
J/A+A/656/A99
Date:
21 Mar 2022 07:10:35
Publisher:
CDS
Description:
High-z submillimetre galaxies can be used as a background sample for gravitational lensing studies thanks to their magnification bias. In particular, the magnification bias can be exploited in order to constrain the free parameters of a halo occupation distribution (HOD) model and some of the main cosmological parameters. A pseudo-tomographic analysis shows that the tomographic approach should improve the parameter estimation. In this work the magnification bias has been evaluated as cosmological tool in a tomographic set up. The cross-correlation function (CCF) data have been used to jointly constrain the astrophysical parameters M_min_, M_1_ and {alpha} in each one of the selected redshift bins, as well as the cosmological parameter {Omega}_M_, {sigma}_8_ and H_0_ for the lambda cold dark matter ({Lambda}CMD). Moreover, we explore the possible time evolution of the dark energy density introducing the {omaga}_0_ and {omage}_a_ parameters in the joint analysis ({omega}_0_CDM and {omega}_0_{omega}_a_CDM). The CCF was measured between a foreground spectroscopic sample of Galaxy And Mass Assembly galaxies and a background sample of Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) galaxies. The foreground sample was divided into four redshift bins (0.1-0.2, 0.2-0.3, 0.3-0.5, and 0.5-0.8) and the sample of H-ATLAS galaxies has photometric redshifts >1.2. The CCF was modelled using a halo model description that depends on HOD and cosmological parameters. Then a Markov chain Monte Carlo method was used to estimate the parameters for different cases. For the {Lambda}CDM model the analysis yields a maximum posterior value at 0.26 with [0.17, 0.41] 68% C.I. for {Omega}_M_ and at 0.87 with [0.75, 1] 68% C.I. for {sigma}_8_. With our current results H_0_ is not yet constrained. With a more general {omega}_0_CDM model, the constraints on {Omega}_M_ and {sigma}_8_ are similar, but we found a maximum posterior value for {omega}_0_ at -1 with [-1.56, -0.47] 68% C.I. In the {omega}_0_{omega}_a_CDM model, the results are -1.09 with [-1.72, -0.66] 68% C.I. for {omega}_0_ and -0.19 with [-1.88, 1.48] 68% C.I. for {omega}_a_. The results on Mmin show a trend towards higher values at higher redshift confirming recent findings. The tomographic analysis presented in this work improves the constraints in the {sigma}_8_-{Omega}_M_ plane with respect to previous findings exploiting the magnification bias and it confirms that magnification bias results do not show the degeneracy found with cosmic shear measurements. Moreover, related to dark energy, we found a trend of higher {omega}_0_ values for lower H_0_ values.
22302. Tonantzintla Pleiades Flare Stars
ID:
ivo://CDS.VizieR/II/131
Title:
Tonantzintla Pleiades Flare Stars
Short Name:
II/131
Date:
21 Oct 2021
Publisher:
CDS
Description:
The original catalog lists the flare stars discovered by different astronomical observatories over an area slightly larger than 20 square degrees in the Pleiades regions centered on Alcyone. Not all the flare stars are members of this cluster, membership indicators are provided in the catalog. The catalog, combining Tables 1 and 2 of the publication, gives the data for 1531 flares of 519 flare stars.
22303. TOPCAT and Aladin working together
ID:
ivo://edu.gavo.org/hd/topcat_aladin_together
Title:
TOPCAT and Aladin working together
Date:
27 Dec 2024 08:31:05
Publisher:
The GAVO DC team
Description:
This tutorial will show how tabular data can be easily transferred from Topcat to Aladin or the other way, and it will illustrate the benefits of this inter-client communication for VO users. This is shown with a quick look at filtering members of the Coma Cluster from SDSS.
22304. TOPCAT/STILTS Advanced Tutorial
ID:
ivo://edu.euro-vo.org/extern/asterics_topcatadvanced
Title:
TOPCAT/STILTS Advanced Tutorial
Date:
27 Dec 2024 08:31:03
Publisher:
The GAVO DC team
Description:
This tutorial is a dense course through the advanced functions of TOPCAT and STILTS. It covers detailed information of how to use TOPCAT and STILTS to find data in the VO, access them, perform crossmatches and how to do visualisations.
22305. TOPGot sample, SEDs and CH3CN analysis
ID:
ivo://CDS.VizieR/J/A+A/653/A87
Title:
TOPGot sample, SEDs and CH3CN analysis
Short Name:
J/A+A/653/A87
Date:
22 Feb 2022
Publisher:
CDS
Description:
The TOPGot project targets a sample of 86 high-mass star-forming regions in different evolutionary stages from starless cores to ultra compact HII regions. The aim of the survey is to analyze different molecular species in a statistically significant sample to study the chemical evolution in high-mass star-forming regions, and identify chemical tracers of the different phases. In the first paper we present the sample and analyze the spectral energy distributions (SEDs) of the TOPGot sources to derive physical parameters. We also use the MADCUBA software to analyze the emission of methyl cyanide (CH_3_CN), a well-known tracer of high-mass star formation. The emission of the CH_3_CN(5K-4K) K-transitions has been detected towards 73 sources (85% of the sample). The emission of CH_3_CN has been detected towards all evolutionary stages, with the mean abundances showing a clear increase of an order of magnitude from high-mass starless-cores to later evolutionary stages. We found a conservative abundance upper limit for high-mass starless cores of X_CH_3_CN_<4.0x10^-11^, and a range in abundance of 4.0x10^-11^<X_CH_3_CN_<7.0x10^-11^ for those sources that are likely high-mass starless cores or very early high-mass protostellar objects. In fact, in this range of abundance we have identified five sources previously not classified as being in a very early evolutionary stage. The abundance of CH_3_CN can thus be used to identify high-mass star-forming regions in early phases of star-formation.
22306. Topocentric positions of Pluto
ID:
ivo://CDS.VizieR/VI/155
Title:
Topocentric positions of Pluto
Short Name:
VI/155
Date:
22 Feb 2022
Publisher:
CDS
Description:
Catalog of 90 astrometric positions of Pluto have been compiled with Tycho-2 as a reference frame from photographic observations obtained at the Main Astronomical Observatory, National Academy of Sciences of Ukraine, Astronomical Observatory of the Kyiv Shevchenko National University, Research Institute Mykolaiv Astronomical Observatory and Baldone Observatory of the University of Latvia in 1961-1996. Astronegatives have been digitized with Epson Perfection V750 Pro and Epson Expression 10000XL commercial scanners in 16-bit grayscale with a resolution of 1200 dpi. (O-C) residuals obtained from the comparison with JPL PLU055/DE433 ephemeris are 0.09 ... 0.14 arcsec. Gallery of plate images used for catalog: http://gua.db.ukr-vo.org/catalog_gallery.php?catn=pluton_1961_1996
22307. Topocentric positions of Saturn's moons
ID:
ivo://CDS.VizieR/J/other/KFNT/33.70
Title:
Topocentric positions of Saturn's moons
Short Name:
J/other/KFNT/33.
Date:
21 Oct 2021
Publisher:
CDS
Description:
A catalog of 1399 astrometric positions of Saturn's moons S2-S9 has been compiled with Tycho-2 as a reference frame from photographic observations obtained at the Main Astronomical Observatory, National Academy of Sciences of Ukraine, in 1961-1990. Astronegatives have been digitized with an Epson Expression 10000XL commercial scanner in 16-bit grayscale with a resolution of 1200 dpi. Reduction has been performed in the LINUX-MIDAS-ROMAFOT software supplemented with additional modules. The internal positional accuracy of the reduction is 0.09...0.23" for both coordinates and 0.27...0.37m for the photographic magnitudes of the Tycho-2 catalog. Gallery of plate images used for the catalog: http://gua.db.ukr-vo.org/catalog_gallery.php?catn=satmoons_1961_1990
22308. Tori in AGNs through Spitzer/IRS spectra
ID:
ivo://CDS.VizieR/J/ApJ/841/37
Title:
Tori in AGNs through Spitzer/IRS spectra
Short Name:
J/ApJ/841/37
Date:
21 Oct 2021
Publisher:
CDS
Description:
Several authors have claimed that less luminous active galactic nuclei (AGNs) are not capable of sustaining a dusty torus structure. Thus, a gradual resizing of the torus is expected when the AGN luminosity decreases. Our aim is to examine mid-infrared observations of local AGNs of different luminosities for the gradual resizing and disappearance of the torus. We applied the decomposition method described by Hernan-Caballero+ (2015, J/ApJ/803/109) to a sample of ~100 Spitzer/IRS spectra of low-luminosity AGNs and powerful Seyferts in order to decontaminate the torus component from other contributors. We have also included Starburst objects to ensure secure decomposition of the Spitzer/IRS spectra. We have used the affinity propagation (AP) method to cluster the data into five groups within the sample according to torus contribution to the 5-15{mu}m range (C_torus_) and bolometric luminosity (L_bol_).
22309. Torun catalog of post-AGB and related objects
ID:
ivo://CDS.VizieR/J/A+A/469/799
Title:
Torun catalog of post-AGB and related objects
Short Name:
J/A+A/469/799
Date:
21 Oct 2021
Publisher:
CDS
Description:
With the ongoing AKARI infrared sky survey, of much greater sensitivity than IRAS, a wealth of post-AGB objects may be discovered. It is thus time to organize our present knowledge of known post-AGB stars in the galaxy with a view to using it to search for new post-AGB objects among AKARI sources. We searched the literature available on the NASA Astrophysics Data System up to 1 October 2006, and defined criteria for classifying sources into three categories: very likely, possible and disqualified post-AGB objects. The category of very likely post-AGB objects is made up of several classes. We have created an evolutionary, on-line catalogue of Galactic post-AGB objects, to be referred to as the Torun catalogue of Galactic post-AGB and related objects. The present version of the catalogue contains 326 very likely, 107 possible and 64 disqualified objects. For the very likely post-AGB objects, the catalogue gives the available optical and infrared photometry, infrared spectroscopy and spectral types, and links to finding charts and bibliography.
22310. Torun methanol source catalogue
ID:
ivo://CDS.VizieR/J/AN/333/634
Title:
Torun methanol source catalogue
Short Name:
J/AN/333/634
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the observations of 289 methanol maser sources at 6.7GHz obtained over a two month period with the Torun 32m telescope. The data form a catalogue of all objects north of {delta}=22{deg} brighter than 7.5Jy in the peak emission. The positions of sub-arcsecond accuracy are updated for 76% of the objects. We find that about one third of the sources show changes in the peak fluxes by a factor of two or more on time scales of 8.5-9.5 years.

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