Análisis exhaustivo de eyecciones de plasma solarMigraciones galácticas: ¿cómo se pueblan los cúmulos?Esperando el primer contacto

Comprehensive analysis of solar plasma ejections

Researchers from the Institute of Theoretical and Experimental Astronomy (IATE), together with an international team, published an article in which, based on observations, the deviations of solar material ejections are studied.

Galactic migrations: How are clusters populated?

José Benavides, a doctoral fellow at the Institute for Theoretical and Experimental Astronomy (IATE), Mario Abadi, a researcher at the same institute, and Laura Sales, from the University of California, published an article in which they analyze, based on computer simulations, how the galaxies arrive to clusters and what their interactions are like once they are inside.

Waiting for the first contact

Marcelo Lares, researcher at IATE (CONICET - UNC), in collaboration with José Funes (CONICET - Universidad Católica de Córdoba) and Luciana Gramajo (CONICET - Observatorio Astronómico de Córdoba), developed and simulated a model that allows analyzing the probability of contacts between civilizations that are in different points of our galaxy.

Catalogs

SDSS DR12 Galaxy Group Catalogues

Rodriguez & Merchan+20
Two catalogues of groups identified in the SDSS DR12 and their respective galaxy catalogues are presented. To construct these catalogues, groups were defined as gravitationally bounded galaxies systems with at least one bright galaxy (with an absolute magnitude <-19.5 in the r band). In the FOF_mod catalogues the data that corresponds to the FOF (Friend-of-Friends) identification is presented. It takes into account the aforementioned group definition. In the FINAL catalogues there are groups of galaxies resulting from the complete process: combining the FOF method with a halo-based algorithm. Both group catalogues contain group information which was obtained dynamically and by performing a method of abundance matching in luminosity. Details about these calculations are presented in the corresponding publication.

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Seyfert Galaxy Catalog

Schmidt+18
Optical spectra of 28 narrow line Seyfert 1 (NLS1) galaxies covering the spectral range from 4300Å to 5200Å and spectra of 6 NLS1 galaxies in the spectral range 5800Å-6800Å. Data were taken using the CASLEO 2.15m. telescope and using the 600-line/mm grating giving a resolution of 170km/s and 190km/s FWHM around Hα and Hβ, respectively.

Compact groups in SDSS DR12

Díaz-Giménez+18
A catalogue of compact groups identified on the SDSS DR12 is provided. Compact Groups were identified in redshift space with a modified Hickson-like algorithm. The catalogue comprises 462 compact groups of which 406 clearly fulfil all the compact group requirements: compactness, isolation and velocity concordance of all of their members. The remaining 56 groups need further redshift information of potentially contaminating sources.

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Objetos Extensos en el Relevamiento VVV (VISTA Variables in the Vía Láctea)

Baravalle+18 2018AJ….155…46B
Se presenta un catálogo de 574 candidatos a fuentes extragalácticas detectadas en el relevamiento VISTA Variables in the Vía Láctea (VVV) que están oscurecidas por la presencia de nuestra Galaxia. En este trabajo se describe el procedimiento fotométrico desarrollado para encontrar y caracterizar objetos extragalácticos usando una combinación de SExtractor y PSFEx en dos Tiles del relevamiento VVV. Todos los candidatos fueron inspeccionados visualmente, lo cual aumenta la probabilidad de que sean galaxias confirmadas. En general, estos objetos son pequeños y más circulares, debido a la sensibilidad del infrarrojo cercano para seleccionar objetos más compactos de mayor brillo de superficial.

Spectral nuclear properties of NLS1 galaxies

Schmidt+16 2016A&A…596A..95S
We present the spectra of 36 narrow-line Seyfert 1 galaxies from the Véron & Véron catalog (Véron – Cetty & Véron 2010) with z < 0.15, brighter than b< 18 and with δ ≤ 10°. Spectra were taken at CASLEO 2.15 m. telescope, with a 600 lines/mm grating giving a resolution of 170 km/s FWHM around Hα. The observations are in the range of 5800Å a 6800Å.
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Galaxy groups in the 2M++

Díaz-Gimenez E., Zandivarez A. 2015A&A…578A..61D
Díaz-Gimenez+15 present a sample of 813 galaxy groups identified in the 2M++ catalogue is provided. Groups were identified in redshift space with a Friends-of-Friends algorithm with overdensity contour contrast of 433 (present value of the overdenstity contrast contour for virialized structures in a cosmology Lambda CDM - WMAP1). Groups have virial masses larger than 10¹² Msun and 4 or more members. The 4869 member galaxies have observer frame apparent magnitude in the K_2M++ brighter than 12.5
Download Díaz-Gimenez+15.

Catálogo de Grupos Compactos en el 2MASX

Díaz-Gimenez E., Mamon G.A., Pacheco M., Mendes De Oliveira C., Alonso M.V. 2012MNRAS.426..296D
A sample of 85 compact groups with spectroscopic information for all of their member galaxies is extracted from the Two-Micron All Sky Survey extended source catalogue (2MASX). The automatic searching algorithm follows the original criteria defined by Hickson. This v2MCG sample of velocity-filtered CGs constitutes the largest sample of CGs (with N≥4) catalogued to date, with both well-defined selection criteria and velocity filtering, and is the first CG sample selected by stellar mass. It is fairly complete up to Kgroup∼9 and radial velocity of ∼6000km/s.
Download Díaz-Gimenez+12.

Galaxy Clusters in SDSS

Coenda+2009. 2009A&A…504..347C
Coenda + 2009 built two subsamples of galaxy clusters with more than 10 members based on two catalogs: ROSAT-SDSS galaxy cluster survey de (Popesso + J/A+A/423/449)  and MaxBCG catalogue of(Koester+ J/ApJ/660/239). The two sub-samples of clusters of galaxies was based on a volume limited sample of galaxies drawn from the spectroscopic DR5 SDSS.

Download Coenda+2009.

Galaxy Clusters in SDSS II

Muriel+2014. 2014A&A…564A..85M
Expanded sample of the sample presented in Coenda+2009, based on the NORAS galaxy cluster survey catalog. I. (Bohringer +, 2000). Similarly, a cluster sample with more than 10 members was built, using a volume limited sample of galaxies drawn from the spectroscopic DR7 SDSS.
Download Muriel+2014.

 

 

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