A search for stellar tidal streams around Milky Way analogues from the SAGA sample

© The Authors 2023. We want to thank to Yao-Yuan Mao, Marla Geha and Risa Wechsler for providing the original SAGA sample for this paper and useful comments. We also thank Dustin Lang and John Moustakas for running the modified Legacypipe code to produce the images used here. DMD acknowledges financial support from the Talentia Senior Program (through the incentive ASE-136) from Secretaría General de Universidades, Investigación y Tecnología, de la Junta de Andalucía. DMD acknowledges funding from the State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ochoa” award to the Instituto de Astrofísica de Andalucía (SEV-2017- 0709) and project (PDI2020-114581GB-C21/ AEI / 10.13039/501100011033). MAGF acknowledges financial support from the Spanish Ministry of Science and Innovation through the project PID2020-114581GB-C22. SRF acknowledges financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) under grant number AYA2016-75808-R, AYA2017-90589- REDT and S2018/NMT-429, and from the CAM-UCM under grant number PR65/19-22462. SRF acknowledges support from a Spanish postdoctoral fellowship, under grant number 2017-T2/TIC-5592. APC is supported by the Taiwan Ministry of Education Yushan Fellowship and Taiwan National Science and Technology Council grant 109-2112-M-007-011-MY3. The photometry analysis in this work was partly done using GNU Astronomy Utilities (Gnuastro, ascl.net/1801.009) version 0.17. Work on Gnuastro has been funded by the Japanese MEXT scholarship and its Grant-in-Aid for Scientific Research (21244012, 24253003), the European Research Council (ERC) advanced grant 339659-MUSICOS, and from the Spanish Ministry of Economy and Competitiveness (MINECO) under grant number AYA2016-76219-P. The Leiden Observatory has provided facilities and computer infrastructure for carrying out part of this work. MA acknowledges the financial support from the Spanish Ministry of Science and Innovation and the European Union - NextGenerationEU through the Recovery and Resilience Facility project ICTS-MRR-2021-03-CEFCA.Context. Stellar tidal streams are the result of tidal interactions between a central galaxy and lower mass systems such as satellite galaxies or globular clusters. For the Local Group, many diffuse substructures have been identified and their link to the galaxy evolution has been traced. However, it cannot simply be assumed that the Milky Way or M 31 are representative of their galaxy class. Thus, a larger sample of analogue galaxies beyond the Local Group is required to bolster a broader generalisation of the underlying theory. Aims. We want to detect and photometrically characterise stellar streams around Milky Way (MW-) analogues in the local Universe in order to extend the observational evidence of interactions between this class of host galaxies and their satellites. This information will be applicable in a more general context around future studies on galaxy formation and evolution processes. Methods. In the present work, we identified and analysed stellar tidal streams around MW-analogue galaxies from the SAGA sample, using deep images of the DESI Legacy Imaging Surveys. For this sample, we obtained a range of r-band surface brightness limit between 27.8 and 29 mag arcsec^(−2) . We measured the surface brightness and colours of the detected streams using GNU Astronomy Utilities software. Results. We identified 16 new stellar tidal streams around MW-analogue galaxies at distances between 25 and 40 Mpc. In applying a statistical analysis to our findings for the SAGA II galaxy sample, we obtained a frequency of 12.2% ± 2.4% for these stellar streams. We measured the surface brightness and colours of the detected streams and carried out a comparison to the dwarf satellite galaxies population around galaxies belonging to the same SAGA sample. We show that the mean colour of the streams is 0.20 mag redder than that of the SAGA satellites; in addition, the streams are, on average, 0.057 ± 0.021 mag redder that their progenitor (for cases where a likely progenitor could be identified). Conclusions. The frequency of streams detected around MW-analogues in the Local Universe is in agreement with previous studies. The difference in colour between detected streams and satellites within the SAGA host galaxy sample could be explained by a combination of both selection biases in the SAGA study and physical processes.Depto. de Física de la Tierra y AstrofísicaFac. de Ciencias FísicasTRUETalentia Senior Program (through the incentive ASE-136) from Secretaría General de Universidades, Investigación y Tecnología, de la Junta de AndalucíaCentro de Excelencia Severo OchoaMinisterio de Ciencia, Innovación y Universidades (MCIU)Ministerio de Economía y Competitividad (MINECO)CAM-UCMSpanish postdoctoral fellowshipTaiwan Ministry of Education Yushan FellowshipTaiwan National Science and Technology CouncilJapanese MEXT scholarshipEuropean Research Council (ERC)European Union - NextGeneration through the Recovery and Resilience Facility projectInstituto de Astrofísica de Andalucíapu

Planes of satellites around simulated disk galaxies I: finding high-quality planar configurations from positional information and their comparison to MW/M31 data

We address the “plane of satellites problem” by studying planar configurations around two disk galaxies with no late major mergers, formed in zoom-in hydro-simulations. Due to the current lack of good-quality kinematic data for M31 satellites, we use only positional information. So far, positional analyses of simulations are unable to find planes as thin and populated as the observed ones. We follow a novel systematic and detailed plane searching technique to study the properties and quality of planes of satellites, in both simulations or real data. In particular, (i) we extend the four-galaxy-normal density plot method (Pawlowski et al. 2013) in a way designed to efficiently identify high-quality planes (i.e., thin and populated) without imposing extra constraints on their properties, and (ii), we apply it for the first time to simulations. Using zoom-in simulations allows us to mimic Milky Way/M31- like systems regarding the number of satellites involved as well as galactic disk effects. In both simulations, we find satellite planar configurations that are compatible, along given time intervals, with all of the spatial characteristics of observed planes identified using the same methodology. During most of these periods, planes are approximately perpendicular to the galactic disk. However, the fraction of co-orbiting satellites within them is, in general, low, suggesting time-varying satellite membership. We conclude that high-quality positional planes of satellites could be not infrequent in ΛCDM-formed disk galaxies with a quiet assembly history. Detecting kinematically coherent, time-persistent planes demands considering the full six-dimensional phase-space information of satellites

Diseño y desarrollo de un curso de formación en el entorno Moodle sobre el desarrollo de competencias éticas

Se diseñan y desarrollan materiales para dos cursos que se prueban en entorno moodle sobre las competencias éticas de "engañar para aprobar" y "ocultar información"

Estudio de la evolucion dinamica de galaxias en entornos densos

Centro de Informacion y Documentacion Cientifica (CINDOC). C/Joaquin Costa, 22. 28002 Madrid. SPAIN / CINDOC - Centro de Informaciòn y Documentaciòn CientìficaSIGLEESSpai

Planes of satellites around simulated disk galaxies. II. Time-persistent planes of kinematically coherent satellites in ΛCDM

© 2023. The Author(s). Artículo firmado por 11 autores. We thank the anonymous referee for useful comments. This work was supported through MINECO/FEDER (Spain) AYA2012-31101, AYA2015-63810-P, and MICIIN/FEDER (Spain) PGC2018-094975-C21 grants. I.S.-S. acknowledges support by the European Research Council (ERC) through Advanced Investigator grant to C.S. Frenk, DMIDAS (GA 786910). M.G.M. thanks MINECO/FEDER funding through a FPI fellowship associated with this grant. P.B.T. acknowledges partial funding by Fondecyt 1200703/2020 (ANID), Nucleo Milenio Anid NCN2021-017 and the CATA-Basal-FB210003 project. M.A.G.F. acknowledges financial support from the Spanish Ministry of Science and Innovation through the project PID2020-114581GB-C22. V.R.-P. thanks the Comunidad de Madrid, Consejería de Ciencia, Universidades e Innovación, for funding him through contract No. PEJ-2019-TIC-15074. This work used the Geryon cluster (Pontificia Universidad de Chile). We used a version of Aq-C-5 that is part of the CIELO Project run in Marenostrum (Barcelona Supercomputer Centre), the NLHPC (funded by ECM-02), and the Ladgerda cluster (Fondecyt 12000703). This project has received funding from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie grant agreement No. 734374-LACEGAL.We use two zoom-in ΛCDM hydrodynamical simulations of massive disk galaxies to study the possible existence of fixed satellite groups showing a kinematically coherent behavior across evolution (angular momentum conservation and clustering). We identify three such groups in the two simulations, defining kinematically coherent persistent planes (KPPs) that last at least from virialization to z = 0 (more than 7 Gyr). This proves that orbital pole clustering is not necessarily set in at low redshift, representing a long-lived property of galaxy systems. KPPs are thin and oblate, represent ∼25%–40% of the total number of satellites in the system, and are roughly perpendicular to their corresponding central disk galaxies during certain periods, consistently with Milky Way z = 0 data. KPP satellite members are statistically distinguishable from satellites outside KPPs: they show higher specific orbital angular momenta, orbit more perpendicularly to the central disk galaxy, and have larger pericentric distances than the latter. We numerically prove, for the first time, that KPPs and the best-quality positional planes share the same space configuration across time, such that KPPs act as “skeletons” preventing the latter from being washed out in short timescales. In one of the satellite−host systems, we witness the late capture of a massive dwarf galaxy endowed with its own satellite system, also organized into a KPP configuration prior to its capture. We briefly explore the consequences this event has on the host’s KPP and on the possible enhancement of the asymmetry in the number of satellites rotating in one sense or the opposite within the KPP.MINECO/FEDERMICIN/FEDEREuropean Research Council (ERC) through Advanced Investigator grantFondo Nacional de Desarrollo Científico y Tecnológico (Fondecyt)Nucleo Milenio AnidMinisterio de Ciencia e Innovación (MICIN)Comunidad de Madrid, Consejería de Ciencia, Universidades e InnovaciónEuropean Union’s Horizon 2020 ResearchInnovation Programme under the Marie Sklodowska-Curie grantDepto. de Física de la Tierra y AstrofísicaFac. de Ciencias FísicasTRUEpu

Diseño y desarrollo de un curso de formación online sobre el desarrollo de competencias éticas II

Depto. de Antropología Social y Psicología SocialFac. de Ciencias Políticas y SociologíaFALSEsubmitte

Desarrollo de un glosario de términos biológicos en lengua de signos para alumnos de educación secundaria y universitaria.

Este proyecto ha permitido crear un glosario de términos biológicos en lengua de signos española. Este glosario permitirá a los alumnos sordos de enseñanza media y superior tener una mayor accesibilidad a los términos específicos de las distintas disciplinas que constituyen las Ciencias Biológicas