Agrupamiento de blazares

DONOSO, L.; DONOSO, E; LOPEZ, CLAUDIO

San Juan

Congreso; 65º Reunión Anual de la Asociación Argentina de Astronomía; 2023

Asociación Argentina de Astronomía

In this study, we analyze the clustering of galaxies around confirmed gamma-ray blazars. To carry this out, we estimated the two-point projected cross-correlation function between a sample of 427 BL Lacertaeand 166 Flat Spectrum Radio Quasars with a sample of non-active galaxies selected from The Sloan Digital Sky Survey. Blazars were chosen at z < 0.8 from Roma-BZCAT multi-frequency catalog, the largest list of gamma-ray detected blazars. We find that Fermi BL Lac and FSRQ show similar clustering strengths at projected scales above ∼2 h−1Mpc. Both populations seem to reside in environments of similar density, which supports the unification scheme based in orientation and that they are hosted in dark matter haloes of similar mass. At small to intermediate scales (∼1 h−1Mpc), BL Lac are more strongly clustered than FSRQ. These are the central regions of haloes where a number of different physical processes such as interactions and mergers affect the two-pointstatistics and the physical properties of galaxies. We also find differences in the clustering between both blazar populations and respective control inactive galaxies matched in redshift and colors. After analyzing the properties of neighbouring galaxies around BL Lac and FSRQ, we found that inactive galaxies tend to be brighter and redder in nearby regions around both blazar populations, but there is no significant difference between the companions of BL Lac and FSRQ sources.