Meet the Neighbors: Gas Rich “Buddy Galaxies” are Common around Recently Quenched Massive Galaxies in the SQuIGG; ; ; ; <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">; <mml:mover>; <mml:mrow>; <mml:mi>L</mml:mi>; </mml:mrow>; <mml:mrow>; <mml:mo>→</mml:mo>; </mml:mrow>; </mml:mover>; </mml:math>; ; E Survey | CU Experts

Abstract; In this work, we characterize the environments of massive (; ; ; ; ; log; (; ; ; M; ; ; ⊙; ; ; /; ; ; M; ; ; ⋆; ; ; ); ∼; 11.2; ; ; ) z ∼ 0.7 post-starburst galaxies (PSBs) by studying serendipitously detected CO(2–1) emitters found in targeted observations of the Studying QUenching in Intermediate-redshift Galaxies: Gas, angu; ; ; ; ; ; ; L; ; ; →; ; ; ; ; ar Momentum, and Evolution (SQuIGG; ; ; ; ; ; ; L; ; ; →; ; ; ; ; E) sample. We report 31% ± 6% of the galaxies from this survey host nearby gas-rich “buddies” with stellar masses ≥1010 M; ⊙ and molecular gas comparable to their central PSBs (; ; ; ; ; ; ; M; ; ; ; ; H; ; ; 2; ; ; ; ; ∼; 1; ; ; 0; ; ; 10; ; ; ; ; M; ; ; ⊙; ; ; ; ; ), but ∼0.8 dex lower stellar mass (∼1010.4; M; ⊙). Based on their location in position-velocity space, each buddy is consistent with being bound to the haloes of their SQuIGG; ; ; ; ; ; ; L; ; ; →; ; ; ; ; E host galaxies. We compare to the UniverseMachine model and find that SQuIGG; ; ; ; ; ; ; L; ; ; →; ; ; ; ; E galaxies host a typical number of neighbors for their stellar mass, suggesting that PSBs live in environments typical of co-eval similarly massive galaxies.

Kumar A; Setton DJ; Bezanson R; Pearl A; Stumbaugh E; Spilker JS; D’Onofrio VR; Greene JE; Suess KA; Verrico ME

VIVO