Details

Autor(en) / Beteiligte

• Stark, David V.
• Kannappan, Sheila J.
• Eckert, Kathleen D.
• Florez, Jonathan
• Hall, Kirsten R.
• Watson, Linda C.
• Hoversten, Erik A.
• Burchett, Joseph N.
• Guynn, David T.
• Baker, Ashley D.
• Moffett, Amanda J.
• Berlind, Andreas A.
• Norris, Mark A.
• Haynes, Martha P.
• Giovanelli, Riccardo
• Leroy, Adam K.
• Pisano, D. J.
• Wei, Lisa H.
• Gonzalez, Roberto E.
• Calderon, Victor F.

Titel

THE RESOLVE SURVEY ATOMIC GAS CENSUS AND ENVIRONMENTAL INFLUENCES ON GALAXY GAS RESERVOIRS

Ist Teil von

• The Astrophysical journal, 2016-12, Vol.832 (2), p.126

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2016

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• ABSTRACT We present the H i mass inventory for the REsolved Spectroscopy Of a Local VolumE (RESOLVE) survey, a volume-limited, multi-wavelength census of >1500 z = 0 galaxies spanning diverse environments and complete in baryonic mass down to dwarfs of ∼109 . This first 21 cm data release provides robust detections or strong upper limits (1.4MH i < 5%-10% of stellar mass M*) for ∼94% of RESOLVE. We examine global atomic gas-to-stellar mass ratios (G/S) in relation to galaxy environment using several metrics: group dark matter halo mass Mh, central/satellite designation, relative mass density of the cosmic web, and distance to the nearest massive group. We find that at fixed M*, satellites have decreasing G/S with increasing Mh starting clearly at Mh ∼ 1012 , suggesting the presence of starvation and/or stripping mechanisms associated with halo gas heating in intermediate-mass groups. The analogous relationship for centrals is uncertain because halo abundance matching builds in relationships between central G/S, stellar mass, and halo mass, which depend on the integrated group property used as a proxy for halo mass (stellar or baryonic mass). On larger scales G/S trends are less sensitive to the abundance matching method. At fixed Mh ≤ 1012 , the fraction of gas-poor centrals increases with large-scale structure density. In overdense regions, we identify a rare population of gas-poor centrals in low-mass (Mh < 1011.4 ) halos primarily located within ∼1.5× the virial radius of more massive (Mh > 1012 ) halos, suggesting that gas stripping and/or starvation may be induced by interactions with larger halos or the surrounding cosmic web. We find that the detailed relationship between G/S and environment varies when we examine different subvolumes of RESOLVE independently, which we suggest may be a signature of assembly bias.