Details

Autor(en) / Beteiligte

• Kannappan, Sheila J
• Stark, David V
• Eckert, Kathleen D
• Moffett, Amanda J
• Wei, Lisa H
• Pisano, D J
• Baker, Andrew J
• Vogel, Stuart N
• Fabricant, Daniel G
• Laine, Seppo
• Norris, Mark A
• Jogee, Shardha
• Lepore, Natasha
• Hough, Loren E
• Weinberg-Wolf, Jennifer

Titel

CONNECTING TRANSITIONS IN GALAXY PROPERTIES TO REFUELING

Ist Teil von

• The Astrophysical journal, 2013-11, Vol.777 (1), p.1-26

Ort / Verlag

United States

Erscheinungsjahr

2013

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We relate transitions in galaxy structure and gas content to refueling, here defined to include both the external gas accretion and the internal gas processing needed to renew reservoirs for star formation. We analyze two z = 0 data sets: a high-quality ~200 galaxy sample (the Nearby Field Galaxy Survey, data release herein) and a volume-limited ~3000 galaxy sample with reprocessed archival data. Both reach down to baryonic masses ~10 super(9) M sub([middot in circle]) and span void-to-cluster environments. Two mass-dependent transitions are evident: (1) below the "gas-richness threshold" scale (V ~ 125 km s super(-1)), gas-dominated quasi-bulgeless Sd-Im galaxies become numerically dominant; while (2) above the "bimodality" scale (V ~ 200 km s super(-1)), gas-starved E/S0s become the norm. Notwithstanding these transitions, galaxy mass (or V as its proxy) is a poor predictor of gas-to-stellar mass ratio M sub(gas)/M sub(*). We argue that this refueling underlies the tight M sub(gas)/M sub(*) versus color correlations often used to measure "photometric gas fractions."