H I content of selected mid-infrared bright, starburst blue compact dwarf galaxies

Yogesh Chandola, Di Li, Chao Wei Tsai, Guodong Li, Yingjie Peng, Pei Zuo, Travis McIntyre, Yin Zhe Ma, Daniel Stern, Roger Griffith, Thomas Jarrett, Peter Eisenhardt, Chantal Balkowski

Research output: Contribution to journalArticlepeer-review

5 Citations (Web of Science)

Abstract

We report measurements of H I content in 11 nearby, actively star-forming, blue compact dwarf galaxies (BCDs) from 21 cm observations with the Arecibo telescope. These BCDs, selected by their red (W2[4.6 μm]−W3[12 μm]>3.8 mag) and bright mid-infrared (MIR) emission (W4[22 μm]<7.6 mag), have high specific star formation rates (median sSFR ∼10−7.8 yr−1), similar to high redshift galaxies. H I emission was detected in six sources. We analyse our new detections in the context of previous H I observations of 218 dwarf irregulars (dIs) and BCDs in the literature. The MH I–M relation resulting from our observations confirms the dominating fraction of H I gas among baryons in galaxies with lower stellar masses. This Arecibo BCD sample has significantly lower median H I depletion time-scales (τH I ∼ 0.3 Gyr) than other dIs/BCDs (∼ 6.3 Gyr) in the literature. The majority of the sources (10/11) in the Arecibo sample are very red in W1[3.4 μm]−W2[4.6 μm] colour (>0.8 mag) implying the presence of warm dust. We investigate the relation of τHI with stellar mass (M) and sSFR. We find that τH I is significantly anticorrelated with M for higher sSFR (>10−8.5 yr−1) and with sSFR for higher stellar mass (> 107.5 M) dwarf galaxies. The high sSFR for the BCDs in the Arecibo observed sample is mainly due to their high atomic gas star formation efficiency (SFE) or low τH I. The low τH I or high SFE in these sources is possibly due to runaway star formation in compact and dense super star clusters.

Original languageEnglish
Pages (from-to)603-619
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume527
Issue number1
Early online date2 Nov 2023
DOIs
Publication statusPublished - 1 Jan 2024

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