A Multiwavelength View of IC 860: What Is in Action inside Quenching Galaxies * * Herschel is an ESA space observatory with science instruments provided by European-led principal investigator consortia and with important participation from NASA.

We present a multiwavelength study of IC 860, a nearby post-starburst galaxy at the early stage of transitioning from blue and star forming to red and quiescent. Optical images reveal a galaxy-wide, dusty outflow originating from a compact core. We find evidence for a multiphase outflow in the molecular and neutral gas phase from the CO position-velocity diagram and NaD absorption features. We constrain the neutral mass outflow rate to be ∼0.5 M ⊙ yr−1, and the total hydrogen mass outflow rate to be ∼12 M ⊙ yr−1. Neither outflow component seems able to escape the galaxy. We also find evidence for a recent merger in the optical images, CO spatial distribution, and kinematics, and evidence for a buried active galactic nucleus in the optical emission line ratios, mid-IR properties, and radio spectral shape. The depletion time of the molecular gas reservoir under the current star formation rate is ∼7 Gyr, indicating that the galaxy could stay at the intermediate stage between the blue and red sequence for a long time. Thus the timescales for a significant decline in star formation rate (quenching) and gas depletion are not necessarily the same. Our analysis supports the quenching picture where outflows help suppress star formation by disturbing rather than expelling the gas and shed light on possible ongoing activities in similar quenching galaxies.

Rowlands, KateJohns Hopkins University,Space Telescope Science Institute (STScI) (författare)
Alatalo, K.Johns Hopkins University,Space Telescope Science Institute (STScI) (författare)
Sazonova, ElizavetaJohns Hopkins University (författare)
Abdurro’uf,Academia Sinica Taiwan (författare)
Heckman, TimothyJohns Hopkins University (författare)
Medling, Anne M.University of Toledo (författare)
Deustua, Susana E.National Institute of Standards and Technology (NIST) (författare)
Nyland, K.Naval Research Laboratory (författare)
Lanz, Lauranne (författare)
Petric, Andreea O.Space Telescope Science Institute (STScI) (författare)
Otter, Justin A.Johns Hopkins University (författare)
Aalto, Susanne,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)saalto (författare)
Dimassimo, Sabrina (författare)
French, K. DeckerUniversity of Illinois (författare)
Gallagher III, J. S.University of Wisconsin Madison (författare)
Roediger, Joel C.National Research Council Canada (författare)
Stepanoff, Sofia (författare)
Johns Hopkins UniversitySpace Telescope Science Institute (STScI) (creator_code:org_t)

Ingår i:Astrophysical Journal: American Astronomical Society938:11538-43570004-637X

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