Caroline Bertemes
Cross-calibration of CO- versus dust-based gas masses and assessment of the dynamical mass budget in Herschel-SDSS Stripe82 galaxies
Bertemes, Caroline; Wuyts, Stijn; Lutz, Dieter; Förster Schreiber, Natascha M; Genzel, Reinhard; Minchin, Robert F; Mundell, Carole G; Rosario, David; Saintonge, Amélie; Tacconi, Linda
Authors
Stijn Wuyts
Dieter Lutz
Natascha M Förster Schreiber
Reinhard Genzel
Robert F Minchin
Carole G Mundell
David Rosario
Amélie Saintonge
Linda Tacconi
Abstract
We present a cross-calibration of CO- and dust-based molecular gas masses at z ≤ 0.2. Our results are based on a survey with the IRAM 30-m telescope collecting CO(1–0) measurements of 78 massive (logM⋆/M⊙> 10) galaxies with known gas-phase metallicities and with IR photometric coverage from Wide-field Infrared Survey Explorer(WISE; 22 μ m) and Herschel Spectral and Photometric Imaging Receiver (SPIRE; 250, 350, 500 μ m). We find a tight relation (∼0.17 dex scatter) between the gas masses inferred from CO and dust continuum emission, with a minor systematic offset of 0.05 dex. The two methods can be brought into agreement by applying a metallicity-dependent adjustment factor (∼0.13 dex scatter). We illustrate that the observed offset is consistent with a scenario in which dust traces not only molecular gas but also part of the HI reservoir, residing in the H2-dominated region of the galaxy. Observations of the CO(2–1) to CO(1–0) line ratio for two-thirds of the sample indicate a narrow range in excitation properties, with a median ratio of luminosities ⟨R21⟩ ∼ 0.64. Finally, we find dynamical mass constraints from spectral line profile fitting to agree well with the anticipated mass budget enclosed within an effective radius, once all mass components (stars, gas, and dark matter) are accounted for.
Citation
Bertemes, C., Wuyts, S., Lutz, D., Förster Schreiber, N. M., Genzel, R., Minchin, R. F., …Tacconi, L. (2018). Cross-calibration of CO- versus dust-based gas masses and assessment of the dynamical mass budget in Herschel-SDSS Stripe82 galaxies. Monthly Notices of the Royal Astronomical Society, 478(2), 1442-1458. https://doi.org/10.1093/mnras/sty963
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 22, 2018 |
Online Publication Date | May 22, 2018 |
Publication Date | Aug 1, 2018 |
Deposit Date | Jul 5, 2018 |
Publicly Available Date | Jul 5, 2018 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 478 |
Issue | 2 |
Pages | 1442-1458 |
DOI | https://doi.org/10.1093/mnras/sty963 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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