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Two Orders of Magni...
Two Orders of Magnitude Variation in the Star Formation Efficiency across the Premerger Galaxy NGC 2276
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- Tomičić, Neven (författare)
- Max Planck Institute for Astronomy
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- Hughes, Annie (författare)
- Centre d'Ecologie Fonctionnelle et Evolutive (CEFE),University of Toulouse
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- Kreckel, Kathryn (författare)
- Max Planck Institute for Astronomy
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- Renaud, Florent (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Pety, Jérôme (författare)
- Institut de Radioastronomie Millimétrique IRAM
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- Schinnerer, Eva (författare)
- Max Planck Institute for Astronomy
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- Saito, Toshiki (författare)
- Max Planck Institute for Astronomy
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- Querejeta, Miguel (författare)
- European Southern Observatory
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- Faesi, Christopher M. (författare)
- Max Planck Institute for Astronomy
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- Garcia-Burillo, Santiago (författare)
- Royal Observatory of Madrid
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(creator_code:org_t)
- 2018-12-21
- 2018
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 869:2
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://doi.org/10.3...
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https://lup.lub.lu.s...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- We present the first spatially resolved (∼0.5 kpc) measurements of the molecular gas depletion time τ depl across the disk of the interacting spiral galaxy NGC 2276, a system with an asymmetric morphology in various star formation rate (SFR) tracers. To estimate τ depl, we use new NOEMA observations of the 12CO(1-0) emission tracing the bulk molecular gas reservoir in NGC 2276, and extinction-corrected Hα measurements obtained with the PMAS/PPaK integral field unit for robust estimates of the SFR. We find a systematic decrease in τ depl of 1-1.5 dex across the disk of NGC 2276, with a further, abrupt drop in τ depl of ∼1 dex along the galaxy's western edge. The global τ depl in NGC 2776 is τdepl = 0.55 Gyr, consistent with literature measurements for the nearby galaxy population. Such a large range in τ depl on subkiloparsec scales has never previously been observed within an individual isolated or premerger system. When using a metallicity-dependent molecular gas conversion factor the variation decreases by 0.5 dex. We attribute the variation in τ depl to the influence of galactic-scale tidal forces and ram pressure on NGC 2276's molecular interstellar medium. Our observations add to the growing body of numerical and observational evidence that galaxy-galaxy interactions significantly modify the molecular gas properties and star-forming activity within galactic disks throughout the interaction, and not just during the final merger phase.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies: individual (NGC 2276)
- galaxies: ISM
- galaxies: star formation
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Tomičić, Neven
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Hughes, Annie
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Kreckel, Kathryn
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Renaud, Florent
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Pety, Jérôme
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Schinnerer, Eva
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visa fler...
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Saito, Toshiki
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Querejeta, Migue ...
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Faesi, Christoph ...
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Garcia-Burillo, ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Astronomi astrof ...
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Lunds universitet