Two Orders of Magnitude Variation in the Star Formation Efficiency across the Premerger Galaxy NGC 2276

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Two Orders of Magnitude Variation in the Star Formation Efficiency across the Premerger Galaxy NGC 2276. / Tomičić, Neven; Hughes, Annie; Kreckel, Kathryn; Renaud, Florent; Pety, Jérôme; Schinnerer, Eva; Saito, Toshiki; Querejeta, Miguel; Faesi, Christopher M.; Garcia-Burillo, Santiago.

I: Astrophysical Journal Letters, Vol. 869, Nr. 2, L38, 20.12.2018.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Tomičić, N, Hughes, A, Kreckel, K, Renaud, F, Pety, J, Schinnerer, E, Saito, T, Querejeta, M, Faesi, CM & Garcia-Burillo, S 2018, 'Two Orders of Magnitude Variation in the Star Formation Efficiency across the Premerger Galaxy NGC 2276', Astrophysical Journal Letters, vol. 869, nr. 2, L38. https://doi.org/10.3847/2041-8213/aaf810

APA

CBE

Tomičić N, Hughes A, Kreckel K, Renaud F, Pety J, Schinnerer E, Saito T, Querejeta M, Faesi CM, Garcia-Burillo S. 2018. Two Orders of Magnitude Variation in the Star Formation Efficiency across the Premerger Galaxy NGC 2276. Astrophysical Journal Letters. 869(2). https://doi.org/10.3847/2041-8213/aaf810

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Tomičić, Neven ; Hughes, Annie ; Kreckel, Kathryn ; Renaud, Florent ; Pety, Jérôme ; Schinnerer, Eva ; Saito, Toshiki ; Querejeta, Miguel ; Faesi, Christopher M. ; Garcia-Burillo, Santiago. / Two Orders of Magnitude Variation in the Star Formation Efficiency across the Premerger Galaxy NGC 2276. I: Astrophysical Journal Letters. 2018 ; Vol. 869, Nr. 2.

RIS

TY - JOUR

T1 - Two Orders of Magnitude Variation in the Star Formation Efficiency across the Premerger Galaxy NGC 2276

AU - Tomičić, Neven

AU - Hughes, Annie

AU - Kreckel, Kathryn

AU - Renaud, Florent

AU - Pety, Jérôme

AU - Schinnerer, Eva

AU - Saito, Toshiki

AU - Querejeta, Miguel

AU - Faesi, Christopher M.

AU - Garcia-Burillo, Santiago

PY - 2018/12/20

Y1 - 2018/12/20

N2 - 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.

AB - 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.

KW - galaxies: individual (NGC 2276)

KW - galaxies: ISM

KW - galaxies: star formation

U2 - 10.3847/2041-8213/aaf810

DO - 10.3847/2041-8213/aaf810

M3 - Article

VL - 869

JO - Astrophysical Journal Letters

T2 - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8213

IS - 2

M1 - L38

ER -