Surveying the whirlpool at arcseconds with NOEMA (SWAN)

• Verfasst von: Stuber, Sophia [VerfasserIn]
• Verfasst von: Pety, Jerome [VerfasserIn]
• Verfasst von: Schinnerer, Eva [VerfasserIn]
• Verfasst von: Bigiel, Frank [VerfasserIn]
• Verfasst von: Usero, Antonio [VerfasserIn]
• Verfasst von: Bešlić, Ivana [VerfasserIn]
• Verfasst von: Querejeta, Miguel [VerfasserIn]
• Verfasst von: Jiménez-Donaire, Maria Jesús [VerfasserIn]
• Verfasst von: Leroy, Adam K. [VerfasserIn]
• Verfasst von: Brok, Jakob den [VerfasserIn]
• Verfasst von: Neumann, Lukas [VerfasserIn]
• Verfasst von: Eibensteiner, Cosima [VerfasserIn]
• Verfasst von: Teng, Yu-Hsuan [VerfasserIn]
• Verfasst von: Barnes, Ashley T. [VerfasserIn]
• Verfasst von: Chevance, Mélanie [VerfasserIn]
• Verfasst von: Colombo, Dario [VerfasserIn]
• Verfasst von: Dale, Daniel A. [VerfasserIn]
• Verfasst von: Glover, Simon [VerfasserIn]
• Verfasst von: Liu, Daizhong [VerfasserIn]
• Verfasst von: Pan, Hsi-An [VerfasserIn]
• Titel: Surveying the whirlpool at arcseconds with NOEMA (SWAN)
• Verf.angabe: Sophia K. Stuber, Jerome Pety, Eva Schinnerer, Frank Bigiel, Antonio Usero, Ivana Beslic, Miguel Querejeta, Maria J. Jimenez-Donaire, Adam Leroy, Jakob den Brok, Lukas Neumann, Cosima Eibensteiner, Yu-Hsuan Teng, Ashley Barnes, Melanie Chevance, Dario Colombo, Daniel A. Dale, Simon C. O. Glover, Daizhong Liu and Hsi-An Pan
• E-Jahr: 2023
• Jahr: 20 December 2023
• Umfang: 11 S.
• Fussnoten: Gesehen am 27.03.2024
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2023
• Band/Heft Quelle: 680(2023), Artikel-ID L20, Seite 1-11
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/202348205
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: 100 PC SCALES
• Sach-SW: CLOUD
• Sach-SW: DENSE MOLECULAR GAS
• Sach-SW: FORMATION LAW
• Sach-SW: FORMATION RATES
• Sach-SW: galaxies: individual: M 51
• Sach-SW: galaxies: ISM
• Sach-SW: ISM: molecules
• Sach-SW: LINE EMISSION
• Sach-SW: MILKY-WAY
• Sach-SW: NEARBY GALAXIES
• Sach-SW: SPIRAL-ARM
• Sach-SW: STAR-FORMATION EFFICIENCY
• K10plus-PPN: 1884474640

Abstract

We present the first results from "Surveying the Whirlpool at Arcseconds with NOEMA" (SWAN), an IRAM Northern Extended Millimetre Array (NOEMA)+30 m large program that maps emission from several molecular lines at 90 and 110 GHz in the iconic nearby grand-design spiral galaxy M 51 at a cloud-scale resolution (similar to 3'' = 125 pc). As part of this work, we have obtained the first sensitive cloud-scale map of N(2)H(+)10 of the inner similar to 5 x 7 kpc of a normal star-forming galaxy, which we compared to HCN10 and 12 CO10 emission to test their ability in tracing dense, star-forming gas. The average N2H+-to-HCN line ratio of our total FoV is 0.20 +/- 0.09, with strong regional variations of a factor of >= 2 throughout the disk, including the south-western spiral arm and the center. The central similar to 1 kpc exhibits elevated HCN emission compared to N2H+, probably caused by AGN-driven excitation effects. We find that HCN and N2H+ are strongly super-linearily correlated in intensity (rho(Sp)similar to 0.8), with an average scatter of similar to 0.14 dex over a span of greater than or similar to 1.5 dex in intensity. When excluding the central region, the data are best described by a power law of an exponent of 1.2, indicating that there is more N2H+ per unit HCN in brighter regions. Our observations demonstrate that the HCN-to-CO line ratio is a sensitive tracer of gas density in agreement with findings of recent galactic studies utilising N2H+. The peculiar line ratios present near the AGN and the scatter of the power-law fit in the disk suggest that in addition to a first-order correlation with gas density, second-order physics (such as optical depth, gas temperature) or chemistry (abundance variations) are encoded in the N2H+/12 CO, HCN/12 CO, and N2H+/HCN ratios.