Nobeyama CO Atlas of Nearby Spiral Galaxies: Distribution of Molecular Gas in Barred and Nonbarred Spiral Galaxies

By N. Kuno, N. Sato, H. Nakanishi, A. Hirota, T. Tosaki, Yasuhiro Shioya, K. Sorai, N. Nakai, Kota Nishiyama, Baltsar Vila-VilarÓ. 2007

167 citations recorded by the source corpus.

The data from a CO(1 - 0) mapping survey of 40 nearby spiral galaxies performed with the Nobeyama 45-m telescope are presented. The criteria of the sample selection were (1) RC3 morphological type in the range Sa to Scd, (2) distance less than 25 Mpc, (3) inclination angle less than 79deg (RC3), (4) flux at 100 um higher than ~ 10 Jy, (5) spiral structure is not destroyed by interaction. The maps of CO cover most of the optical disk of the galaxies. We investigated the influence of bar on the distribution of molecular gas in spiral galaxies using these data. We confirmed that the degree of central concentration is higher in barred spirals than in non-barred spirals as shown by the previous works. Furthermore, we present an observational evidence that bars are efficient in driving molecular gas that lies within the bar length toward the center, while the role in bringing gas in from the outer parts of the disks is small. The transported gas accounts for about half of molecular gas within the central region in barred spiral galaxies. We found a correlation between the degree of central concentration and bar strength. Galaxies with stronger bars tend to have higher central concentration. The correlation implies that stronger bars accumulate molecular gas toward the center more efficiently. These results are consistent with long-lived bars.

Subfields: Astronomy and Astrophysics, Spectroscopy

View Paper: https://www.semanticscholar.org/paper/1ddbab52e2bba984669b3305953c9bd73c43e1e7

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Citations in the corpus

THE CO-TO-H2 CONVERSION FACTOR AND DUST-TO-GAS RATIO ON KILOPARSEC SCALES IN NEARBY GALAXIES (2012, methodology): “To quantify any (1−0) αCO offsets, we have investigated the variability of R21 in those galaxies with publicly available CO J=(1 − 0) maps from the Nobeyama survey of nearby spiral galaxies (Kuno et al. 2007).”
A study of the gas–star formation relation over cosmic time (2010, methodology): “We compiled a list of non-merging starburst galaxies from K98a, Gao & Solomon (2004), Kuno et al. (2007) and Graciá-Carpio (2009, henceforth z ∼ 0 ‘SFGs’).”
COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies – I. Relations between H2, H i, stellar content and structural properties (2011, methodology): “Recently, much effort has been put into obtaining homogeneous and relatively deep high spatial resolution molecular gas maps covering the optical discs of nearby galaxies (Regan et al. 2001; Kuno et al. 2007; Leroy et al. 2009).”
MOLECULAR GAS AND STAR FORMATION IN NEARBY DISK GALAXIES (2013, methodology): “CO (1-0) maps exist for a subset of our targets (Helfer et al. 2003; Kuno et al. 2007).”
Cold gas properties of the Herschel Reference Survey - II. Molecular and total gas scaling relations (2014, background): “It generally goes from ∼ 12% in galaxies fully mapped in CO from Kuno et al. (2007), to∼ 44% in other mapped galaxies or in objects where the single beam observations cover more than 10% of the surface of the galaxies, to∼ 100% in the remaining objects.”
HERACLES: THE HERA CO LINE EXTRAGALACTIC SURVEY (2009, methodology): “We use two data sets drawn from BIMA SONG: on-the-fly maps made with the NRAO 12-m (resolution 55′′) and the combined BIMA + 12-m data (typical resolution ∼ 6′′).”