In this paper, we investigate the relevance of using the 12CO-line emissions as indicators of star formation rates (SFRs). For the first time, we present this study for a relatively large number of 12CO transitions (12) as well as over a large interval in redshift (from z ∼ 0 to 6). For the nearby sources (D ≤ 10 Mpc), we have used our previously published homogeneous sample of 12CO data, mixin...

We report the blind detection of 12CO emission from a distant red galaxy, HS1700.DRG55.We have used the IRAM Plateau de Bure Interferometer WideX, with its 3.6 GHz of instantaneous dual-polarization bandwidth, to target 12CO(3–2) from galaxies lying in the protocluster at z = 2.300 in the field HS1700+64. If indeed this line in DRG55 is 12CO(3–2), its detection at 104.9GHz indicates zCO = 2.296...

We present 13CO(1–0) and 12CO(2–1) aperture synthesis maps of the barred spiral galaxy NGC 1530. The angular resolutions are respectively3′′.1 and 1′′.6. Both transitions show features similar to the 12CO(1–0) map, with a nuclear feature (a ring or unresolved spiral arms) surrounded by two curved arcs. The average line ratios are 12CO(1–0)/13CO(1–0)= 9.3 and 12CO(2–1)/12CO(1–0)= 0.7. The 12CO/1...

This paper presents [C I], 12CO J=4−3, and 12CO J=3−2 maps of the barred spiral galaxy M83 taken at the James Clerk Maxwell Telescope. Observations indicate a double peaked structure which is consistent with gas inflow along the bar collecting at the inner Lindblad resonance. This structure suggests that nuclear starbursts can occur even in galaxies where this inflow/collection occurs, in contr...

This paper presents [C I], 12CO J=4−3, and 12CO J=3−2 maps of the barred spiral galaxy M83 taken at the James Clerk Maxwell Telescope. Observations indicate a double peaked structure which is consistent with gas inflow along the bar collecting at the inner Lindblad resonance. This structure suggests that nuclear starbursts can occur even in galaxies where this inflow/collection occurs, in contr...

High resolution OVRO aperture synthesis maps of the 12CO 1–0 emission in the “Medusa” galaxy merger (NGC 4194) reveal the molecular emission being surprisingly extended. The 12CO emission is distributed on a total scale of 25′′ (4.7 kpc) — despite the apparent advanced stage of the merger. The complex, striking 12CO morphology occupies mainly the center and the north-eastern part of the main op...

We present new observations of the merging system Arp 299 obtained with the IRAM Plateau de Bure interferometer. We have observed the 12CO(1 − 0), 12CO(2 − 1), 13CO(1 − 0) and HCN(1-0)lines. For the 12CO(1 − 0) line, short spacings were recovered by using 30m data; about half of the total flux is found in weak and extended emission filtered out by the interferometer. The 12CO(1 − 0)map shows th...

We present observations of 13CO(1–0) in 17 Combined Array for Research in Millimeter Astronomy ATLAS3D early-type galaxies (ETGs), obtained simultaneously with 12CO(1–0) observations. The 13CO in six ETGs is sufficiently bright to create images. In these six sources, we do not detect any significant radial gradient in the 13CO/12CO ratio between the nucleus and the outlying molecular gas. Using...

Wehave performed 12CO(1–0), 12CO(2–1), 13CO(1– 0), 13CO(2–1), C18O(1–0), C18O(2–1), HCO+(1–0) and H13CO+(1–0) observations towards two selected areas in the star forming complex NGC 6357 with angular resolutions from 21′′ to 55′′. In particular, we have mapped the molecular gas around the twoHii regions G353.1+0.6 andG353.2+0.9 in the 12CO(1– 0) and 13CO(1–0) transitions with a resolution of ∼ ...

We have conducted observations of the 12CO(J=1–0) and 12CO(J = 3–2) line emission of 74 major giant molecular clouds (GMCs) within the galactocentric distance of 5.1 kpc in the Local Group galaxy M33 [1]. The observations are part of the Nobeyama Radio Observatory M33 All-disk survey of Giant Molecular Clouds project (NRO MAGiC [2]). The spatial resolution is 100 pc. We detect 12CO(J = 3–2) emi...