ASTE 12CO(J =3–2) Survey of Elliptical Galaxies
نویسندگان
چکیده
We report 12CO(J =3–2) observations of 15 nearby elliptical galaxies carried out with the ASTE telescope. Thirteen were selected without regard to the presence of other tracers of cold interstellar matter. CO emission was detected from three of the galaxies, two of which are undetected by IRAS at 100 microns, suggesting that cold ISM may be present in more ellipticals than previously thought. The molecular gas masses range from 2.2×106 to 4.3×108 M⊙. The ratio of the CO(3–2) and (1–0) lines, R31, has a lower value for elliptical galaxies than for spiral galaxies except for NGC 855, for which the value is close to the mean for spirals. The molecular gas in NGC 855 has a mean density in the range 300 – 1000 cm−3 adopting a temperature range of 15 – 100 K.
منابع مشابه
The Physical Conditions and Dynamics of the Interstellar Medium in the Nucleus of M 83 : Observations of CO and C I Glen
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...
متن کاملThe Physical Conditions and Dynamics of the Interstellar Medium in the Nucleus of M83: Observations of Co and C I
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...
متن کاملA blind CO detection of a distant red galaxy in the HS1700+64 protocluster
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...
متن کاملTracing star formation in galaxies with molecular line and continuum observations
We report our recent progress on extragalactic spectroscopic and continuum observations, including HCN(J=1–0), HCO(J=1–0), and CN(N=1–0) imaging surveys of local Seyfert and starburst galaxies using the Nobeyama Millimeter Array, high-J CO observations (J=3–2 observations using the Atacama Submillimeter Telescope Experiment (ASTE) and J=2–1 observations with the Submillimeter Array) of galaxies...
متن کاملNRO M33 All-Disk Survey of Giant Molecular Clouds (NRO MAGiC): II. Dense Gas Formation within Giant Molecular Clouds in M33
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...
متن کامل