H2/CO Conversion Factor for M31 Molecular Clouds

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Giant Molecular Clouds in M31 – I: Molecular Cloud Properties

We present Berkeley Illinois Maryland Association (BIMA) millimeter interferometer observations of giant molecular clouds (GMCs) along a spiral arm in M31. The observations consist of a survey using the compact configuration of the interferometer and follow-up, higher-resolution observations on a subset of the detections in the survey. The data are processed using an analysis algorithm designed...

متن کامل

Cold Massive Molecular Clouds in the Inner Disk of M31

We present new interferometric CO(1-0) and single-dish CO(3-2) observations of the central parts of D478, a large (> 200 pc) dark dust cloud located in a quiescent region of the inner disk of M31 where single-dish CO(1-0) and CO(2-1) observations were previously obtained. Only a small fraction (< 15%) of the CO(1-0) flux previously detected in this region with the single-dish telescope is recor...

متن کامل

Comparing Giant Molecular Clouds in M31, M33 & the Milky Way

We present new observations of a 2 field in the north-eastern spiral arm of M31. In the 0.8 × 3.6 kpc mosaicked region, we have detected six distinct, large complexes of molecular gas, most of which lie along the spiral arm dust lane or in the vicinity of HII regions. The mean properties of these complexes are as follows: D∼57±13 pc, ∆V∼ 6.5±1.2 km s, MCO∼3.0±1.6 ×10 5 M⊙, peak brightness tempe...

متن کامل

Comparative Analysis of Molecular Clouds in M31, M33, and the Milky Way

We present BIMA observations of a 20 field in the northeastern spiral arm of M31. In this region we find six giant molecular clouds (GMCs) that have a mean diameter of 57 13 pc, a mean velocity width of 6:5 1:2 km s , and a mean molecular mass of 3:0 1:6 ð Þ ; 10 M . The peak brightness temperature of these clouds ranges from 1.6 to 4.2 K. We compare these clouds to clouds in M33 observed by Wi...

متن کامل

Face-on Barred Spiral Structure of Molecular Clouds in M31's Bulge

By image processing and color excess analyses of B, V, R, and I-band CCD images of the central region of M31 taken with the Kiso 105-cm Schmidt telescope, we found a bar of 200 pc length. We also found a more extended " face-on " spiral feature of dark clouds, which appear to be connected to this bar and is probably an out-of-plane structure. The 12 CO(J = 1 − 0)-line emission was detected from...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: International Astronomical Union Colloquium

سال: 1994

ISSN: 0252-9211

DOI: 10.1017/s0252921100020029