2011A&A...527A..16S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST23:10:07

2011A&A...527A..16S - Astronomy and Astrophysics, volume 527A, 16-16 (2011/3-1)

The JCMT Nearby Galaxies Legacy Survey. VI. The distribution of gas and star formation in M 81.

SANCHEZ-GALLEGO J.R., KNAPEN J.H., HEINER J.S., WILSON C.D., WARREN B.E., ALLEN R.J., AZIMLU M., BARMBY P., BENDO G.J., COMERON S., ISRAEL F.P., SERJEANT S., TILANUS R.P.J., VLAHAKIS C. and VAN DER WERF P.

Abstract (from CDS):

We present the first complete 12CO J=3-2 map of M81, observed as part of the Nearby Galaxies Legacy Survey being carried out at the James Clerk Maxwell Telescope. We detect nine regions of significant CO emission located at different positions within the spiral arms, and confirm that the global CO emission in the galaxy is low. We combine these data with a new Hα map obtained using the Isaac Newton Telescope and archival Hi, 24µm, and FUV images to uncover a correlation between the molecular gas and star forming regions in M81. For the nine regions detected in CO J=3-2, we combine our CO J=3-2 data with existing CO J=1-0 data to calculate line ratios. We find that the ratio J=(3-2)/(1-0) is in agreement with the range of typical values found in the literature (0.2-0.8). Making reasonable assumptions, this allows us to constrain the hydrogen density to the range (103-104)cm–3. We also estimated the amount of hydrogen produced in photo-dissociation regions near the locations where CO J=3-2 was detected.

Abstract Copyright:

Journal keyword(s): ISM: molecules - galaxies: star formation - galaxies: ISM - HII regions - ISM: atoms

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3962 5
2 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 969 2

    Equat.    Gal    SGal    Ecl

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2020.07.03-23:10:07

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