2010A&A...521A..48S


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.22CEST06:02:41

2010A&A...521A..48S - Astronomy and Astrophysics, volume 521, A48-48 (2010/10-1)

Kiloparsec-scale star formation law in M 81 and M 101 based on AKARI far-infrared observations.

SUZUKI T., KANEDA H., ONAKA T., NAKAGAWA T. and SHIBAI H.

Abstract (from CDS):

We assess the relationships between the surface densities of the gas and star formation rate (SFR) within spiral arms of the nearby late-type spiral galaxies M81 and M101. By analyzing these relationships locally, we empirically derive a kiloparsec scale Kennicutt-Schmidt Law (ΣSFR∝ΣNgas). Both M81 and M101 were observed with the Far-Infrared Surveyor (FIS) aboard AKARI in four far-infrared bands at 65, 90, 140, and 160µm. The spectral energy distributions of the whole galaxies show the presence of the cold dust component (TC∼20K) in addition to the warm dust component (TW∼60K). We deconvolved the cold and warm dust emission components spatially by making the best use of the multi-band photometric capability of the FIS. The cold and warm dust components show power-law correlations in various regions, which can be converted into the gas mass and the SFR, respectively. We find a power-law correlation between the gas and SFR surface densities with significant differences in the power-law index N between giant HII regions (N=1.0±0.5) and spiral arms (N=2.2±0.2) in M101. The power-law index for spiral arms in M81 is similar (N=1.9±0.4) to that of spiral arms in M101. The power-law index is not always constant within a galaxy. The difference can be attributed to the difference in the star formation processes on a kiloparsec scale. N≃2 seen in the spiral arms in M81 and M101 supports the scenario of star formation triggered by cloud-cloud collisions enhanced by a spiral density wave, while N≃1 derived in giant HII regions in M101 suggests the star formation induced by the Parker instability triggered by high-velocity HI gas infall. The present method can be applied to a large galaxy sample for which the AKARI All Sky Survey provides the same 4 far-infrared band data.

Abstract Copyright:

Journal keyword(s): dust, extinction - stars: formation - galaxies: structure - galaxies: individual: M81 - galaxies: individual: M101 - infrared: ISM

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10505 1
2 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1563 1
3 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3878 5
4 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5191 6
5 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3665 4
6 NGC 5447 HII 14 02 28.0 +54 16 34           ~ 65 0
7 NGC 5455 H2G 14 03 01.17 +54 14 29.4           ~ 92 0
8 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2460 2
9 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 168 0
10 NGC 5462 HII 14 03 53.0963767939 +54 22 06.523516069           ~ 74 0
11 NGC 5477 G 14 05 33.318 +54 27 37.85 13.94 14.36 14.01     ~ 169 1
12 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2167 2

    Equat.    Gal    SGal    Ecl

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2019.08.22-06:02:41

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