2019A&A...621A..70P


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.24CET01:23:37

2019A&A...621A..70P - Astronomy and Astrophysics, volume 621A, 70-70 (2019/1-1)

Comparative study of gamma-ray emission from molecular clouds and star-forming galaxies.

PENG F.-K., XI S.-Q., WANG X.-Y., ZHI Q.-J. and LI D.

Abstract (from CDS):

Star-forming regions on different scales, such as giant molecular clouds in our Galaxy and star-forming galaxies, emit GeV gamma-rays. These are thought to originate from hadronic interactions of cosmic-ray (CR) nuclei with the interstellar medium. It has recently been shown that the gamma-ray luminosity (Lγ) of star-forming galaxies is well correlated with their star formation rates (SFR). We investigated Fermi data of eight Galactic molecular clouds in the Gould belt and found that molecular clouds do not follow the Lγ-SFR correlation of star-forming galaxies. We also compared the scaling relations of gamma-ray luminosity, SFR, and the gas mass for molecular clouds and star-forming galaxies. Using a multiple-variable regression analysis, we found different dependences of gamma-ray emission on SFR or mass for molecular clouds and star-forming galaxies. This suggests that different mechanisms may govern the production of gamma-rays in these two types of sources. Specifically, the strong dependence on mass supports that gamma-ray emission of molecular clouds primarily comes from passive interaction by diffuse Galactic CRs, whereas the strong dependence on SFR supports that gamma-ray emission of star-forming galaxies originates from CRs that are accelerated by local active sources.

Abstract Copyright: © ESO 2019

Journal keyword(s): cosmic rays - ISM: clouds - gamma rays: ISM - methods: statistical

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11155 1
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2987 2
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9656 1
4 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1102 0
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3614 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15122 1
7 NAME Ori A MoC 05 38 -07.1           ~ 2720 0
8 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1201 0
9 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 661 2
10 NGC 2146 SBG 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 637 2
11 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5410 6
12 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1390 0
13 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 704 0
14 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2718 4
15 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3114 1
16 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 409 0
17 NAME Local Arm reg ~ ~           ~ 390 0
18 NAME Gould Belt PoG ~ ~           ~ 737 1

    Equat.    Gal    SGal    Ecl

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2021.01.24-01:23:37

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