Fermi observations of Cassiopeia and Cepheus: Diffuse gamma-ray emission in the outer galaxy

Abdo, A. A.

doi:10.1088/0004-637X/710/1/133

Fermi observations of Cassiopeia and Cepheus: Diffuse gamma-ray emission in the outer galaxy

Journal Article · Fri Jan 15 00:00:00 EST 2010 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/710/1/133· OSTI ID:1357581

Abdo, A. A. ^[1]

Naval Research Lab. (NRL), Washington, DC (United States); National Academy of Sciences, Washington, DC (United States); et al.

Here, we present the analysis of the interstellar γ-ray emission measured by the Fermi Large Area Telescope toward a region in the second Galactic quadrant at 100° ≤ l ≤ 145° and –15° ≤ b ≤ +30°. This region encompasses the prominent Gould Belt clouds of Cassiopeia, Cepheus, and the Polaris flare, as well as atomic and molecular complexes at larger distances, like that associated with NGC 7538 in the Perseus arm. The good kinematic separation in velocity between the local, Perseus, and outer arms, and the presence of massive complexes in each of them, make this region well suited to probe cosmic rays (CRs) and the interstellar medium beyond the solar circle. Furthermore, the γ-ray emissivity spectrum of the gas in the Gould Belt is consistent with expectations based on the locally measured CR spectra. The γ-ray emissivity decreases from the Gould Belt to the Perseus arm, but the measured gradient is flatter than expectations for CR sources peaking in the inner Galaxy as suggested by pulsars. The X CO = N(H₂)/W CO conversion factor is found to increase from (0.87 ± 0.05) × 10²⁰ cm^–2 (K km s^–1)^–1 in the Gould Belt to (1.9 ± 0.2) × 10²⁰ cm^–2 (K km s^–1)^–1 in the Perseus arm. We also derive masses for the molecular clouds under study. Dark gas, not properly traced by radio and microwave surveys, is detected in the Gould Belt through a correlated excess of dust and γ-ray emission: its mass amounts to ~50% of the CO-traced mass.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1357581

Alternate ID(s):: OSTI ID: 21394523

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 710; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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A Possible Extension of the Scutum-Centaurus Arm into the Outer Second Quadrant Sun, Yan; Xu, Ye; Yang, Ji arXiv https://doi.org/10.48550/arxiv.1412.2425	text	January 2014
Galaxy gas flows inferred from a detailed, spatially resolved metal budget Belfiore, F.; Maiolino, R.; Bothwell, M. arXiv https://doi.org/10.48550/arxiv.1503.06823	text	January 2015
Study of the diffuse gamma-ray emission from the Galactic plane with ARGO-YBJ Bartoli, B.; Bernardini, P.; Bi, X. J. arXiv https://doi.org/10.48550/arxiv.1507.06758	text	January 2015
Gas dynamics in tidal dwarf galaxies: disc formation at z=0 Lelli, F.; Duc, P. -A.; Brinks, E. arXiv https://doi.org/10.48550/arxiv.1509.05404	text	January 2015
Planck intermediate results. XLII. Large-scale Galactic magnetic fields Collaboration, Planck; Adam, R.; Ade, P. A. R. arXiv https://doi.org/10.48550/arxiv.1601.00546	text	January 2016
Imprints of Cosmic Rays in Multifrequency Observations of the Interstellar Emission Orlando, E. arXiv https://doi.org/10.48550/arxiv.1712.07127	text	January 2017
The Three-Dimensional Spatial Distribution of Interstellar Gas in the Milky Way: Implications for Cosmic Rays and High-Energy Gamma-Ray Emissions Johannesson, Gudlaugur; Porter, Troy A.; Moskalenko, Igor V. arXiv https://doi.org/10.48550/arxiv.1802.08646	text	January 2018
Dust-Gas Scaling Relations and OH Abundance in the Galactic ISM Nguyen, Hiep; Dawson, J. R.; Miville-Deschênes, M. -A. arXiv https://doi.org/10.48550/arxiv.1805.11787	text	January 2018

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