2020A&A...636L...8B


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.08CEST12:03:19

2020A&A...636L...8B - Astronomy and Astrophysics, volume 636, L8-8 (2020/4-1)

Discovery of a 30-degree-long ultraviolet arc in Ursa Major.

BRACCO A., BENJAMIN R.A., ALVES M.I.R., LEHMANN A., BOULANGER F., MONTIER L., MITTELMAN D., DI CICCO D. and WALKER S.

Abstract (from CDS):

Our view of the interstellar medium of the Milky Way and the universe beyond is affected by the structure of the local environment in the solar neighborhood. We present the discovery of a 30-degree-long arc of ultraviolet emission with a thickness of only a few arcminutes: the Ursa Major arc. This consists of several arclets seen in the near- and far-ultraviolet bands of the GALEX satellite. A two degree section of the arc was first detected in the Hα optical spectral line in 1997; additional sections were seen in the optical by the team of amateur astronomers included in this work. This direction of the sky is known for very low hydrogen column density and dust extinction; many deep fields for extragalactic and cosmological investigations lie in this direction. Diffuse ultraviolet and optical interstellar emission are often attributed to scattering of light by interstellar dust. The lack of correlation between the Ursa Major arc and thermal dust emission observed with the Planck satellite, however, suggests that other emission mechanisms must be at play. We discuss the origin of the Ursa Major arc as the result of an interstellar shock in the solar neighborhood.

Abstract Copyright: © ESO 2020

Journal keyword(s): ultraviolet: ISM - ISM: structure - shock waves - ISM: supernova remnants - solar neighborhood - local insterstellar matter

Simbad objects: 14

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Number of rows : 14

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 NAME Loop III SR? 01 12 +78.3           ~ 74 1
2 NAME MONOGEM SNR SNR 06 58 50 +13 55.9           ~ 88 0
3 GSH 135+29+4 sh 07 43 +79.           ~ 4 0
4 GSH 155+38-58 sh 08 52 +61.           ~ 4 0
5 NAME UMa Cloud MoC 09 35 +70.0           ~ 46 1
6 NAME Spider G 10 42 42.787 +34 26 57.39   13.31 13.09 12.84 12.85 ~ 125 0
7 NAME Antlia SNR SNR 10 44 -37.2           ~ 13 1
8 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 750 0
9 NAME Draco Cloud MoC 16 48 17 +60 11.8           ~ 66 1
10 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3474 3
11 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11613 0
12 NAME G353-34 reg 20 25 -47.0           ~ 5 1
13 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 824 0
14 SNR G070.0-21.5 SNR 21 24.0 +19 23           ~ 8 0

    Equat.    Gal    SGal    Ecl

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2020.08.08-12:03:19

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