Interstellar medium clouds in the W28 region are emitting gamma-rays and it is likely that the W28 supernova remnant is responsible, making W28 a prime candidate for the study of cosmic-ray acceleration and diffusion. Understanding the influence of both supernova remnant shocks and cosmic rays on local molecular clouds can help to identify multi-wavelength signatures of probable cosmic-ray sources. To this goal, transitions of OH, SiO, NH3, HCO+ and CS have complemented CO in allowing a characterisation of the chemically rich environment surrounding W28. This remnant has been an ideal test-bed for techniques that will complement arcminute-scale studies of cosmic-ray source candidates with future GeV-PeV gamma-ray observations.
REFERENCES
1.
V.
Kaspi
, A.
Lyne
, R.
Manchester
, S.
Johnston
, N.
D’Amico
, and S.
Shemar
, ApJ
409
, L57
–L60
(1993
).2.
3.
P.
Zhou
, S.
Safi-Harb
, Y.
Chen
, X.
Zhang
, B.
Jiang
, and G.
Ferrand
, ApJ
791
, p. 87
(2014
).4.
5.
6.
K.
Motogi
, K.
Sorai
, A.
Habe
, M.
Honma
, H.
Kobayashi
, and K.
Sato
, PASJ
63
, 31
–44
(2011
).7.
8.
9.
B.
Draine
and C.
McKee
, ARA&A
31
, 373
–432
(1993
).10.
Y.
Arikawa
, K.
Tatematsu
, Y.
Sekimoto
, and T.
Takahashi
, PASJ
51
, L7
–L10
(1999
).11.
Y.
Fukui
, “Sub-mm/mm studies of the molecular gas in the Galactic disk; the TeV gamma ray SNR RXJ1713.7-3946 and the W28 high mass star forming region
,” in American Institute of Physics Conference Series
, American Institute of Physics Conference Series
, Vol. 1085
, edited by F.
Aharonian
, W.
Hofmann
, and F.
Rieger
(2008
), pp. 104
–111
.12.
D.
Neufeld
, D.
Hollenbach
, M.
Kaufman
, R.
Snell
, G.
Melnick
, et al., ApJ
664
, 890
–908
(2007
).13.
R.
Marquez-Lugo
and J.
Phillips
, MNRAS
407
, 94
–112
(2010
).14.
D.
Frail
, W.
Goss
, and V.
Slysh
, ApJ
424
, L111
–L113
(1994
).15.
M.
Claussen
, D.
Frail
, W.
Goss
, and R.
Gaume
, ApJ
489
, 143
–159
(1997
).16.
17.
P.
Lockett
, E.
Gauthier
, and M.
Elitzur
, ApJ
511
, 235
–241
(1999
).18.
Y.
Pihlström
, V.
Fish
, L.
Sjouwerman
, L.
Zschaechner
, P.
Lockett
, and M.
Elitzur
, ApJ
676
, 371
–377
(2008
).19.
M.
Wardle
, ApJ
525
, L101
–L104
(1999
).20.
21.
G.
Dubner
, P.
Velázquez
, W.
Goss
, and M.
Holdaway
, AJ
120
, 1933
–1945
(2000
).22.
B.
Nicholas
, G.
Rowell
, M.
Burton
, A.
Walsh
, Y.
Fukui
, et al., MNRAS
411
, 1367
–1385
(2011
).23.
R.
Nakamura
, A.
Bamba
, M.
Ishida
, R.
Yamazaki
, K.
Tatematsu
, et al., PASJ
66
, p. 62
(2014
).24.
N.
Maxted
, P.
de Wilt
, G.
Rowell
, B.
Nicholas
, M.
Burton
, et al., MNRAS
462
, 532
–546
(2016
).25.
B.
Nicholas
, G.
Rowell
, M.
Burton
, A.
Walsh
, Y.
Fukui
, et al., MNRAS
419
, 251
–266
(2012
).26.
L.
Ziurys
, R.
Snell
, and R.
Dickman
, ApJ
341
, 857
–866
(1989
).27.
B.
Turner
, K.
Chan
, S.
Green
, and D.
Lubowich
, ApJ
399
, 114
–133
(1992
).28.
29.
J.
Martín-Pintado
, P.
de Vicente
, N.
Rodŕıguez-Fernández
, A.
Fuente
, and P.
Planesas
, A&A
356
, L5
–L8
(2000
).30.
Y.
Minh
, H.
Liu
, Y.
Su
, P.
Hsieh
, S.
Liu
, et al., ApJ
808
, p. 86
(2015
).31.
P.
Schilke
, C.
Walmsley
, G. Pineau des
Forets
, and D.
Flower
, A&A
321
, 293
–304
(1997
).32.
P.
May
, G. Pineau des
Forêts
, D.
Flower
, D.
Field
, N.
Allan
, and J.
Purton
, MNRAS
318
, 809
–816
(2000
).33.
A.
Gusdorf
, S.
Cabrit
, D.
Flower
, and G. Pineau Des
Forêts
, A&A
482
, 809
–829
(2008
).34.
L.
Ziurys
, P.
Friberg
, and W.
Irvine
, ApJ
343
, 201
–207
(1989
).35.
W.
Langer
and A.
Glassgold
, ApJ
352
, 123
–131
(1990
).36.
T.
Hartquist
, A.
Dalgarno
, and M.
Oppenheimer
, ApJ
236
, 182
–188
(1980
).37.
T.
Umemoto
, H.
Mikami
, S.
Yamamoto
, and N.
Hirano
, ApJ
525
, L105
–L108
(1999
).38.
A.
Cheung
, D.
Rank
, C.
Townes
, S.
Knowles
, and W.
Sullivan
, III, ApJ
157
, p. L13
(1969
).39.
Y.
Pihlström
, L.
Sjouwerman
, D.
Frail
, M.
Claussen
, R.
Mesler
, and B.
McEwen
, AJ
147
, p. 73
(2014
).40.
B.
McEwen
, Y.
Pihlström
, and L.
Sjouwerman
, ApJ
826
, p. 189
(2016
).41.
S.
Faúndez
, L.
Bronfman
, G.
Garay
, R.
Chini
, L.-Å.
Nyman
, and J.
May
, A&A
426
, 97
–103
(2004
).42.
S.
Vaupré
, P.
Hily-Blant
, C.
Ceccarelli
, G.
Dubus
, S.
Gabici
, and T.
Montmerle
, A&A
568
, p. A50
(2014
).43.
M.
Sato
, Y.
Wu
, B.
Zhang
, A.
Sanna
, M.
Reid
, et al., ApJ
793
, 72
–87
(2014
).44.
E.
Hampton
, G.
Rowell
, W.
Hofmann
, D.
Horns
, Y.
Uchiyama
, and S.
Wagner
, JHEAp
11
, 1
–19
(2016
).45.
T.
Joubert
, D.
Castro
, P.
Slane
, and J.
Gelfand
, ApJ
816
, p. 63
(2016
).46.
W.
Reach
, J.
Rho
, and T.
Jarrett
, ApJ
618
, 297
–320
(2005
).47.
A.
Abdo
et al., ApJ
718
, 348
–356
(2010
).48.
Y.
Hanabata
, H.
Katagiri
, J.
Hewitt
, J.
Ballet
, Y.
Fukazawa
, et al., ApJ
786
, p. 145
(2014
).49.
50.
S.
Gabici
, S.
Casanova
, F.
Aharonian
, and G.
Rowell
, “Constraints on the cosmic ray di↵usion coefficient in the W28 region from gamma-ray observations
,” in SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
, edited by S.
Boissier
, M.
Heydari-Malayeri
, R.
Samadi
, and D.
Valls-Gabaud
(2010
) p. 313
.51.
L.
Nava
and S.
Gabici
, MNRAS
429
, 1643
–1651
(2013
).52.
B.
Acharya
, M.
Actis
, T.
Aghajani
, G.
Agnetta
, J.
Aguilar
, et al., Astroparticle Physics
43
, 3
–18
(2013
).
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