H3O+ line emission from starbursts and AGNs

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Search: onr:"swepub:oai:research.chalmers.se:f1561749-628a-4493-9985-05e1a81896c5" > H3O+ line emission ...

1 of 1
Previous record
Next record
To hitlist

Details
MARC

Aalto, Susanne,1964Chalmers tekniska högskola,Chalmers University of Technology (author)

H3O+ line emission from starbursts and AGNs

Article/chapterEnglish2011

Publisher, publication year, extent ...

2011-01-26
EDP Sciences,2011
electronicrdacarrier

Numbers

LIBRIS-ID:oai:research.chalmers.se:f1561749-628a-4493-9985-05e1a81896c5
https://research.chalmers.se/publication/139052URI
https://research.chalmers.se/publication/509621URI
https://doi.org/10.1051/0004-6361/201015878DOI

Supplementary language notes

Language:English
Summary in:English

Part of subdatabase

SwePubSwePub

Classification

Subject category:art swepub-publicationtype
Subject category:ref swepub-contenttype

Notes

Context. The H3O+ molecule probes the chemistry and the ionization rate of dense circumnuclear gas in galaxies. Aims. We use the H3O+ molecule to investigate the impact of starburst and AGN activity on the chemistry of the molecular interstellar medium. Methods. Using the JCMT, we have observed the 3(2)(+)-2(2)(-) 364 GHz line of p-H3O+ towards the centres of seven active galaxies. Results. We have detected p-H3O+ towards IC 342, NGC 253, NGC 1068, NGC 4418, and NGC 6240. Upper limits were obtained for IRAS 15250 and Arp 299. We find large H3O+ abundances (N(H3O+)/N(H-2) greater than or similar to 10(-8)) in all detected galaxies apart from in IC 342 where it is about one order of magnitude lower. We note, however, that uncertainties in N(H3O+) may be significant due to lack of definite information on source size and excitation. We furthermore compare the derived N(H3O+) with N(HCO+) and find that the H3O+ to HCO+ column density ratio is large in NGC 1068 ( 24), moderate in NGC 4418 and NGC 253 ( 4-5), slightly less than unity in NGC 6240 ( 0.7) and lowest in IC 342 ( 0.2-0.6). We compare our results with models of X-ray and photon dominated regions ( XDRs and PDRs). Conclusions. For IC 342 we find that a starburst PDR chemistry can explain the observed H3O+ abundance. For the other galaxies, the large H3O+ columns are generally consistent with XDR models. In particular for NGC 1068 the elevated N(H3O+)/N(HCO+) ratio suggests a low column density XDR. For NGC 4418 however, large HC3N abundances are inconsistent with the XDR interpretation. An alternative possibility is that H3O+ forms through H2O evaporating off dust grains and reacting with HCO+ in warm, dense gas. This scenario could also potentially fit the results for NGC 253. Further studies of the excitation and distribution of H3O+-aswell as Herschel observations of water abundances - will help to further constrain the models.

Subject headings and genre

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
nucleus
ultraluminous infrared galaxies
dense molecular gas
galaxies: evolution
young stellar objects
ngc 1068
active galactic
ISM: molecules
star-formation
nearby galaxies
galaxies: active
high-spatial-resolution
ic 342
galaxies: starburst
radio
x-ray
lines: galaxies

Added entries (persons, corporate bodies, meetings, titles ...)

Costagliola, Francesco,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)costagli (author)
van der Tak, F. F. S.Rijksuniversiteit Groningen,University of Groningen (author)
Meijerink, R.Universiteit Leiden (UL),Leiden University (UL) (author)
Chalmers tekniska högskolaRijksuniversiteit Groningen (creator_code:org_t)

Related titles

In:Astronomy and Astrophysics: EDP Sciences527:80004-63611432-0746

Internet link

Find in a library

Astronomy and Astrophysics (Search for host publication in LIBRIS)

To the university's database

1 of 1
Previous record
Next record
To hitlist

Find more in SwePub

By the author/editor: Aalto, Susanne, ...; Costagliola, Fra ...; van der Tak, F. ...; Meijerink, R.

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

Articles in the publication: Astronomy and As ...

By the university: Chalmers University of Technology

Search outside SwePub

Extend your search to:: Google; Google Book Search; Google Scholar

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

LIBRIS.kb.se