File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: High-resolution X-ray imaging of the center of IC 342

TitleHigh-resolution X-ray imaging of the center of IC 342
Authors
KeywordsGalaxies: individual (IC 342)
Galaxies: starburst
X-rays: galaxies
Issue Date2008
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2008, v. 686 n. 2, p. 995-1006 How to Cite?
AbstractWe present the results of a high-resolution (θFWHM ∼0.5″) 12 ks Chandra HRC-I observation of the starburst galaxy IC 342 taken on 2006 April 2. We identify 23 X-ray sources within the central 30′ x 30′ region of IC 342 and resolve the historical ultraluminous X-ray source (ULX), X3, near the nucleus into two sources, namely, C12 and C13. The brighter source C12, with L0.08-10 keV = (6.66 ± 0.45) × 1038 erg s-1, is spatially extended (≈82 pc x 127 pc). From the astrometric registration of the X-ray image, C12 is at R:A: = 03 h46m48.43s, decl. = +68°05′47. 45″, and is closer to the nucleus than C13. Thus, we conclude that source is not an ULX and must instead be associated with the nucleus. The fainter source C13, with L0.08-10 keV = (5.1 ± 1.4) × 10 37 erg s-1, is consistent with a point source located at 6.51″ (position angle P.A. ≈ 240°) of C12. We also analyzed astrometrically corrected optical Hubble Space Telescope (HST ) and radio Very Large Array images; a comparison with the X-ray image showed similarities in their morphologies. Regions of star formation within the central region of IC 342 are clearly visible in the HST Hα image, which contains three optical star clusters and our detected X-ray source C12. We find that the observed X-ray luminosity of C12 is very close to the predicted X-ray emission from a starburst, suggesting that the nuclear X-ray emission of IC 342 is dominated by a starburst. Furthermore, we discuss the possibility of active galactic nucleus (AGN) emission in the nucleus of IC 342, which we can neither prove nor discard with our data. © 2008. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/55596
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
Funding AgencyGrant Number
National Aeronautics and Space Administration through Chandra awardG06-7110X
NAS8-03060
National Science Council, TaiwanNSC96-2112-M-007-037-MY3
Funding Information:

We thank L. Sjouwerman and C.-W. Tsai for generously providing the radio maps and for helpful discussions. This work is based on observations obtained with Chandra. Support for this work was provided by the National Aeronautics and Space Administration through Chandra award G06-7110X issued by the Chandra X-Ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8-03060. S. Y. Mak acknowledges support from HKU under a Postgraduate Studentship grant. C.S.J. Pun acknowledges support of a RGC grant from the government of the HongKong SAR. A. K. H. Kong acknowledges support from the National Science Council, Taiwan, through grant NSC96-2112-M-007-037-MY3.

References

 

DC FieldValueLanguage
dc.contributor.authorMak, DSYen_HK
dc.contributor.authorPun, CSJen_HK
dc.contributor.authorKong, AKHen_HK
dc.date.accessioned2009-10-07T05:17:02Z-
dc.date.available2009-10-07T05:17:02Z-
dc.date.issued2008en_HK
dc.identifier.citationAstrophysical Journal Letters, 2008, v. 686 n. 2, p. 995-1006en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/55596-
dc.description.abstractWe present the results of a high-resolution (θFWHM ∼0.5″) 12 ks Chandra HRC-I observation of the starburst galaxy IC 342 taken on 2006 April 2. We identify 23 X-ray sources within the central 30′ x 30′ region of IC 342 and resolve the historical ultraluminous X-ray source (ULX), X3, near the nucleus into two sources, namely, C12 and C13. The brighter source C12, with L0.08-10 keV = (6.66 ± 0.45) × 1038 erg s-1, is spatially extended (≈82 pc x 127 pc). From the astrometric registration of the X-ray image, C12 is at R:A: = 03 h46m48.43s, decl. = +68°05′47. 45″, and is closer to the nucleus than C13. Thus, we conclude that source is not an ULX and must instead be associated with the nucleus. The fainter source C13, with L0.08-10 keV = (5.1 ± 1.4) × 10 37 erg s-1, is consistent with a point source located at 6.51″ (position angle P.A. ≈ 240°) of C12. We also analyzed astrometrically corrected optical Hubble Space Telescope (HST ) and radio Very Large Array images; a comparison with the X-ray image showed similarities in their morphologies. Regions of star formation within the central region of IC 342 are clearly visible in the HST Hα image, which contains three optical star clusters and our detected X-ray source C12. We find that the observed X-ray luminosity of C12 is very close to the predicted X-ray emission from a starburst, suggesting that the nuclear X-ray emission of IC 342 is dominated by a starburst. Furthermore, we discuss the possibility of active galactic nucleus (AGN) emission in the nucleus of IC 342, which we can neither prove nor discard with our data. © 2008. The American Astronomical Society. All rights reserved.en_HK
dc.language.isoengen
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectGalaxies: individual (IC 342)en_HK
dc.subjectGalaxies: starbursten_HK
dc.subjectX-rays: galaxiesen_HK
dc.titleHigh-resolution X-ray imaging of the center of IC 342en_HK
dc.typeArticleen_HK
dc.identifier.emailPun, CSJ: jcspun@hkucc.hku.hken_HK
dc.identifier.authorityPun, CSJ=rp00772en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1086/591023en_HK
dc.identifier.scopuseid_2-s2.0-54249145679en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-54249145679&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume686en_HK
dc.identifier.issue2en_HK
dc.identifier.spage995en_HK
dc.identifier.epage1006en_HK
dc.identifier.isiWOS:000260370500018-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridMak, DSY=23967776400en_HK
dc.identifier.scopusauthoridPun, CSJ=7003931846en_HK
dc.identifier.scopusauthoridKong, AKH=35185316600en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats