File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Searches for pulsar-like candidates from unidentified objects in the Third Catalog of Hard Fermi-LAT Sources with machine learning techniques

TitleSearches for pulsar-like candidates from unidentified objects in the Third Catalog of Hard Fermi-LAT Sources with machine learning techniques
Authors
KeywordsPulsars: general
Gamma-rays: stars
X-rays: binaries
X-rays: stars
Issue Date2020
PublisherOxford University press, co-published with Royal Astronomical Society. The Journal's web site is located at http://www.oxfordjournals.org/our_journals/mnras/
Citation
Monthly Notices of the Royal Astronomical Society, 2020, v. 495 n. 1, p. 1093-1109 How to Cite?
AbstractWe report the results of searching pulsar-like candidates from the unidentified objects in the Third Catalog of Hard Fermi-LAT Sources (3FHL). Using a machine-learning-based classification scheme with a nominal accuracy of ∼98percent⁠, we have selected 27 pulsar-like objects from 200 unidentified 3FHL sources for an identification campaign. Using archival data, X-ray sources are found within the γ-ray error ellipses of 10 3FHL pulsar-like candidates. Within the error circles of the much better constrained X-ray positions, we have also searched for the optical/infrared counterparts and examined their spectral energy distributions. Among our shortlisted candidates, the most secure identification is the association of 3FHL J1823.3–1339 and its X-ray counterpart with the globular cluster Mercer 5. The γ-rays from the source can be contributed by a population of millisecond pulsars residing in the cluster. This makes Mercer 5 as one of the slowly growing hard γ-ray population of globular clusters with emission >10 GeV. Very recently, another candidate picked by our classification scheme, 3FHL J1405.1–6118, has been identified as a new γ-ray binary with an orbital period of 13.7 d. Our X-ray analysis with a short Chandra observation has found a possible periodic signal candidate of ∼1.4 h and a putative extended X-ray tail of ∼20 arcsec long. Spectral energy distribution of its optical/infrared counterpart conforms with a blackbody of Tbb ∼ 40 000 K and Rbb ∼ 12 R⊙ at a distance of 7.7 kpc. This is consistent with its identification as an early O star as found by infrared spectroscopy.
Persistent Identifierhttp://hdl.handle.net/10722/286300
ISSN
2020 Impact Factor: 5.287
2015 SCImago Journal Rankings: 2.806
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHui, CY-
dc.contributor.authorLee, J-
dc.contributor.authorLi, KL-
dc.contributor.authorKim, S-
dc.contributor.authorOh, K-
dc.contributor.authorLuo, S-
dc.contributor.authorLeung, AP-
dc.contributor.authorKong, AKH-
dc.contributor.authorTakata, J-
dc.contributor.authorCheng, KS-
dc.date.accessioned2020-08-31T07:01:58Z-
dc.date.available2020-08-31T07:01:58Z-
dc.date.issued2020-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2020, v. 495 n. 1, p. 1093-1109-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/286300-
dc.description.abstractWe report the results of searching pulsar-like candidates from the unidentified objects in the Third Catalog of Hard Fermi-LAT Sources (3FHL). Using a machine-learning-based classification scheme with a nominal accuracy of ∼98percent⁠, we have selected 27 pulsar-like objects from 200 unidentified 3FHL sources for an identification campaign. Using archival data, X-ray sources are found within the γ-ray error ellipses of 10 3FHL pulsar-like candidates. Within the error circles of the much better constrained X-ray positions, we have also searched for the optical/infrared counterparts and examined their spectral energy distributions. Among our shortlisted candidates, the most secure identification is the association of 3FHL J1823.3–1339 and its X-ray counterpart with the globular cluster Mercer 5. The γ-rays from the source can be contributed by a population of millisecond pulsars residing in the cluster. This makes Mercer 5 as one of the slowly growing hard γ-ray population of globular clusters with emission >10 GeV. Very recently, another candidate picked by our classification scheme, 3FHL J1405.1–6118, has been identified as a new γ-ray binary with an orbital period of 13.7 d. Our X-ray analysis with a short Chandra observation has found a possible periodic signal candidate of ∼1.4 h and a putative extended X-ray tail of ∼20 arcsec long. Spectral energy distribution of its optical/infrared counterpart conforms with a blackbody of Tbb ∼ 40 000 K and Rbb ∼ 12 R⊙ at a distance of 7.7 kpc. This is consistent with its identification as an early O star as found by infrared spectroscopy.-
dc.languageeng-
dc.publisherOxford University press, co-published with Royal Astronomical Society. The Journal's web site is located at http://www.oxfordjournals.org/our_journals/mnras/-
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society-
dc.rightsThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.-
dc.subjectPulsars: general-
dc.subjectGamma-rays: stars-
dc.subjectX-rays: binaries-
dc.subjectX-rays: stars-
dc.titleSearches for pulsar-like candidates from unidentified objects in the Third Catalog of Hard Fermi-LAT Sources with machine learning techniques-
dc.typeArticle-
dc.identifier.authorityCheng, KS=rp00675-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1093/mnras/staa1113-
dc.identifier.hkuros313347-
dc.identifier.volume495-
dc.identifier.issue1-
dc.identifier.spage1093-
dc.identifier.epage1109-
dc.identifier.isiWOS:000539101400082-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl0035-8711-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats