NAOC Open IR
An Optical Overview of Blazars with LAMOST. II. Gamma-Ray Blazar Candidates and Updated Classifications
Pena-Herazo, Harold A.1,2; Massaro, Francesco1,3,4,5; Gu, Minfeng6; Paggi, Alessandro1,3,4; Landoni, Marco7,8; D'Abrusco, Raffaele9; Ricci, Federica10,11; Masetti, Nicola11,12; Chavushyan, Vahram2
2021-08-01
Source PublicationASTRONOMICAL JOURNAL
ISSN0004-6256
Volume162Issue:2Pages:9
AbstractBlazars represent the dominant class of associated gamma-ray sources detected by the Fermi Large Area Telescope (LAT). However, in the more recent release of the Fourth Fermi-LAT Point Source Catalog (4FGL), similar to 25% of the sources associated with lower-energy counterparts show a multifrequency behavior similar to that of blazars, but lacks an optical spectroscopic confirmation of their nature and are therefore classified as Blazar Candidates of Uncertain Type (BCUs). A particularly challenging task in blazar studies is to classify these BCUs and, when possible to estimate their redshifts, in particular for BL Lac objects, characterized by almost featureless optical spectra with only weak emission lines. Continuing our study of blazars with Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) optical spectral data, we perform an extensive search for optical spectra available in the LAMOST Data Release 6 archive. Our aim is confirming the blazar nature of BCUs and to test if new data can allow us to get a redshift estimate for BL Lac objects that lack measurement, as well as to search for and discover changing-look blazars. We selected sources out of the 4FGL catalog, the list of targets from our follow-up spectroscopic campaign of unidentified and/or unassociated gamma-ray sources, and the Roma-BZCAT multifrequency catalog of blazars, finding a total of 42 sources with available LAMOST DR6 spectra. We confirmed the blazar-like nature of four blazar candidates . For the remaining 37 sources we confirm their previous classification.
Funding OrganizationCONACyT ; CONACyT ; National Science Foundation of China ; National Science Foundation of China ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; Ministry of Education, Universities, and Research ; Ministry of Education, Universities, and Research ; Consorzio Interuniversitario per la fisica Spaziale ; Consorzio Interuniversitario per la fisica Spaziale ; National Development and Reform Commission ; National Development and Reform Commission ; CONACyT ; CONACyT ; National Science Foundation of China ; National Science Foundation of China ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; Ministry of Education, Universities, and Research ; Ministry of Education, Universities, and Research ; Consorzio Interuniversitario per la fisica Spaziale ; Consorzio Interuniversitario per la fisica Spaziale ; National Development and Reform Commission ; National Development and Reform Commission ; CONACyT ; CONACyT ; National Science Foundation of China ; National Science Foundation of China ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; Ministry of Education, Universities, and Research ; Ministry of Education, Universities, and Research ; Consorzio Interuniversitario per la fisica Spaziale ; Consorzio Interuniversitario per la fisica Spaziale ; National Development and Reform Commission ; National Development and Reform Commission ; CONACyT ; CONACyT ; National Science Foundation of China ; National Science Foundation of China ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; Ministry of Education, Universities, and Research ; Ministry of Education, Universities, and Research ; Consorzio Interuniversitario per la fisica Spaziale ; Consorzio Interuniversitario per la fisica Spaziale ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.3847/1538-3881/ac09e2
WOS KeywordLARGE-AREA TELESCOPE ; FLARE-LIKE VARIABILITY ; BL LACERTAE OBJECTS ; X-RAY ; SPECTROSCOPIC OBSERVATIONS ; ENERGY-DISTRIBUTION ; EMISSION-LINE ; DATA RELEASE ; SKY SURVEY ; FERMI
Language英语
Funding ProjectCONACyT[280789] ; National Science Foundation of China[11873073] ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research[232/2016] ; Ministry of Education, Universities, and Research[MASF_FFABR_17_01] ; Consorzio Interuniversitario per la fisica Spaziale[MASF_CONTR_FIN_18_02] ; National Development and Reform Commission
Funding OrganizationCONACyT ; CONACyT ; National Science Foundation of China ; National Science Foundation of China ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; Ministry of Education, Universities, and Research ; Ministry of Education, Universities, and Research ; Consorzio Interuniversitario per la fisica Spaziale ; Consorzio Interuniversitario per la fisica Spaziale ; National Development and Reform Commission ; National Development and Reform Commission ; CONACyT ; CONACyT ; National Science Foundation of China ; National Science Foundation of China ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; Ministry of Education, Universities, and Research ; Ministry of Education, Universities, and Research ; Consorzio Interuniversitario per la fisica Spaziale ; Consorzio Interuniversitario per la fisica Spaziale ; National Development and Reform Commission ; National Development and Reform Commission ; CONACyT ; CONACyT ; National Science Foundation of China ; National Science Foundation of China ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; Ministry of Education, Universities, and Research ; Ministry of Education, Universities, and Research ; Consorzio Interuniversitario per la fisica Spaziale ; Consorzio Interuniversitario per la fisica Spaziale ; National Development and Reform Commission ; National Development and Reform Commission ; CONACyT ; CONACyT ; National Science Foundation of China ; National Science Foundation of China ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University, and Research ; Ministry of Education, Universities, and Research ; Ministry of Education, Universities, and Research ; Consorzio Interuniversitario per la fisica Spaziale ; Consorzio Interuniversitario per la fisica Spaziale ; National Development and Reform Commission ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000679097400001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/76538
Collection中国科学院国家天文台
Corresponding AuthorPena-Herazo, Harold A.
Affiliation1.Univ Turin, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy
2.Inst Nacl Astrofis Opt & Electr, Apartado Postal 51-216, Puebla 72000, Mexico
3.Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
4.INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy
5.Consorzio Interuniv Fis Spaziale CIFS, Via Pietro Giuria 1, I-10125 Turin, Italy
6.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
7.INAF Osservatorio Astron Cagliari, Via Sci 5, Cagliari, Italy
8.INAF Osservatorio Astron Brera, Via Emilio Bianchi 46, I-23807 Merate, Italy
9.Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
10.Univ Bologna, Dipartimento Fis & Astron, Via P Gobetti 93-2, I-40129 Bologna, Italy
11.INAF Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy
12.Univ Andres Bello, Dept Ciencias Fis, Fernandez Concha 700, Santiago, Chile
Recommended Citation
GB/T 7714
Pena-Herazo, Harold A.,Massaro, Francesco,Gu, Minfeng,et al. An Optical Overview of Blazars with LAMOST. II. Gamma-Ray Blazar Candidates and Updated Classifications[J]. ASTRONOMICAL JOURNAL,2021,162(2):9.
APA Pena-Herazo, Harold A..,Massaro, Francesco.,Gu, Minfeng.,Paggi, Alessandro.,Landoni, Marco.,...&Chavushyan, Vahram.(2021).An Optical Overview of Blazars with LAMOST. II. Gamma-Ray Blazar Candidates and Updated Classifications.ASTRONOMICAL JOURNAL,162(2),9.
MLA Pena-Herazo, Harold A.,et al."An Optical Overview of Blazars with LAMOST. II. Gamma-Ray Blazar Candidates and Updated Classifications".ASTRONOMICAL JOURNAL 162.2(2021):9.
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