The first blazar observed at z > 6
We present the discovery of PSO J030947.49+271757.31, the radio brightest (23.7 mJy at 1.4 GHz) active galactic nucleus (AGN) at z > 6.0. It was selected by cross-matching the NRAO VLA Sky Survey and the Panoramic Survey Telescope and Rapid Response System PS1 databases and its high- z nature w...
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| Veröffentlicht in: | Astronomy and astrophysics (Berlin) 2020-03, Vol.635, p.L7 |
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| creator | Belladitta, S. Moretti, A. Caccianiga, A. Spingola, C. Severgnini, P. Della Ceca, R. Ghisellini, G. Dallacasa, D. Sbarrato, T. Cicone, C. Cassarà, L. P. Pedani, M. |
| description | We present the discovery of PSO J030947.49+271757.31, the radio brightest (23.7 mJy at 1.4 GHz) active galactic nucleus (AGN) at
z
> 6.0. It was selected by cross-matching the NRAO VLA Sky Survey and the Panoramic Survey Telescope and Rapid Response System PS1 databases and its high-
z
nature was confirmed by a dedicated spectroscopic observation at the Large Binocular Telescope. A pointed
Neil Gehrels Swift
Observatory XRT observation allowed us to measure a flux of ∼3.4 × 10
−14
erg s
−1
cm
−2
in the [0.5–10] keV energy band, which also makes this object the X-ray brightest AGN ever observed at
z
> 6.0. Its flat radio spectrum (
α
νr
< 0.5), very high radio loudness (
R
> 10
3
), and strong X-ray emission, compared to the optical, support the hypothesis of the blazar nature of this source. Assuming that this is the only blazar at this redshift in the surveyed area of sky, we derive a space density of blazars at
z
∼ 6 and with
M
1450 Å
< −25.1 of 5.5
+11.2
−4.6
× 10
−3
Gpc
−3
. From this number, and assuming a reasonable value of the bulk velocity of the jet (Γ = 10), we can also infer a space density of the entire radio-loud AGN population at
z
∼ 6 with the same optical/UV absolute magnitude of 1.10
+2.53
−0.91
Gpc
−3
. Larger samples of blazars will be necessary to better constrain these estimates. |
| doi_str_mv | 10.1051/0004-6361/201937395 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_crist</sourceid><recordid>TN_cdi_cristin_nora_10852_78290</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2487116022</sourcerecordid><originalsourceid>FETCH-LOGICAL-c412t-a1ac98f07842ceb95ee93465063fa98f3395edc89f248e0eb0155c2ac4b600d03</originalsourceid><addsrcrecordid>eNo9kE1LAzEQQIMoWKu_wINBz2tn8rXJRZBSP6DgpZ5DNpvFLXW3JlvB_nqzVHsahnk8hkfINcI9gsQZAIhCcYUzBmh4yY08IRMUnBVQCnVKJkfinFyktM4rQ80n5Hb1EWjTxjTQauP2LtK-SiF-h5q6ge7pA1WX5KxxmxSu_uaUvD8tVvOXYvn2_Dp_XBZeIBsKh84b3UCpBfOhMjIEw4WSoHjj8oHnp0LttWmY0AFCBSilZ86LSgHUwKfk5uD1sU1D29muj84iaMlsqZkZibsDsY391y6kwa77XezyUzY7S0QFjGWK_3v6lGJo7Da2ny7-ZJcdc9kxhh1j2GMu_gvjplgW</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2487116022</pqid></control><display><type>article</type><title>The first blazar observed at z > 6</title><source>Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX</source><source>EDP Sciences</source><source>NORA - Norwegian Open Research Archives</source><source>Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals</source><creator>Belladitta, S. ; Moretti, A. ; Caccianiga, A. ; Spingola, C. ; Severgnini, P. ; Della Ceca, R. ; Ghisellini, G. ; Dallacasa, D. ; Sbarrato, T. ; Cicone, C. ; Cassarà, L. P. ; Pedani, M.</creator><creatorcontrib>Belladitta, S. ; Moretti, A. ; Caccianiga, A. ; Spingola, C. ; Severgnini, P. ; Della Ceca, R. ; Ghisellini, G. ; Dallacasa, D. ; Sbarrato, T. ; Cicone, C. ; Cassarà, L. P. ; Pedani, M.</creatorcontrib><description>We present the discovery of PSO J030947.49+271757.31, the radio brightest (23.7 mJy at 1.4 GHz) active galactic nucleus (AGN) at
z
> 6.0. It was selected by cross-matching the NRAO VLA Sky Survey and the Panoramic Survey Telescope and Rapid Response System PS1 databases and its high-
z
nature was confirmed by a dedicated spectroscopic observation at the Large Binocular Telescope. A pointed
Neil Gehrels Swift
Observatory XRT observation allowed us to measure a flux of ∼3.4 × 10
−14
erg s
−1
cm
−2
in the [0.5–10] keV energy band, which also makes this object the X-ray brightest AGN ever observed at
z
> 6.0. Its flat radio spectrum (
α
νr
< 0.5), very high radio loudness (
R
> 10
3
), and strong X-ray emission, compared to the optical, support the hypothesis of the blazar nature of this source. Assuming that this is the only blazar at this redshift in the surveyed area of sky, we derive a space density of blazars at
z
∼ 6 and with
M
1450 Å
< −25.1 of 5.5
+11.2
−4.6
× 10
−3
Gpc
−3
. From this number, and assuming a reasonable value of the bulk velocity of the jet (Γ = 10), we can also infer a space density of the entire radio-loud AGN population at
z
∼ 6 with the same optical/UV absolute magnitude of 1.10
+2.53
−0.91
Gpc
−3
. Larger samples of blazars will be necessary to better constrain these estimates.</description><identifier>ISSN: 0004-6361</identifier><identifier>EISSN: 1432-0746</identifier><identifier>DOI: 10.1051/0004-6361/201937395</identifier><language>eng</language><publisher>Heidelberg: EDP Sciences</publisher><ispartof>Astronomy and astrophysics (Berlin), 2020-03, Vol.635, p.L7</ispartof><rights>Copyright EDP Sciences Mar 2020</rights><rights>info:eu-repo/semantics/openAccess</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c412t-a1ac98f07842ceb95ee93465063fa98f3395edc89f248e0eb0155c2ac4b600d03</citedby><cites>FETCH-LOGICAL-c412t-a1ac98f07842ceb95ee93465063fa98f3395edc89f248e0eb0155c2ac4b600d03</cites><orcidid>0000-0003-4747-4484</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,3714,26544,27901,27902</link.rule.ids></links><search><creatorcontrib>Belladitta, S.</creatorcontrib><creatorcontrib>Moretti, A.</creatorcontrib><creatorcontrib>Caccianiga, A.</creatorcontrib><creatorcontrib>Spingola, C.</creatorcontrib><creatorcontrib>Severgnini, P.</creatorcontrib><creatorcontrib>Della Ceca, R.</creatorcontrib><creatorcontrib>Ghisellini, G.</creatorcontrib><creatorcontrib>Dallacasa, D.</creatorcontrib><creatorcontrib>Sbarrato, T.</creatorcontrib><creatorcontrib>Cicone, C.</creatorcontrib><creatorcontrib>Cassarà, L. P.</creatorcontrib><creatorcontrib>Pedani, M.</creatorcontrib><title>The first blazar observed at z > 6</title><title>Astronomy and astrophysics (Berlin)</title><description>We present the discovery of PSO J030947.49+271757.31, the radio brightest (23.7 mJy at 1.4 GHz) active galactic nucleus (AGN) at
z
> 6.0. It was selected by cross-matching the NRAO VLA Sky Survey and the Panoramic Survey Telescope and Rapid Response System PS1 databases and its high-
z
nature was confirmed by a dedicated spectroscopic observation at the Large Binocular Telescope. A pointed
Neil Gehrels Swift
Observatory XRT observation allowed us to measure a flux of ∼3.4 × 10
−14
erg s
−1
cm
−2
in the [0.5–10] keV energy band, which also makes this object the X-ray brightest AGN ever observed at
z
> 6.0. Its flat radio spectrum (
α
νr
< 0.5), very high radio loudness (
R
> 10
3
), and strong X-ray emission, compared to the optical, support the hypothesis of the blazar nature of this source. Assuming that this is the only blazar at this redshift in the surveyed area of sky, we derive a space density of blazars at
z
∼ 6 and with
M
1450 Å
< −25.1 of 5.5
+11.2
−4.6
× 10
−3
Gpc
−3
. From this number, and assuming a reasonable value of the bulk velocity of the jet (Γ = 10), we can also infer a space density of the entire radio-loud AGN population at
z
∼ 6 with the same optical/UV absolute magnitude of 1.10
+2.53
−0.91
Gpc
−3
. Larger samples of blazars will be necessary to better constrain these estimates.</description><issn>0004-6361</issn><issn>1432-0746</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>3HK</sourceid><recordid>eNo9kE1LAzEQQIMoWKu_wINBz2tn8rXJRZBSP6DgpZ5DNpvFLXW3JlvB_nqzVHsahnk8hkfINcI9gsQZAIhCcYUzBmh4yY08IRMUnBVQCnVKJkfinFyktM4rQ80n5Hb1EWjTxjTQauP2LtK-SiF-h5q6ge7pA1WX5KxxmxSu_uaUvD8tVvOXYvn2_Dp_XBZeIBsKh84b3UCpBfOhMjIEw4WSoHjj8oHnp0LttWmY0AFCBSilZ86LSgHUwKfk5uD1sU1D29muj84iaMlsqZkZibsDsY391y6kwa77XezyUzY7S0QFjGWK_3v6lGJo7Da2ny7-ZJcdc9kxhh1j2GMu_gvjplgW</recordid><startdate>20200301</startdate><enddate>20200301</enddate><creator>Belladitta, S.</creator><creator>Moretti, A.</creator><creator>Caccianiga, A.</creator><creator>Spingola, C.</creator><creator>Severgnini, P.</creator><creator>Della Ceca, R.</creator><creator>Ghisellini, G.</creator><creator>Dallacasa, D.</creator><creator>Sbarrato, T.</creator><creator>Cicone, C.</creator><creator>Cassarà, L. P.</creator><creator>Pedani, M.</creator><general>EDP Sciences</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>3HK</scope><orcidid>https://orcid.org/0000-0003-4747-4484</orcidid></search><sort><creationdate>20200301</creationdate><title>The first blazar observed at z > 6</title><author>Belladitta, S. ; Moretti, A. ; Caccianiga, A. ; Spingola, C. ; Severgnini, P. ; Della Ceca, R. ; Ghisellini, G. ; Dallacasa, D. ; Sbarrato, T. ; Cicone, C. ; Cassarà, L. P. ; Pedani, M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c412t-a1ac98f07842ceb95ee93465063fa98f3395edc89f248e0eb0155c2ac4b600d03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Belladitta, S.</creatorcontrib><creatorcontrib>Moretti, A.</creatorcontrib><creatorcontrib>Caccianiga, A.</creatorcontrib><creatorcontrib>Spingola, C.</creatorcontrib><creatorcontrib>Severgnini, P.</creatorcontrib><creatorcontrib>Della Ceca, R.</creatorcontrib><creatorcontrib>Ghisellini, G.</creatorcontrib><creatorcontrib>Dallacasa, D.</creatorcontrib><creatorcontrib>Sbarrato, T.</creatorcontrib><creatorcontrib>Cicone, C.</creatorcontrib><creatorcontrib>Cassarà, L. P.</creatorcontrib><creatorcontrib>Pedani, M.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>NORA - Norwegian Open Research Archives</collection><jtitle>Astronomy and astrophysics (Berlin)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Belladitta, S.</au><au>Moretti, A.</au><au>Caccianiga, A.</au><au>Spingola, C.</au><au>Severgnini, P.</au><au>Della Ceca, R.</au><au>Ghisellini, G.</au><au>Dallacasa, D.</au><au>Sbarrato, T.</au><au>Cicone, C.</au><au>Cassarà, L. P.</au><au>Pedani, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The first blazar observed at z > 6</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><date>2020-03-01</date><risdate>2020</risdate><volume>635</volume><spage>L7</spage><pages>L7-</pages><issn>0004-6361</issn><eissn>1432-0746</eissn><abstract>We present the discovery of PSO J030947.49+271757.31, the radio brightest (23.7 mJy at 1.4 GHz) active galactic nucleus (AGN) at
z
> 6.0. It was selected by cross-matching the NRAO VLA Sky Survey and the Panoramic Survey Telescope and Rapid Response System PS1 databases and its high-
z
nature was confirmed by a dedicated spectroscopic observation at the Large Binocular Telescope. A pointed
Neil Gehrels Swift
Observatory XRT observation allowed us to measure a flux of ∼3.4 × 10
−14
erg s
−1
cm
−2
in the [0.5–10] keV energy band, which also makes this object the X-ray brightest AGN ever observed at
z
> 6.0. Its flat radio spectrum (
α
νr
< 0.5), very high radio loudness (
R
> 10
3
), and strong X-ray emission, compared to the optical, support the hypothesis of the blazar nature of this source. Assuming that this is the only blazar at this redshift in the surveyed area of sky, we derive a space density of blazars at
z
∼ 6 and with
M
1450 Å
< −25.1 of 5.5
+11.2
−4.6
× 10
−3
Gpc
−3
. From this number, and assuming a reasonable value of the bulk velocity of the jet (Γ = 10), we can also infer a space density of the entire radio-loud AGN population at
z
∼ 6 with the same optical/UV absolute magnitude of 1.10
+2.53
−0.91
Gpc
−3
. Larger samples of blazars will be necessary to better constrain these estimates.</abstract><cop>Heidelberg</cop><pub>EDP Sciences</pub><doi>10.1051/0004-6361/201937395</doi><orcidid>https://orcid.org/0000-0003-4747-4484</orcidid><oa>free_for_read</oa></addata></record> |
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| source | Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; EDP Sciences; NORA - Norwegian Open Research Archives; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| title | The first blazar observed at z > 6 |
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