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Low energy γ-ray observation of NGC4151
OBSERVATIONS of the Seyfert galaxy NGC4151 by Ariel V, OSOI VII and UCSD (refs 1–3 respectively) have demonstrated that it has a relatively flat X-ray spectrum up to photon energies greater than 100 keV. The X-ray luminosity of this object is of the order of 4 × 10 43 erg s −1 if a distance of 20 Mp...
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| Published in: | Nature (London) 1977-01, Vol.270 (5635), p.319-320 |
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| Main Authors: | , , , , , , , , , |
| Format: | Article |
| Language: | English |
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| cites | cdi_FETCH-LOGICAL-c261t-a214eb4b5d40b86335677ace0353319e6248174fedd45f0ac033d6daec1456d33 |
| container_end_page | 320 |
| container_issue | 5635 |
| container_start_page | 319 |
| container_title | Nature (London) |
| container_volume | 270 |
| creator | DI COCCO, G. BOELLA, G. PEROTTI, F. STIGLITZ, R. VILLA, G. BAKER, R. E. BUTLER, R. C. DEAN, A. J. MARTIN, S. J. RAMSDEN, D. |
| description | OBSERVATIONS of the Seyfert galaxy NGC4151 by Ariel V, OSOI VII and UCSD (refs 1–3 respectively) have demonstrated that it has a relatively flat X-ray spectrum up to photon energies greater than 100 keV. The X-ray luminosity of this object is of the order of 4 × 10
43
erg s
−1
if a distance of 20 Mpc is assumed, and exceeds the integrated luminosity at all the other observed greater wavelengths. Long-term observations
4
by Ariel V indicate that the X-ray emission may originate from a compact object with dimensions less than 8 × 10
15
cm, presumably the nucleus of the Galaxy. Here we present the preliminary results of a positive measurement in the low energy γ-ray region of the spectrum, which are in good agreement with the X-ray data and confirm the intense high energy luminosity of the object. |
| doi_str_mv | 10.1038/270319a0 |
| format | article |
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43
erg s
−1
if a distance of 20 Mpc is assumed, and exceeds the integrated luminosity at all the other observed greater wavelengths. Long-term observations
4
by Ariel V indicate that the X-ray emission may originate from a compact object with dimensions less than 8 × 10
15
cm, presumably the nucleus of the Galaxy. Here we present the preliminary results of a positive measurement in the low energy γ-ray region of the spectrum, which are in good agreement with the X-ray data and confirm the intense high energy luminosity of the object.</description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/270319a0</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>Humanities and Social Sciences ; letter ; multidisciplinary ; Science ; Science (multidisciplinary)</subject><ispartof>Nature (London), 1977-01, Vol.270 (5635), p.319-320</ispartof><rights>Springer Nature Limited 1977</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c261t-a214eb4b5d40b86335677ace0353319e6248174fedd45f0ac033d6daec1456d33</citedby><cites>FETCH-LOGICAL-c261t-a214eb4b5d40b86335677ace0353319e6248174fedd45f0ac033d6daec1456d33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>DI COCCO, G.</creatorcontrib><creatorcontrib>BOELLA, G.</creatorcontrib><creatorcontrib>PEROTTI, F.</creatorcontrib><creatorcontrib>STIGLITZ, R.</creatorcontrib><creatorcontrib>VILLA, G.</creatorcontrib><creatorcontrib>BAKER, R. E.</creatorcontrib><creatorcontrib>BUTLER, R. C.</creatorcontrib><creatorcontrib>DEAN, A. J.</creatorcontrib><creatorcontrib>MARTIN, S. J.</creatorcontrib><creatorcontrib>RAMSDEN, D.</creatorcontrib><title>Low energy γ-ray observation of NGC4151</title><title>Nature (London)</title><addtitle>Nature</addtitle><description>OBSERVATIONS of the Seyfert galaxy NGC4151 by Ariel V, OSOI VII and UCSD (refs 1–3 respectively) have demonstrated that it has a relatively flat X-ray spectrum up to photon energies greater than 100 keV. The X-ray luminosity of this object is of the order of 4 × 10
43
erg s
−1
if a distance of 20 Mpc is assumed, and exceeds the integrated luminosity at all the other observed greater wavelengths. Long-term observations
4
by Ariel V indicate that the X-ray emission may originate from a compact object with dimensions less than 8 × 10
15
cm, presumably the nucleus of the Galaxy. Here we present the preliminary results of a positive measurement in the low energy γ-ray region of the spectrum, which are in good agreement with the X-ray data and confirm the intense high energy luminosity of the object.</description><subject>Humanities and Social Sciences</subject><subject>letter</subject><subject>multidisciplinary</subject><subject>Science</subject><subject>Science (multidisciplinary)</subject><issn>0028-0836</issn><issn>1476-4687</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1977</creationdate><recordtype>article</recordtype><recordid>eNplj81Kw0AUhQdRMFbBR8iyLkbvzZ0_lxK0CkU3ug6TzE1p0YzMVCXP5Xv4TEaqK1dn83HOd4Q4RThHIHdRWSC89LAnClTWSGWc3RcFQOUkODKH4ijnDQBotKoQ82X8KHngtBrLr0-Z_FjGNnN699t1HMrYl_eLWqHGY3HQ--fMJ785E08314_1rVw-LO7qq6XsKoNb6StU3KpWBwWtM0TaWOs7BtI0ebGplJuGew5B6R58B0TBBM8dKm0C0UzMd71dijkn7pvXtH7xaWwQmp-Hzd_DCT3boXlChhWnZhPf0jDZ_We_AZ6DTg8</recordid><startdate>19770101</startdate><enddate>19770101</enddate><creator>DI COCCO, G.</creator><creator>BOELLA, G.</creator><creator>PEROTTI, F.</creator><creator>STIGLITZ, R.</creator><creator>VILLA, G.</creator><creator>BAKER, R. E.</creator><creator>BUTLER, R. C.</creator><creator>DEAN, A. J.</creator><creator>MARTIN, S. J.</creator><creator>RAMSDEN, D.</creator><general>Nature Publishing Group UK</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19770101</creationdate><title>Low energy γ-ray observation of NGC4151</title><author>DI COCCO, G. ; BOELLA, G. ; PEROTTI, F. ; STIGLITZ, R. ; VILLA, G. ; BAKER, R. E. ; BUTLER, R. C. ; DEAN, A. J. ; MARTIN, S. J. ; RAMSDEN, D.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c261t-a214eb4b5d40b86335677ace0353319e6248174fedd45f0ac033d6daec1456d33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1977</creationdate><topic>Humanities and Social Sciences</topic><topic>letter</topic><topic>multidisciplinary</topic><topic>Science</topic><topic>Science (multidisciplinary)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>DI COCCO, G.</creatorcontrib><creatorcontrib>BOELLA, G.</creatorcontrib><creatorcontrib>PEROTTI, F.</creatorcontrib><creatorcontrib>STIGLITZ, R.</creatorcontrib><creatorcontrib>VILLA, G.</creatorcontrib><creatorcontrib>BAKER, R. E.</creatorcontrib><creatorcontrib>BUTLER, R. C.</creatorcontrib><creatorcontrib>DEAN, A. J.</creatorcontrib><creatorcontrib>MARTIN, S. J.</creatorcontrib><creatorcontrib>RAMSDEN, D.</creatorcontrib><collection>CrossRef</collection><jtitle>Nature (London)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>DI COCCO, G.</au><au>BOELLA, G.</au><au>PEROTTI, F.</au><au>STIGLITZ, R.</au><au>VILLA, G.</au><au>BAKER, R. E.</au><au>BUTLER, R. C.</au><au>DEAN, A. J.</au><au>MARTIN, S. J.</au><au>RAMSDEN, D.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Low energy γ-ray observation of NGC4151</atitle><jtitle>Nature (London)</jtitle><stitle>Nature</stitle><date>1977-01-01</date><risdate>1977</risdate><volume>270</volume><issue>5635</issue><spage>319</spage><epage>320</epage><pages>319-320</pages><issn>0028-0836</issn><eissn>1476-4687</eissn><abstract>OBSERVATIONS of the Seyfert galaxy NGC4151 by Ariel V, OSOI VII and UCSD (refs 1–3 respectively) have demonstrated that it has a relatively flat X-ray spectrum up to photon energies greater than 100 keV. The X-ray luminosity of this object is of the order of 4 × 10
43
erg s
−1
if a distance of 20 Mpc is assumed, and exceeds the integrated luminosity at all the other observed greater wavelengths. Long-term observations
4
by Ariel V indicate that the X-ray emission may originate from a compact object with dimensions less than 8 × 10
15
cm, presumably the nucleus of the Galaxy. Here we present the preliminary results of a positive measurement in the low energy γ-ray region of the spectrum, which are in good agreement with the X-ray data and confirm the intense high energy luminosity of the object.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><doi>10.1038/270319a0</doi><tpages>2</tpages></addata></record> |
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| ispartof | Nature (London), 1977-01, Vol.270 (5635), p.319-320 |
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| language | eng |
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| source | Nature |
| subjects | Humanities and Social Sciences letter multidisciplinary Science Science (multidisciplinary) |
| title | Low energy γ-ray observation of NGC4151 |
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