Narrow-line Seyfert galaxy in the constellation Sagittarius
PKS 2004-447 is a narrow-lineSeyfert 1 galaxy [ 1] constellation ofSagittarius . It has a redshift of (z) 0.24[ 2] AGN known in the southern hemisphere.[ 3] [ 4] astronomical radio source during avery-long-baseline interferometry survey in 1989.[ 5] radio spectrum appears to be powerful and compact, making it a compact steep spectrum source.[ 6] [ 7] X-ray emission for this source is described by a simplepower-law in the (0.5-10KeV ) energy range.[ 8]
PKS 2004-447 is classified as ablazar .[ 9] electromagnetic spectrum and is a source ofgamma ray activity .[ 10] [ 11] [ 12] −6 photon cm−2 s−1 at gamma-ray energies (0.1-300GeV ).[ 13] Balmer ,Paschen andHelium emission lines , with these lines vanishing within a period of 1.5 years.[ 12]
PKS 2004-447 has a core-jet structure withangular size measuring 40 mas. Its radio emission is found mainly dominated by the radio core, accounting for 42percent of its total flux density at 1.4GHz . There is a jet structure emerging from the core with a projectedposition angle measurement of -90°, which bends to -60° at 20 mas. This jet structure is further divided into two subcomponents enveloped completely from sight by the diffused emission.[ 14]
The host galaxy of PKS 2004-447 is a late-type barreddisk galaxy with astellar mass of ~ 7 x 1011 Mʘ, estimated from itsK-band luminosity. It has abulge showing a relatively lowSersic index of n ~ 1.2 with a bulge-to-total ratio of (B/T = 0.39 ± 0.02) for itsJ-band and (B/T = 0.44 ± 0.03) for itsKs-band . These values showed the bulge PKS 2004-447 is ofpseudobulge morphology.[ 15] spiral arms [ 16] black hole mass of 9 x 107 Mʘ .[ 15]
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S.; Carpenter, B.; Elsässer, D.; Gehrels, N.; Mannheim, K.; Müller, C.; Ojha, R.; Ros, E.; Trüstedt, J. (2016-01-01)."The gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447 - I. The X-ray View" .Astronomy & Astrophysics .585 : A91.arXiv :1509.03735 Bibcode :2016A&A...585A..91K .doi :10.1051/0004-6361/201424818 .ISSN 0004-6361 . ^ Jauncey, David L.; Savage, Ann; Morabito, David D.; Preston, Robert A.; Nicolson, George D.; Tzioumis, Anastasios K. (July 1989)."Optical identifications of southern compact radio sources" .The Astronomical Journal .98 : 54.Bibcode :1989AJ.....98...54J .doi :10.1086/115127 .ISSN 0004-6256 . ^ Gallo, L. C.; Edwards, P. G.; Ferrero, E.; Kataoka, J.; Lewis, D. R.; Ellingsen, S. P.; Misanovic, Z.; Welsh, W. F.; Whiting, M.; Boller, T.; Brinkmann, W.; Greenhill, J.; Oshlack, A. (2006-07-21)."The spectral energy distribution of PKS 2004-447: a compact steep-spectrum source and possible radio-loud narrow-line Seyfert 1 galaxy" .Monthly Notices of the Royal Astronomical Society .370 (1):245– 254.arXiv :astro-ph/0604480 Bibcode :2006MNRAS.370..245G .doi :10.1111/j.1365-2966.2006.10482.x ISSN 0035-8711 . ^ Berton, M.; Peluso, G.; Marziani, P.; Komossa, S.; Foschini, L.; Ciroi, S.; Chen, S.; Congiu, E.; Gallo, L. C.; Björklund, I.; Crepaldi, L.; Di Mille, F.; Järvelä, E.; Kotilainen, J.; Kreikenbohm, A. (October 2021)."Hunting for the nature of the enigmatic narrow-line Seyfert 1 galaxy PKS 2004-447" (PDF) .Astronomy & Astrophysics .654 : A125.arXiv :2106.12536 Bibcode :2021A&A...654A.125B .doi :10.1051/0004-6361/202141409 .ISSN 0004-6361 . ^ Kreikenbohm, A.; Schulz, R.; Kadler, M.; Wilms, J.; Markowitz, A.; Chang, C. S.; Carpenter, B.; Elsässer, D.; Gehrels, N.; Mannheim, K.; Müller, C.; Ojha, R.; Ros, E.; Trüstedt, J. 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Retrieved2024-11-04 .^a b Hon, W.; Berton, M.; Sani, E.; Webster, R.; Wolf, C.; Rojas, A. F.; Marziani, P.; Kotilainen, J.; Congiu, E. (April 2023)."A redshifted excess in the broad emission lines after the flare of theγ -ray narrow-line Seyfert 1 PKS 2004−447" (PDF) .Astronomy & Astrophysics .672 : L14.arXiv :2303.12109 Bibcode :2023A&A...672L..14H .doi :10.1051/0004-6361/202245184 .ISSN 0004-6361 . ^ Gokus, A.; Paliya, V. S.; Wagner, S. M.; Buson, S.; D’Ammando, F.; Edwards, P. G.; Kadler, M.; Meyer, M.; Ojha, R.; Stevens, J.; Wilms, J. (2021-05-01)."The first GeV flare of the radio-loud narrow-line Seyfert 1 galaxy PKS 2004–447" .Astronomy & Astrophysics .649 : A77.arXiv :2102.11633 Bibcode :2021A&A...649A..77G .doi :10.1051/0004-6361/202039378 .ISSN 0004-6361 . ^ Orienti, M.; D'Ammando, F.; Larsson, J.; Finke, J.; Giroletti, M.; Dallacasa, D.; Isacsson, T.; Stoby Hoglund, J. 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