Multiwavelength monitoring of the enigmatic narrow-line seyfert 1 PMN J0948+0022 in 2009 march-july

A. A. Abdo, M. Ackermann, M. Ajello, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, B. M. Baughman, K. Bechtol, R. Bellazzini, B. Berenji, E. D. Bloom, E. Bonamente, A. W. Borgland, J. Bregeon, A. Brez, M. Brigida, P. Bruel, T. H. Burnett & 188 others G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, Ö Çelik, A. Celotti, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, W. Collmar, J. Conrad, L. Costamante, S. Cutini, A. De Angelis, F. De Palma, E. Do Couto E Silva, P. S. Drell, D. Dumora, C. Farnier, C. Favuzzi, S. J. Fegan, W. B. Focke, P. Fortin, L. Foschini, M. Frailis, L. Fuhrmann, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, J. E. Grove, L. Guillemot, S. Guiriec, Y. Hanabata, E. Hays, R. E. Hughes, M. S. Jackson, G. Jóhannesson, A. S. Johnson, W. N. Johnson, M. Kadler, T. Kamae, H. Katagiri, Jun Kataoka, N. Kawai, M. Kerr, J. Knödlseder, M. L. Kocian, M. Kuss, J. Lande, L. Latronico, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, A. Makeev, W. Max-Moerbeck, M. N. Mazziotta, W. McConville, J. E. McEnery, S. McGlynn, C. Meurer, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, I. Nestoras, P. L. Nolan, J. P. Norris, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, D. Paneque, D. Parent, V. Pavlidou, V. Pelassa, M. Pepe, M. Pesce-Rollins, F. Piron, T. A. Porter, S. Rainò, R. Rando, M. Razzano, A. Readhead, O. Reimer, T. Reposeur, J. L. Richards, A. Y. Rodriguez, M. Roth, F. Ryde, H. F W Sadrozinski, D. Sanchez, A. Sander, P. M. Saz Parkinson, J. D. Scargle, C. Sgrò, M. S. Shaw, P. D. Smith, G. Spandre, P. Spinelli, M. S. Strickman, D. J. Suson, G. Tagliaferri, H. Tajima, H. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, D. J. Thompson, L. Tibaldo, O. Tibolla, D. F. Torres, G. Tosti, A. Tramacere, Y. Uchiyama, T. L. Usher, V. Vasileiou, N. Vilchez, V. Vitale, A. P. Waite, P. Wang, A. E. Wehrle, B. L. Winer, K. S. Wood, T. Ylinen, J. A. Zensus, M. Ziegler, E. Angelakis, C. Bailyn, H. Bignall, J. Blanchard, E. W. Bonning, M. Buxton, R. Canterna, A. Carramĩana, L. Carrasco, F. Colomer, A. Doi, G. Ghisellini, M. Hauser, X. Hong, J. Isler, M. Kino, Y. Y. Kovalev, Yu A. Kovalev, T. P. Krichbaum, A. Kutyrev, A. Lahteenmaki, H. J. Van Langevelde, M. L. Lister, D. MacOmb, L. Maraschi, N. Marchili, H. Nagai, Z. Paragi, C. Phillips, A. B. Pushkarev, E. Recillas, P. Roming, M. Sekido, M. A. Stark, A. Szomoru, J. Tammi, F. Tavecchio, M. Tornikoski, A. K. Tzioumis, C. M. Urry, S. Wagner

    Research output: Contribution to journalArticle

    63 Citations (Scopus)

    Abstract

    Following the recent discovery of γ rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to γ rays, which was carried out between the end of 2009 March and the beginning of July. The source displayed activity at all the observed wavelengths: a general decreasing trend from optical to γ-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the γ-ray emission. The largest flux change, about a factor of about 4, occurred in the X-ray band. The smallest was at ultraviolet and near-infrared frequencies, where the rate of the detected photons dropped by a factor 1.6-1.9. At optical wavelengths, where the sampling rate was the highest, it was possible to observe day scale variability, with flux variations up to a factor of about 3. The behavior of PMN J0948+0022 observed in this campaign and the calculated power carried out by its jet in the form of protons, electrons, radiation, and magnetic field are quite similar to that of blazars, specifically of flat-spectrum radio quasars. These results confirm the idea that radio-loud narrow-line Seyfert 1 galaxies host relativistic jets with power similar to that of average blazars.

    Original languageEnglish
    Pages (from-to)727-737
    Number of pages11
    JournalAstrophysical Journal
    Volume707
    Issue number1
    DOIs
    Publication statusPublished - 2009

    Fingerprint

    rays
    radio
    blazars
    monitoring
    galaxies
    radio spectra
    wavelength
    radio emission
    wavelengths
    radiation distribution
    quasars
    sampling
    near infrared
    trends
    protons
    magnetic field
    photons
    electron
    magnetic fields
    electrons

    Keywords

    • Gamma rays: observations

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Abdo, A. A., Ackermann, M., Ajello, M., Axelsson, M., Baldini, L., Ballet, J., ... Wagner, S. (2009). Multiwavelength monitoring of the enigmatic narrow-line seyfert 1 PMN J0948+0022 in 2009 march-july. Astrophysical Journal, 707(1), 727-737. https://doi.org/10.1088/0004-637X/707/1/727

    Multiwavelength monitoring of the enigmatic narrow-line seyfert 1 PMN J0948+0022 in 2009 march-july. / Abdo, A. A.; Ackermann, M.; Ajello, M.; Axelsson, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Baughman, B. M.; Bechtol, K.; Bellazzini, R.; Berenji, B.; Bloom, E. D.; Bonamente, E.; Borgland, A. W.; Bregeon, J.; Brez, A.; Brigida, M.; Bruel, P.; Burnett, T. H.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Casandjian, J. M.; Cavazzuti, E.; Cecchi, C.; Çelik, Ö; Celotti, A.; Chekhtman, A.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Collmar, W.; Conrad, J.; Costamante, L.; Cutini, S.; De Angelis, A.; De Palma, F.; Do Couto E Silva, E.; Drell, P. S.; Dumora, D.; Farnier, C.; Favuzzi, C.; Fegan, S. J.; Focke, W. B.; Fortin, P.; Foschini, L.; Frailis, M.; Fuhrmann, L.; Fukazawa, Y.; Funk, S.; Fusco, P.; Gargano, F.; Gehrels, N.; Germani, S.; Giglietto, N.; Giordano, F.; Giroletti, M.; Glanzman, T.; Godfrey, G.; Grenier, I. A.; Grove, J. E.; Guillemot, L.; Guiriec, S.; Hanabata, Y.; Hays, E.; Hughes, R. E.; Jackson, M. S.; Jóhannesson, G.; Johnson, A. S.; Johnson, W. N.; Kadler, M.; Kamae, T.; Katagiri, H.; Kataoka, Jun; Kawai, N.; Kerr, M.; Knödlseder, J.; Kocian, M. L.; Kuss, M.; Lande, J.; Latronico, L.; Longo, F.; Loparco, F.; Lott, B.; Lovellette, M. N.; Lubrano, P.; Madejski, G. M.; Makeev, A.; Max-Moerbeck, W.; Mazziotta, M. N.; McConville, W.; McEnery, J. E.; McGlynn, S.; Meurer, C.; Michelson, P. F.; Mitthumsiri, W.; Mizuno, T.; Moiseev, A. A.; Monte, C.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Nestoras, I.; Nolan, P. L.; Norris, J. P.; Nuss, E.; Ohsugi, T.; Omodei, N.; Orlando, E.; Ormes, J. F.; Paneque, D.; Parent, D.; Pavlidou, V.; Pelassa, V.; Pepe, M.; Pesce-Rollins, M.; Piron, F.; Porter, T. A.; Rainò, S.; Rando, R.; Razzano, M.; Readhead, A.; Reimer, O.; Reposeur, T.; Richards, J. L.; Rodriguez, A. Y.; Roth, M.; Ryde, F.; Sadrozinski, H. F W; Sanchez, D.; Sander, A.; Saz Parkinson, P. M.; Scargle, J. D.; Sgrò, C.; Shaw, M. S.; Smith, P. D.; Spandre, G.; Spinelli, P.; Strickman, M. S.; Suson, D. J.; Tagliaferri, G.; Tajima, H.; Takahashi, H.; Tanaka, T.; Thayer, J. B.; Thayer, J. G.; Thompson, D. J.; Tibaldo, L.; Tibolla, O.; Torres, D. F.; Tosti, G.; Tramacere, A.; Uchiyama, Y.; Usher, T. L.; Vasileiou, V.; Vilchez, N.; Vitale, V.; Waite, A. P.; Wang, P.; Wehrle, A. E.; Winer, B. L.; Wood, K. S.; Ylinen, T.; Zensus, J. A.; Ziegler, M.; Angelakis, E.; Bailyn, C.; Bignall, H.; Blanchard, J.; Bonning, E. W.; Buxton, M.; Canterna, R.; Carramĩana, A.; Carrasco, L.; Colomer, F.; Doi, A.; Ghisellini, G.; Hauser, M.; Hong, X.; Isler, J.; Kino, M.; Kovalev, Y. Y.; Kovalev, Yu A.; Krichbaum, T. P.; Kutyrev, A.; Lahteenmaki, A.; Van Langevelde, H. J.; Lister, M. L.; MacOmb, D.; Maraschi, L.; Marchili, N.; Nagai, H.; Paragi, Z.; Phillips, C.; Pushkarev, A. B.; Recillas, E.; Roming, P.; Sekido, M.; Stark, M. A.; Szomoru, A.; Tammi, J.; Tavecchio, F.; Tornikoski, M.; Tzioumis, A. K.; Urry, C. M.; Wagner, S.

    In: Astrophysical Journal, Vol. 707, No. 1, 2009, p. 727-737.

    Research output: Contribution to journalArticle

    Abdo, AA, Ackermann, M, Ajello, M, Axelsson, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Baughman, BM, Bechtol, K, Bellazzini, R, Berenji, B, Bloom, ED, Bonamente, E, Borgland, AW, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Burnett, TH, Caliandro, GA, Cameron, RA, Caraveo, PA, Casandjian, JM, Cavazzuti, E, Cecchi, C, Çelik, Ö, Celotti, A, Chekhtman, A, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Collmar, W, Conrad, J, Costamante, L, Cutini, S, De Angelis, A, De Palma, F, Do Couto E Silva, E, Drell, PS, Dumora, D, Farnier, C, Favuzzi, C, Fegan, SJ, Focke, WB, Fortin, P, Foschini, L, Frailis, M, Fuhrmann, L, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gehrels, N, Germani, S, Giglietto, N, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, IA, Grove, JE, Guillemot, L, Guiriec, S, Hanabata, Y, Hays, E, Hughes, RE, Jackson, MS, Jóhannesson, G, Johnson, AS, Johnson, WN, Kadler, M, Kamae, T, Katagiri, H, Kataoka, J, Kawai, N, Kerr, M, Knödlseder, J, Kocian, ML, Kuss, M, Lande, J, Latronico, L, Longo, F, Loparco, F, Lott, B, Lovellette, MN, Lubrano, P, Madejski, GM, Makeev, A, Max-Moerbeck, W, Mazziotta, MN, McConville, W, McEnery, JE, McGlynn, S, Meurer, C, Michelson, PF, Mitthumsiri, W, Mizuno, T, Moiseev, AA, Monte, C, Monzani, ME, Morselli, A, Moskalenko, IV, Nestoras, I, Nolan, PL, Norris, JP, Nuss, E, Ohsugi, T, Omodei, N, Orlando, E, Ormes, JF, Paneque, D, Parent, D, Pavlidou, V, Pelassa, V, Pepe, M, Pesce-Rollins, M, Piron, F, Porter, TA, Rainò, S, Rando, R, Razzano, M, Readhead, A, Reimer, O, Reposeur, T, Richards, JL, Rodriguez, AY, Roth, M, Ryde, F, Sadrozinski, HFW, Sanchez, D, Sander, A, Saz Parkinson, PM, Scargle, JD, Sgrò, C, Shaw, MS, Smith, PD, Spandre, G, Spinelli, P, Strickman, MS, Suson, DJ, Tagliaferri, G, Tajima, H, Takahashi, H, Tanaka, T, Thayer, JB, Thayer, JG, Thompson, DJ, Tibaldo, L, Tibolla, O, Torres, DF, Tosti, G, Tramacere, A, Uchiyama, Y, Usher, TL, Vasileiou, V, Vilchez, N, Vitale, V, Waite, AP, Wang, P, Wehrle, AE, Winer, BL, Wood, KS, Ylinen, T, Zensus, JA, Ziegler, M, Angelakis, E, Bailyn, C, Bignall, H, Blanchard, J, Bonning, EW, Buxton, M, Canterna, R, Carramĩana, A, Carrasco, L, Colomer, F, Doi, A, Ghisellini, G, Hauser, M, Hong, X, Isler, J, Kino, M, Kovalev, YY, Kovalev, YA, Krichbaum, TP, Kutyrev, A, Lahteenmaki, A, Van Langevelde, HJ, Lister, ML, MacOmb, D, Maraschi, L, Marchili, N, Nagai, H, Paragi, Z, Phillips, C, Pushkarev, AB, Recillas, E, Roming, P, Sekido, M, Stark, MA, Szomoru, A, Tammi, J, Tavecchio, F, Tornikoski, M, Tzioumis, AK, Urry, CM & Wagner, S 2009, 'Multiwavelength monitoring of the enigmatic narrow-line seyfert 1 PMN J0948+0022 in 2009 march-july', Astrophysical Journal, vol. 707, no. 1, pp. 727-737. https://doi.org/10.1088/0004-637X/707/1/727
    Abdo, A. A. ; Ackermann, M. ; Ajello, M. ; Axelsson, M. ; Baldini, L. ; Ballet, J. ; Barbiellini, G. ; Bastieri, D. ; Baughman, B. M. ; Bechtol, K. ; Bellazzini, R. ; Berenji, B. ; Bloom, E. D. ; Bonamente, E. ; Borgland, A. W. ; Bregeon, J. ; Brez, A. ; Brigida, M. ; Bruel, P. ; Burnett, T. H. ; Caliandro, G. A. ; Cameron, R. A. ; Caraveo, P. A. ; Casandjian, J. M. ; Cavazzuti, E. ; Cecchi, C. ; Çelik, Ö ; Celotti, A. ; Chekhtman, A. ; Chiang, J. ; Ciprini, S. ; Claus, R. ; Cohen-Tanugi, J. ; Collmar, W. ; Conrad, J. ; Costamante, L. ; Cutini, S. ; De Angelis, A. ; De Palma, F. ; Do Couto E Silva, E. ; Drell, P. S. ; Dumora, D. ; Farnier, C. ; Favuzzi, C. ; Fegan, S. J. ; Focke, W. B. ; Fortin, P. ; Foschini, L. ; Frailis, M. ; Fuhrmann, L. ; Fukazawa, Y. ; Funk, S. ; Fusco, P. ; Gargano, F. ; Gehrels, N. ; Germani, S. ; Giglietto, N. ; Giordano, F. ; Giroletti, M. ; Glanzman, T. ; Godfrey, G. ; Grenier, I. A. ; Grove, J. E. ; Guillemot, L. ; Guiriec, S. ; Hanabata, Y. ; Hays, E. ; Hughes, R. E. ; Jackson, M. S. ; Jóhannesson, G. ; Johnson, A. S. ; Johnson, W. N. ; Kadler, M. ; Kamae, T. ; Katagiri, H. ; Kataoka, Jun ; Kawai, N. ; Kerr, M. ; Knödlseder, J. ; Kocian, M. L. ; Kuss, M. ; Lande, J. ; Latronico, L. ; Longo, F. ; Loparco, F. ; Lott, B. ; Lovellette, M. N. ; Lubrano, P. ; Madejski, G. M. ; Makeev, A. ; Max-Moerbeck, W. ; Mazziotta, M. N. ; McConville, W. ; McEnery, J. E. ; McGlynn, S. ; Meurer, C. ; Michelson, P. F. ; Mitthumsiri, W. ; Mizuno, T. ; Moiseev, A. A. ; Monte, C. ; Monzani, M. E. ; Morselli, A. ; Moskalenko, I. V. ; Nestoras, I. ; Nolan, P. L. ; Norris, J. P. ; Nuss, E. ; Ohsugi, T. ; Omodei, N. ; Orlando, E. ; Ormes, J. F. ; Paneque, D. ; Parent, D. ; Pavlidou, V. ; Pelassa, V. ; Pepe, M. ; Pesce-Rollins, M. ; Piron, F. ; Porter, T. A. ; Rainò, S. ; Rando, R. ; Razzano, M. ; Readhead, A. ; Reimer, O. ; Reposeur, T. ; Richards, J. L. ; Rodriguez, A. Y. ; Roth, M. ; Ryde, F. ; Sadrozinski, H. F W ; Sanchez, D. ; Sander, A. ; Saz Parkinson, P. M. ; Scargle, J. D. ; Sgrò, C. ; Shaw, M. S. ; Smith, P. D. ; Spandre, G. ; Spinelli, P. ; Strickman, M. S. ; Suson, D. J. ; Tagliaferri, G. ; Tajima, H. ; Takahashi, H. ; Tanaka, T. ; Thayer, J. B. ; Thayer, J. G. ; Thompson, D. J. ; Tibaldo, L. ; Tibolla, O. ; Torres, D. F. ; Tosti, G. ; Tramacere, A. ; Uchiyama, Y. ; Usher, T. L. ; Vasileiou, V. ; Vilchez, N. ; Vitale, V. ; Waite, A. P. ; Wang, P. ; Wehrle, A. E. ; Winer, B. L. ; Wood, K. S. ; Ylinen, T. ; Zensus, J. A. ; Ziegler, M. ; Angelakis, E. ; Bailyn, C. ; Bignall, H. ; Blanchard, J. ; Bonning, E. W. ; Buxton, M. ; Canterna, R. ; Carramĩana, A. ; Carrasco, L. ; Colomer, F. ; Doi, A. ; Ghisellini, G. ; Hauser, M. ; Hong, X. ; Isler, J. ; Kino, M. ; Kovalev, Y. Y. ; Kovalev, Yu A. ; Krichbaum, T. P. ; Kutyrev, A. ; Lahteenmaki, A. ; Van Langevelde, H. J. ; Lister, M. L. ; MacOmb, D. ; Maraschi, L. ; Marchili, N. ; Nagai, H. ; Paragi, Z. ; Phillips, C. ; Pushkarev, A. B. ; Recillas, E. ; Roming, P. ; Sekido, M. ; Stark, M. A. ; Szomoru, A. ; Tammi, J. ; Tavecchio, F. ; Tornikoski, M. ; Tzioumis, A. K. ; Urry, C. M. ; Wagner, S. / Multiwavelength monitoring of the enigmatic narrow-line seyfert 1 PMN J0948+0022 in 2009 march-july. In: Astrophysical Journal. 2009 ; Vol. 707, No. 1. pp. 727-737.
    @article{71bb5390b3a740f8996271e4032da8c5,
    title = "Multiwavelength monitoring of the enigmatic narrow-line seyfert 1 PMN J0948+0022 in 2009 march-july",
    abstract = "Following the recent discovery of γ rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to γ rays, which was carried out between the end of 2009 March and the beginning of July. The source displayed activity at all the observed wavelengths: a general decreasing trend from optical to γ-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the γ-ray emission. The largest flux change, about a factor of about 4, occurred in the X-ray band. The smallest was at ultraviolet and near-infrared frequencies, where the rate of the detected photons dropped by a factor 1.6-1.9. At optical wavelengths, where the sampling rate was the highest, it was possible to observe day scale variability, with flux variations up to a factor of about 3. The behavior of PMN J0948+0022 observed in this campaign and the calculated power carried out by its jet in the form of protons, electrons, radiation, and magnetic field are quite similar to that of blazars, specifically of flat-spectrum radio quasars. These results confirm the idea that radio-loud narrow-line Seyfert 1 galaxies host relativistic jets with power similar to that of average blazars.",
    keywords = "Gamma rays: observations",
    author = "Abdo, {A. A.} and M. Ackermann and M. Ajello and M. Axelsson and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and Baughman, {B. M.} and K. Bechtol and R. Bellazzini and B. Berenji and Bloom, {E. D.} and E. Bonamente and Borgland, {A. W.} and J. Bregeon and A. Brez and M. Brigida and P. Bruel and Burnett, {T. H.} and Caliandro, {G. A.} and Cameron, {R. A.} and Caraveo, {P. A.} and Casandjian, {J. M.} and E. Cavazzuti and C. Cecchi and {\"O} {\cC}elik and A. Celotti and A. Chekhtman and J. Chiang and S. Ciprini and R. Claus and J. Cohen-Tanugi and W. Collmar and J. Conrad and L. Costamante and S. Cutini and {De Angelis}, A. and {De Palma}, F. and {Do Couto E Silva}, E. and Drell, {P. S.} and D. Dumora and C. Farnier and C. Favuzzi and Fegan, {S. J.} and Focke, {W. B.} and P. Fortin and L. Foschini and M. Frailis and L. Fuhrmann and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and N. Gehrels and S. Germani and N. Giglietto and F. Giordano and M. Giroletti and T. Glanzman and G. Godfrey and Grenier, {I. A.} and Grove, {J. E.} and L. Guillemot and S. Guiriec and Y. Hanabata and E. Hays and Hughes, {R. E.} and Jackson, {M. S.} and G. J{\'o}hannesson and Johnson, {A. S.} and Johnson, {W. N.} and M. Kadler and T. Kamae and H. Katagiri and Jun Kataoka and N. Kawai and M. Kerr and J. Kn{\"o}dlseder and Kocian, {M. L.} and M. Kuss and J. Lande and L. Latronico and F. Longo and F. Loparco and B. Lott and Lovellette, {M. N.} and P. Lubrano and Madejski, {G. M.} and A. Makeev and W. Max-Moerbeck and Mazziotta, {M. N.} and W. McConville and McEnery, {J. E.} and S. McGlynn and C. Meurer and Michelson, {P. F.} and W. Mitthumsiri and T. Mizuno and Moiseev, {A. A.} and C. Monte and Monzani, {M. E.} and A. Morselli and Moskalenko, {I. V.} and I. Nestoras and Nolan, {P. L.} and Norris, {J. P.} and E. Nuss and T. Ohsugi and N. Omodei and E. Orlando and Ormes, {J. F.} and D. Paneque and D. Parent and V. Pavlidou and V. Pelassa and M. Pepe and M. Pesce-Rollins and F. Piron and Porter, {T. A.} and S. Rain{\`o} and R. Rando and M. Razzano and A. Readhead and O. Reimer and T. Reposeur and Richards, {J. L.} and Rodriguez, {A. Y.} and M. Roth and F. Ryde and Sadrozinski, {H. F W} and D. Sanchez and A. Sander and {Saz Parkinson}, {P. M.} and Scargle, {J. D.} and C. Sgr{\`o} and Shaw, {M. S.} and Smith, {P. D.} and G. Spandre and P. Spinelli and Strickman, {M. S.} and Suson, {D. J.} and G. Tagliaferri and H. Tajima and H. Takahashi and T. Tanaka and Thayer, {J. B.} and Thayer, {J. G.} and Thompson, {D. J.} and L. Tibaldo and O. Tibolla and Torres, {D. F.} and G. Tosti and A. Tramacere and Y. Uchiyama and Usher, {T. L.} and V. Vasileiou and N. Vilchez and V. Vitale and Waite, {A. P.} and P. Wang and Wehrle, {A. E.} and Winer, {B. L.} and Wood, {K. S.} and T. Ylinen and Zensus, {J. A.} and M. Ziegler and E. Angelakis and C. Bailyn and H. Bignall and J. Blanchard and Bonning, {E. W.} and M. Buxton and R. Canterna and A. Carramĩana and L. Carrasco and F. Colomer and A. Doi and G. Ghisellini and M. Hauser and X. Hong and J. Isler and M. Kino and Kovalev, {Y. Y.} and Kovalev, {Yu A.} and Krichbaum, {T. P.} and A. Kutyrev and A. Lahteenmaki and {Van Langevelde}, {H. J.} and Lister, {M. L.} and D. MacOmb and L. Maraschi and N. Marchili and H. Nagai and Z. Paragi and C. Phillips and Pushkarev, {A. B.} and E. Recillas and P. Roming and M. Sekido and Stark, {M. A.} and A. Szomoru and J. Tammi and F. Tavecchio and M. Tornikoski and Tzioumis, {A. K.} and Urry, {C. M.} and S. Wagner",
    year = "2009",
    doi = "10.1088/0004-637X/707/1/727",
    language = "English",
    volume = "707",
    pages = "727--737",
    journal = "Astrophysical Journal",
    issn = "0004-637X",
    publisher = "IOP Publishing Ltd.",
    number = "1",

    }

    TY - JOUR

    T1 - Multiwavelength monitoring of the enigmatic narrow-line seyfert 1 PMN J0948+0022 in 2009 march-july

    AU - Abdo, A. A.

    AU - Ackermann, M.

    AU - Ajello, M.

    AU - Axelsson, M.

    AU - Baldini, L.

    AU - Ballet, J.

    AU - Barbiellini, G.

    AU - Bastieri, D.

    AU - Baughman, B. M.

    AU - Bechtol, K.

    AU - Bellazzini, R.

    AU - Berenji, B.

    AU - Bloom, E. D.

    AU - Bonamente, E.

    AU - Borgland, A. W.

    AU - Bregeon, J.

    AU - Brez, A.

    AU - Brigida, M.

    AU - Bruel, P.

    AU - Burnett, T. H.

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    PY - 2009

    Y1 - 2009

    N2 - Following the recent discovery of γ rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to γ rays, which was carried out between the end of 2009 March and the beginning of July. The source displayed activity at all the observed wavelengths: a general decreasing trend from optical to γ-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the γ-ray emission. The largest flux change, about a factor of about 4, occurred in the X-ray band. The smallest was at ultraviolet and near-infrared frequencies, where the rate of the detected photons dropped by a factor 1.6-1.9. At optical wavelengths, where the sampling rate was the highest, it was possible to observe day scale variability, with flux variations up to a factor of about 3. The behavior of PMN J0948+0022 observed in this campaign and the calculated power carried out by its jet in the form of protons, electrons, radiation, and magnetic field are quite similar to that of blazars, specifically of flat-spectrum radio quasars. These results confirm the idea that radio-loud narrow-line Seyfert 1 galaxies host relativistic jets with power similar to that of average blazars.

    AB - Following the recent discovery of γ rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to γ rays, which was carried out between the end of 2009 March and the beginning of July. The source displayed activity at all the observed wavelengths: a general decreasing trend from optical to γ-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the γ-ray emission. The largest flux change, about a factor of about 4, occurred in the X-ray band. The smallest was at ultraviolet and near-infrared frequencies, where the rate of the detected photons dropped by a factor 1.6-1.9. At optical wavelengths, where the sampling rate was the highest, it was possible to observe day scale variability, with flux variations up to a factor of about 3. The behavior of PMN J0948+0022 observed in this campaign and the calculated power carried out by its jet in the form of protons, electrons, radiation, and magnetic field are quite similar to that of blazars, specifically of flat-spectrum radio quasars. These results confirm the idea that radio-loud narrow-line Seyfert 1 galaxies host relativistic jets with power similar to that of average blazars.

    KW - Gamma rays: observations

    UR - http://www.scopus.com/inward/record.url?scp=72849117027&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=72849117027&partnerID=8YFLogxK

    U2 - 10.1088/0004-637X/707/1/727

    DO - 10.1088/0004-637X/707/1/727

    M3 - Article

    VL - 707

    SP - 727

    EP - 737

    JO - Astrophysical Journal

    JF - Astrophysical Journal

    SN - 0004-637X

    IS - 1

    ER -