Abstract
Probing the physics of the accretion flow around active galactic nuclei (AGN) is crucial to understanding their emission mechanisms as well as being able to constrain the geometrical and variability properties of the different regions around them. The soft X-ray excess – usually observed below \(\sim2\) keV in excess of the dominant X-ray powerlaw continuum – is one prominent feature that is commonly seen in type 1 Seyfert AGN and therefore readily provides a useful diagnostic of the accretion flow mechanism around these systems. NGC 5940 is a Seyfert 1 AGN which reveals strong, prominent soft X-ray excess below \(\sim2\) keV as seen in both its XMM-Newton and Swift observations. Model fit to the data revealed that this feature could be equally well explained by the ionised partial covering, the thermal Comptonisation and the blurred reflection models. Although the other models cannot be decisively ruled out with the data at hand, the lack of significant broad iron \(K_{\alpha}\) as well as any significant emission/absorption line features in the reflection grating spectrometer (RGS) data tend to favour the thermal Comptonisation origin for the soft X-ray excess in NGC 5940.
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References
Adegoke, O., Rakshit, S., Mukhopadhyay, B.: Mon. Not. R. Astron. Soc. 466, 3951 (2017). https://doi.org/10.1093/mnras/stw3320. 1612.06817
Adegoke, O., Dewangan, G.C., Pawar, P., Pal, M.: Astrophys. J. Lett. 870(2), 13 (2019). https://doi.org/10.3847/2041-8213/aaf8ab. 1812.08056
Arnaud, K.A.: In: Jacoby, G.H., Barnes, J. (eds.) Astronomical Data Analysis Software and Systems V. Astronomical Society of the Pacific Conference Series, vol. 101, p. 17 (1996)
Arnaud, K.A., Branduardi-Raymont, G., Culhane, J.L., Fabian, A.C., Hazard, C., McGlynn, T.A., Shafer, R.A., Tennant, A.F., Ward, M.J.: Mon. Not. R. Astron. Soc. 217, 105 (1985). https://doi.org/10.1093/mnras/217.1.105
Barth, A.J., Pancoast, A., Bennert, V.N., Brewer, B.J., Canalizo, G., Filippenko, A.V., Gates, E.L., Greene, J.E., Li, W., Malkan, M.A., Sand, D.J., Stern, D., Treu, T., Woo, J.-H., Assef, R.J., Bae, H.-J., Buehler, T., Cenko, S.B., Clubb, K.I., Cooper, M.C., Diamond-Stanic, A.M., Hönig, S.F., Joner, M.D., Laney, C.D., Lazarova, M.S., Nierenberg, A.M., Silverman, J.M., Tollerud, E.J., Walsh, J.L.: Astrophys. J. 769(2), 128 (2013). https://doi.org/10.1088/0004-637X/769/2/128. 1304.4643
Barth, A.J., Bennert, V.N., Canalizo, G., Filippenko, A.V., Gates, E.L., Greene, J.E., Li, W., Malkan, M.A., Pancoast, A., Sand, D.J., Stern, D., Treu, T., Woo, J.-H., Assef, R.J., Bae, H.-J., Brewer, B.J., Cenko, S.B., Clubb, K.I., Cooper, M.C., Diamond-Stanic, A.M., Hiner, K.D., Hönig, S.F., Hsiao, E., Kandrashoff, M.T., Lazarova, M.S., Nierenberg, A.M., Rex, J., Silverman, J.M., Tollerud, E.J., Walsh, J.L.: Astrophys. J. Suppl. Ser. 217(2), 26 (2015). https://doi.org/10.1088/0067-0049/217/2/26. 1503.01146
Bentz, M.C., Katz, S.: Publ. Astron. Soc. Pac. 127(947), 67 (2015). https://doi.org/10.1086/679601. 1411.2596
Bhattacharyya, S., Bhatt, H., Bhatt, N., Singh, K.K.: Mon. Not. R. Astron. Soc. 440(1), 106 (2014). https://doi.org/10.1093/mnras/stu239. 1301.1150
Burrows, D.N., Hill, J.E., Nousek, J.A., Kennea, J.A., Wells, A., Osborne, J.P., Abbey, A.F., Beardmore, A., Mukerjee, K., Short, A.D.T., Chincarini, G., Campana, S., Citterio, O., Moretti, A., Pagani, C., Tagliaferri, G., Giommi, P., Capalbi, M., Tamburelli, F., Angelini, L., Cusumano, G., Bräuninger, H.W., Burkert, W., Hartner, G.D.: Space Sci. Rev. 120(3-4), 165 (2005). https://doi.org/10.1007/s11214-005-5097-2. astro-ph/0508071
Cackett, E.M., Horne, K., Winkler, H.: Mon. Not. R. Astron. Soc. 380, 669 (2007). https://doi.org/10.1111/j.1365-2966.2007.12098.x. 0706.1464
Cackett, E.M., Fabian, A.C., Zogbhi, A., Kara, E., Reynolds, C., Uttley, P.: Astrophys. J. Lett. 764(1), 9 (2013). https://doi.org/10.1088/2041-8205/764/1/L9. 1210.7874
Castelló-Mor, N., Netzer, H., Kaspi, S.: Mon. Not. R. Astron. Soc. 458(2), 1839 (2016). https://doi.org/10.1093/mnras/stw445. 1601.07177
Crummy, J., Fabian, A.C., Brandt, W.N., Boller, T.: Mon. Not. R. Astron. Soc. 361(4), 1197 (2005). https://doi.org/10.1111/j.1365-2966.2005.09258.x. astro-ph/0506119
Crummy, J., Fabian, A.C., Gallo, L., Ross, R.R.: Mon. Not. R. Astron. Soc. 365(4), 1067 (2006). https://doi.org/10.1111/j.1365-2966.2005.09844.x. astro-ph/0511457
Dauser, T., Garcia, J., Parker, M.L., Fabian, A.C., Wilms, J.: Mon. Not. R. Astron. Soc. 444, 100 (2014). https://doi.org/10.1093/mnrasl/slu125. 1408.2347
den Herder, J.W., Brinkman, A.C., Kahn, S.M., Branduardi-Raymont, G., Thomsen, K., Aarts, H., Audard, M., Bixler, J.V., den Boggende, A.J., Cottam, J., Decker, T., Dubbeldam, L., Erd, C., Goulooze, H., Güdel, M., Guttridge, P., Hailey, C.J., Janabi, K.A., Kaastra, J.S., de Korte, P.A.J., van Leeuwen, B.J., Mauche, C., McCalden, A.J., Mewe, R., Naber, A., Paerels, F.B., Peterson, J.R., Rasmussen, A.P., Rees, K., Sakelliou, I., Sako, M., Spodek, J., Stern, M., Tamura, T., Tandy, J., de Vries, C.P., Welch, S., Zehnder, A.: Astron. Astrophys. 365, 7 (2001). https://doi.org/10.1051/0004-6361:20000058
Done, C., Davis, S.W., Jin, C., Blaes, O., Ward, M.: Mon. Not. R. Astron. Soc. 420(3), 1848 (2012). https://doi.org/10.1111/j.1365-2966.2011.19779.x. 1107.5429
Evans, P.A., Beardmore, A.P., Page, K.L., Osborne, J.P., O’Brien, P.T., Willingale, R., Starling, R.L.C., Burrows, D.N., Godet, O., Vetere, L., Racusin, J., Goad, M.R., Wiersema, K., Angelini, L., Capalbi, M., Chincarini, G., Gehrels, N., Kennea, J.A., Margutti, R., Morris, D.C., Mountford, C.J., Pagani, C., Perri, M., Romano, P., Tanvir, N.: Mon. Not. R. Astron. Soc. 397(3), 1177 (2009). https://doi.org/10.1111/j.1365-2966.2009.14913.x. 0812.3662
Fabian, A.C., Miniutti, G., Gallo, L., Boller, T., Tanaka, Y., Vaughan, S., Ross, R.R.: Mon. Not. R. Astron. Soc. 353(4), 1071 (2004). https://doi.org/10.1111/j.1365-2966.2004.08036.x. astro-ph/0405160
Fabian, A.C., Zoghbi, A., Ross, R.R., Uttley, P., Gallo, L.C., Brandt, W.N., Blustin, A.J., Boller, T., Caballero-Garcia, M.D., Larsson, J., Miller, J.M., Miniutti, G., Ponti, G., Reis, R.C., Reynolds, C.S., Tanaka, Y., Young, A.J.: Nature 459(7246), 540 (2009). https://doi.org/10.1038/nature08007
Gallo, L.C., Grupe, D., Schartel, N., Komossa, S., Miniutti, G., Fabian, A.C., Santos-Lleo, M.: Mon. Not. R. Astron. Soc. 412(1), 161 (2011). https://doi.org/10.1111/j.1365-2966.2010.17894.x. 1010.4453
García, J., Dauser, T., Lohfink, A., Kallman, T.R., Steiner, J.F., McClintock, J.E., Brenneman, L., Wilms, J., Eikmann, W., Reynolds, C.S., Tombesi, F.: Astrophys. J. 782(2), 76 (2014). https://doi.org/10.1088/0004-637X/782/2/76. 1312.3231
Gehrels, N., Chincarini, G., Giommi, P., Mason, K.O., Nousek, J.A., Wells, A.A., White, N.E., Barthelmy, S.D., Burrows, D.N., Cominsky, L.R., Hurley, K.C., Marshall, F.E., Mészáros, P., Roming, P.W.A., Angelini, L., Barbier, L.M., Belloni, T., Campana, S., Caraveo, P.A., Chester, M.M., Citterio, O., Cline, T.L., Cropper, M.S., Cummings, J.R., Dean, A.J., Feigelson, E.D., Fenimore, E.E., Frail, D.A., Fruchter, A.S., Garmire, G.P., Gendreau, K., Ghisellini, G., Greiner, J., Hill, J.E., Hunsberger, S.D., Krimm, H.A., Kulkarni, S.R., Kumar, P., Lebrun, F., Lloyd-Ronning, N.M., Markwardt, C.B., Mattson, B.J., Mushotzky, R.F., Norris, J.P., Osborne, J., Paczynski, B., Palmer, D.M., Park, H.-S., Parsons, A.M., Paul, J., Rees, M.J., Reynolds, C.S., Rhoads, J.E., Sasseen, T.P., Schaefer, B.E., Short, A.T., Smale, A.P., Smith, I.A., Stella, L., Tagliaferri, G., Takahashi, T., Tashiro, M., Townsley, L.K., Tueller, J., Turner, M.J.L., Vietri, M., Voges, W., Ward, M.J., Willingale, R., Zerbi, F.M., Zhang, W.W.: Astrophys. J. 611(2), 1005 (2004). https://doi.org/10.1086/422091. astro-ph/0405233
Gierliński, M., Done, C.: Mon. Not. R. Astron. Soc. 349(1), 7 (2004). https://doi.org/10.1111/j.1365-2966.2004.07687.x. astro-ph/0312271
Gliozzi, M., Williams, J.K.: Mon. Not. R. Astron. Soc. 491(1), 532 (2020). https://doi.org/10.1093/mnras/stz3005. 1910.12115
Haardt, F., Maraschi, L.: Astrophys. J. 413, 507 (1993). https://doi.org/10.1086/173020
HI4PI Collaboration, Ben Bekhti, N., Flöer, L., Keller, R., Kerp, J., Lenz, D., Winkel, B., Bailin, J., Calabretta, M.R., Dedes, L., Ford, H.A., Gibson, B.K., Haud, U., Janowiecki, S., Kalberla, P.M.W., Lockman, F.J., McClure-Griffiths, N.M., Murphy, T., Nakanishi, H., Pisano, D.J., Staveley-Smith, L.: Astron. Astrophys. 594, 116 (2016). https://doi.org/10.1051/0004-6361/201629178. 1610.06175
Jansen, F., Lumb, D., Altieri, B., Clavel, J., Ehle, M., Erd, C., Gabriel, C., Guainazzi, M., Gondoin, P., Much, R., Munoz, R., Santos, M., Schartel, N., Texier, D., Vacanti, G.: Astron. Astrophys. 365, 1 (2001). https://doi.org/10.1051/0004-6361:20000036
Jiang, J., Fabian, A.C., Dauser, T., Gallo, L., García, J.A., Kara, E., Parker, M.L., Tomsick, J.A., Walton, D.J., Reynolds, C.S.: Mon. Not. R. Astron. Soc. 489(3), 3436 (2019). https://doi.org/10.1093/mnras/stz2326. 1908.07272
Jin, C., Ward, M., Done, C.: Mon. Not. R. Astron. Soc. 425(2), 907 (2012). https://doi.org/10.1111/j.1365-2966.2012.21272.x. 1205.1846
Krolik, J.H., Horne, K., Kallman, T.R., Malkan, M.A., Edelson, R.A., Kriss, G.A.: Astrophys. J. 371, 541 (1991). https://doi.org/10.1086/169918
Magdziarz, P., Blaes, O.M., Zdziarski, A.A., Johnson, W.N., Smith, D.A.: Mon. Not. R. Astron. Soc. 301(1), 179 (1998). https://doi.org/10.1046/j.1365-8711.1998.02015.x
Makishima, K., Maejima, Y., Mitsuda, K., Bradt, H.V., Remillard, R.A., Tuohy, I.R., Hoshi, R., Nakagawa, M.: Astrophys. J. 308, 635 (1986). https://doi.org/10.1086/164534
Mason, K.O., Breeveld, A., Much, R., Carter, M., Cordova, F.A., Cropper, M.S., Fordham, J., Huckle, H., Ho, C., Kawakami, H., Kennea, J., Kennedy, T., Mittaz, J., Pandel, D., Priedhorsky, W.C., Sasseen, T., Shirey, R., Smith, P., Vreux, J.-M.: Astron. Astrophys. 365, 36 (2001). https://doi.org/10.1051/0004-6361:20000044. astro-ph/0011216
Matzeu, G.A., Nardini, E., Parker, M.L., Reeves, J.N., Braito, V., Porquet, D., Middei, R., Kammoun, E., Lusso, E., Alston, W.N., Giustini, M., Lobban, A.P., Joyce, A.M., Igo, Z., Ebrero, J., Ballo, L., Santos-Lleó, M., Schartel, N.: Mon. Not. R. Astron. Soc. 497(2), 2352 (2020). https://doi.org/10.1093/mnras/staa2076. 2007.06575
Mehdipour, M., Branduardi-Raymont, G., Kaastra, J.S., Petrucci, P.O., Kriss, G.A., Ponti, G., Blustin, A.J., Paltani, S., Cappi, M., Detmers, R.G., Steenbrugge, K.C.: Astron. Astrophys. 534, 39 (2011). https://doi.org/10.1051/0004-6361/201116875. 1107.0659
Miller, L., Turner, T.J., Reeves, J.N., George, I.M., Porquet, D., Nandra, K., Dovciak, M.: Astron. Astrophys. 453(1), 13 (2006). https://doi.org/10.1051/0004-6361:20065276. astro-ph/0605130
Miniutti, G., Ponti, G., Greene, J.E., Ho, L.C., Fabian, A.C., Iwasawa, K.: Mon. Not. R. Astron. Soc. 394(1), 443 (2009). https://doi.org/10.1111/j.1365-2966.2008.14334.x. 0812.1652
Mitsuda, K., Inoue, H., Koyama, K., Makishima, K., Matsuoka, M., Ogawara, Y., Shibazaki, N., Suzuki, K., Tanaka, Y., Hirano, T.: Publ. Astron. Soc. Jpn. 36, 741 (1984)
Novikov, I.D., Thorne, K.S.: In: Black Holes (Les Astres Occlus), p. 343 (1973)
Pal, M., Dewangan, G.C., Misra, R., Pawar, P.K.: Mon. Not. R. Astron. Soc. 457, 875 (2016). https://doi.org/10.1093/mnras/stw009. 1601.00503
Petrucci, P.-O., Ursini, F., De Rosa, A., Bianchi, S., Cappi, M., Matt, G., Dadina, M., Malzac, J.: Astron. Astrophys. 611, 59 (2018). https://doi.org/10.1051/0004-6361/201731580. 1710.04940
Piconcelli, E., Jimenez-Bailón, E., Guainazzi, M., Schartel, N., Rodríguez-Pascual, P.M., Santos-Lleó, M.: Astron. Astrophys. 432(1), 15 (2005). https://doi.org/10.1051/0004-6361:20041621. astro-ph/0411051
Pounds, K.A., Warwick, R.S., Culhane, J.L., de Korte, P.A.J.: Mon. Not. R. Astron. Soc. 218, 685 (1986). https://doi.org/10.1093/mnras/218.4.685
Reeves, J., Done, C., Pounds, K., Terashima, Y., Hayashida, K., Anabuki, N., Uchino, M., Turner, M.: Mon. Not. R. Astron. Soc. 385(1), 108 (2008). https://doi.org/10.1111/j.1745-3933.2008.00443.x. 0801.1587
Robinson, J.H., Bentz, M.C., Johnson, M.C., Courtois, H.M., Ou-Yang, B.: Astrophys. J. 880(2), 68 (2019). https://doi.org/10.3847/1538-4357/ab29f9. 1906.07062
Schurch, N.J., Done, C.: Mon. Not. R. Astron. Soc. 381(4), 1413 (2007). https://doi.org/10.1111/j.1365-2966.2007.12336.x. 0706.1885
Shakura, N.I., Sunyaev, R.A.: Astron. Astrophys. 500, 33 (1973)
Singh, K.P., Garmire, G.P., Nousek, J.: Astrophys. J. 297, 633 (1985). https://doi.org/10.1086/163560
Strüder, L., Briel, U., Dennerl, K., Hartmann, R., Kendziorra, E., Meidinger, N., Pfeffermann, E., Reppin, C., Aschenbach, B., Bornemann, W., Bräuninger, H., Burkert, W., Elender, M., Freyberg, M., Haberl, F., Hartner, G., Heuschmann, F., Hippmann, H., Kastelic, E., Kemmer, S., Kettenring, G., Kink, W., Krause, N., Müller, S., Oppitz, A., Pietsch, W., Popp, M., Predehl, P., Read, A., Stephan, K.H., Stötter, D., Trümper, J., Holl, P., Kemmer, J., Soltau, H., Stötter, R., Weber, U., Weichert, U., von Zanthier, C., Carathanassis, D., Lutz, G., Richter, R.H., Solc, P., Böttcher, H., Kuster, M., Staubert, R., Abbey, A., Holland, A., Turner, M., Balasini, M., Bignami, G.F., La Palombara, N., Villa, G., Buttler, W., Gianini, F., Lainé, R., Lumb, D., Dhez, P.: Astron. Astrophys. 365, 18 (2001). https://doi.org/10.1051/0004-6361:20000066
Tanaka, Y., Nandra, K., Fabian, A.C., Inoue, H., Otani, C., Dotani, T., Hayashida, K., Iwasawa, K., Kii, T., Kunieda, H., Makino, F., Matsuoka, M.: Nature 375(6533), 659 (1995). https://doi.org/10.1038/375659a0
Tripathi, S., Waddell, S.G.H., Gallo, L.C., Welsh, W.F., Chiang, C.-Y.: Mon. Not. R. Astron. Soc. 488(4), 4831 (2019). https://doi.org/10.1093/mnras/stz1988. 1907.07048
Turner, M.J.L., Abbey, A., Arnaud, M., Balasini, M., Barbera, M., Belsole, E., Bennie, P.J., Bernard, J.P., Bignami, G.F., Boer, M., Briel, U., Butler, I., Cara, C., Chabaud, C., Cole, R., Collura, A., Conte, M., Cros, A., Denby, M., Dhez, P., Di Coco, G., Dowson, J., Ferrando, P., Ghizzardi, S., Gianotti, F., Goodall, C.V., Gretton, L., Griffiths, R.G., Hainaut, O., Hochedez, J.F., Holland, A.D., Jourdain, E., Kendziorra, E., Lagostina, A., Laine, R., La Palombara, N., Lortholary, M., Lumb, D., Marty, P., Molendi, S., Pigot, C., Poindron, E., Pounds, K.A., Reeves, J.N., Reppin, C., Rothenflug, R., Salvetat, P., Sauvageot, J.L., Schmitt, D., Sembay, S., Short, A.D.T., Spragg, J., Stephen, J., Strüder, L., Tiengo, A., Trifoglio, M., Trümper, J., Vercellone, S., Vigroux, L., Villa, G., Ward, M.J., Whitehead, S., Zonca, E.: Astron. Astrophys. 365, 27 (2001). https://doi.org/10.1051/0004-6361:20000087. astro-ph/0011498
Walter, R., Fink, H.H.: Astron. Astrophys. 274, 105 (1993)
Walton, D.J., Nardini, E., Fabian, A.C., Gallo, L.C., Reis, R.C.: Mon. Not. R. Astron. Soc. 428(4), 2901 (2013). https://doi.org/10.1093/mnras/sts227. 1210.4593
Wilms, J., Allen, A., McCray, R.: Astrophys. J. 542(2), 914 (2000). https://doi.org/10.1086/317016. astro-ph/0008425
Zdziarski, A.A., Johnson, W.N., Magdziarz, P.: Mon. Not. R. Astron. Soc. 283(1), 193 (1996). https://doi.org/10.1093/mnras/283.1.193. astro-ph/9607015
Życki, P.T., Done, C., Smith, D.A.: Mon. Not. R. Astron. Soc. 309(3), 561 (1999). https://doi.org/10.1046/j.1365-8711.1999.02885.x. astro-ph/9904304
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This work made use of data supplied by the XMM-Newton Science Archive and the UK Swift Science Data Centre at the University of Leicester. The anonymous referee is appreciated for useful comments that improved the quality of the manuscript.
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Adegoke, O.K. XMM-Newton and Swift observations of the Seyfert 1 AGN NGC 5940. Astrophys Space Sci 367, 51 (2022). https://doi.org/10.1007/s10509-022-04082-1
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DOI: https://doi.org/10.1007/s10509-022-04082-1