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1H 0323+342
Pan-STARRS image of 1H 0323+342
Observation data (J2000 epoch)
Constellation	Perseus
Right ascension	03 24 41.16
Declination	+34° 10′ 45.87″
Redshift	0.062900
Heliocentric radial velocity	18,857 km/s
Distance	831 Mly (254.78 Mpc)
Apparent magnitude (V)	15.72
Characteristics
Type	NLSy1
Size	59.55 kiloparsecs (194,200 light-years) (diameter; 2MASS K-band total isophote)
Notable features	Nearest gamma-ray emitting narrow-line Seyfert galaxy
Other designations
LEDA 2045127, RX J0324.6+3410, WB J0324+3410, 2MASX J03244119+3410459, B2 0321+33B, TXS 0321+340, NVSS J032441+341045

1H 0323+342 known as 2MASX J032441.19+341045.9, is a galaxy located in the constellation of Perseus. It is located 831 million light years from Earth. It is classified a gamma-ray emitting narrow-line Seyfert galaxy, the nearest known example of this subtype.

Observational history

1H 0323+342 was first discovered by Wood as an astrophysical X-ray source during the HEAO-1 X-ray survey in 1984. At the time of the observation the source had an unknown origin. In 1993, the source was confirmed as a Seyfert type 1 galaxy by Remillard and colleagues, who identified several emission-line AGNs from a further HEAO-1 X-ray survey. This galaxy has since been detected by both the Fermi Gamma-ray Space Telescope and INTEGRAL.

Characteristics

The nucleus of 1H 0323+342 is found to be active. The most likely explanation for this energy source in all active galactic nuclei is a presence of an accretion disk around a supermassive black hole. The mass of the black hole in center of 1H 0323+342 is estimated to be 10 M_ʘ based on the width and luminosity of a H_β line and empirical scaling relations, or ~ 2 x 10 M_ʘ according to multi-wavelength observations. But later studies shows the mass of the black hole has different estimates. In 2016, a similar mass of (3.4_-0.6) x 10 M_ʘ was found from a reverberation study. However, in 2024, the mass is 10 M_ʘ according to the galaxy's total flux spectrum. Additionally, the nucleus shows a quasi-stationary feature similar to a HST-1 structure inside the jet of Messier 87.

1H 0323+342 shows some characteristics of blazars, including variable fluxes in optical, radio and X-ray bands as well as a compact bright core. Moreover, the core is revealed to have a two-sided structure measuring ~ 15 kiloparsecs. The galaxy also contains a flat-spectrum radio source with a radio loudness of either R_5 GHz = 246 or R_1.4 GHz = 318. A relativistic jet is present in 1H 0323+342 although its jet power of 1.0 x 10 erg s is half the luminosity of its accretion disk.

The host galaxy of 1H 0323+342 is a mystery but it has irregular morphology. There is a peculiar structure in the galaxy. It is either interpreted as a one-armed spiral structure based from an optical image taken by Hubble Space Telescope, or a ring-like structure suggesting a recent galaxy merger.

References

1. ^ "NASA/IPAC Extragalactic Database results for 1H 0323+342". ned.ipac.caltech.edu. Retrieved 2024-10-15.
2. Foschini, Luigi; Ciroi, Stefano; Berton, Marco; Vercellone, Stefano; Romano, Patrizia; Braito, Valentina (2019-09-14). "Mapping the Narrow-Line Seyfert 1 Galaxy 1H 0323+342". Universe. 5 (9): 199. arXiv:1909.05525. Bibcode:2019Univ....5..199F. doi:10.3390/universe5090199. ISSN 2218-1997.
3. Liu, Hao; Wu, Chao; Wang, Jing; Wei, Jianyan (April 2016). "Optical monitoring observations of two γ -ray narrow-line Seyfert 1 galaxies". New Astronomy. 44: 51–57. Bibcode:2016NewA...44...51L. doi:10.1016/j.newast.2015.09.005. ISSN 1384-1076.
4. Mundo, Sergio A; Kara, Erin; Cackett, Edward M; Fabian, A C; Jiang, J; Mushotzky, R F; Parker, M L; Pinto, C; Reynolds, C S; Zoghbi, A (2020-06-18). "The origin of X-ray emission in the gamma-ray emitting narrow-line Seyfert 1 1H 0323+342". Monthly Notices of the Royal Astronomical Society. 496 (3): 2922–2931. arXiv:2006.07537. doi:10.1093/mnras/staa1744. ISSN 0035-8711.
5. Turner, Clay S; Miller, Hugh R; Maune, Jeremy D; Eggen, Joseph R (2022-10-03). "Optical variability of the very radio-loud narrow line Seyfert 1 galaxy, 1H 0323+342". Monthly Notices of the Royal Astronomical Society. 517 (3): 3257–3262. arXiv:2209.13066. doi:10.1093/mnras/stac2805. ISSN 0035-8711.
6. Wood, K. S.; Meekins, J. F.; Yentis, D. J.; Smathers, H. W.; McNutt, D. P.; Bleach, R. D.; Byram, E. T.; Chupp, T. A.; Friedman, H.; Meidav, M. (1984-12-01). "The HEAO A-1 X-ray source catalog". The Astrophysical Journal Supplement Series. 56: 507–649. Bibcode:1984ApJS...56..507W. doi:10.1086/190992. ISSN 0067-0049.
7. Remillard, R. A.; Bradt, H. V. D.; Brissenden, R. J. V.; Buckley, D. A. H.; Roberts, W.; Schwartz, D. A.; Stroozas, B. A.; Tuohy, I. R. (June 1993). "Twenty-two emission-line AGNs from the HEAO-1 X-ray survey". The Astronomical Journal. 105 (6): 2079–2089. Bibcode:1993AJ....105.2079R. doi:10.1086/116585. ISSN 0004-6256.
8. ^ Paliya, Vaidehi S.; Sahayanathan, S.; Parker, M. L.; Fabian, A. C.; Stalin, C. S.; Anjum, Ayesha; Pandey, S. B. (2014-06-24). "The Peculiar Radio-Loud Narrow Line Seyfert 1 Galaxy 1H 0323+342". The Astrophysical Journal. 789 (2): 143. arXiv:1405.0715. Bibcode:2014ApJ...789..143P. doi:10.1088/0004-637x/789/2/143. ISSN 0004-637X.
9. Pan, Hai-Wu; Yuan, Weimin; Yao, Su; Komossa, S.; Jin, Chichuan (2018-10-10). "Independent Estimation of Black Hole Mass for the γ-ray-detected Archetypal Narrow-line Seyfert 1 Galaxy 1H 0323+342 from X-Ray Variability". The Astrophysical Journal. 866 (1): 69. arXiv:1807.01002. Bibcode:2018ApJ...866...69P. doi:10.3847/1538-4357/aadd4a. ISSN 0004-637X.
10. ^ Doi, Akihiro; Hada, Kazuhiro; Kino, Motoki; Wajima, Kiyoaki; Nakahara, Satomi (2018-04-10). "A Recollimation Shock in a Stationary Jet Feature with Limb-brightening in the Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxy 1H 0323+342". The Astrophysical Journal Letters. 857 (1): L6. arXiv:1804.03776. Bibcode:2018ApJ...857L...6D. doi:10.3847/2041-8213/aabae2. ISSN 2041-8205.
11. Jose, Jincen; Rakshit, Suvendu; Panda, Swayamtrupta; Woo, Jong-Hak; Stalin, C S; Neha, Sharma; Pandey, Shivangi (2024-07-11). "Spectropolarimetric view of the gamma-ray emitting NLS1 1H0323 + 342". Monthly Notices of the Royal Astronomical Society. 532 (3): 3187–3197. arXiv:2407.06761. doi:10.1093/mnras/stae1691. ISSN 0035-8711.
12. ^ Zhou, Hongyan; Wang, Tinggui; Yuan, Weimin; Shan, Hongguang; Komossa, Stefanie; Lu, Honglin; Liu, Yi; Xu, Dawei; Bai, J. M.; Jiang, D. R. (2007-02-15). "A Narrow-Line Seyfert 1-Blazar Composite Nucleus in 2MASX J0324+3410". The Astrophysical Journal. 658 (1): L13 – L16. arXiv:astro-ph/0702329. Bibcode:2007ApJ...658L..13Z. doi:10.1086/513604. ISSN 0004-637X.
13. Yao, Su; Yuan, Weimin; Komossa, S.; Grupe, Dirk; Fuhrmann, L.; Liu, Bifang (2015-06-30). "THEγ-RAY DETECTED NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342:SWIFTMONITORING ANDSUZAKUSPECTROSCOPY". The Astronomical Journal. 150 (1): 23. arXiv:1505.01269. Bibcode:2015AJ....150...23Y. doi:10.1088/0004-6256/150/1/23. ISSN 1538-3881.
14. León Tavares, J.; Kotilainen, J.; Chavushyan, V.; Añorve, C.; Puerari, I.; Cruz-González, I.; Patiño-Alvarez, V.; Antón, S.; Carramiñana, A.; Carrasco, L.; Guichard, J.; Karhunen, K.; Olguín-Iglesias, A.; Sanghvi, J.; Valdes, J. (2014-10-14). "The Host Galaxy of the Gamma-Ray Narrow-Line Seyfert 1 Galaxy 1H 0323+342". The Astrophysical Journal. 795 (1): 58. arXiv:1409.2518. Bibcode:2014ApJ...795...58L. doi:10.1088/0004-637x/795/1/58. ISSN 1538-4357.
15. Antón, S.; Browne, I. W. A.; Marchã, M. J. (2008-08-25). "The colour of the narrow line Sy1-blazar 0324+3410". Astronomy & Astrophysics. 490 (2): 583–587. arXiv:0907.2400. Bibcode:2008A&A...490..583A. doi:10.1051/0004-6361:20078926. ISSN 0004-6361.

External links

• 1H 0323+342 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• 1H 0323+342 on SIMBAD

v t e Constellation of Perseus
List of stars in Perseus Perseus in Chinese astronomy
Stars	Bayer α (Mirfak) β (Algol) γ δ ε ζ η (Miram) θ ι κ (Misam) λ μ ν ξ (Menkib) ο (Atik) π (Gorgonea Secunda) ρ (Gorgonea Tertia) σ τ φ ψ ω (Gorgonea Quarta) b Flamsteed 1 2 3 4 (g) 5 7 8 9 (i) 10 11 12 14 16 17 20 21 24 29 30 31 32 (l) 34 36 40 (o) 42 (n) 43 (A) 48 (c) 49 50 52 (f) 53 (d) 54 55 56 57 (m) 58 (e) 59 1 Aur Variable S T U V X Z RS RT RV RW RY ST SU SV TZ UV UX UY VX XX XY XZ YZ AB AG AR AS AW AX BM DM DY FO GK IK IP IQ IU IW IX IZ KP KS KT KW LX V351 V356 V357 V361 V376 V380 V386 V392 V396 V400 V423 V432 V440 V459 V461 V471 V472 V473 V480 V488 V490 V492 V505 V509 V518 V520 (61 And) V521 V545 V551 V572 V573 V575 V576 V621 V718 V1024 HR 470 526 529 538 540 621 641 787 792 810 820 831 842 846 849 864 865 876 885 886 890 894 918 (k) 920 923 930 949 950 956 964 966 969 973 975 979 986 991 1001 1019 1034 1037 1041 1047 1051 1056 1059 1074 1097 1113 1127 1130 1133 1141 1160 1164 1176 1191 1197 1198 1207 1215 1226 1234 1286 1301 1330 1333 1337 1344 1371 1390 1419 1424 1482 1489 1493 1500 1514 HD 13519 14433 14434 16691 16760 17092 17245 17605 21684 22781 23301 23596 25329 26702 29587 Other BD+31 643 BD+48 740 G 38-29 G 95-57 GD 61 HAT-P-15 (Berehynia) HAT-P-29 (Muspelheim) IRAS 04296+3429 L1448-IRS2E LkHα 101 LRLL 54361 NGC 1333 13 NGC 1333 IRAS 2A NGC 1333 IRAS 4A NGC 1333 IRAS 4B NGC 1624-2 PSR B0355+54 PSR J0357+3205 WR 4
Exoplanets WASP-11b/HAT-P-10b
Star clusters	NGC 869 (h) 884 (χ) 957 1039 1220 1285 1342 1444 1513 1528 1545 1624 Other Alpha Persei Cluster IC 348 Trumpler 2
Nebulae	NGC 650 (Little Dumbbell Nebula) 1333 1491 1499 (California Nebula) 1579 Other Barnard 203 Wreath Nebula
Galaxies	NGC 1003 1023 1058 1077 1086 1159 1160 1161 1167 1169 1175 (Peanut Galaxy) 1198 1250 1259 1260 1264 1265 1267 1268 1270 1271 1272 1273 1274 1275 1277 1278 1279 1281 1282 1283 1293 1294 1334 Other 1H 0323+342 IC 310 NRAO 140 UGC 2885 (Godzilla galaxy) 4C +37.11
Galaxy clusters Perseus Cluster
Astronomical events SN 2006gy Perseids
Category

• 2MASS objects
• Perseus (constellation)
• LEDA objects
• Blazars
• Seyfert galaxies
• Astronomical objects discovered in 1984