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NRAO 140
The quasar NRAO 140.
Observation data (J2000.0 epoch)
Constellation	Perseus
Right ascension	03 36 30.1076
Declination	+32° 18′ 29.342″
Redshift	1.265200
Heliocentric radial velocity	379,297 km/s
Distance	8.432 Gly
Apparent magnitude (V)	17.50
Characteristics
Type	Opt. var, LPQ, RLQ
Other designations
INTREF 154, LEDA 2820229, QSO J0336+3218, OHIO E 355, 2E 801, 1H 0332+317, 4C 32.14, DA 107, RX J0336.5+3218

NRAO 140 is a quasar located in the constellation of Perseus, noted for its low frequency variability. It has a redshift of (z) 1.258, first discovered in 1973 by Duncan Agnew and Halton Arp as an astronomical radio source, whom they catalogued it as 4C 32.14.

Description

NRAO 140 is classified as a radio-selected blazar (RBL) based on European X-ray Observatory Satellite (EXOSAT) observations. However the object has no presence of either long-term or rapid fluxes. Its radio spectrum is flat, making it a flat-spectrum source, but also exhibiting radio and X-ray fluxes that lasted between 1979 and 1985. The brightness temperature of NRAO 140 is estimated to be between 5 x 10 and 5 x 10 Kelvin.

A low frequency outburst was detected in NRAO 140 by the Very Long Baseline Array (VLBI) observations, peaking in 1981 with the component undergoing a decrease in brightness levels as the outburst faded. Between August 7 and 9 in 1986, the object displayed rising levels in K flux from 1.25 ± 0.06 mJy to around 1.54 ± 0.05 mJy in a span of two days during the observation campaign.

Radio imaging made by Very Large Array (VLA) at both 21 and 6 centimeters (cm) shows the structure of NRAO 140 is made up of only a single secondary component with a position angle of 150°. Other radio images made by the Westerbork Synthesis Radio Telescope shows NRAO 140 has two components located on both sides of the radio core, consisting of a southwestern component at a position angle of 149° and a northeastern component at a position angle of -31° opposed to images made by VLA. VLBI observations also shows evidence of superluminal motion in several components separating at an angular rate of 0.10-0.14 milliarcseconds.

The jet in NRAO 140 is found to bend slightly towards the south direction from the radio core with detections of polarized flux in its jet components. In additional, the position angle of the jet is found nearly perpendicular towards the jet's axis, with the jet itself having a faraday rotation measure gradient extended by 8 milliarcseconds from the core. By constraining the upper limits of the jet's viewing angle, the jet is confirmed to have a linear extent greater than 350 parsecs.

References

1. ^ Courvoisier, T.J.; Bell-Burnell, J.; Blecha, A. (1986). "Optical and infrared study of the three quasars OX 169, NRAO 140 and 3C 446". Astronomy & Astrophysics. 169 (1–2): 43–48. Bibcode:1986A&A...169...43C. ISSN 0004-6361.
2. Fey, Alan L.; Clegg, Andrew W.; Fiedler, Ralph L. (September 1996). "VLBI Observations of Eight Extreme Scattering Event Sources: Milliarcsecond-Scale Structure". The Astrophysical Journal. 468: 543. Bibcode:1996ApJ...468..543F. doi:10.1086/177713. ISSN 0004-637X.
3. Maisack, M.; Staubert, R.; Otterbein, K.; Witzel, A.; Wagner, S.J.; Heines, A. (1996). "CGRO, radio and optical observations of the quasar NRAO 140". Astronomy and Astrophysics Supplement Series. 120: 533–536. arXiv:astro-ph/9609002. Bibcode:1996A&AS..120C.533M.
4. Marscher, Alan P.; Broderick, John J. (1982), Heeschen, David S.; Wade, Campbell M. (eds.), "Superluminal Motion in NRAO 140 and a Possible Future Method for Constraining Ho and qo", Extragalactic Radio Sources, Dordrecht: Springer Netherlands, pp. 359–360, doi:10.1007/978-94-009-7781-5_99, ISBN 978-94-009-7781-5, retrieved 2024-12-28
5. Agnew, Duncan; Arp, Halton (April 1973). "A List of Quasi-Stellar Radio Sources and Quasi-Stellar Radio Source Candidates from the 3C and 4C Catalogs Between Declination -7° and +40°". Publications of the Astronomical Society of the Pacific. 85 (504): 162. Bibcode:1973PASP...85..162A. doi:10.1086/129427. ISSN 0004-6280.
6. Mufakharov, T.; Mingaliev, M.; Sotnikova, Yu.; Naiden, Ya.; Erkenov, A. (2015-05-07). "The observed radio/gamma-ray emission correlation for blazars with the Fermi-LAT and the RATAN-600 data". Monthly Notices of the Royal Astronomical Society. 450 (3): 2658–2669. doi:10.1093/mnras/stv772. ISSN 0035-8711.
7. Ghosh, K.K.; Soundararajaperumal, S. (1995). "Multifrequency Spectra of EXOSAT Blazars". The Astrophysical Supplement Series. 100: 37–68. Bibcode:1995ApJS..100...37G. doi:10.1086/192207.
8. Marscher, A. P.; Broderick, J. J. (March 1985). "Multifrequency radio VLBI observations of the superluminal low-frequency variable quasar NRAO 140". The Astrophysical Journal. 290: 735. Bibcode:1985ApJ...290..735M. doi:10.1086/163031. ISSN 0004-637X.
9. P. Marsche, Alan; J. Broderick, John; Padrielli, Lucia; Bartel, Norbert; D. Romney, Jonathan (1987). "18 centimeter VLBI observations of the quasar NRAO 140 during and after a low-frequency outburst". The Astrophysical Journal. 319: 456–464. Bibcode:1987ApJ...319..456M. doi:10.1086/165470.
10. Marscher, A.P. (1987). "5 years of VLBI and X-ray observations of NRAO 140". The Impact of VLBI on Astrophysics and Geophysics; Proceedings of the 129th IAU Symposium, Cambridge, MA, May 10-15, 1987. 129: 35–36. Bibcode:1988IAUS..129...35M.
11. Altschuler, D.R.; Gurvits, L.I.; Alef, W.; Dennison, B.; Graham, D.; Trotter, A.S. (1995). "The centi-arcsecond structure of 16 low-frequency variable sources at 92 cm". Astronomy and Astrophysics Supplement Series. 114: 197–114. Bibcode:1995A&AS..114..197A.
12. Marscher, A. P.; Broderick, J. J. (April 1982). "Apparent superluminal motion in the quasar NRAO 140". The Astrophysical Journal. 255: L11. Bibcode:1982ApJ...255L..11M. doi:10.1086/183760. ISSN 0004-637X.
13. Asada, Keiichi; Inoue, Makoto; Nakamura, Masanori; Kameno, Seiji; Nagai, Hiroshi (August 2008). "Multifrequency Polarimetry of the NRAO 140 Jet: Possible Detection of a Helical Magnetic Field and Constraints on Its Pitch Angle". The Astrophysical Journal. 682 (2): 798–802. arXiv:0806.4233. Bibcode:2008ApJ...682..798A. doi:10.1086/588573. ISSN 0004-637X.

External links

• NRAO 140 by SIMBAD
• NRAO 140 by NASA/IPAC Database

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 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

• Quasars
• Perseus (constellation)
• Blazars
• Active galaxies
• Astronomical objects discovered in 1973
• LEDA objects
• 4C objects