TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. II. CEP A AND NGC 7538

By L. Moscadelli, M. J. Reid, K. Menten, A. Brunthaler, X. Zheng, Ye Xu. 2008

144 citations recorded by the source corpus.

We report trigonometric parallaxes for the sources NGC 7538 and Cep A, corresponding to distances of 2.65+0.12−0.11 and 0.70+0.04−0.04 kpc, respectively. The distance to NGC 7538 is considerably smaller than its kinematic distance and places it in the Perseus spiral arm. The distance to Cep A is also smaller than its kinematic distance and places it in the “Local” arm or spur. Combining the distance and proper motions with observed radial velocities gives the location and full space motion of the star-forming regions. We find significant deviations from circular galactic orbits for these sources: both sources show large peculiar motions (greater than 10 km s−1) counter to galactic rotation and NGC 7538 has a comparable peculiar motion toward the Galactic center.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/0a239c556c4ac77223e2e316f56d95abdbbf189b

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In Astronomy and Astrophysics

1. M. J. Reid
2. K. Menten
3. M. Honma
4. P. McMillan
5. A. Brunthaler
6. Simon Bruderer
7. T. Pillai
8. F. Wyrowski

Citations in the corpus

• THE WISE CATALOG OF GALACTIC H ii REGIONS (2013, unknown): “…et al. 2011; (15) Immer et al. 2013; (16) Jones & Dickey 2012; (17) Kurayama et al. 2011; (18) Menten et al. 2007; (19) Moellenbrock et al. 2009; (20) Moscadelli et al. 2009; (21) Niinuma et al. 2011; (22) Oh et al. 2010; (23) Reid et al. 2009a; (24) Reid et al. 2009c; (25) Rygl et al. 2010;…”
• Parallaxes and proper motions of interstellar masers toward the Cygnus X star-forming complex. I. Membership of the Cygnus X region (2011, background): “(Moscadelli et al. 2009), L 1206 (Rygl et al. 2010), L 1448C (Hirota et al. 2011), Cygnus X-1 (located∼7◦ away from the Cygnus X region, Reid et al. 2011), ON 1 (Rygl et al. 2010; Nagayama et al. 2011), and G 59.7+01 (Xu et al. 2009a).”
• Fundamental Parameters of the Milky Way Galaxy Based on VLBI Astrometry (2012, unknown): “…Hirota et al. 2011, (11) Honma et al. 2007, (12) Imai et al. 2007, (13) Kim et al. 2008, (14) Loinard et al. 2007, (15) Loinard et al. 2008, (16) Moellenbrock et al. 2009, (17) Moscadelli et al. 2009, (18) Moscadelli et al. 2011, (19) Motogi et al. 2011, (20) Nagayama et al. 2011a, (21)…”
• The Hα surface brightness–radius relation: a robust statistical distance indicator for planetary nebulae (2015, unknown): “…G68 – Gebel (1968); GC94 – Garnett & Chu (1994); GM98 – Grosdidier et al. (1998); H78 – Humphreys (1978); H03 – Hewett et al. (2003); H07 – Harris et al. (2007); HH01 – Herald et al. (2001); HL92 – Hoekzema et al. (1992); IM83 – Isserstedt et al. (1983); K98 – Kimeswenger (1998); KB10 – Kamohara…”
• TRIGONOMETRIC PARALLAXES OF HIGH MASS STAR FORMING REGIONS: THE STRUCTURE AND KINEMATICS OF THE MILKY WAY (2014, unknown): “…et al. (20110(@), 25:Rygl et al. (2012), 26:Zhang et al. (2012b), 27:Hachisuka et al. (2014), 28:Choi et al. (2014), 29:Hirota et al. (2008), 30:Moscadelli et al. (2009), 31:Moellenbrock, Claussen & Goss (2009), 32:Sato et al. (2008), 33:Xu et al. (2006), 34:Hachisuka et al. (2006), 35:Asaki…”
• HERSCHEL SURVEY OF GALACTIC OH+, H2O+, AND H3O+: PROBING THE MOLECULAR HYDROGEN FRACTION AND COSMIC-RAY IONIZATION RATE (2014, background): “The hyper-compact H ii region NGC 7538 IRS1 is 2.65 kpc distant as determined via trigonometric parallax of CH3OH masers (Moscadelli et al. 2009) and has a systemic velocity of −59 km s−1 observed in several molecules (Zhu et al. 2013).”
• TADPOL: A 1.3 mm SURVEY OF DUST POLARIZATION IN STAR-FORMING CORES AND REGIONS (2013, background): “NGC 7538 IRS 1 The hyper-compact H II region NGC 7538 IRS 1 was first discovered in a 2µm and 20µm survey of NGC 7538 (Wynn-Williams et al. 1974), which lies at a distance of 2.65 kpc (Moscadelli et al. 2009).”
• TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. VI. GALACTIC STRUCTURE, FUNDAMENTAL PARAMETERS, AND NONCIRCULAR MOTIONS (2009, methodology): “…for 12 GHz methanol (CH3OH) masers toward 10 HMSFRs, carried out with the VLBA (program BR100), are reported in the first five papers in this series (Reid et al. 2009; Moscadelli et al. 2009; Xu et al. 2009; Zhang et al. 2009; Brunthaler et al. 2009), hereafter Papers I through V, respectively.”
• TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. I. S 252 & G232.6+1.0 (2008, background): “This paper is the first (Paper I) in a series, including Papers II through V (Moscadelli et al. 2009; Xu et al. 2009; Zhang et al. 2009; Brunthaler et al. 2009) published in this volume.”