Photometric distances to NGC 628 and its four
companions

Шарина, М. Е.; Караченцев, И. Д.; Тихонов, Н. А.

doi:10.1051/aas:1996262

Cited by 97 publications

(104 citation statements)

References 16 publications

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“…Given the 80% coverage of the survey region by the shallow Table 1. Possible members of the NGC 6946 group HI masses are calculated based on the assumption that all galaxies lie at the same distance as NGC 6946 (6 Mpc, Sharina, Karachentsev & Tikhonov 1997). The HI mass of NGC 6946 is based on the mean of the six flux entries in LEDA which are corrected for the beam-filling effect.…”

Section: Resultsmentioning

confidence: 99%

Galaxies Detected by the Dwingeloo Obscured Galaxies Survey

Rivers

Henning

Kraan-Korteweg

1999

Publ. – Astron. Soc. Aust

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Abstract:The Dwingeloo Obscured Galaxies Survey (DOGS) is a 21-cm blind survey for galaxies hidden in the northern 'Zone of Avoidance' (ZOA): the portion of the optical extragalactic sky which is obscured by dust in the Milky Way. Like the Parkes southern hemisphere ZOA survey, the DOGS project is designed to reveal hidden dynamically important nearby galaxies and to help 'fill in the blanks' in the local large scale structure. To date, 36 galaxies have been detected by the Dwingeloo survey; 23 of these were previously unknown [no corresponding sources recorded in the NASA Extragalactic Database (NED)]. Among the interesting detections are three nearby galaxies in the vicinity of NGC 6946 and 11 detections in the Supergalactic plane crossing region. VLA follow-up observations have been conducted for several of the DOGS detections.

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Section: Resultsmentioning

confidence: 99%

Galaxies Detected by the Dwingeloo Obscured Galaxies Survey

Rivers

Henning

Kraan-Korteweg

1999

Publ. – Astron. Soc. Aust

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“…The spectra show Hα emission over the whole extent of the field, ∼110 -130 long (depending on the PA of the slit), which is 3.2 to 3.8 kpc for a distance to NGC 6946 of 6.0 Mpc (Sharina et al 1997). • and 29…”

Section: The Velocity Distribution From the 6-m Telescope Datamentioning

confidence: 98%

6-m telescope spectroscopic observations of the bubble complex in NGC 6946

Efremov

Pustilnik

Kniazev

et al. 2002

A&A

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Abstract. We describe the results of a long-slit spectroscopic study of an unusual star complex in the nearby spiral galaxy NGC 6946 using the SAO 6 m telescope and the Keck 10 m telescope. The complex resembles a circular bubble 600 pc in diameter with a young super star cluster (SSC) near the center. The kinematics of ionized gas is studied through Hα emission with several slit positions. Position-velocity diagrams show two distinct features with high speed motions. One is an irregularly shaped region to the east of the SSC, 270 pc in size, in which most of the Hα emission is blue shifted by 120 km s −1 , and another is a 350 pc shell centered on the SSC with positive and negative velocity shifts of 60 km s −1 . Balmer and He i absorption lines in the SSC give an age of 12-13 Myr, which is consistent with the photometric age but significantly older than the kinematic ages of the high speed regions. The energetics of the SSC and its interaction with the environment are considered. The expansion energies exceed 10 52 ergs, but the power outputs from winds and supernova in the SSC are large enough to account for this. The intensities of Balmer, [N ii], and [S ii] emission lines within and around the complex indicate that shock excitation makes a significant contribution to the emission from the most energetic region.

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“…More recently, Sharina et al (1999) derived a distance of 6.9 +1.4 −1.2 Mpc based on the magnitudes of its brightest resolved stars.…”

Section: The Ic 2233 and Ngc 2537 Fieldmentioning

confidence: 99%

H I Imaging Observations of Superthin Galaxies. Ii. Ic 2233 and the Blue Compact Dwarf NGC 2537

Matthews

Uson

2007

The Astronomical Journal

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We have used the Very Large Array to image the H i 21 cm line emission in the edge-on Sd galaxy IC 2233 and the blue compact dwarf NGC 2537. We also present new optical B, R, and Hα imaging of IC 2233 obtained with the WIYN telescope. Despite evidence of localized massive star formation in the form of prominent H ii regions and shells, supergiant stars, and a blue integrated color, IC 2233 is a low surface brightness system with a very low global star formation rate ( 0.05 M yr −1 ), and we detect no significant 21 cm radio continuum emission from the galaxy. The H i and ionized gas disks of IC 2233 are clumpy and vertically distended, with scale heights comparable to that of the young stellar disk. Both the stellar and H i disks of IC 2233 appear flared, and we also find a vertically extended, rotationally anomalous component of H i extending to ∼ 2.4d 10 kpc from the midplane. The H i disk exhibits a mild lopsidedness as well as a global corrugation pattern with a period of ∼7d 10 kpc and an amplitude of ∼150d 10 pc. To our knowledge, this is the first time corrugations of the gas disk have been reported in an external galaxy; these undulations may be linked to bending instabilities or to underlying spiral structure and suggest that the disk is largely self-gravitating. Lying at a projected distance of 16 .7 from IC 2233, NGC 2537 has an H i disk with a bright, tilted inner ring and a flocculent, dynamically cold outer region that extends to ∼3.5 times the extent of the stellar light (D 25 ). Although NGC 2537 is rotationally-dominated, we measure H i velocity dispersions as high as σ V ,H i ∼ 25 km s −1 near its center, indicative of significant turbulent motions. The inner rotation curve rises steeply, implying a strong central mass concentration. Our data indicate that IC 2233 and NGC 2537 do not constitute a bound pair and most likely lie at different distances. We also find no compelling evidence of a recent minor merger in either IC 2233 or NGC 2537, suggesting that both are examples of small disk galaxies evolving in relative isolation.

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Photometric distances to NGC 628 and its four companions

Cited by 97 publications

References 16 publications

Galaxies Detected by the Dwingeloo Obscured Galaxies Survey

Galaxies Detected by the Dwingeloo Obscured Galaxies Survey

6-m telescope spectroscopic observations of the bubble complex in NGC 6946

H I Imaging Observations of Superthin Galaxies. Ii. Ic 2233 and the Blue Compact Dwarf NGC 2537

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