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J/ApJ/588/824     Velocities of blue stars near (l,b)=(198,-27)   (Yanny+, 2003)

A low-latitude halo stream around the Milky way. Yanny B., Newberg H.J., Grebel E.K., Kent S., Odenkirchen M., Rockosi C.M., Schlegel D., Subbarao M., Brinkmann J., Fukugita M., Ivezic Z., Lamb D.Q., Schneider D.P., York D.G. <Astrophys. J. 588, 824 (2003)> =2003ApJ...588..824Y
ADC_Keywords: Stars, halo ; Stars, blue ; Radial velocities ; Photometry, SDSS Keywords: Galaxy: halo - Galaxy: structure Abstract: We present evidence for a ring of stars in the plane of the Milky Way, extending at least from l=180° to 227° with turnoff magnitude g∼19.5; the ring could encircle the Galaxy. We infer that the low Galactic latitude structure is at a fairly constant distance of R=18±2kpc from the Galactic center above the Galactic plane and has R=20±2kpc in the region sampled below the Galactic plane. The evidence includes 500 Sloan Digital Sky Survey spectroscopic radial velocities of stars within 30° of the plane. The velocity dispersion of the stars associated with this structure is found to be 27km/s at (l, b)=(198, -27), 22km/s at (l, b)=(225, 28), 30km/s at (l, b)=(188, 24), and 30km/s at (l, b)=(182, 27). The structure rotates in the same prograde direction as the Galactic disk stars but with a circular velocity of 110±25km/s. The narrow measured velocity dispersion is inconsistent with power-law spheroid or thick-disk populations. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 95 392 Blue stars near (l,b) = (198°, -27°)
See also: http://www.sdss.org/ : SDSS Home Page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 F9.6 deg RAdeg Right Ascension in decimal degrees (J2000) 12- 20 F9.6 deg DEdeg Declination in decimal degrees (J2000) 22- 38 A17 --- SDSS-ID Identification in SDSS (1) 40- 52 A13 --- FID Fiber identification (2) 54- 59 F6.3 mag gmag The SDSS g band magnitude (3) 61- 66 F6.3 mag g-r ? The SDSS (g-r) color index (3) 69- 73 F5.3 mag u-g ? The SDSS (u-g) color index (3) 75- 80 F6.1 km/s HRV Heliocentric corrected radial velocity 82- 86 F5.2 0.1nm EWCaII Ca II K absorption line equivalent width in units of Angstroems 88 I1 --- CCut [0,1] Color cut in F-star box (4) 90- 95 F6.4 mag E(B-V) The (B-V) excess at (RAdeg,DEdeg) (5)
Note (1): In the format of run-rerun-camcol-field-id. [YNG2003] NNNN-N-N-NNN-NNNN in Simbad Note (2): In the format of plate-MJD-fiber. Note (3): Reddening corrected Note (4): Colour cut is 1 when the star is in the F-star box: 0.158<g-r<0.3, 19.1<gmag<20.3; 0 = outside box. Note (5): From Schlegel, Finkbeiner and Davis (1998ApJ...500..525S).
Table 2: Summary of Stream Detection Pieces -------------------------------------------------------------------------------- [YNG2003] RA DE l b <RV> sigma g0 (g-r)0 Vcirc -------------------------------------------------------------------------------- Sp198-27-19.8 72 0 198 -27 74 ± 5 27 19.8 0.24 -5 ± 54 Sp225+28-19.6 133 2 225 28 103 ± 6 23 19.6 0.26 139 ± 27 Sp182+27-19.4 117 38 182 27 22 ± 8 30 19.4 0.28 Sp188+24-19.3 115 32 188 24 34 ± 7 30 19.3 0.28 12 ± 200 Sag. south stream 35 0 165 -55 -111 ± 5 20 21.5 0.22 -------------------------------------------------------------------------------- Notes: Objects are identified as [YNG2003] SpLLL+BB-NN.N in Simbad g0 and (g-r)0 are Magnitude and color of faint blue Monoceros turnoff except where indicated. Sp198-27-19.8 is from plate 797. For the Sagittarius stream, <RV> and sigma refer to Sagittarius stream blue horizontal branch and blue straggler stars rather than those in the Monoceros structures. The color and magnitude are those of the Sagittarius stream. History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 31-Jul-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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