J/AJ/139/1413 M81 star cluster candidates (Nantais+, 2010)
Star cluster candidates in M81. Nantais J.B., Huchra J.P., McLeod B., Strader J., Brodie J.P. <Astron. J., 139, 1413-1425 (2010)> =2010AJ....139.1413N
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry Keywords: galaxies: individual (M81) - galaxies: spiral - galaxies: star clusters: general - galaxies: stellar content Abstract: We present a catalog of extended objects in the vicinity of M81 based on a set of 24 Hubble Space Telescope Advanced Camera for Surveys Wide Field Camera F814W (I-band) images. We have found 233 good globular cluster (GC) candidates; 92 candidate HII regions, OB associations, or diffuse open clusters; 489 probable background galaxies; and 1719 unclassified objects. We have color data from ground-based g- and r-band MMT Megacam images for 79 galaxies, 125 GC candidates, 7 HII regions, and 184 unclassified objects. The color-color diagram of GC candidates shows that most fall into the range 0.25<g-r<1.25 and 0.5<r-I<1.25, similar to the color range of Milky Way GCs. Unclassified objects are often blue, suggesting that many of them are likely to be HII regions and open clusters, although a few galaxies and GCs may be among them. Description: Our primary data are a set of 24 HST ACS Wide Field Camera (WFC) F814W (I-band) images taken between 2004 September 16 and 2005 September 7, most with total exposures of 1650s, from HST Proposal No. 10250. In addition, we have also obtained MMT Megacam g and r images of M81 taken 2006 June 5, with 900s exposure time each. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 84 2533 Object list table2.dat 83 2533 Photometry of extended objects
See also: J/AJ/109/1055 : Globulars of M81 (Perelmuter+ 1995) J/ApJ/438/181 : Observations of H II Regions in M81 (Hill+ 1995) J/AJ/122/1330 : HST BVI photometry of M 81 star clusters (Chandar+, 2001) J/MNRAS/405/1293 : Compact star clusters in M81 (Santiago-Cortes+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID [1/2533] Running index identification number, <[NHM2010] NNNN> in Simbad 6- 7 I2 h RAh Hour of Right Ascension (J2000) 9- 10 I2 min RAm Minute of Right Ascension (J2000) 12- 16 F5.2 s RAs Second of Right Ascension (J2000) 18 A1 --- DE- Sign of Declination (J2000) 19- 20 I2 deg DEd Degree of Declination (J2000) 22- 23 I2 arcmin DEm Arcminute of Declination (J2000) 25- 29 F5.2 arcsec DEs Arcsecond of Declination (J2000) 31- 34 F4.2 arcsec FWHM Full-Width at Half-Maximum 36- 39 F4.2 --- Elong [1/6] Elongation (b/a) 41- 45 I5 --- PR ? Closest Perelmuter and Racine (1995, Cat. J/AJ/109/1055) object 46 A1 --- u_PR [?] Uncertainty flag on PR 48- 50 I3 --- CFT ? Closest Chandar, Ford, and Tsvetanov (2001, Cat. J/AJ/122/1330) object 51- 53 A3 --- n_CFT [(b) ] Note on CFT (unexplained) 55- 67 A13 --- Spec Spectroscopic match (1) 69- 79 A11 --- Type Source type: GC cand, Galaxy, Galaxy+Star, HII/OB or Other 81- 84 F4.2 arcsec Off ? Megacam offset
Note (1): From Perelmuter, Brodie, and Huchra (1995AJ....110..620P) for IDs with 5 digits (<[PR95] NNNNN>), or Schroder et al. (2002AJ....123.2473S) if preceded by SBKHP (<SBKHP NN>).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID [1/2533] Running index identification number, <[NHM2010] NNNN> in Simbad 6- 11 F6.3 mag Imag ? I band magnitude 13- 17 F5.3 mag e_Imag ? The 1σ error in Imag 19- 24 F6.3 mag r-I ? The (r-I) color index 26- 30 F5.3 mag e_r-I ? The 1σ error in r-I 32- 37 F6.3 mag g-r ? The (g-r) color index 39- 43 F5.3 mag e_g-r ? The 1σ error in g-r 45- 48 F4.2 arcsec Rad ? HST radius 50- 58 A9 --- Note HST sky annulus note (2) 60- 63 F4.2 arcsec SkyIn ? Inner boundary of sky annulus for colors (2) 65- 68 F4.2 arcsec SkyWid ? Width of sky annulus for colors (2) 70- 83 A14 --- Color Color note (3)
Note (2): annuli are used for the determination of the sky background. If the HST sky annulus is different from the standard size chosen for the photometry radius, then the inner radius and width of the sky annulus are provided in the "Note" column, in pixels (1 pixel=0.05"). See details in section 3 of the paper. Note (3): The flag "m.edge" denotes an object within 10 pixels of the edge of a Megacam image; ap=(number in arcseconds) represents a smaller aperture used for colors in the cases of blended or edge objects; "m.cut" represents an object cut off in the Megacam image; and "h.edge" refers to an object near the edge of an HST image for which the sky annulus and possibly the object are affected.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 21-May-2012
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