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J/MNRAS/384/1277    Hα emission line sources from IPHAS    (Witham+, 2008)

The IPHAS catalogue of Hα emission-line sources in the northern Galactic plane. Witham A.R., Knigge C., Drew J.E., Greimel R., Steeghs D., Gansicke B.T., Groot P.J., Mampaso A. <Mon. Not. R. Astron. Soc. 384, 1277 (2008)> =2008MNRAS.384.1277W
ADC_Keywords: Stars, emission ; Galactic plane ; Photometry, CCD ; Photometry, H-alpha Keywords: surveys - catalogues - stars: emission-line, Be - Galaxy: stellar content Abstract: We present the first catalogue of point-source Hα emission line objects selected from the INT/WFC Photometric Hα Survey of the Northern Galactic Plane (IPHAS). In total, our catalogue contains 4853 point sources that exhibit strong photometric evidence for Hα emission. The catalogue is a conservative subset of the emitters present in IPHAS and it is likely that there are many more Hα emitters present in the area of the Galactic Plane that IPHAS observes. Our selection criteria are designed to be conservative (rather than complete) in order to avoid a significant number of false positives in the catalogue. In line with this, we find that of the ∼300 catalogue sources for which we have preliminary spectroscopic follow-up observations, more than 95% are confirmed as genuine emission-line sources. Description: We present IPHAS positions and photometry for 4853 sources selected as having a Hα excess from the photometry. The catalogue covers the magnitude range 13≤r'≤19.5mag, and includes sources in the northern hemisphere in the galactic latitude range -5<b<5°. The data from which the catalogue is derived come from IPHAS observations obtained from September 2003 to January 2007 and represents ∼1500deg2 (80%) of the ultimate survey area. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file emitters.dat 87 4853 Positions and photometry for 4853 sources (table2 of the paper)
See also: III/205 : H-alpha Stars in Northern Milky Way (Kohoutek+ 1997) Byte-by-byte Description of file: emitters.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right ascension (J2000.0) 4- 5 I2 min RAm Right ascension (J2000.0) 7- 11 F5.2 s RAs Right ascension (J2000.0) 13 A1 --- DE- Declination sign (J2000.0) 14- 15 I2 deg DEd Declination (J2000.0) 17- 18 I2 arcmin DEm Declination (J2000.0) 20- 23 F4.1 arcsec DEs Declination (J2000.0) 25- 43 A19 --- IPHAS IPHAS source designation, JHHMMSS.ss+DDMMSS.s (1) 45- 50 F6.3 mag r'mag Sloan r' band magnitude 52- 56 F5.3 mag e_r'mag Sloan r' band magnitude error 58- 63 F6.3 mag r'-i' Sloan r'-i' colour index 65- 69 F5.3 mag e_r'-i' Sloan r'-i' colour index error 71- 76 F6.3 mag r'-Ha Sloan r'-Hα colour index 78- 82 F5.3 mag e_r'-Ha Sloan r'-Hα colour index error 84- 87 A4 --- Flag [cksmo ] Photometry/Cross-match flag (2)
Note (1): Sexagesimal, equatorial position-based source name in the form: JHHMMSS.ss+DDMMSS.s. The full naming convention for IPHAS sources has the form "IPHAS JHHMMSS.ss+DDMMSS.s", where "J" indicates the position is J2000. The "IPHAS" prefix is not listed explicitly in the designation column. Note (2): This column is used to flag any special circumstances related to the photometry or if the object is in the vicinity of a Kohoutek & Wehmeyer (1999, Cat. III/205) object. Possible entries in this column are as follows: c = the object does not have consistent magnitudes in any of the IPHAS fields it has been observed in. This can be as a result of source variability or poor photometric calibration due to observations in less than ideal conditions. m = the object is located in a IPHAS field where manual selection of emitters took place. o = the object is located in a IPHAS field where manual selection of emitters took place and additionally the distribution of sources in the r'-i' vs r'-Hα colour-colour plots in this field looked unusual. k = the object has been matched with a previously known Hα emitter in the (Kohoutek & Wehmeyer, 1999, Cat. III/205) catalogue using a matching radius of up to 30arcsec. s = the object has been matched with a SIMBAD source.
Acknowledgements: Andrew Witham, arw_sent(at)yahoo.co.uk
(End) Andrew Witham [Southampton, UK], Patricia Vannier [CDS] 21-Dec-2007
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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