Search of Compact Planetary Nebulae from the IPHAS data

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Search of Compact Planetary Nebulae from the
IPHAS data

• Kerttu Viironen
• IAC

Collaboration A. Mampaso (IAC)
R. Corradi, R. Greimel, L. Sabin (ING)
E. Rodríguez-Flores (IGA)
IPHAS collaboration
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Overview

• 1) IPHAS and Planetary Nebulae
• 2) Searching for compact PNe
• 3) Ongoing work

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IPHAS and the Planetary Nebulae
Shiode et al. 2006
Acker et al. 1992

• Several hundreds of new PNe expected to be found
  by IPHAS
• - About 2000 PNe already known in the Galaxy
• Important to find new ones because

- the only well studied PNe are nearby and bright
? our knowledge of PNe biased

• There exist a lot of different subtypes of PNe
• Peimberts Types I to IV (chemical composition
  and galactic distribution)
• Morphology R, E, B, Q, PS
• Evolution proto-PNe ? evolved PNe
• ? a good sample of each kind needed

- Especially there is a lack of PN detections in
the Galactic plane

• PNe detections missing in galactic halo and
  anti-center regions

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IPHAS and the Planetary Nebulae

• Search techniques
• photometric catalogue (r-H? colors) ?
  compact/small nebulae
• 2. visual inspection of mosaics ? medium/large
  nebulae (Laurences and Brents talks!)

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Searching compact PNe
E(B-V)?
main sequence
giants
Synthetic photometry constructed using Pickles
(1998) library of flux-calibrated stellar spectra
r-H?
supergiants
r-i
Drew et al. 2005
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Searching compact PNe
Known PNe in IPHAS two-color diagram
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Searching compact PNe

• The selection script
• Discards objects too close to the borders of the
  CCDs,
• the vignetted corner of CCD 3, or the areas of
  bad pixels
• Filters out the objects classified as noise or
  saturated
• Filters out objects which do not appear in all
  three filters
• Filters out objects for which matching between
  different filters
• is worse than 0.65 arcsec
• - Makes cuts in r - H?

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Searching compact PNe
The final selection is made visually, to remove
false alarms...
like HII region condensations...
partially resolved stars...
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Searching compact PNe
emission from nearby bright stars/moon...
satellite crossing through the H? image...
and weird reflection effects
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Searching compact PNe
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Searching compact PNe
IPHAS X052531.2281946 anticentre Dgc14-20 kpc!
Viironen et al., in preparation
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Searching compact PNe
The first study (2003 data)
47.5 million catalogued objects
? selection script
? 39751 objects
? cuts in r - H? (r - H? ? 2.0 or
1.5 ? r - H? ? 2.0 and m(H?) ? 17 mag)
? 934 objects
? visual checking
? 44 PN candidates
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Searching compact PNe
Known PN
Confirmed IPHAS PN Candidate IPHAS PN
H? IPHAS star
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Searching compact PNe
2MASS two-color diagram in PN search

• 2MASS
• -An all sky infrared survey
• Three filters J (1.25 ?m),
• H (1.65 ?m), Ks (2.17 ?m)
• -Limiting magnitude
• 1mJy

Known PN
Confirmed IPHAS PN Candidate IPHAS PN
H? IPHAS star
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Ongoing work

• - Finish the PN search for all IPHAS data
• - Extend the PN search to objects visible only in
  H? and r, but not in i
• Publish the coordinates of the PN candidates (the
  webpage!)
• Spectroscopic follow up (already started see
  Antonios talk!)

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Ongoing work
IPHAS diagram (data until September 2005)
3.1 million candidates!
1.4 million 2MASS matches (inside one arcsec)
The known PNe
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Ongoing work
2MASS diagram
The known PNe
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Thank You!
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