Extended nebulae in IPHAS

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Extended nebulae in IPHAS
Search method, discoveries and perspectives IPHAS
Group-B Laurence Sabin, Romano Corradi,
Robert Greimel Isaac Newton Group of
Telescopes La Palma, Canary Islands Kerttu
Viironen, Antonio Mampaso Instituto de
Astrofisica de Canarias Tenerife, Canary Islands
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Overview

• The targets.
• Search method.
• Status of the analysis.
• General results.
• Specific results for the Group B.
• Problems and open questions.
• Future investigations.

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What are we looking for ?
While Kerttu is looking for compact objects, we
focus on the detection of


EXTENDED NEBULAE
Ionized (PNe,SNR,HII...etc.)
Diameter gt 20 arcsec
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How do we find them ?

• Creation and Visual inspection of 15x15 pixels
  binning mosaics.

?Parameters used to retrieve the mosaics
Size 2x2 deg² Ha-r Sky level lt 600 (in Ha)
Ellipticity lt 0.3 Seeing lt 2 Maglim gt
18 ? 15 pixels Best binning for large and faint
structures.
(Data stored in Cambridge)
Mosaic 194924
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Mosaic 201238
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What is the actual state of the search ?

• 2nd half of the galactic plane completed.

All the extended structures between 18h and 00h
are listed.
4000 detections
Start of the cross-checking ! P. Groot, N.
Wright, R.Greimel and R.Morris (see talk)
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What is the actual state of the search ?(2)

• Further analysis of the region 18h to 20h.

Artefacts detection.

Classification.
IPHAS DATABASE for extended nebulae
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What did we find?
Internet address www.ing.iac.es/ds/IPHAS/Group_B/
Welcome_IPHAS.html
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Nomenclature used in the IPHAS catalogue.
Type

• ? QSO Quasar
• ? Gal Galaxy
• ? HH Herbig-Haro Object
• ? Star -
• ? YSO Young Stellar Object
• ? Symb Symbiotic Star
• ? NA Not available

? DNeb Diffuse nebula i.e. with no defined
form ? RNeb Reflection Nebula ? eStar
Emission line star ? HII HII region ? HII?
HII region candidate ? PN? PN candidate ? PN
Planetary Nebula ? SNR Supernova Remnant

• Main class

R Round I
Irregular B Bipolar
M Multipolar E Elliptical
NA Pending

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What did we find ?
Internet address www.ing.iac.es/ds/IPHAS/Group_B/
Welcome_IPHAS.html
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Catalogue
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What did we find ?
Internet address www.ing.iac.es/ds/IPHAS/Group_
B/Welcome_IPHAS.html
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Search tool
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STATISTICS
Type Known New
Type Known New
TOTAL 217 Known ? 22 621 New
? 63 150 Artefacts ? 15
DNeb 11 271 RNeb 4
3 eStar 4 2 HII 50
0 HII? - 1 PN
53 8 PN? - 159
Star 52 184 SNR 17
0 Sym 2 0 YSO 2
0 Gal 2 1 HH
3 0 QSO 0
0
Only for the 15 pixels binning search !!!
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Group B - Evolved intermediate mass stars and
their nebulae
18h to 20h area
? The nebulae by morphology. ? Follow-up imaging
Follow-up spectroscopy.
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PN candidates spread over a wide
range of geometry
Ring and Round PNe candidates (north on the top
East on the left)
IPHASX J184358.5-023150 ?181''
IPHASXJ184602.8-023309 ?45''
IPHASX J190503.0034234 ?82''
2h10mn exp in H? -INT/WFC
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Ring and Round PNe candidates
IPHASX J192847.2093439 ? 100''
IPHASX J190343.4002657 ?31''
IPHASX J184500.6002125 ?53''
Elliptical PNe candidates
IPHASX J191716.2033451 ?32''
IPHASX J185441.2-015114 ?58''
120s in H? from the IPHAS survey
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Bipolar Multipolar PNe candidates
H? 1h13mn exp INT/WFC
IPHASX J184745.3013249 ?60''
IPHASX J191445.2133216 ?31''
IPHASX J185051.5002129 ?49''
1h exp- INT/WFC
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Irregular nebulae PNe candidates
IPHASX J185312.9002529 ?39''
IPHASX J193740.6203550 ?145''
IPHASX J194533.8210738 ?227''
No obvious symmetry . Larger diameter in average
than the PN? group.
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Newly Confirmed IPHAS-PNe Follow-up
spectroscopy
INT/WFC gt 1h30mn H? INT/IDS gt 30mn R300V
PN
IPHASX J193719.0202107 or GSC 01610-00619
? ?104''
PN
INT/IDS gt 30mn R300V
IPHASX J185051.5002129 ? 49''
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Newly Confirmed IPHAS-PNe Follow-up spectroscopy
(2)
PN
INT/IDS gt 30mn R300V
IPHASX J185051.5002129 ? 49''
PN
San Pedro Martir
DSH J1851.7-0028 IPHASX J185147.5-002825 ?54''
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See Antonio Mampasos talk for the recent
follow-up spectroscopy results !
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Problems encountered

• Detection of intermediate size objects
  ?5-20 need of 5pix binning see Brent
  Miszalski's talk
• Detection of PNe inside HII regions.
• Extended Nebulae are faint (PN?) gt 30mn with the
  INT (2.5m) gt few lines
  
• ?To get deeper spectra gt Apply for more
  efficient and adequate spectrograph (fibers) .
  
  ?For objects identification PN or not
  PN ? gt Continue on same telescopes (with more
  time) !

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Other item to discuss about

• Need more people for the cross-check of the 15pix
  binning mosaics!!!! gt easy way to look for the
  nebulae.

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Future works

• Completion of the database for the 15pix binning
  visual search from RA20h to RA00h.
• Start search for RA00H to RA7h.
• Continue the Follow-up spectroscopy and imaging.
• Edition of the catalogue from RA18h to RA20h.

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In the next area to be investigated...

50 min H? , INT/WFC, IPHASX
J205012.6465517, ?350
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Special Thanks

• Jonathan Irwin for the help with the mosaics
• Robert Greimel for the help with the database