PeterM
01-08-2013, 07:21 AM
Hi all,
Not an Earth shattering one but the BOSS team (Me, Greg Bock, Stu Parker, Colin Drescher, Pat Pearl and Brendan Downs) got another to add to our long list (71 in total now and 4 for July!)
The reason I mention this one even though it is faint is because of the circumstances behind the ATel below.
The SN is in a distant galaxy PGC161935 in Telescopium in the same field as NGC6855. The galaxy is about 782 million light years away (a new BOSS record) think about that distance and the journey the light took.
Anyways by sheer luck when we emailed Siding Springs Observatory at about midnite the astronomers were working on another galaxy within arc minutes of this one so we had a spectra within 2 hours of discovery!
Incredible really.
ATel5239
Classification of PSN J20065788-5625312 as a Type Ia SN near max with WiFeS
ATel #5239; M. Childress, R. Scalzo, F. Yuan, B. Schmidt (Australian National University), B. Tucker (ANU, UC Berkeley)
on 31 Jul 2013; 16:21 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Michael Childress (mjc@mso.anu.edu.au)
Subjects: Optical, Supernovae
We report spectroscopic classification of PSN J20065788-5625312 as a SN Ia near max based on a 40 minute spectrum obtained with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on the ANU 2.3m telescope at Siding Spring Observatory, NSW Australia, using the B3000/R3000 gratings (3500-9800 A, 1 A resolution). PSN J20065788-5625312 was discovered by Peter Marples and Greg Bock on 2013 July 31.51 at 17.4 mag, and our spectrum with WiFeS on 2013 July 31.64 indicates it is a Type Ia around maximum light. Classification with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) shows best match to SN 1994D at -2 days at a redshift of 0.050 +- 0.006, consistent with the redshift of the apparent host galaxy 2MASX J20065644-5625175 (z=0.051946, Jones et al., 2009, MNRAS, 399, 683). Clear SN Ia signatures include Si II 6355 at a rest frame velocity of 12,000 km/s (using host redshift), Si II 5972, the S II "W", O I 7700, Ca H/K, and the Ca II NIR triplet.
Name | RA (J2000) | Dec (J2000) | Disc. Date | Disc. Source | Disc Mag | z | Type | Phase | Notes
PSN J20065788-5625312 | 20 06 57.88 | -56 25 31.2 | 20130731 | Marples, Bock | 17.4 | 0.050 | Ia | -2 |
___________________________________ _____
Not an Earth shattering one but the BOSS team (Me, Greg Bock, Stu Parker, Colin Drescher, Pat Pearl and Brendan Downs) got another to add to our long list (71 in total now and 4 for July!)
The reason I mention this one even though it is faint is because of the circumstances behind the ATel below.
The SN is in a distant galaxy PGC161935 in Telescopium in the same field as NGC6855. The galaxy is about 782 million light years away (a new BOSS record) think about that distance and the journey the light took.
Anyways by sheer luck when we emailed Siding Springs Observatory at about midnite the astronomers were working on another galaxy within arc minutes of this one so we had a spectra within 2 hours of discovery!
Incredible really.
ATel5239
Classification of PSN J20065788-5625312 as a Type Ia SN near max with WiFeS
ATel #5239; M. Childress, R. Scalzo, F. Yuan, B. Schmidt (Australian National University), B. Tucker (ANU, UC Berkeley)
on 31 Jul 2013; 16:21 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Michael Childress (mjc@mso.anu.edu.au)
Subjects: Optical, Supernovae
We report spectroscopic classification of PSN J20065788-5625312 as a SN Ia near max based on a 40 minute spectrum obtained with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on the ANU 2.3m telescope at Siding Spring Observatory, NSW Australia, using the B3000/R3000 gratings (3500-9800 A, 1 A resolution). PSN J20065788-5625312 was discovered by Peter Marples and Greg Bock on 2013 July 31.51 at 17.4 mag, and our spectrum with WiFeS on 2013 July 31.64 indicates it is a Type Ia around maximum light. Classification with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) shows best match to SN 1994D at -2 days at a redshift of 0.050 +- 0.006, consistent with the redshift of the apparent host galaxy 2MASX J20065644-5625175 (z=0.051946, Jones et al., 2009, MNRAS, 399, 683). Clear SN Ia signatures include Si II 6355 at a rest frame velocity of 12,000 km/s (using host redshift), Si II 5972, the S II "W", O I 7700, Ca H/K, and the Ca II NIR triplet.
Name | RA (J2000) | Dec (J2000) | Disc. Date | Disc. Source | Disc Mag | z | Type | Phase | Notes
PSN J20065788-5625312 | 20 06 57.88 | -56 25 31.2 | 20130731 | Marples, Bock | 17.4 | 0.050 | Ia | -2 |
___________________________________ _____