Three Type Ia supernovae and a z=2.28 quasar from the PS1 Faint Galaxy Supernova Survey
ATel #4108; M. Fraser, C. Inserra, D. Wright, S. J. Smartt, K. W. Smith, R. Kotak, M. McCrum, L. Magill, T.-W. Chen, D. R. Young (Queens University Belfast), S. Valenti (Osservatorio Astronomico di Padova), F. Bresolin, R. Kudritzki, J. Tonry, E. Magnier, M. Huber, K. Chambers, N. Kaiser, J. Morgan, W. Burgett, J. Heasley, W. Sweeney, C. Waters, H. Flewelling (University of Hawaii), C. Stubbs (Harvard), P. A. Price (Princeton)
on 11 May 2012; 07:48 UT
Credential Certification: Morgan Fraser (mfraser02@qub.ac.uk)
Subjects: Quasar, Supernovae
Further to Valenti et al. (ATels #2668, #3351) we report the independent discovery and spectroscopic confirmation of three SNe and a QSO in the Pan-STARRS1 3Pi Faint Galaxy Supernova Survey.
PS1-12aiv (15:21:48.92 +50:04:21.0) was discovered on MJD 56037.5 at g=18.8, offset by 2.6" from the galaxy SDSS J152149.28+500420.2. On 56052.2, we obtained a low-resolution spectrum of PS1-12aiv with the 4.2m William Herschel Telescope + ACAM + V400 (range 3500-9400A, resolution R~450 at 6000A). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, ApJ, 666, 1024) indicates that PS1-12aiv is a normal Type Ia SN at z=0.09, at +8 days after maximum brightness.
PS1-12ahf (14:22:44.16 +34:15:16.2) was discovered at at i=18.5 on MJD 56031.5, and detected subsequently at r=18.1 on MJD 56040.5. The transient lies within MCG +06-32-011, a late-type galaxy at z=0.06. A spectrum was obtained on MJD 56053.1 with WHT+ACAM; comparison to templates with SNID shows PS1-12ahf to be a Type Ia SN at the redshift of MCG +06-32-011, between 3 and 4 weeks after maximum light.
PS1-12agj (13:52:10.57 +46:28:20.4, also discovered by CRTS (Drake et al. 2009, ApJ, 696, 870) and designated CSS120401:135211+462820) was discovered in the 3Pi FGSS on MJD 56029.5 at r=18.4, i=18.8. A faint (r=21.7) galaxy is seen in SDSS images, offset from the transient by 1.7". A spectrum of PS1-12agj was obtained on MJD 56056.2, with the Telescopio Nazionale Galileo + DOLORES + LRB (range 3000-8430A, R~585). Cross-correlation with SNID indicates that PS1-12agj is a Type Ia SN at z=0.065, approximately 50 days after maximum light.
PS1-12akg (13:24:29.35 +47:43:20.7) was first detected at i=20.1 on MJD 56028.5, rising to i=19.1 on 56049.4. The transient was detected by CRTS as CSS120427:132429+474321, and is also listed in the Milliquas catalog (Flesch 2012, http://quasars.org/milliquas.htm ) as FIRSTJ132429.3+474320. A spectrum of PS1-12akg was obtained with TNG+DOLORES on MJD 56057.2, confirming PS1-12akg as a QSO at z=2.28 with clear Lyman-alpha emission.
The discovery was enabled using the PS1 System operated by the PS1 Science Consortium (PS1SC) and its member institutions, http://www.ps1sc.org/PS1_System_ATel.htm . We thank the PS1 telescope operators for their support of PS1 observations.
