| Canonical Name: | 1ES 1215+303 |
| TeVCat Name: | TeV J1217+301 |
| Other Names: | ON 325, B2 1215+30, VER J1217+301 |
| Source Type: | HBL |
| R.A.: | 12 17 48.5 (hh mm ss) |
| Dec.: | +30 06 06 (dd mm ss) |
| Gal Long: | 189.01 (deg) |
| Gal Lat: | 82.05 (deg) |
| Distance: | z=0.131 |
| Flux: | 0.035 (Crab Units) |
| Energy Threshold: | 250 GeV |
| Spectral Index: | |
| Extended: | No |
| Discovery Date: | 2011-01 |
| Discovered By: | MAGIC |
| TeVCat SubCat: | Default Catalog |
Source Notes:
Source position and its uncertainty:
TeV source position added on 131028; prior to that, the position from
NED was used
From
VERITAS Collaboration (2013):
- R.A. (J2000): 12h 17m 48.5s +/- 1.7s (stat)
- Dec. (J2000): +30d 06' 06" +/- 25"
- Systematic uncertainty: 50"
Distance:
171017: The redshift was updated from z=0.13 to z=0.131
From
Piano et al. 2017:
- "we secured a high quality optical spectrum (SNR approx. 300) in
which we detect two emission lines: [OII] 3727 Angstroms,
[OIII] 5007 Angstroms at z = 0.131 (see also Table 5) confirming
the low redshift previously reported."
Note: in the abstract the redshift is listed as z=0.129; in Table 4
the emission lines are listed as lying at redshift of z=0.129
-
White et al. (2000) give z=0.237
-
Akiyama et al. (2003) give z=0.130
Triggered observations:
- From
ATel 3100: "The MAGIC observations were triggered by
an optical high-state of the source, reported by the
Tuorla blazar
monitoring program".
Spectral Properties:
From
VERITAS Collaboration (2013):
- Spectral index: 3.6 +/- 0.4(stat) +/- 0.3(syst)
From
Aleksic et al. (2012):
- Spectral index: 2.96 +/- 0.14(stat) +/- 0.15(syst)
From
Prokoph et al. (2012):
- Spectral index: 3.6 +/- 0.5
Flux :
From
VERITAS Collaboration (2013):
- during the 2011 season:
- 3.4% of the Crab Nebula flux
- "no evidence for deviation from a steady flux" was found. "No
significant flux variations within any monthly bin were detected
either."
- data available outside the 2011 season (2008/9 and 2012):
- an upper limit was placed on the TeV flux during 2008/9
- during 2012 a flux at the leve of 1.2% of the Crab Nebula flux was
detected
- "The hypothesis of a constant flux between the three seasons is
excluded at the level of 4.5 sigma."
From
Prokoph et al. (2012):
- a flux at the level of about 3% of that of the Crab is reported above 200 GeV
From
Aleksic et al. (2012):
- the flux corresponds to about 3.5% of the Crab Nebula flux
From
Benbow et al. (2011):
- a flux at the level of 1% that of the Crab is reported
From
Mariotti (2011):
- a flux at the level of (2.0 +/- 1.0)% that of the Crab is reported
Classification:
Initially, this source was classified as an LBL in TeVCat. It has been
updated (121113) to a HBL based on its classification in
the
Fermi
2nd AGN Catalog (Ackermann et al. 2012)
Information on the jet:
From
Lister et al. (2019):
- "All three innermost features of this low redshift BL Lac object
(z = 0.131) show small but significant inward motion of approximately
25 micro-as y-1 (0.2 c)."
Seen by: MAGIC, VERITAS
-
A decade of multi-wavelength observations of the TeV blazar 1ES 1215+303: Extreme shift of the synchrotron peak frequency and long-term optical-gamma-ray flux increase
Valverde, Janeth et al., ApJ v891 (2) p170 (2020) [LINK]
-
Nature of gamma-ray variability in blazars
Bhatta, Gopal and Dhital, Niraj, arXiv e-prints parXiv:1911.08198 (2019) [LINK]
-
Long-term Variability Study of the Blazar B2 1215+30 at Gamma-Ray Energies
Noto, G., Valverde J., Horan D., Mukherjee, R. on behalf of the VERITAS and Fermi-LAT Collaborations, 230th AAS Austin, TX, June, 2017 230 p1 (2017) [LINK]
-
Long-term optical monitoring of TeV emitting blazars. I. Data analysis
Nilsson, K. et al., A&A 620 pA185 (2018) [LINK]
-
A luminous and isolated gamma-ray flare from the blazar B2 1215+30
VERITAS Collaboration et al., ArXiv e-prints p (2017) [LINK]
-
On the redshift of TeV BL Lac objects
Paiano, S. et al., ArXiv e-prints p (2017) [LINK]
-
Fermi LAT detection of a GeV gamma-ray flare from the high-energy peaked BL Lac object 1ES 1215+303 (B2 1215+30, ON 325)
Ciprini, S., The Astronomer's Telegram 10270 p1 (2017) [LINK]
-
Temporal analysis of an unprecedented data set for the gamma-ray blazar 1ES 1215+303: Fermi-LAT and VERITAS light curves spanning ten years
Valverde, J. et al., ArXiv e-prints p (2017) [LINK]
-
Observations of low- and intermediate-frequency-peaked BL Lacs above 100 GeV with VERITAS
Errando, M. for the VERITAS Collaboration, ArXiv e-prints p (2013) [LINK]
-
Long term observations of B2 1215+30 with VERITAS
VERITAS collaboration et al., ArXiv e-prints p (2013) [LINK]
-
Discovery of VHE gamma-rays from the blazar 1ES 1215+303 with the MAGIC telescopes and simultaneous multi-wavelength observations
Aleksic, J. et al., A&A 544 pA142 (2012) [LINK]
-
Observations of very high energy emission from B2 1215+30 with VERITAS
Prokoph, H. and for the VERITAS Collaboration, ArXiv e-prints p (2012) [LINK]
-
Discovery of Very High Energy Gamma-Ray Emission from 1ES 1215+303 by MAGIC
Mariotti, M., The Astronomer's Telegram 3100 p1-+ (2011) [LINK]
-
NIR brightening of the Gamma Ray Source 1ES 1215+303
Carrasco, L. et al., The Astronomer's Telegram 3281 p1-+ (2011) [LINK]
-
Rapid optical variability of TeV blazars
Gopal-Krishna et al., ArXiv e-prints p (2011) [LINK]
-
Observation of selected IBLs and LBLs with VERITAS
Majumdar, P. and for the VERITAS Collaboration, ArXiv e-prints p (2011) [LINK]
-
Highlights of the VERITAS Blazar Observation Program
Wystan Benbow for the VERITAS Collaboration, ArXiv e-prints p (2011) [LINK]
-
Observation of the BL Lac objects 1ES 1215+303 and 1ES 1218+304 with the MAGIC telescopes
Colin, P. et al., ArXiv e-prints p (2011) [LINK]
-
MAGIC Telescopes observation of the BL Lac objects 1ES 1215+303 and 1ES 1218+304
Lombardi, S. et al., ArXiv e-prints p (2011) [LINK]
-
Connection Between Optical and VHE Gamma-ray Emission in Blazar Jets
Reinthal, R. et al., ArXiv e-prints p (2011) [LINK]
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