NuSTAR Bringing the High Energy Universe into Focus

 

Completed Legacy Surveys

NuSTAR Legacy Survey observations began after the NuSTAR primary mission was successfully completed in 2015. Legacy surveys are planned to be performed during each 2-year mission extension, although some programs are held over into subsequent extended mission periods.

The Legacy Survey programs completed in the first two extended mission periods (2015-2016 and 2017-2018) are listed below.

Last updated: 2017-10-12


The Extragalactic Survey

There were two survey fields and two AGN samples approved for legacy survey observations in 2015 and 2016 in addition to the continuation of the Swift-BAT AGN survey:

        1) GOODS North  3 tiles centered on J2000 189.2 +62.2 degrees, 4 x 50 ks exposures each tile in 2015 (total 600 ks)

        2) UDS  15 tiles centered on J2000 34.4 -5.2 degrees, 2 x 50 ks each tile in 2016 (total 1500 ks).

        3) A sample of 15 Swift-BAT detected galaxy mergers have been approved for observations coordinated in Chandra GO cycle-17 (2016) (total 300 ks)

ObsID Name J2000 (deg)
RA Dec
60260001  MCG +02-21-013            121.193497   10.7761  
60260002  2MASX J08434495+3549421   130.937454   35.828579
60260003  2MASX J18452628+7211008   281.359314   72.1838  
60260004  1RXS J010713.0-113554      16.807400  -11.600700
60260005  IRAS 03219+4031            51.305100   40.698500
60260006  2MASX J04293830-2109441    67.409500  -21.162200
60260007  1RXS J073308.7+455511    113.288300   45.918400
60260008  Mrk 739E                  174.122000   21.596000
60260009  SDSS J114921.52+532013.4   177.339700   53.337100
60260010  ESO 509-G038    202.807900  -25.402800
60260011  2MASX J16311554+2352577   247.814700   23.882600
60260012  2MASX J01392400+2924067    24.850000   29.401900
60260013  V Zw 232              35.891300   45.818600
60260014  2MASX J04595677+3502536    74.986900   35.048300
60260015  2MASX J10195855-0234363   154.994100   -2.576700
 
Each target was observed for 20 ks within 2 weeks of the Chandra observation.
 
      4)  Longer exposures for a sample of AGN previously observed in Swift-BAT detected AGN sample were added for observations in 2016-2017 (total 370 ks).
 

ObsID

Name

J2000 (deg)

Exposure

RA

Dec

(ks)

60261001

NGC 6300 

259.246674

-62.819721

2 x 20 

60261002

ESO 383-18

203.359589

-34.016308

100 

60261003

3C 105

61.818539

3.70719

2 x 20

60261004

3C 452

341.45459

39.6875

40

60261005

NGC 7319 (Stephan's Quintet) 

339.0149158

33.975858

50

60261006

NGC 7130

327.0813329

-34.9512439

50

60261007

IC 1663

18.52858

-32.650829

50

 

      5)  Swift-BAT detected AGN (20 ks each)

Observations of 117 extragalactic sources taken from the Swift BAT 70-month hard X-ray survey were performed in 2015-2016. Each target was be observed for 20 ks by NuSTAR and 7 ks by Swift-XRT. On average 5 sources were observed each month.

 

6)  Event Horizon Telescope (EHT) multiwavelength campaigns    (total 180 ks)

NuSTAR will join the multiwavelength coordinated observation campaign with the EHT that will probe the innermost regions of accretion flow and jet bases from six nearby active galactic nuclei including the center of the Milky Way. This will offer a unique opportunity to cross-correlate the hard X-ray variability and spectral analysis with structural changes observed by the EHT. The following are the observations completed in April 2018.
 
ObsID Name J2000 (deg) Exposure
RA Dec (ks)
60466001 Sgr A* 266.416837 -29.007811 55 #
60466002 M87 187.705830 12.391110 45 #
60466003 OJ287 (not observed) 133.70365 20.1085 20
60466004 PKS B1055+018 164.623355 1.566340 20 #
60466005 Cen A 201.36506333 -43.0191125 20 #
60466006 Mrk 501 253.46758334 39.7601667 20 #
# Observation Completed
 
 
7)  Dual Swift-BAT detected AGN coordinated with XMM-Newton cycle-16 proposal 080220 (PI Koss) (total 140 ks). - COMPLETED
 
ObsID Name J2000 (deg) Exposure
RA Dec (ks)
60363001 6dF J1254564-265702 193.73480000 -26.95050000 20  *
60363002 AM 0224-283 36.60810000 -28.35030000 20  *
60363003 2MASX J02420381+0510061 40.51580000 5.16840000 20  *
60363004 IRAS 05589+2828 ** 90.5446 28.4717 20
60363005 1RXS J213445.2-272551 323.6875 -27.430872 20  *
60363006 Mrk 248 198.821937 44.407105 20 *
60363008 UGC 06081 165.074965 10.049089 20 *
* Observation Completed
** Not observed by XMM, NuSTAR observetion canceled
 
 
 

The Galactic Survey

There were five survey programs approved for observations in 2015 and 2016, the tables below list the completed programs. Note that some observations have been held over into the 2017-2018 extended mission.

1) Chandra Norma Survey (3 targets, 230 ks total)

ObsID

Name

J2000 (deg)

Exposure

RA

Dec

(ks)

30160001

CXOU J163709.7-473157

249.290590

-47.532603

50

30160002

CXOU J163543.2-473411

248.930065

-47.569853

100

30160003

CXOU J163601.2-474853

249.005345

-47.814953

80

 

2) Unidentified INTEGRAL sources (5 targets, 165 ks total)

ObsID

Name

J2000 (deg)

Exposure

RA

Dec

(ks)

30161001

IGR J20569+4940

314.17808

49.66850

25

30161002

IGR J18293-1213

277.33400

-12.21408

25

30161003

IGR J10447-6027

161.21621

-60.42000

40

30161004

IGR J17402-3656

265.11192

-36.92706

25

30161006

IGR J16181-5407

244.53342

-54.10272

50

 

3) Galactic center survey region (300 ks, 100 ks completed)

ObsID

Name

J2000 (deg)

Exposure

RA

Dec

(ks)

40112001

GCR Block A1

266.21355

-28.769151

100

40112002

GCR Block A2

266.17337

-28.797846

100

40112003

GCR Block B1

265.76099

-29.445483

50

40112004

GCR Block B2

265.84302

-29.467633

50

Observations were completed in 2017.

4) Observations of Sgr A molecular clouds (300 ks) planned for 2017 were postponed due to nearby bright transient sources and are held over into 2018.
 
5) Sgr A* (180 ks) Coordinated with Chandra and Spitzer cycle-18 proposal 18620763 (PI Baganoff, 2 x 24 hour duration observations in the summer of 2017, obsID 30302007) and with Chandra GTO proposal 18620742 (PI Garmire) coordinated with the Event Horizon Telescope in the spring of 2017 (obsID 30302006).
 

ObsID

Name

J2000 (deg)

Exposure

RA

Dec

(ks)

30302006

SgrAstar

266.416837

-29.007811

4 x 20

30302007

SgrAstar

266.416837

-29.007811

2 x 50

 

6) Survey of hard X-ray sources in M33    (3 positions, 200 ks each) 

NuSTAR survey of M33 will be conducted to study the distribution of X-ray binary (XRB) accretion states in an actively star-forming environment, and constrain the 3-40 keV spectrum of the most luminous XRB in the Local Group, M33 X-8. Three 100 ks NuSTAR exposures will be obtained over an area covering ~70% of the star-formation activity within the M33 disk in 2017 and an additional three 100 ks exposures will be obtained in the summer of 2017 coordinated with XMM-Newton cycle-16 observations (proposal 080035, PI Lehmer). Total exposure time 600ks.

The goal is to characterize XRB accretion states for ~15 sources, most of which are expected to be high-mass XRBs (HMXBs). By comparison, the number of visible Milky Way and Magellanic Cloud HMXBs above the luminosity limit of this survey (LX ~ 1037 erg/s) is ~6 (depending on variability). In addition, this data set will contain a factor of 8-15 times more HMXBs than the NuSTAR survey of M31. Taken together, these observations will provide a significant improvement in our knowledge of HMXB accretion states that will prove valuable for theoretical XRB population synthesis studies.

7) Survey of hard X-ray sources in the SMC   (3 positions, 250 ks each)

A NuSTAR survey of three fields in the SMC will be conducted in 2017. Observations of each position will be 150 + 100 ks separated by at least two months to examine variability of sources in each field of view. Total exposure time 750 ks.

 

8) TeV gamma-ray source survey (250 ks) Observations were completed in 2018.

ObsID

Name

J2000 (deg)

Exposure

RA

Dec

(ks)

30362001

HESS J0632+057

98.240

5.810

2 x 50 # *

30362002

2HWC J1928+178

292.178333

17.774167

100  *

30362003

DA 495

298.070

29.430

50  *

* Observation completed
# Coordianted with VERITAS in Nov-Dec 2017
 
 

9) Unidentified INTEGRAL sources (120 ks) Coordinated with observations in Chandra cycle-19 proposal 19400256 (5 ks ACIS-S, PI Tomsick). Observations were completed in 2018.

NuSTAR+Chandra observations aim to determine the nature of >20 keV INTEGRAL sources at low Galactic latitudes. Based on Swift/XRT observations, these three sources are known to have extremely hard spectra (power-law Gamma values between -0.1 and 0.4) and so are good candidates to be HMXBs or CV/IPs. The NuSTAR+Chandra data will be used to confirm that these targets belong to one of these classes. This Legacy program will improve the completeness of classified hard X-ray sources in the Galactic plane, providing a constraint on the low luminosity end of the HMXB population.

 

ObsID

Name

J2000 (deg)

Exposure

RA

Dec

(ks)

30401002

IGR J19498+2534

297.47875

25.5641944

45 *

30401003

IGR J20063+3641

301.5950

36.694306

35 *

30401004

IGR J17528-2022

268.204583

-20.404111

40 *

* Observation completed
 
 

 

10) Sgr A* monitoring (100 ks) Observations were canceled due to Chandra gyro issues.

Chandra and Spitzer for two 24 hour duration observations in the summer of 2018.